{"gene":"AHI1","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":2002,"finding":"AHI1 encodes a modular protein containing one SH3 domain and seven WD40 repeats, and was identified as a gene targeted by provirus insertional mutations in Abelson pre-B-cell lymphomas. Proviral insertions at the 3' end of the gene produced truncated Ahi-1/viral fused transcripts, including splicing variants with deletion of the SH3 domain, implicating it in signal transduction.","method":"cDNA cloning, Northern blot, provirus integration site mapping, transcript analysis","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular cloning and characterization with multiple methods (Northern blot, cDNA analysis, domain identification) in a single lab","pmids":["12186888"],"is_preprint":false},{"year":2004,"finding":"AHI1 is most highly expressed in neurons that give rise to the crossing axons of the corticospinal tract and superior cerebellar peduncles, and loss-of-function mutations cause Joubert syndrome with abnormal axonal decussation and cerebellar malformation.","method":"Human genetics (mutation identification), in situ hybridization/expression analysis","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — first gene identification for Joubert syndrome, replicated across multiple subsequent studies","pmids":["15322546"],"is_preprint":false},{"year":2004,"finding":"AHI1 (encoding Jouberin) contains WD40 repeats, an SH3 domain, and numerous SH3-binding sites, and is expressed strongly in embryonic hindbrain and forebrain, indicating roles in cerebellar and cortical development. Frameshift and missense mutations cause Joubert syndrome with cortical polymicrogyria.","method":"Mutation identification by sequencing, expression analysis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain structure confirmed by sequence analysis, human genetic validation, single lab","pmids":["15467982"],"is_preprint":false},{"year":2008,"finding":"Ahi1 protein localizes to the mother centriole (basal body of the primary cilium). Knockdown of Ahi1 by shRNAi or targeted Ahi1 deletion impairs ciliogenesis. In Ahi1-knockdown cells, Rab8a (a small GTPase critical for polarized membrane trafficking) is destabilized and fails to localize properly to the basal body, causing defects in endocytic vesicle trafficking from the plasma membrane to the Golgi and back.","method":"shRNAi knockdown, Ahi1 knockout mouse, immunofluorescence/localization, vesicle trafficking assays, ciliogenesis assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (KO mouse, shRNAi, localization, functional trafficking assays) establishing Ahi1-Rab8a regulatory relationship","pmids":["19625297"],"is_preprint":false},{"year":2008,"finding":"Mouse Ahi1 forms a stable protein complex with huntingtin-associated protein 1 (Hap1). Hap1-knockout mice show significantly reduced Ahi1 levels, defective cerebellar development, and abnormal axonal decussation. Suppression of Ahi1 also decreases Hap1 levels. Truncated Ahi1 (corresponding to Joubert syndrome mutations) inhibits neurite outgrowth in neuronal culture. The Ahi1-Hap1 complex regulates TrkB receptor internalization and signaling (reducing TrkB-mediated neurogenesis/differentiation).","method":"Co-immunoprecipitation, Hap1-KO mouse analysis, Ahi1 suppression, neurite outgrowth assay, TrkB signaling measurement","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal complex formation confirmed, KO phenotype with mechanistic follow-up (TrkB signaling), multiple orthogonal methods","pmids":["18636121"],"is_preprint":false},{"year":2008,"finding":"Murine Ahi1 is distributed throughout the cytoplasm, dendrites, and axons of neurons but is absent from glial cells. Ahi1 protein consistently accumulates in the stigmoid body, a cytoplasmic organelle found in neurons.","method":"Immunohistochemistry, comparative expression analysis (human, mouse, zebrafish), subcellular localization","journal":"The Journal of comparative neurology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — localization established across multiple species with orthologous proteins, replicated pattern but no direct functional consequence established for stigmoid body localization","pmids":["18785627"],"is_preprint":false},{"year":2008,"finding":"AHI-1 overexpression in murine and human hematopoietic cells confers growth advantages in vitro and induces leukemia in vivo, enhancing BCR-ABL effects. AHI-1, BCR-ABL, and JAK2 form a physical interaction complex. Modulation of AHI-1 expression regulates phosphorylation of BCR-ABL and JAK2-STAT5. RNAi-mediated suppression of AHI-1 in CML stem/progenitor cells reduces growth autonomy. This complex mediates tyrosine kinase inhibitor (TKI) resistance.","method":"Co-immunoprecipitation (AHI-1-BCR-ABL-JAK2 complex), RNAi knockdown, overexpression in hematopoietic cells, in vivo leukemia induction, phosphorylation assays","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP for complex identification, functional knockdown and overexpression with mechanistic phosphorylation readout, in vivo validation","pmids":["18936234"],"is_preprint":false},{"year":2009,"finding":"Knockdown of AHI-1 in CTCL cells identifies HCK (tyrosine kinase) and BIN1 (tumor suppressor) as downstream effectors. Changes in HCK phosphorylation were observed upon AHI-1 suppression or overexpression. BIN1 physically interacts with MYC in CTCL cells. AHI-1 suppression alters autocrine cytokine production (IL-2, IL-4, TNFα).","method":"Retroviral RNAi knockdown, microarray, qRT-PCR, Western blot, co-immunoprecipitation (BIN1-MYC)","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP for BIN1-MYC interaction; HCK phosphorylation changes observed; replicated in primary patient cells but single lab","pmids":["19211505"],"is_preprint":false},{"year":2010,"finding":"Ahi1-null mice fail to form retinal photoreceptor outer segments and have abnormal distribution of opsin throughout photoreceptors. Photoreceptor apoptosis occurs rapidly between 2-4 weeks of age. This phenotype shows dosage-sensitive genetic interaction with Nphp1 (another ciliopathy gene), and reducing opsin dosage significantly delays cell death.","method":"Ahi1 knockout mouse, histology, immunostaining, opsin localization, genetic epistasis (Ahi1/Nphp1 double mutant)","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with clear phenotypic readout, genetic epistasis with Nphp1, dosage rescue experiment, replicated in concurrent study (PMID:20592197)","pmids":["20081859"],"is_preprint":false},{"year":2010,"finding":"In Ahi1-/- mice, photoreceptor outer segment proteins (transducin, Rom1) fail to be transported appropriately or are significantly reduced, while synaptic proteins are correctly trafficked. Vesicular targeting defects are cilium-specific. Rab8a expression is decreased in Ahi1-/- mice, suggesting Ahi1 stabilizes Rab8a to mediate polarized vesicular trafficking to the outer segment.","method":"Ahi1 knockout mouse, immunostaining for synaptic vs. outer segment proteins, electron microscopy, Rab8a expression analysis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse with specific ciliary vs. non-ciliary trafficking distinction, multiple proteins analyzed, Rab8a mechanism established","pmids":["20592197"],"is_preprint":false},{"year":2010,"finding":"Neuronal-specific Ahi1 deficiency (Cre-loxP) reduces TrkB levels in the brain and causes depressive phenotypes. Ahi1 deficiency promotes degradation of endocytic TrkB and reduces TrkB signaling in neuronal cells. Overexpression of TrkB in the amygdala rescues depressive phenotypes.","method":"Conditional Cre-loxP KO, TrkB level and signaling measurement, endocytic TrkB degradation assay, viral TrkB overexpression rescue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with pathway-specific rescue (TrkB overexpression), mechanistic degradation assay, multiple orthogonal methods","pmids":["20956301"],"is_preprint":false},{"year":2011,"finding":"In zebrafish ahi1 morphants, knockdown causes loss of cilia at Kupffer's vesicle and subsequently defects in cardiac left-right asymmetry. siRNA knockdown in renal epithelial cells demonstrates a role for Ahi1 in both ciliogenesis and cell-cell junction formation.","method":"Zebrafish morpholino knockdown, whole-mount immunostaining, siRNA in renal epithelial cells, cilia assessment","journal":"Cellular and molecular life sciences : CMLS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function in two model systems (zebrafish and cell culture) with defined ciliary and junction phenotypes, single lab","pmids":["21959375"],"is_preprint":false},{"year":2011,"finding":"Hypothalamic Ahi1 interacts with serotonin receptor 2C (5-HT2CR) and promotes its degradation via the lysosomal pathway. Knockdown of hypothalamic Ahi1 increases 5-HT2CR expression and decreases food intake and body weight. Ahi1 regulates neuropeptide Y and POMC expression downstream of this interaction.","method":"Co-immunoprecipitation, co-localization, lysosomal inhibitor assays, Ahi1 knockdown (hypothalamic injection), feeding behavior measurement","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing physical interaction, lysosomal degradation mechanism, functional knockdown with behavioral readout, single lab","pmids":["22123816"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of the AHI-1 SH3 domain resolved at 1.53-Å resolution reveals canonical SH3 folding with an unusual C-terminal α-helix. Deletion of the SH3 domain significantly enhances apoptotic response of BCR-ABL+ cells to TKIs. A novel interaction between AHI-1 and Dynamin-2 (a GTPase) was identified through the SH3 domain. PD1R peptide modeling suggests an 'Arg-Arg-Trp' stack forms within the binding interface.","method":"X-ray crystallography (1.53 Å), SH3 domain deletion mutagenesis, co-immunoprecipitation (AHI-1/Dynamin-2), apoptosis assay","journal":"Proteomics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure plus functional mutagenesis (domain deletion) plus novel binding partner identification by Co-IP, single lab with multiple orthogonal methods","pmids":["22623184"],"is_preprint":false},{"year":2013,"finding":"Full-length (but not N-terminal) Ahi1 binds Hap1, and this interaction is regulated by nerve growth factor: NGF induces dephosphorylation of Hap1A and decreases its association with Ahi1. Ahi1 associates with phosphorylated Hap1A in cytosolic but not synaptosomal fractions. Mass spectrometry of cytosolic Ahi1 immunoprecipitates identifies Cend1 (BM88) as a binding partner. Loss of Ahi1 reduces Cend1 levels in the hypothalamus; overexpressed Ahi1 stabilizes Cend1; and Cend1 overexpression rescues neurite extension defects in Ahi1-KO hypothalamic neurons.","method":"Co-immunoprecipitation, mass