{"gene":"AUTS2","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2014,"finding":"Cytoplasmic AUTS2 localizes not only in nuclei but also in the cytoplasm including growth cones of developing neurons (shown by immunohistochemistry and fractionation). Cytoplasmic AUTS2 activates Rac1 to induce lamellipodia but downregulates Cdc42 to suppress filopodia. Loss-of-function and rescue experiments showed that a cytoplasmic AUTS2-Rac1 pathway is required for cortical neuronal migration and neuritogenesis in the developing brain.","method":"Immunohistochemistry, subcellular fractionation, loss-of-function and rescue experiments in developing brain, Rho GTPase activity assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal localization by two orthogonal methods (IHC + fractionation), functional rescue experiments, GTPase activity measurements in single focused study","pmids":["25533347"],"is_preprint":false},{"year":2021,"finding":"AUTS2 is a component of non-canonical PRC1 complexes (ncPRC1.3 and ncPRC1.5) that convert Polycomb repressive function to transcriptional activation. The HX repeat domain of AUTS2 is required for interaction with P300 (histone acetyltransferase). Mutations in the HX repeat domain disrupt the AUTS2-P300 interaction and cause misregulation of developmental genes. The transcription factor NRF1 is required for ncPRC1.3 recruitment to chromatin and plays an integral role in this neurodevelopmental transcriptional activation program. Loss of AUTS2 or mutation in its HX repeat domain curtails motor neuron differentiation of mouse embryonic stem cells.","method":"Co-immunoprecipitation, genomic/chromatin analyses, mouse embryonic stem cell differentiation assays, patient variant characterization, ChIP","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, functional rescue, patient variants with biochemical validation, multiple orthogonal methods in single rigorous study","pmids":["34637754"],"is_preprint":false},{"year":2018,"finding":"WDR68 is an integral component of the PRC1-AUTS2 complex and is required for PRC1-AUTS2-mediated transcriptional activation. Deletion of Wdr68 in mouse embryonic stem cells causes defects in neuronal differentiation without affecting self-renewal, and downregulates many PRC1-AUTS2 target neuronal differentiation genes.","method":"Co-immunoprecipitation, mouse embryonic stem cell knockout, transcriptomic analysis (RNA-seq)","journal":"Stem cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP identifying complex component, KO with transcriptomic and functional readout, single lab","pmids":["30448639"],"is_preprint":false},{"year":2019,"finding":"AUTS2 protein isoforms differ in their interactions and transcriptional activities. Yeast two-hybrid screen identified splicing factor SF3B1 as an interactor of both long and short isoforms; Polycomb group proteins PCGF3 and PCGF5 interact exclusively with the long AUTS2 isoform. The first exons of the long AUTS2 isoform function as a transcriptional repressor, while the region constituting the short isoform acts as a transcriptional activator. PCGF3 expression levels influence the long AUTS2 isoform's ability to activate or repress transcription. Mouse ESCs with truncated AUTS2 (missing exons 12-20) show premature neuronal differentiation.","method":"Yeast two-hybrid screen, reporter transcription assays, mouse embryonic stem cell loss-of-function experiments","journal":"Molecular psychiatry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — yeast two-hybrid plus reporter assays plus cell-based functional experiments, single lab, multiple orthogonal methods","pmids":["30953002"],"is_preprint":false},{"year":2014,"finding":"Genome-wide ChIP-seq in mouse embryonic day 16.5 forebrains showed that Auts2 binds predominantly to promoters of genes highly expressed in the developing forebrain, consistent with a role in transcriptional activation. Auts2-bound non-promoter regions overlap with developing brain-associated enhancer marks. Auts2-marked sequences are enriched for neurodevelopmental transcription factor binding motifs (Pitx3, TCF3). Two functional brain enhancers near ASD-implicated genes NRXN1 and ATP2B2 are bound by Auts2.","method":"ChIP-seq, RNA-seq on mouse embryonic forebrains, functional enhancer assays","journal":"Translational psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP-seq with RNA-seq orthogonal validation, single lab, functional enhancer assays","pmids":["25180570"],"is_preprint":false},{"year":2020,"finding":"AUTS2 specifically regulates excitatory synapse number in neurons. Auts2-deficient primary cultured neurons and Auts2 mutant forebrains show specifically increased excitatory synapses. Electrophysiological recordings confirmed increased excitatory synaptic inputs and increased c-fos expression in mutant brains, indicating enhanced brain excitability due to altered E/I balance. Auts2 mutant mice exhibited autistic-like behaviors including impaired social interaction and altered vocal communication.","method":"Conditional knockout mice, electrophysiology, immunostaining, c-fos expression analysis, behavioral assays","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple orthogonal cellular and electrophysiological readouts plus behavioral phenotype, single lab","pmids":["32498016"],"is_preprint":false},{"year":2020,"finding":"AUTS2 is required for Purkinje cell maturation in the cerebellum. Auts2 conditional knockout mice exhibited smaller and deformed cerebella containing immature-shaped Purkinje cells with reduced expression of Cacna1a. Auts2 cKO and knockdown experiments implicated AUTS2 in elimination and translocation of climbing fiber synapses and restriction of parallel fiber synapse numbers. Auts2 cKO mice exhibited behavioral impairments in motor learning and vocal communications.","method":"Conditional