spectrometry, Western blot (subcellular fractionation), NGF treatment, Ahi1-KO mouse, rescue by Cend1 overexpression","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1 / Strong — MS identification of binding partner confirmed by Co-IP, KO mouse, rescue experiment with mechanistic pathway defined","pmids":["23658157"],"is_preprint":false},{"year":2013,"finding":"The Joubert syndrome-associated AHI1 missense mutation V443D (in a region with no known protein motifs) reduces AHI1 stability by 50%, causes aberrant localization of AHI1 at basal bodies and cell-cell junctions, and decreases AHI1 binding to NPHP1. Another JBTS-causing mutation, R351L, shows similar mislocalization. Primary cilia formation is decreased in fibroblasts from individuals with JBTS and AHI1 mutations. HAP1 has decreased binding to AHI1-V443D, but Hap1-deficient fibroblasts and neurons form primary cilia normally, indicating Hap1-Ahi1 binding is not critical for ciliary function.","method":"Transfection of mutant constructs, immunofluorescence localization, Co-immunoprecipitation (AHI1-NPHP1, AHI1-HAP1), protein stability assays, ciliogenesis assay in patient fibroblasts, Hap1-KO analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mutations characterized, reciprocal binding assays, patient fibroblasts used, mechanistic distinction between NPHP1 and HAP1 interactions established","pmids":["23532844"],"is_preprint":false},{"year":2014,"finding":"Cby1 promotes Ahi1 recruitment to a ring-shaped domain (~250 nm) at the distal end of mature centrioles (centriole-cilium interface), as revealed by superresolution microscopy (3D-SIM and STED). The amount of centriole-localized Ahi1 (but not Ofd1) is reduced in Cby1-/- cells, indicating Cby1 is required for efficient recruitment of Ahi1 to the transition zone.","method":"Superresolution microscopy (3D-SIM, STED), Cby1 knockout mouse cells, immunostaining","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — superresolution structural localization combined with KO genetic perturbation establishing Cby1 as upstream recruiter of Ahi1","pmids":["25103236"],"is_preprint":false},{"year":2015,"finding":"C-terminal truncations of AHI1 (p.Arg1066* and p.Trp1088Leufs*16) are non-pathogenic when homozygous in humans — carriers do not manifest Joubert syndrome. Morpholinos against N-terminal zebrafish Ahi1 (orthologous to where human mutations cluster) produced ciliopathy phenotype, but targeting near the human C-terminal truncation sites did not, establishing that the C-terminal SH3 domain is dispensable for normal development and that pathogenicity requires disruption of N-terminal WD40-repeat-containing regions.","method":"Whole-exome sequencing, homozygosity mapping, zebrafish morpholino (N-terminal vs. C-terminal targeting), clinical phenotyping","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics combined with zebrafish morpholino epistasis distinguishing functional vs. dispensable domains; mechanistically informative negative result rigorously established","pmids":["25616960"],"is_preprint":false},{"year":2017,"finding":"AHI1 missense variants in the WD40 domain cause non-syndromic retinitis pigmentosa. Expression of mutant recombinant Jouberin in ciliated RPE cells shows significantly decreased enrichment at the ciliary base, without changes in overall ciliation percentage, cilium length, or IFT. 3D structure homology modeling predicts structural implications of WD40-domain missense variants.","method":"Exome sequencing, 3D homology modeling, patient fibroblast ciliogenesis assay, recombinant protein expression in ciliated RPE cells, immunofluorescence localization","journal":"Journal of medical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional validation of localization defect in ciliated cells using recombinant mutant proteins, structural modeling, single lab","pmids":["28442542"],"is_preprint":false},{"year":2017,"finding":"Zebrafish ahi1lri46 (TALEN-generated) mutants develop shorter cone outer segments but normal rod morphology at 5 dpf; by 5 months, cone degeneration and rhodopsin mislocalization in rods occurs. The connecting cilium forms normally and Cc2d2a and Cep290 localize properly, indicating Ahi1 is required for disc morphogenesis and outer segment maintenance but not for basic connecting cilium formation.","method":"TALEN-generated zebrafish mutant, histology, electron microscopy, immunohistochemistry, optokinetic response assay","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic null mutant with defined photoreceptor phenotype and negative localization results for transition zone proteins, single lab","pmids":["28118669"],"is_preprint":false},{"year":2018,"finding":"AHI1 loss in Ahi1-KO mice downregulates tyrosine hydroxylase (TH) in the midbrain. Rev-Erbα (a TH transcriptional repressor) and BMAL1 (Rev-Erbα transcriptional regulator) are upregulated in Ahi1-KO midbrains. AHI1 decreases BMAL1/Rev-Erbα expression by interacting with and repressing RORα (a nuclear receptor and circadian gene transcriptional regulator). Bmal1 deficiency reverses TH reduction caused by Ahi1 deficiency. Rev-Erbα inhibitor microinfusion into ventral midbrain of Ahi1-KO mice increases TH and improves depressive symptoms.","method":"Ahi1-KO mouse, Western blot, Ahi1-knockdown cells, co-immunoprecipitation (AHI1-RORα), genetic epistasis (Ahi1 KO x Bmal1 KO), pharmacological rescue (SR8278)","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing AHI1-RORα interaction, genetic epistasis, pharmacological rescue; multiple methods in single lab","pmids":["29449373"],"is_preprint":false},{"year":2019,"finding":"Deletion of Ahi1 in mouse embryonic fibroblasts (MEFs) reduces localization of Arl13b to the ciliary membrane (without changing total or membrane-associated Arl13b levels), decreases non-membrane-associated Arl13b stability via the proteasome pathway, decreases sonic hedgehog signaling, and causes abnormally elongated ciliary axoneme with increased ciliary IFT88. Ahi1-/- MEFs display defects in cell motility and Pdgfr-α-dependent migration. Exogenous Ahi1-GFP restores ciliary length, Arl13b ciliary recruitment, and Arl13b stability.","method":"Ahi1 KO MEFs, immunofluorescence, Smo/Gli signaling assay, proteasome inhibitor assay, exogenous rescue (Ahi1-GFP), cell migration/motility assay","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO with rescue, multiple mechanistic readouts (Arl13b stability via proteasome, Shh signaling, IFT, cell migration), single lab with orthogonal methods","pmids":["31391239"],"is_preprint":false},{"year":2019,"finding":"AHI1 physically interacts with APP (amyloid precursor protein) in mouse brain and transfected cells. AHI1 expression facilitates intracellular translocation of APP and inhibits APP amyloidogenic processing, reducing APP-CTFβ and secreted Aβ42. AHI1 is reduced in AD model cells (expressing Swedish/Indiana APP) and in 3xTg-AD mouse brain. AHI1-APP interaction enhances Erk activation and restores cell survival and differentiation.","method":"Co-immunoprecipitation (AHI1-APP), Western blot (CTFβ, Aβ42), AHI1 overexpression in AD model cells, Ahi1-KD cells, Erk signaling assay","journal":"Molecular neurobiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing physical interaction, functional overexpression with mechanistic readout (APP processing), single lab","pmids":["31062249"],"is_preprint":false},{"year":2019,"finding":"Mutant Ahi1 lacking intact WD40 repeats (generated by morpholino or CRISPR/Cas9 truncation in zebrafish) causes retinal ganglion cell axon misprojection and ocular dysplasia, whereas ahi1 null zebrafish show normal RGC axon projection and ocular morphology, demonstrating that the aberrant retinal axon projection phenotype is caused by a toxic gain-of-function of truncated Ahi1 rather than loss of Ahi1.","method":"Zebrafish morpholino (generating truncated Ahi1), CRISPR/Cas9 truncation, ahi1 null zebrafish comparison, in situ hybridization, RGC axon projection analysis","journal":"Frontiers in cellular neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent genetic methods (morpholino truncation and CRISPR/Cas9) plus null comparison establishing gain-of-function mechanism","pmids":["30949029"],"is_preprint":false},{"year":2021,"finding":"Ahi1 regulates the nuclear translocation of glucocorticoid receptor (GR): stress-mediated GR nuclear translocation reduces Ahi1 in stressed cells and mouse brains. Ahi1 interacts with GR to stabilize each other in the cytoplasm. Ahi1 deficiency promotes GR degradation in the cytoplasm and reduces GR nuclear translocation in response to stress. Ahi1-KO mice show hyposensitivity to antidepressants under stress.","method":"Co-immunoprecipitation (Ahi1-GR), Western blot, Ahi1-KO mouse, nuclear/cytoplasmic fractionation, antidepressant treatment","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing Ahi1-GR interaction, KO mouse with mechanistic readout (GR localization and stability), single lab","pmids":["33782379"],"is_preprint":false},{"year":2021,"finding":"AHI1 regulates neuronal ciliary trafficking of melanin-concentrating hormone receptor 1 (MCHR1): loss of Ahi1 in mouse neurons significantly reduces MCHR1 in the ciliary membrane without affecting total or surface MCHR1 expression. Ahi1-/- neurons show decreased cAMP and ERK signaling upon MCH stimulation, demonstrating that ciliary localization of MCHR1 is necessary for its downstream signaling.","method":"Ahi1-/- neuronal culture, immunofluorescence (ciliary vs. total MchR1), cAMP assay, ERK phosphorylation assay, MCH stimulation","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO neuronal culture, specific ciliary trafficking versus surface expression distinction, two downstream signaling readouts, mechanistic pathway established","pmids":["33741721"],"is_preprint":false},{"year":2021,"finding":"Chronic stress induces abnormal nuclear translocation of Tet2. Ahi1 physically interacts with Tet2 (identified by Tet2 immunoprecipitation and mass spectrometry). Ahi1 knockout or knockdown causes accumulation of Tet2 in the cytosol. Reduction of Ahi1 protein under chronic stress explains Ahi1-dependent Tet2 nuclear translocation defects.","method":"Co-immunoprecipitation, mass spectrometry (Tet2 IP), Ahi1-KO mouse, siRNA knockdown, nuclear/cytoplasmic fractionation, 5hmC profiling","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification of Ahi1-Tet2 interaction confirmed by Co-IP, KO mouse with localization readout, single lab","pmids":["34218273"],"is_preprint":false},{"year":2022,"finding":"AHI1 acts as a critical stabilizer of basal type-I interferon (IFN-I) signaling. Mechanistically, AHI1 recruits OTUD1 (a deubiquitinase) to deubiquitinate and stabilize Tyk2. AHI1 reduction (induced by depression-related AVP/arginine vasopressin) downregulates Tyk2 and IFN-I signaling activity in macrophages. AVP reduces AHI1 in macrophages, leading to attenuated antiviral immune response.","method":"Co-immunoprecipitation (AHI1-OTUD1-Tyk2 complex), ubiquitination assays, AHI1 knockdown/KO, IFN-I signaling measurement, patient PBMCs, depression model mice","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP identifying complex, deubiquitination mechanism, patient-derived cells plus mouse model, multiple orthogonal methods in single lab","pmids":["35821088"],"is_preprint":false},{"year":2022,"finding":"Ahi1 regulates serotonin production via the GR/ERβ/TPH2 pathway: GR acts as a transcription factor that binds to the ERβ promoter glucocorticoid response elements and inhibits ERβ transcription. Ahi1 regulates GR nuclear translocation (established in prior work), thereby modulating the ERβ/TPH2 serotonin synthesis pathway. Brain E2 (17β-estradiol) levels decrease in male but not female Ahi1-KO mice, explaining sex differences in depressive behavior.","method":"Western blot, gene knockdown, dual-luciferase reporter assay (GR binding to ERβ promoter), immunofluorescence, rescue assay (ERβ agonist), Ahi1-KO mouse, E2 measurement","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter directly establishing GR-ERβ promoter binding, KO mouse with sex-specific E2 measurement, pharmacological rescue; single lab","pmids":["35643536"],"is_preprint":false},{"year":2023,"finding":"Mitochondrial Ahi1 and GR form a complex that, together with TFAM, regulates mtDNA copy number and brain ATP levels by binding to the D-loop control region of mitochondrial DNA. Loss of mitochondrial Ahi1/GR increases mtDNA copy numbers and decreases ATP levels. Regular exercise increases mitochondrial Ahi1/GR levels and improves depressive behavior in stressed but not Ahi1-KO mice.","method":"Co-immunoprecipitation (Ahi1/GR), ChIP-qPCR (GR binding to D-loop), Western blot (mitochondrial fractions), Ahi1-KO mouse, mtDNA copy number assay, ATP measurement","journal":"Cell communication and signaling : CCS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-qPCR establishing GR binding to mtDNA D-loop in Ahi1-dependent manner, Co-IP complex identification, KO mouse, single lab","pmids":["36691038"],"is_preprint":false},{"year":2025,"finding":"In CEP290-null photoreceptors, AHI1 (normally a transition zone protein) is abnormally restricted to the proximal connecting cilium rather than distributed throughout the transition zone, indicating that CEP290 is required for proper spatial distribution of AHI1 within the connecting cilium.","method":"CEP290-null mouse retina, advanced microscopy (super-resolution), immunostaining for transition zone proteins","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single study, localization observation in KO context without functional rescue or mechanistic follow-up for the AHI1-specific finding","pmids":["bio_10.1101_2025.01.20.633784"],"is_preprint":true}],"current_model":"AHI1 (Jouberin) is a scaffolding/adaptor protein that localizes to the transition zone (mother centriole/basal body) of primary cilia, where it regulates ciliogenesis and ciliary cargo trafficking (including Rab8a-dependent polarized vesicular transport, Arl13b ciliary membrane localization and stability, and MCHR1 ciliary targeting for downstream GPCR signaling); in neurons it forms a stable complex with HAP1 to regulate TrkB endocytic sorting and signaling, interacts with GR to control its cytoplasmic stability and nuclear translocation under stress, recruits OTUD1 to deubiquitinate and stabilize Tyk2 for basal IFN-I antiviral signaling, and in leukemia cells forms an AHI-1/BCR-ABL/JAK2 complex (via its SH3 domain, whose crystal structure is resolved) that modulates JAK2-STAT5 phosphorylation and tyrosine kinase inhibitor resistance."},"narrative":{"mechanistic_narrative":"AHI1 (Jouberin) is a modular SH3- and WD40-repeat scaffolding/adaptor protein that operates at the primary cilium transition zone and in neuronal cytoplasmic signaling, with loss-of-function mutations causing Joubert syndrome featuring cerebellar malformation and abnormal axonal decussation [PMID:15322546, PMID:15467982]. At the ciliary base, AHI1 localizes to the mother centriole/basal body, where its recruitment to a ring-shaped transition-zone domain depends on Cby1, and where it is required for ciliogenesis and polarized vesicular trafficking by stabilizing the small GTPase Rab8a [PMID:19625297, PMID:25103236]. AHI1 governs ciliary cargo: it sustains Arl13b ciliary membrane localization and proteasomal stability to support Sonic hedgehog signaling and proper axoneme length, mediates outer-segment protein transport in photoreceptors, and targets the GPCRs MCHR1 to the ciliary membrane for downstream cAMP/ERK signaling [PMID:20592197, PMID:31391239, PMID:33741721]. Its WD40 region binds NPHP1, and Joubert/retinitis pigmentosa mutations in this region destabilize AHI1 and impair its ciliary-base enrichment, whereas the C-terminal SH3 domain is dispensable for normal development [PMID:23532844, PMID:25616960, PMID:28442542]. In neurons AHI1 forms a stable complex with HAP1 that regulates TrkB receptor endocytic sorting and signaling, and AHI1 controls additional partners including 5-HT2CR, Cend1, GR, and APP to influence neurite outgrowth, feeding behavior, and stress-related/depressive phenotypes [PMID:18636121, PMID:20956301, PMID:22123816, PMID:23658157, PMID:31062249, PMID:33782379]. Beyond ciliary and neuronal roles, AHI1 has hematopoietic and immune functions: an AHI-1/BCR-ABL/JAK2 complex assembled via its SH3 domain modulates JAK2-STAT5 phosphorylation and tyrosine kinase inhibitor resistance in leukemia, and AHI1 recruits the deubiquitinase OTUD1 to stabilize Tyk2 and maintain basal type-I interferon signaling [PMID:18936234, PMID:22623184, PMID:35821088].","teleology":[{"year":2002,"claim":"Established AHI1's molecular architecture and first link to signal transduction by identifying it as a provirus-targeted gene encoding an SH3/WD40 modular protein.","evidence":"cDNA cloning and provirus integration mapping in Abelson pre-B-cell lymphomas","pmids":["12186888"],"confidence":"Medium","gaps":["No direct binding partners or substrates defined","Functional consequence of truncation not yet shown"]},{"year":2004,"claim":"Defined AHI1 as the causative gene for Joubert syndrome, connecting its loss to cerebellar malformation and abnormal axonal decussation and anchoring its developmental role.","evidence":"Human mutation identification with brain expression analysis","pmids":["15322546","15467982"],"confidence":"High","gaps":["Molecular mechanism of axon guidance defect unresolved","Cellular pathway connecting mutations to phenotype not yet defined"]},{"year":2008,"claim":"Placed AHI1 at the ciliary basal body and established its requirement for ciliogenesis via Rab8a stabilization and polarized vesicle trafficking.","evidence":"shRNAi knockdown, knockout mouse, immunolocalization and trafficking assays","pmids":["19625297"],"confidence":"High","gaps":["Direct biochemical interaction with Rab8a not demonstrated","How AHI1 stabilizes Rab8a mechanistically unknown"]},{"year":2008,"claim":"Identified a stable AHI1-HAP1 complex that regulates TrkB receptor internalization and signaling, linking AHI1 to neuronal differentiation distinct from its ciliary role.","evidence":"Reciprocal Co-IP, HAP1-KO mouse, neurite outgrowth and TrkB signaling assays","pmids":["18636121"],"confidence":"High","gaps":["Binding interface within AHI1 not mapped","Relationship between HAP1 complex and ciliary function unclear"]},{"year":2008,"claim":"Revealed an oncogenic role through an AHI-1/BCR-ABL/JAK2 complex modulating JAK2-STAT5 phosphorylation and TKI resistance in leukemia.","evidence":"Co-IP, RNAi/overexpression in hematopoietic cells, in vivo leukemia induction, phosphorylation assays","pmids":["18936234"],"confidence":"High","gaps":["Which AHI1 domain mediates complex assembly not yet resolved here","Whether interactions are direct unconfirmed"]},{"year":2009,"claim":"Extended AHI-1 signaling in lymphoma by linking it to HCK kinase and BIN1 effectors and autocrine cytokine production.","evidence":"Retroviral RNAi, microarray, Western blot and single Co-IP (BIN1-MYC) in CTCL cells","pmids":["19211505"],"confidence":"Medium","gaps":["BIN1-MYC interaction rests on a single Co-IP","Direct vs indirect link of AHI-1 to HCK not established"]},{"year":2010,"claim":"Demonstrated cilium-specific cargo trafficking by showing AHI1 is needed for photoreceptor outer segment formation and selective outer-segment protein transport, again via Rab8a.","evidence":"KO mouse histology, opsin/transducin/Rom1 localization, Nphp1 genetic epistasis and opsin dosage rescue","pmids":["20081859","20592197"],"confidence":"High","gaps":["Direct AHI1-Rab8a biochemistry still inferred","Selectivity mechanism for ciliary versus synaptic cargo unknown"]},{"year":2010,"claim":"Connected neuronal AHI1 loss to TrkB degradation and depressive phenotypes, establishing a behaviorally relevant TrkB-signaling axis.","evidence":"Conditional Cre-loxP KO, endocytic TrkB degradation assay, viral TrkB rescue in amygdala","pmids":["20956301"],"confidence":"High","gaps":["Whether TrkB regulation requires HAP1 complex not addressed","Mechanism of endocytic sorting unresolved"]},{"year":2011,"claim":"Generalized the ciliary requirement across systems and added a cell-cell junction role using zebrafish and renal epithelial loss-of-function.","evidence":"Zebrafish morpholino, siRNA in renal cells, cilia and junction assessment","pmids":["21959375"],"confidence":"Medium","gaps":["Junction-formation mechanism undefined","Morpholino specificity concerns inherent to method"]},{"year":2011,"claim":"Identified AHI1 as a regulator of 5-HT2CR lysosomal degradation in the hypothalamus, linking it to feeding behavior and body weight.","evidence":"Co-IP, co-localization, lysosomal inhibitor assays, hypothalamic knockdown, feeding measurement","pmids":["22123816"],"confidence":"Medium","gaps":["Direct binding site not mapped","Single-lab finding without reciprocal validation"]},{"year":2012,"claim":"Resolved the AHI-1 SH3 domain crystal structure and showed its deletion sensitizes BCR-ABL+ cells to TKIs, identifying Dynamin-2 as an SH3 partner.","evidence":"X-ray crystallography (1.53 Å), SH3 deletion mutagenesis, Co-IP, apoptosis assay","pmids":["22623184"],"confidence":"High","gaps":["Functional role of Dynamin-2 interaction not explored","Structure of WD40 region unresolved"]},{"year":2013,"claim":"Mapped binding determinants and partners (NGF-regulated HAP1A, Cend1) and clarified that JBTS mutations destabilize AHI1 and disrupt NPHP1 binding while HAP1 binding is dispensable for ciliogenesis.","evidence":"Co-IP, mass spectrometry, mutant constructs, protein stability and ciliogenesis assays in patient fibroblasts, Cend1 rescue","pmids":["23658157","23532844"],"confidence":"High","gaps":["How NPHP1 binding supports ciliary localization mechanistically unknown","Structural basis of mutation effects on WD40 fold not solved"]},{"year":2014,"claim":"Identified Cby1 as the upstream factor recruiting AHI1 to a defined transition-zone ring at the centriole-cilium interface.","evidence":"Superresolution microscopy (3D-SIM, STED) and Cby1-KO cells","pmids":["25103236"],"confidence":"High","gaps":["Direct Cby1-AHI1 interaction not biochemically confirmed","Functional consequence of mislocalized AHI1 in Cby1-KO not measured"]},{"year":2015,"claim":"Distinguished functional from dispensable domains, showing C-terminal SH3 truncations are non-pathogenic and pathogenicity requires N-terminal WD40 disruption.","evidence":"Whole-exome sequencing, homozygosity mapping, zebrafish morpholino N- vs C-terminal targeting","pmids":["25616960"],"confidence":"High","gaps":["Precise WD40 functional motifs not delineated","Reconciliation with SH3's role in leukemia not addressed"]},{"year":2017,"claim":"Linked WD40-domain missense variants to non-syndromic retinitis pigmentosa via reduced ciliary-base enrichment of Jouberin.","evidence":"Exome sequencing, homology modeling, recombinant mutant expression in ciliated RPE cells","pmids":["28442542"],"confidence":"Medium","gaps":["Mechanism of base enrichment loss undefined","Single-lab functional assay"]},{"year":2017,"claim":"Refined the photoreceptor phenotype, showing Ahi1 is required for outer-segment disc morphogenesis and maintenance but not basic connecting cilium formation.","evidence":"TALEN zebrafish mutant, histology, EM, transition-zone protein localization","pmids":["28118669"],"confidence":"Medium","gaps":["Molecular cargo defect underlying disc phenotype unresolved","Species-specific differences not reconciled"]},{"year":2019,"claim":"Established AHI1's control of Arl13b ciliary localization/stability and downstream Shh signaling, axoneme length, and PDGFR-α-dependent cell migration.","evidence":"Ahi1-KO MEFs with Ahi1-GFP rescue, proteasome inhibition, Smo/Gli and migration assays","pmids":["31391239"],"confidence":"High","gaps":["Whether AHI1 directly binds Arl13b not shown","Link between Arl13b stabilization and Rab8a pathway unclear"]},{"year":2019,"claim":"Resolved a long-standing question by showing the retinal axon misprojection phenotype reflects a toxic gain-of-function of truncated Ahi1 rather than loss of function.","evidence":"Zebrafish morpholino/CRISPR truncation versus null comparison, RGC axon analysis","pmids":["30949029"],"confidence":"High","gaps":["Molecular basis of toxic gain-of-function undefined","Relevance to human Joubert axon phenotype not directly tested"]},{"year":2019,"claim":"Identified an APP-binding role for AHI1 that inhibits amyloidogenic processing and enhances ERK-dependent survival, linking AHI1 to Alzheimer-relevant biology.","evidence":"Co-IP, Western blot for CTFβ/Aβ42, overexpression and knockdown in AD model cells","pmids":["31062249"],"confidence":"Medium","gaps":["Direct vs indirect AHI1-APP interaction not resolved","In vivo relevance to disease progression untested"]},{"year":2021,"claim":"Expanded AHI1's GPCR-trafficking role to ciliary targeting of MCHR1, demonstrating ciliary localization is required for downstream cAMP/ERK signaling.","evidence":"Ahi1-/- neuronal culture, ciliary vs surface MCHR1 immunofluorescence, cAMP and ERK assays","pmids":["33741721"],"confidence":"High","gaps":["Mechanism of selective ciliary targeting unknown","Whether AHI1 directly binds MCHR1 not established"]},{"year":2021,"claim":"Defined AHI1 as a cytoplasmic stabilizer and translocation regulator of the glucocorticoid receptor under stress, with behavioral antidepressant consequences.","evidence":"Co-IP, Ahi1-KO mouse, nuclear/cytoplasmic fractionation, antidepressant treatment","pmids":["33782379"],"confidence":"Medium","gaps":["Direct binding interface not mapped","Single-lab finding"]},{"year":2021,"claim":"Identified Tet2 as an AHI1 partner whose stress-induced nuclear translocation depends on AHI1, linking AHI1 to epigenetic regulation.","evidence":"Tet2 IP mass spectrometry, Co-IP, Ahi1-KO/knockdown, fractionation, 5hmC profiling","pmids":["34218273"],"confidence":"Medium","gaps":["Functional outcome of altered Tet2 localization on gene expression incompletely defined","Single-lab finding"]},{"year":2022,"claim":"Established AHI1 as a stabilizer of basal type-I interferon signaling by recruiting OTUD1 to deubiquitinate and stabilize Tyk2, connecting it to antiviral immunity.","evidence":"Co-IP of AHI1-OTUD1-Tyk2 complex, ubiquitination assays, knockdown/KO, patient PBMCs and depression model mice","pmids":["35821088"],"confidence":"High","gaps":["Domain of AHI1 mediating OTUD1/Tyk2 recruitment not mapped","Relationship to other JAK-family roles unexplored"]},{"year":2022,"claim":"Extended the GR axis to serotonin synthesis via GR/ERβ/TPH2 regulation and explained sex differences in depressive behavior through E2 levels.","evidence":"Dual-luciferase reporter of GR-ERβ promoter binding, knockdown, Ahi1-KO mouse, ERβ agonist rescue, E2 measurement","pmids":["35643536"],"confidence":"Medium","gaps":["Mechanism of sex-specific E2 effect undefined","Single-lab finding"]},{"year":2023,"claim":"Revealed a mitochondrial AHI1/GR complex that, with TFAM, regulates mtDNA copy number and brain ATP via D-loop binding, linking AHI1 to bioenergetics and exercise responses.","evidence":"Co-IP, ChIP-qPCR of GR binding to mtDNA D-loop, mitochondrial fractionation, Ahi1-KO mouse, mtDNA/ATP assays","pmids":["36691038"],"confidence":"Medium","gaps":["How AHI1 reaches mitochondria not defined","Single-lab finding"]},{"year":2025,"claim":"Showed CEP290 is required for proper spatial distribution of AHI1 within the connecting cilium, placing AHI1 downstream of CEP290 in transition-zone organization.","evidence":"CEP290-null mouse retina with super-resolution immunostaining (preprint)","pmids":["bio_10.1101_2025.01.20.633784"],"confidence":"Low","gaps":["Preprint, single observational study without functional rescue","AHI1-CEP290 biochemical relationship not tested"]},{"year":null,"claim":"How a single scaffold reconciles its transition-zone ciliary cargo functions with its diverse cytoplasmic, mitochondrial, immune, and oncogenic partner interactions remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unified domain-mapping across AHI1's many partners","Whether ciliary and non-ciliary roles share a common biochemical activity is unknown","No high-resolution structure of the WD40 region"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,6,13,27]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,9,21,24]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[3,16,30]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[3,21,25]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,14,24]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[29]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[24,26]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3,9,21,25]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,6,21,25]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,2,8]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[27]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[21,27]}],"complexes":["AHI-1/BCR-ABL/JAK2 complex","AHI1-HAP1 complex","AHI1-OTUD1-Tyk2 complex"],"partners":["HAP1","NPHP1","RAB8A","ARL13B","BCR-ABL","JAK2","OTUD1","GR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N157","full_name":"Jouberin","aliases":["Abelson helper integration site 1 protein homolog","AHI-1"],"length_aa":1196,"mass_kda":137.1,"function":"Involved in vesicle trafficking and required for ciliogenesis, formation of primary non-motile cilium, and recruitment of RAB8A to the basal body of primary cilium. Component of the tectonic-like complex, a complex localized at the transition zone of primary cilia and acting as a barrier that prevents diffusion of transmembrane proteins between the cilia and plasma membranes. Involved in neuronal differentiation. As a positive modulator of classical Wnt signaling, may play a crucial role in ciliary signaling during cerebellum embryonic development (PubMed:21623382)","subcellular_location":"Cytoplasm, cytoskeleton, cilium basal body; Cell junction, adherens junction; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole","url":"https://www.uniprot.org/uniprotkb/Q8N157/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AHI1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AHI1","total_profiled":1310},"omim":[{"mim_id":"614950","title":"TRANSMEMBRANE PROTEIN 17; TMEM17","url":"https://www.omim.org/entry/614950"},{"mim_id":"614949","title":"TRANSMEMBRANE PROTEIN 231; TMEM231","url":"https://www.omim.org/entry/614949"},{"mim_id":"614144","title":"B9 DOMAIN-CONTAINING PROTEIN 1; B9D1","url":"https://www.omim.org/entry/614144"},{"mim_id":"613421","title":"POTASSIUM CHANNEL TETRAMERIZATION DOMAIN-CONTAINING PROTEIN 10; KCTD10","url":"https://www.omim.org/entry/613421"},{"mim_id":"612013","title":"COILED-COIL AND C2 DOMAINS-CONTAINING PROTEIN 2A; CC2D2A","url":"https://www.omim.org/entry/612013"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Centrosome","reliability":"Supported"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/30695685","citation_count":8,"is_preprint":false},{"pmid":"34191236","id":"PMC_34191236","title":"Identification of a novel truncating variant in AHI1 gene and a brief review on mutations spectrum.","date":"2021","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/34191236","citation_count":6,"is_preprint":false},{"pmid":"31786207","id":"PMC_31786207","title":"Reduction of AHI1 in the serum of Taiwanese with probable Alzheimer's disease.","date":"2019","source":"Clinical biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/31786207","citation_count":5,"is_preprint":false},{"pmid":"29379820","id":"PMC_29379820","title":"MS AHI1 genetic risk promotes IFNγ+ CD4+ T cells.","date":"2017","source":"Neurology(R) neuroimmunology & neuroinflammation","url":"https://pubmed.ncbi.nlm.nih.gov/29379820","citation_count":5,"is_preprint":false},{"pmid":"27585752","id":"PMC_27585752","title":"A cis-eQTL in AHI1 confers risk to 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of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/31938409","citation_count":4,"is_preprint":false},{"pmid":"19191019","id":"PMC_19191019","title":"Cloning and characterization of the promoter of the human AHI1 gene.","date":"2009","source":"Biochemical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/19191019","citation_count":3,"is_preprint":false},{"pmid":"36521382","id":"PMC_36521382","title":"Generation of an iPSC line from skin fibroblasts of a patient with Joubert syndrome carrying the homozygous loss of function variant c.787dupC in the AHI1 gene.","date":"2022","source":"Stem cell research","url":"https://pubmed.ncbi.nlm.nih.gov/36521382","citation_count":2,"is_preprint":false},{"pmid":"19342780","id":"PMC_19342780","title":"Expression, purification, crystallization and preliminary X-ray crystallographic analysis of the SH3 domain of human AHI1.","date":"2009","source":"Acta crystallographica. 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Proviral insertions at the 3' end of the gene produced truncated Ahi-1/viral fused transcripts, including splicing variants with deletion of the SH3 domain, implicating it in signal transduction.\",\n      \"method\": \"cDNA cloning, Northern blot, provirus integration site mapping, transcript analysis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular cloning and characterization with multiple methods (Northern blot, cDNA analysis, domain identification) in a single lab\",\n      \"pmids\": [\"12186888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AHI1 is most highly expressed in neurons that give rise to the crossing axons of the corticospinal tract and superior cerebellar peduncles, and loss-of-function mutations cause Joubert syndrome with abnormal axonal decussation and cerebellar malformation.\",\n      \"method\": \"Human genetics (mutation identification), in situ hybridization/expression analysis\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — first gene identification for Joubert syndrome, replicated across multiple subsequent studies\",\n      \"pmids\": [\"15322546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"AHI1 (encoding Jouberin) contains WD40 repeats, an SH3 domain, and numerous SH3-binding sites, and is expressed strongly in embryonic hindbrain and forebrain, indicating roles in cerebellar and cortical development. Frameshift and missense mutations cause Joubert syndrome with cortical polymicrogyria.\",\n      \"method\": \"Mutation identification by sequencing, expression analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain structure confirmed by sequence analysis, human genetic validation, single lab\",\n      \"pmids\": [\"15467982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ahi1 protein localizes to the mother centriole (basal body of the primary cilium). Knockdown of Ahi1 by shRNAi or targeted Ahi1 deletion impairs ciliogenesis. In Ahi1-knockdown cells, Rab8a (a small GTPase critical for polarized membrane trafficking) is destabilized and fails to localize properly to the basal body, causing defects in endocytic vesicle trafficking from the plasma membrane to the Golgi and back.\",\n      \"method\": \"shRNAi knockdown, Ahi1 knockout mouse, immunofluorescence/localization, vesicle trafficking assays, ciliogenesis assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (KO mouse, shRNAi, localization, functional trafficking assays) establishing Ahi1-Rab8a regulatory relationship\",\n      \"pmids\": [\"19625297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Mouse Ahi1 forms a stable protein complex with huntingtin-associated protein 1 (Hap1). Hap1-knockout mice show significantly reduced Ahi1 levels, defective cerebellar development, and abnormal axonal decussation. Suppression of Ahi1 also decreases Hap1 levels. Truncated Ahi1 (corresponding to Joubert syndrome mutations) inhibits neurite outgrowth in neuronal culture. The Ahi1-Hap1 complex regulates TrkB receptor internalization and signaling (reducing TrkB-mediated neurogenesis/differentiation).\",\n      \"method\": \"Co-immunoprecipitation, Hap1-KO mouse analysis, Ahi1 suppression, neurite outgrowth assay, TrkB signaling measurement\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal complex formation confirmed, KO phenotype with mechanistic follow-up (TrkB signaling), multiple orthogonal methods\",\n      \"pmids\": [\"18636121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Murine Ahi1 is distributed throughout the cytoplasm, dendrites, and axons of neurons but is absent from glial cells. Ahi1 protein consistently accumulates in the stigmoid body, a cytoplasmic organelle found in neurons.\",\n      \"method\": \"Immunohistochemistry, comparative expression analysis (human, mouse, zebrafish), subcellular localization\",\n      \"journal\": \"The Journal of comparative neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — localization established across multiple species with orthologous proteins, replicated pattern but no direct functional consequence established for stigmoid body localization\",\n      \"pmids\": [\"18785627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"AHI-1 overexpression in murine and human hematopoietic cells confers growth advantages in vitro and induces leukemia in vivo, enhancing BCR-ABL effects. AHI-1, BCR-ABL, and JAK2 form a physical interaction complex. Modulation of AHI-1 expression regulates phosphorylation of BCR-ABL and JAK2-STAT5. RNAi-mediated suppression of AHI-1 in CML stem/progenitor cells reduces growth autonomy. This complex mediates tyrosine kinase inhibitor (TKI) resistance.\",\n      \"method\": \"Co-immunoprecipitation (AHI-1-BCR-ABL-JAK2 complex), RNAi knockdown, overexpression in hematopoietic cells, in vivo leukemia induction, phosphorylation assays\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP for complex identification, functional knockdown and overexpression with mechanistic phosphorylation readout, in vivo validation\",\n      \"pmids\": [\"18936234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Knockdown of AHI-1 in CTCL cells identifies HCK (tyrosine kinase) and BIN1 (tumor suppressor) as downstream effectors. Changes in HCK phosphorylation were observed upon AHI-1 suppression or overexpression. BIN1 physically interacts with MYC in CTCL cells. AHI-1 suppression alters autocrine cytokine production (IL-2, IL-4, TNFα).\",\n      \"method\": \"Retroviral RNAi knockdown, microarray, qRT-PCR, Western blot, co-immunoprecipitation (BIN1-MYC)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP for BIN1-MYC interaction; HCK phosphorylation changes observed; replicated in primary patient cells but single lab\",\n      \"pmids\": [\"19211505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Ahi1-null mice fail to form retinal photoreceptor outer segments and have abnormal distribution of opsin throughout photoreceptors. Photoreceptor apoptosis occurs rapidly between 2-4 weeks of age. This phenotype shows dosage-sensitive genetic interaction with Nphp1 (another ciliopathy gene), and reducing opsin dosage significantly delays cell death.\",\n      \"method\": \"Ahi1 knockout mouse, histology, immunostaining, opsin localization, genetic epistasis (Ahi1/Nphp1 double mutant)\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with clear phenotypic readout, genetic epistasis with Nphp1, dosage rescue experiment, replicated in concurrent study (PMID:20592197)\",\n      \"pmids\": [\"20081859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Ahi1-/- mice, photoreceptor outer segment proteins (transducin, Rom1) fail to be transported appropriately or are significantly reduced, while synaptic proteins are correctly trafficked. Vesicular targeting defects are cilium-specific. Rab8a expression is decreased in Ahi1-/- mice, suggesting Ahi1 stabilizes Rab8a to mediate polarized vesicular trafficking to the outer segment.\",\n      \"method\": \"Ahi1 knockout mouse, immunostaining for synaptic vs. outer segment proteins, electron microscopy, Rab8a expression analysis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse with specific ciliary vs. non-ciliary trafficking distinction, multiple proteins analyzed, Rab8a mechanism established\",\n      \"pmids\": [\"20592197\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Neuronal-specific Ahi1 deficiency (Cre-loxP) reduces TrkB levels in the brain and causes depressive phenotypes. Ahi1 deficiency promotes degradation of endocytic TrkB and reduces TrkB signaling in neuronal cells. Overexpression of TrkB in the amygdala rescues depressive phenotypes.\",\n      \"method\": \"Conditional Cre-loxP KO, TrkB level and signaling measurement, endocytic TrkB degradation assay, viral TrkB overexpression rescue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with pathway-specific rescue (TrkB overexpression), mechanistic degradation assay, multiple orthogonal methods\",\n      \"pmids\": [\"20956301\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In zebrafish ahi1 morphants, knockdown causes loss of cilia at Kupffer's vesicle and subsequently defects in cardiac left-right asymmetry. siRNA knockdown in renal epithelial cells demonstrates a role for Ahi1 in both ciliogenesis and cell-cell junction formation.\",\n      \"method\": \"Zebrafish morpholino knockdown, whole-mount immunostaining, siRNA in renal epithelial cells, cilia assessment\",\n      \"journal\": \"Cellular and molecular life sciences : CMLS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function in two model systems (zebrafish and cell culture) with defined ciliary and junction phenotypes, single lab\",\n      \"pmids\": [\"21959375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Hypothalamic Ahi1 interacts with serotonin receptor 2C (5-HT2CR) and promotes its degradation via the lysosomal pathway. Knockdown of hypothalamic Ahi1 increases 5-HT2CR expression and decreases food intake and body weight. Ahi1 regulates neuropeptide Y and POMC expression downstream of this interaction.\",\n      \"method\": \"Co-immunoprecipitation, co-localization, lysosomal inhibitor assays, Ahi1 knockdown (hypothalamic injection), feeding behavior measurement\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing physical interaction, lysosomal degradation mechanism, functional knockdown with behavioral readout, single lab\",\n      \"pmids\": [\"22123816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the AHI-1 SH3 domain resolved at 1.53-Å resolution reveals canonical SH3 folding with an unusual C-terminal α-helix. Deletion of the SH3 domain significantly enhances apoptotic response of BCR-ABL+ cells to TKIs. A novel interaction between AHI-1 and Dynamin-2 (a GTPase) was identified through the SH3 domain. PD1R peptide modeling suggests an 'Arg-Arg-Trp' stack forms within the binding interface.\",\n      \"method\": \"X-ray crystallography (1.53 Å), SH3 domain deletion mutagenesis, co-immunoprecipitation (AHI-1/Dynamin-2), apoptosis assay\",\n      \"journal\": \"Proteomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus functional mutagenesis (domain deletion) plus novel binding partner identification by Co-IP, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22623184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Full-length (but not N-terminal) Ahi1 binds Hap1, and this interaction is regulated by nerve growth factor: NGF induces dephosphorylation of Hap1A and decreases its association with Ahi1. Ahi1 associates with phosphorylated Hap1A in cytosolic but not synaptosomal fractions. Mass spectrometry of cytosolic Ahi1 immunoprecipitates identifies Cend1 (BM88) as a binding partner. Loss of Ahi1 reduces Cend1 levels in the hypothalamus; overexpressed Ahi1 stabilizes Cend1; and Cend1 overexpression rescues neurite extension defects in Ahi1-KO hypothalamic neurons.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, Western blot (subcellular fractionation), NGF treatment, Ahi1-KO mouse, rescue by Cend1 overexpression\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — MS identification of binding partner confirmed by Co-IP, KO mouse, rescue experiment with mechanistic pathway defined\",\n      \"pmids\": [\"23658157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The Joubert syndrome-associated AHI1 missense mutation V443D (in a region with no known protein motifs) reduces AHI1 stability by 50%, causes aberrant localization of AHI1 at basal bodies and cell-cell junctions, and decreases AHI1 binding to NPHP1. Another JBTS-causing mutation, R351L, shows similar mislocalization. Primary cilia formation is decreased in fibroblasts from individuals with JBTS and AHI1 mutations. HAP1 has decreased binding to AHI1-V443D, but Hap1-deficient fibroblasts and neurons form primary cilia normally, indicating Hap1-Ahi1 binding is not critical for ciliary function.\",\n      \"method\": \"Transfection of mutant constructs, immunofluorescence localization, Co-immunoprecipitation (AHI1-NPHP1, AHI1-HAP1), protein stability assays, ciliogenesis assay in patient fibroblasts, Hap1-KO analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mutations characterized, reciprocal binding assays, patient fibroblasts used, mechanistic distinction between NPHP1 and HAP1 interactions established\",\n      \"pmids\": [\"23532844\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cby1 promotes Ahi1 recruitment to a ring-shaped domain (~250 nm) at the distal end of mature centrioles (centriole-cilium interface), as revealed by superresolution microscopy (3D-SIM and STED). The amount of centriole-localized Ahi1 (but not Ofd1) is reduced in Cby1-/- cells, indicating Cby1 is required for efficient recruitment of Ahi1 to the transition zone.\",\n      \"method\": \"Superresolution microscopy (3D-SIM, STED), Cby1 knockout mouse cells, immunostaining\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — superresolution structural localization combined with KO genetic perturbation establishing Cby1 as upstream recruiter of Ahi1\",\n      \"pmids\": [\"25103236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"C-terminal truncations of AHI1 (p.Arg1066* and p.Trp1088Leufs*16) are non-pathogenic when homozygous in humans — carriers do not manifest Joubert syndrome. Morpholinos against N-terminal zebrafish Ahi1 (orthologous to where human mutations cluster) produced ciliopathy phenotype, but targeting near the human C-terminal truncation sites did not, establishing that the C-terminal SH3 domain is dispensable for normal development and that pathogenicity requires disruption of N-terminal WD40-repeat-containing regions.\",\n      \"method\": \"Whole-exome sequencing, homozygosity mapping, zebrafish morpholino (N-terminal vs. C-terminal targeting), clinical phenotyping\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics combined with zebrafish morpholino epistasis distinguishing functional vs. dispensable domains; mechanistically informative negative result rigorously established\",\n      \"pmids\": [\"25616960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"AHI1 missense variants in the WD40 domain cause non-syndromic retinitis pigmentosa. Expression of mutant recombinant Jouberin in ciliated RPE cells shows significantly decreased enrichment at the ciliary base, without changes in overall ciliation percentage, cilium length, or IFT. 3D structure homology modeling predicts structural implications of WD40-domain missense variants.\",\n      \"method\": \"Exome sequencing, 3D homology modeling, patient fibroblast ciliogenesis assay, recombinant protein expression in ciliated RPE cells, immunofluorescence localization\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional validation of localization defect in ciliated cells using recombinant mutant proteins, structural modeling, single lab\",\n      \"pmids\": [\"28442542\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Zebrafish ahi1lri46 (TALEN-generated) mutants develop shorter cone outer segments but normal rod morphology at 5 dpf; by 5 months, cone degeneration and rhodopsin mislocalization in rods occurs. The connecting cilium forms normally and Cc2d2a and Cep290 localize properly, indicating Ahi1 is required for disc morphogenesis and outer segment maintenance but not for basic connecting cilium formation.\",\n      \"method\": \"TALEN-generated zebrafish mutant, histology, electron microscopy, immunohistochemistry, optokinetic response assay\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic null mutant with defined photoreceptor phenotype and negative localization results for transition zone proteins, single lab\",\n      \"pmids\": [\"28118669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"AHI1 loss in Ahi1-KO mice downregulates tyrosine hydroxylase (TH) in the midbrain. Rev-Erbα (a TH transcriptional repressor) and BMAL1 (Rev-Erbα transcriptional regulator) are upregulated in Ahi1-KO midbrains. AHI1 decreases BMAL1/Rev-Erbα expression by interacting with and repressing RORα (a nuclear receptor and circadian gene transcriptional regulator). Bmal1 deficiency reverses TH reduction caused by Ahi1 deficiency. Rev-Erbα inhibitor microinfusion into ventral midbrain of Ahi1-KO mice increases TH and improves depressive symptoms.\",\n      \"method\": \"Ahi1-KO mouse, Western blot, Ahi1-knockdown cells, co-immunoprecipitation (AHI1-RORα), genetic epistasis (Ahi1 KO x Bmal1 KO), pharmacological rescue (SR8278)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing AHI1-RORα interaction, genetic epistasis, pharmacological rescue; multiple methods in single lab\",\n      \"pmids\": [\"29449373\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Deletion of Ahi1 in mouse embryonic fibroblasts (MEFs) reduces localization of Arl13b to the ciliary membrane (without changing total or membrane-associated Arl13b levels), decreases non-membrane-associated Arl13b stability via the proteasome pathway, decreases sonic hedgehog signaling, and causes abnormally elongated ciliary axoneme with increased ciliary IFT88. Ahi1-/- MEFs display defects in cell motility and Pdgfr-α-dependent migration. Exogenous Ahi1-GFP restores ciliary length, Arl13b ciliary recruitment, and Arl13b stability.\",\n      \"method\": \"Ahi1 KO MEFs, immunofluorescence, Smo/Gli signaling assay, proteasome inhibitor assay, exogenous rescue (Ahi1-GFP), cell migration/motility assay\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO with rescue, multiple mechanistic readouts (Arl13b stability via proteasome, Shh signaling, IFT, cell migration), single lab with orthogonal methods\",\n      \"pmids\": [\"31391239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AHI1 physically interacts with APP (amyloid precursor protein) in mouse brain and transfected cells. AHI1 expression facilitates intracellular translocation of APP and inhibits APP amyloidogenic processing, reducing APP-CTFβ and secreted Aβ42. AHI1 is reduced in AD model cells (expressing Swedish/Indiana APP) and in 3xTg-AD mouse brain. AHI1-APP interaction enhances Erk activation and restores cell survival and differentiation.\",\n      \"method\": \"Co-immunoprecipitation (AHI1-APP), Western blot (CTFβ, Aβ42), AHI1 overexpression in AD model cells, Ahi1-KD cells, Erk signaling assay\",\n      \"journal\": \"Molecular neurobiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing physical interaction, functional overexpression with mechanistic readout (APP processing), single lab\",\n      \"pmids\": [\"31062249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mutant Ahi1 lacking intact WD40 repeats (generated by morpholino or CRISPR/Cas9 truncation in zebrafish) causes retinal ganglion cell axon misprojection and ocular dysplasia, whereas ahi1 null zebrafish show normal RGC axon projection and ocular morphology, demonstrating that the aberrant retinal axon projection phenotype is caused by a toxic gain-of-function of truncated Ahi1 rather than loss of Ahi1.\",\n      \"method\": \"Zebrafish morpholino (generating truncated Ahi1), CRISPR/Cas9 truncation, ahi1 null zebrafish comparison, in situ hybridization, RGC axon projection analysis\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent genetic methods (morpholino truncation and CRISPR/Cas9) plus null comparison establishing gain-of-function mechanism\",\n      \"pmids\": [\"30949029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Ahi1 regulates the nuclear translocation of glucocorticoid receptor (GR): stress-mediated GR nuclear translocation reduces Ahi1 in stressed cells and mouse brains. Ahi1 interacts with GR to stabilize each other in the cytoplasm. Ahi1 deficiency promotes GR degradation in the cytoplasm and reduces GR nuclear translocation in response to stress. Ahi1-KO mice show hyposensitivity to antidepressants under stress.\",\n      \"method\": \"Co-immunoprecipitation (Ahi1-GR), Western blot, Ahi1-KO mouse, nuclear/cytoplasmic fractionation, antidepressant treatment\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing Ahi1-GR interaction, KO mouse with mechanistic readout (GR localization and stability), single lab\",\n      \"pmids\": [\"33782379\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AHI1 regulates neuronal ciliary trafficking of melanin-concentrating hormone receptor 1 (MCHR1): loss of Ahi1 in mouse neurons significantly reduces MCHR1 in the ciliary membrane without affecting total or surface MCHR1 expression. Ahi1-/- neurons show decreased cAMP and ERK signaling upon MCH stimulation, demonstrating that ciliary localization of MCHR1 is necessary for its downstream signaling.\",\n      \"method\": \"Ahi1-/- neuronal culture, immunofluorescence (ciliary vs. total MchR1), cAMP assay, ERK phosphorylation assay, MCH stimulation\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO neuronal culture, specific ciliary trafficking versus surface expression distinction, two downstream signaling readouts, mechanistic pathway established\",\n      \"pmids\": [\"33741721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Chronic stress induces abnormal nuclear translocation of Tet2. Ahi1 physically interacts with Tet2 (identified by Tet2 immunoprecipitation and mass spectrometry). Ahi1 knockout or knockdown causes accumulation of Tet2 in the cytosol. Reduction of Ahi1 protein under chronic stress explains Ahi1-dependent Tet2 nuclear translocation defects.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry (Tet2 IP), Ahi1-KO mouse, siRNA knockdown, nuclear/cytoplasmic fractionation, 5hmC profiling\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification of Ahi1-Tet2 interaction confirmed by Co-IP, KO mouse with localization readout, single lab\",\n      \"pmids\": [\"34218273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AHI1 acts as a critical stabilizer of basal type-I interferon (IFN-I) signaling. Mechanistically, AHI1 recruits OTUD1 (a deubiquitinase) to deubiquitinate and stabilize Tyk2. AHI1 reduction (induced by depression-related AVP/arginine vasopressin) downregulates Tyk2 and IFN-I signaling activity in macrophages. AVP reduces AHI1 in macrophages, leading to attenuated antiviral immune response.\",\n      \"method\": \"Co-immunoprecipitation (AHI1-OTUD1-Tyk2 complex), ubiquitination assays, AHI1 knockdown/KO, IFN-I signaling measurement, patient PBMCs, depression model mice\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP identifying complex, deubiquitination mechanism, patient-derived cells plus mouse model, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"35821088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Ahi1 regulates serotonin production via the GR/ERβ/TPH2 pathway: GR acts as a transcription factor that binds to the ERβ promoter glucocorticoid response elements and inhibits ERβ transcription. Ahi1 regulates GR nuclear translocation (established in prior work), thereby modulating the ERβ/TPH2 serotonin synthesis pathway. Brain E2 (17β-estradiol) levels decrease in male but not female Ahi1-KO mice, explaining sex differences in depressive behavior.\",\n      \"method\": \"Western blot, gene knockdown, dual-luciferase reporter assay (GR binding to ERβ promoter), immunofluorescence, rescue assay (ERβ agonist), Ahi1-KO mouse, E2 measurement\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter directly establishing GR-ERβ promoter binding, KO mouse with sex-specific E2 measurement, pharmacological rescue; single lab\",\n      \"pmids\": [\"35643536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mitochondrial Ahi1 and GR form a complex that, together with TFAM, regulates mtDNA copy number and brain ATP levels by binding to the D-loop control region of mitochondrial DNA. Loss of mitochondrial Ahi1/GR increases mtDNA copy numbers and decreases ATP levels. Regular exercise increases mitochondrial Ahi1/GR levels and improves depressive behavior in stressed but not Ahi1-KO mice.\",\n      \"method\": \"Co-immunoprecipitation (Ahi1/GR), ChIP-qPCR (GR binding to D-loop), Western blot (mitochondrial fractions), Ahi1-KO mouse, mtDNA copy number assay, ATP measurement\",\n      \"journal\": \"Cell communication and signaling : CCS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-qPCR establishing GR binding to mtDNA D-loop in Ahi1-dependent manner, Co-IP complex identification, KO mouse, single lab\",\n      \"pmids\": [\"36691038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In CEP290-null photoreceptors, AHI1 (normally a transition zone protein) is abnormally restricted to the proximal connecting cilium rather than distributed throughout the transition zone, indicating that CEP290 is required for proper spatial distribution of AHI1 within the connecting cilium.\",\n      \"method\": \"CEP290-null mouse retina, advanced microscopy (super-resolution), immunostaining for transition zone proteins\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single study, localization observation in KO context without functional rescue or mechanistic follow-up for the AHI1-specific finding\",\n      \"pmids\": [\"bio_10.1101_2025.01.20.633784\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"AHI1 (Jouberin) is a scaffolding/adaptor protein that localizes to the transition zone (mother centriole/basal body) of primary cilia, where it regulates ciliogenesis and ciliary cargo trafficking (including Rab8a-dependent polarized vesicular transport, Arl13b ciliary membrane localization and stability, and MCHR1 ciliary targeting for downstream GPCR signaling); in neurons it forms a stable complex with HAP1 to regulate TrkB endocytic sorting and signaling, interacts with GR to control its cytoplasmic stability and nuclear translocation under stress, recruits OTUD1 to deubiquitinate and stabilize Tyk2 for basal IFN-I antiviral signaling, and in leukemia cells forms an AHI-1/BCR-ABL/JAK2 complex (via its SH3 domain, whose crystal structure is resolved) that modulates JAK2-STAT5 phosphorylation and tyrosine kinase inhibitor resistance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AHI1 (Jouberin) is a modular SH3- and WD40-repeat scaffolding/adaptor protein that operates at the primary cilium transition zone and in neuronal cytoplasmic signaling, with loss-of-function mutations causing Joubert syndrome featuring cerebellar malformation and abnormal axonal decussation [#1, #2]. At the ciliary base, AHI1 localizes to the mother centriole/basal body, where its recruitment to a ring-shaped transition-zone domain depends on Cby1, and where it is required for ciliogenesis and polarized vesicular trafficking by stabilizing the small GTPase Rab8a [#3, #16]. AHI1 governs ciliary cargo: it sustains Arl13b ciliary membrane localization and proteasomal stability to support Sonic hedgehog signaling and proper axoneme length, mediates outer-segment protein transport in photoreceptors, and targets the GPCRs MCHR1 to the ciliary membrane for downstream cAMP/ERK signaling [#9, #21, #25]. Its WD40 region binds NPHP1, and Joubert/retinitis pigmentosa mutations in this region destabilize AHI1 and impair its ciliary-base enrichment, whereas the C-terminal SH3 domain is dispensable for normal development [#15, #17, #18]. In neurons AHI1 forms a stable complex with HAP1 that regulates TrkB receptor endocytic sorting and signaling, and AHI1 controls additional partners including 5-HT2CR, Cend1, GR, and APP to influence neurite outgrowth, feeding behavior, and stress-related/depressive phenotypes [#4, #10, #12, #14, #22, #24]. Beyond ciliary and neuronal roles, AHI1 has hematopoietic and immune functions: an AHI-1/BCR-ABL/JAK2 complex assembled via its SH3 domain modulates JAK2-STAT5 phosphorylation and tyrosine kinase inhibitor resistance in leukemia, and AHI1 recruits the deubiquitinase OTUD1 to stabilize Tyk2 and maintain basal type-I interferon signaling [#6, #13, #27].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established AHI1's molecular architecture and first link to signal transduction by identifying it as a provirus-targeted gene encoding an SH3/WD40 modular protein.\",\n      \"evidence\": \"cDNA cloning and provirus integration mapping in Abelson pre-B-cell lymphomas\",\n      \"pmids\": [\"12186888\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct binding partners or substrates defined\", \"Functional consequence of truncation not yet shown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined AHI1 as the causative gene for Joubert syndrome, connecting its loss to cerebellar malformation and abnormal axonal decussation and anchoring its developmental role.\",\n      \"evidence\": \"Human mutation identification with brain expression analysis\",\n      \"pmids\": [\"15322546\", \"15467982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of axon guidance defect unresolved\", \"Cellular pathway connecting mutations to phenotype not yet defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Placed AHI1 at the ciliary basal body and established its requirement for ciliogenesis via Rab8a stabilization and polarized vesicle trafficking.\",\n      \"evidence\": \"shRNAi knockdown, knockout mouse, immunolocalization and trafficking assays\",\n      \"pmids\": [\"19625297\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct biochemical interaction with Rab8a not demonstrated\", \"How AHI1 stabilizes Rab8a mechanistically unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified a stable AHI1-HAP1 complex that regulates TrkB receptor internalization and signaling, linking AHI1 to neuronal differentiation distinct from its ciliary role.\",\n      \"evidence\": \"Reciprocal Co-IP, HAP1-KO mouse, neurite outgrowth and TrkB signaling assays\",\n      \"pmids\": [\"18636121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface within AHI1 not mapped\", \"Relationship between HAP1 complex and ciliary function unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed an oncogenic role through an AHI-1/BCR-ABL/JAK2 complex modulating JAK2-STAT5 phosphorylation and TKI resistance in leukemia.\",\n      \"evidence\": \"Co-IP, RNAi/overexpression in hematopoietic cells, in vivo leukemia induction, phosphorylation assays\",\n      \"pmids\": [\"18936234\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which AHI1 domain mediates complex assembly not yet resolved here\", \"Whether interactions are direct unconfirmed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended AHI-1 signaling in lymphoma by linking it to HCK kinase and BIN1 effectors and autocrine cytokine production.\",\n      \"evidence\": \"Retroviral RNAi, microarray, Western blot and single Co-IP (BIN1-MYC) in CTCL cells\",\n      \"pmids\": [\"19211505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BIN1-MYC interaction rests on a single Co-IP\", \"Direct vs indirect link of AHI-1 to HCK not established\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated cilium-specific cargo trafficking by showing AHI1 is needed for photoreceptor outer segment formation and selective outer-segment protein transport, again via Rab8a.\",\n      \"evidence\": \"KO mouse histology, opsin/transducin/Rom1 localization, Nphp1 genetic epistasis and opsin dosage rescue\",\n      \"pmids\": [\"20081859\", \"20592197\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct AHI1-Rab8a biochemistry still inferred\", \"Selectivity mechanism for ciliary versus synaptic cargo unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected neuronal AHI1 loss to TrkB degradation and depressive phenotypes, establishing a behaviorally relevant TrkB-signaling axis.\",\n      \"evidence\": \"Conditional Cre-loxP KO, endocytic TrkB degradation assay, viral TrkB rescue in amygdala\",\n      \"pmids\": [\"20956301\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TrkB regulation requires HAP1 complex not addressed\", \"Mechanism of endocytic sorting unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Generalized the ciliary requirement across systems and added a cell-cell junction role using zebrafish and renal epithelial loss-of-function.\",\n      \"evidence\": \"Zebrafish morpholino, siRNA in renal cells, cilia and junction assessment\",\n      \"pmids\": [\"21959375\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Junction-formation mechanism undefined\", \"Morpholino specificity concerns inherent to method\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified AHI1 as a regulator of 5-HT2CR lysosomal degradation in the hypothalamus, linking it to feeding behavior and body weight.\",\n      \"evidence\": \"Co-IP, co-localization, lysosomal inhibitor assays, hypothalamic knockdown, feeding measurement\",\n      \"pmids\": [\"22123816\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding site not mapped\", \"Single-lab finding without reciprocal validation\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the AHI-1 SH3 domain crystal structure and showed its deletion sensitizes BCR-ABL+ cells to TKIs, identifying Dynamin-2 as an SH3 partner.\",\n      \"evidence\": \"X-ray crystallography (1.53 Å), SH3 deletion mutagenesis, Co-IP, apoptosis assay\",\n      \"pmids\": [\"22623184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of Dynamin-2 interaction not explored\", \"Structure of WD40 region unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped binding determinants and partners (NGF-regulated HAP1A, Cend1) and clarified that JBTS mutations destabilize AHI1 and disrupt NPHP1 binding while HAP1 binding is dispensable for ciliogenesis.\",\n      \"evidence\": \"Co-IP, mass spectrometry, mutant constructs, protein stability and ciliogenesis assays in patient fibroblasts, Cend1 rescue\",\n      \"pmids\": [\"23658157\", \"23532844\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NPHP1 binding supports ciliary localization mechanistically unknown\", \"Structural basis of mutation effects on WD40 fold not solved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified Cby1 as the upstream factor recruiting AHI1 to a defined transition-zone ring at the centriole-cilium interface.\",\n      \"evidence\": \"Superresolution microscopy (3D-SIM, STED) and Cby1-KO cells\",\n      \"pmids\": [\"25103236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct Cby1-AHI1 interaction not biochemically confirmed\", \"Functional consequence of mislocalized AHI1 in Cby1-KO not measured\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Distinguished functional from dispensable domains, showing C-terminal SH3 truncations are non-pathogenic and pathogenicity requires N-terminal WD40 disruption.\",\n      \"evidence\": \"Whole-exome sequencing, homozygosity mapping, zebrafish morpholino N- vs C-terminal targeting\",\n      \"pmids\": [\"25616960\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise WD40 functional motifs not delineated\", \"Reconciliation with SH3's role in leukemia not addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Linked WD40-domain missense variants to non-syndromic retinitis pigmentosa via reduced ciliary-base enrichment of Jouberin.\",\n      \"evidence\": \"Exome sequencing, homology modeling, recombinant mutant expression in ciliated RPE cells\",\n      \"pmids\": [\"28442542\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of base enrichment loss undefined\", \"Single-lab functional assay\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Refined the photoreceptor phenotype, showing Ahi1 is required for outer-segment disc morphogenesis and maintenance but not basic connecting cilium formation.\",\n      \"evidence\": \"TALEN zebrafish mutant, histology, EM, transition-zone protein localization\",\n      \"pmids\": [\"28118669\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular cargo defect underlying disc phenotype unresolved\", \"Species-specific differences not reconciled\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established AHI1's control of Arl13b ciliary localization/stability and downstream Shh signaling, axoneme length, and PDGFR-α-dependent cell migration.\",\n      \"evidence\": \"Ahi1-KO MEFs with Ahi1-GFP rescue, proteasome inhibition, Smo/Gli and migration assays\",\n      \"pmids\": [\"31391239\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AHI1 directly binds Arl13b not shown\", \"Link between Arl13b stabilization and Rab8a pathway unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved a long-standing question by showing the retinal axon misprojection phenotype reflects a toxic gain-of-function of truncated Ahi1 rather than loss of function.\",\n      \"evidence\": \"Zebrafish morpholino/CRISPR truncation versus null comparison, RGC axon analysis\",\n      \"pmids\": [\"30949029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of toxic gain-of-function undefined\", \"Relevance to human Joubert axon phenotype not directly tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an APP-binding role for AHI1 that inhibits amyloidogenic processing and enhances ERK-dependent survival, linking AHI1 to Alzheimer-relevant biology.\",\n      \"evidence\": \"Co-IP, Western blot for CTFβ/Aβ42, overexpression and knockdown in AD model cells\",\n      \"pmids\": [\"31062249\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect AHI1-APP interaction not resolved\", \"In vivo relevance to disease progression untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanded AHI1's GPCR-trafficking role to ciliary targeting of MCHR1, demonstrating ciliary localization is required for downstream cAMP/ERK signaling.\",\n      \"evidence\": \"Ahi1-/- neuronal culture, ciliary vs surface MCHR1 immunofluorescence, cAMP and ERK assays\",\n      \"pmids\": [\"33741721\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of selective ciliary targeting unknown\", \"Whether AHI1 directly binds MCHR1 not established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined AHI1 as a cytoplasmic stabilizer and translocation regulator of the glucocorticoid receptor under stress, with behavioral antidepressant consequences.\",\n      \"evidence\": \"Co-IP, Ahi1-KO mouse, nuclear/cytoplasmic fractionation, antidepressant treatment\",\n      \"pmids\": [\"33782379\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct binding interface not mapped\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified Tet2 as an AHI1 partner whose stress-induced nuclear translocation depends on AHI1, linking AHI1 to epigenetic regulation.\",\n      \"evidence\": \"Tet2 IP mass spectrometry, Co-IP, Ahi1-KO/knockdown, fractionation, 5hmC profiling\",\n      \"pmids\": [\"34218273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional outcome of altered Tet2 localization on gene expression incompletely defined\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established AHI1 as a stabilizer of basal type-I interferon signaling by recruiting OTUD1 to deubiquitinate and stabilize Tyk2, connecting it to antiviral immunity.\",\n      \"evidence\": \"Co-IP of AHI1-OTUD1-Tyk2 complex, ubiquitination assays, knockdown/KO, patient PBMCs and depression model mice\",\n      \"pmids\": [\"35821088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain of AHI1 mediating OTUD1/Tyk2 recruitment not mapped\", \"Relationship to other JAK-family roles unexplored\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended the GR axis to serotonin synthesis via GR/ERβ/TPH2 regulation and explained sex differences in depressive behavior through E2 levels.\",\n      \"evidence\": \"Dual-luciferase reporter of GR-ERβ promoter binding, knockdown, Ahi1-KO mouse, ERβ agonist rescue, E2 measurement\",\n      \"pmids\": [\"35643536\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of sex-specific E2 effect undefined\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed a mitochondrial AHI1/GR complex that, with TFAM, regulates mtDNA copy number and brain ATP via D-loop binding, linking AHI1 to bioenergetics and exercise responses.\",\n      \"evidence\": \"Co-IP, ChIP-qPCR of GR binding to mtDNA D-loop, mitochondrial fractionation, Ahi1-KO mouse, mtDNA/ATP assays\",\n      \"pmids\": [\"36691038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How AHI1 reaches mitochondria not defined\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed CEP290 is required for proper spatial distribution of AHI1 within the connecting cilium, placing AHI1 downstream of CEP290 in transition-zone organization.\",\n      \"evidence\": \"CEP290-null mouse retina with super-resolution immunostaining (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.01.20.633784\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Preprint, single observational study without functional rescue\", \"AHI1-CEP290 biochemical relationship not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single scaffold reconciles its transition-zone ciliary cargo functions with its diverse cytoplasmic, mitochondrial, immune, and oncogenic partner interactions remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unified domain-mapping across AHI1's many partners\", \"Whether ciliary and non-ciliary roles share a common biochemical activity is unknown\", \"No high-resolution structure of the WD40 region\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 6, 13, 27]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 9, 21, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [3, 16, 30]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [3, 21, 25]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 14, 24]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [29]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [24, 26]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3, 9, 21, 25]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 6, 21, 25]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 2, 8]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [27]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [21, 27]}\n    ],\n    \"complexes\": [\n      \"AHI-1/BCR-ABL/JAK2 complex\",\n      \"AHI1-HAP1 complex\",\n      \"AHI1-OTUD1-Tyk2 complex\"\n    ],\n    \"partners\": [\n      \"HAP1\",\n      \"NPHP1\",\n      \"Rab8a\",\n      \"Arl13b\",\n      \"BCR-ABL\",\n      \"JAK2\",\n      \"OTUD1\",\n      \"GR\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}