knockout mice, immunostaining, knockdown experiments, behavioral assays","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with multiple orthogonal cellular phenotype readouts (synaptic, molecular, behavioral), single lab","pmids":["33305180"],"is_preprint":false},{"year":2021,"finding":"AUTS2 associates with multiple proteins that regulate RNA transcription, splicing, localization, and stability in neonatal mouse cerebral cortex, identified by proteomics (mass spectrometry). AUTS2-containing protein complexes isolated from cortical tissue bound specific RNA transcripts as shown by RNA immunoprecipitation and sequencing (RIP-seq). Conditional excision of Auts2 exon 15 caused breathing abnormalities, neonatal lethality, dentate gyrus hypoplasia with agenesis of hilar mossy neurons, abnormal EEG spiking, and dysregulation of RNA transcripts normally associated with AUTS2.","method":"Proteomics/mass spectrometry (pull-down of binding partners), RNA immunoprecipitation and sequencing (RIP-seq), conditional knockout mice, EEG, histology","journal":"Cerebral cortex","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — proteomics identification of binding partners combined with RIP-seq demonstrating RNA binding, functional KO with multiple phenotypic readouts, single lab but multiple orthogonal methods","pmids":["34013328"],"is_preprint":false},{"year":2022,"finding":"AUTS2 together with WDR68 and SKI forms a novel protein complex (AWS) in neuronal progenitors, independent of PRC1, that promotes neuronal differentiation by inhibiting BMP signaling. The AWS complex recruits the CUL4 E3 ubiquitin ligase complex to mediate poly-ubiquitination and proteasomal degradation of phosphorylated SMAD1/5/9, thereby suppressing BMP signaling. Manipulation of the AWS complex in primary cortical neurons leads to aberrant BMP signaling and dysregulated neuronal gene expression.","method":"Co-immunoprecipitation (protein complex identification), genomic and biochemical analyses, ubiquitination assays, primary cortical neuron manipulation","journal":"Stem cell reviews and reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying novel complex, biochemical ubiquitination assays, in vivo neuronal validation, single lab","pmids":["36258139"],"is_preprint":false},{"year":2013,"finding":"Knockdown of auts2 in zebrafish leads to smaller head size, neuronal reduction, and decreased mobility. The full-length and C-terminal AUTS2 isoforms both rescued microcephaly caused by auts2 suppression in zebrafish. Twenty-three functional zebrafish enhancers were identified for AUTS2, 10 of which were active in the brain, and three mouse brain enhancers were characterized that overlap with ASD-associated deletions.","method":"Zebrafish morpholino knockdown, rescue experiments with human AUTS2 isoforms, zebrafish and mouse enhancer assays (transient transgenics)","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino knockdown with isoform rescue in zebrafish, enhancer activity tested in two model organisms, single lab","pmids":["23349641"],"is_preprint":false},{"year":2013,"finding":"Exonic deletions of AUTS2 cause syndromic intellectual disability. The C-terminal region of AUTS2 encodes an alternative isoform (with an alternative transcription start site in a 3' exon) expressed in human brain. Suppression of auts2 in zebrafish embryos caused microcephaly that could be rescued by either the full-length or the C-terminal isoform of AUTS2.","method":"Zebrafish morpholino knockdown, rescue with human AUTS2 isoforms, molecular characterization of isoforms","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform rescue in zebrafish with orthogonal patient genetic data, single lab","pmids":["23332918"],"is_preprint":false},{"year":2022,"finding":"Deletion of Auts2 in mice causes postnatal dentate gyrus (DG) hypoplasia through a transcription repressor mechanism affecting neural cell migration in postnatal DG development. The SuM-DG-CA3 neural circuit is involved in social recognition and is disrupted in Auts2-deleted mice due to DG hypoplasia. Correction of DG-CA3 synaptic transmission pharmacologically, or chemo/optogenetic activation of the SuM-DG circuit, restored social recognition deficit.","method":"Auts2 conditional knockout mice, neural circuit tracing, optogenetics, chemogenetics, pharmacological rescue","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Moderate — KO with multiple orthogonal rescue approaches (pharmacological, optogenetic, chemogenetic), circuit-level mechanism defined, single lab","pmids":["35235353"],"is_preprint":false},{"year":2023,"finding":"AUTS2 missense variant in a patient causes reduced cerebral organoid growth, deficits in neural progenitor cell (NPC) proliferation, and disrupted NPC polarity within ventricular zone-like regions. CRISPR-Cas9 correction of the variant rescued organoid growth and NPC proliferative deficits. Single-cell RNA sequencing revealed reduced G1/S transition gene expression and alterations in WNT-β-catenin signalling within proband NPCs.","method":"Human cerebral organoid model, CRISPR-Cas9 gene editing rescue, single-cell RNA sequencing","journal":"Brain","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — CRISPR rescue in human organoids with scRNA-seq mechanistic pathway identification, multiple orthogonal methods, single lab","pmids":["35802027"],"is_preprint":false},{"year":2024,"finding":"AUTS2 disruption in human cerebral organoids (via CRISPR/Cas9 knockout in human ESCs) reduces populations of cells committed to neuronal lineage and causes overabundance of cells resembling choroid plexus (ChP) cells. AUTS2 negatively regulates the WNT/β-catenin signaling pathway, demonstrated by overactivation in AUTS2-deficient organoids and in luciferase reporter cells lacking AUTS2. Treatment with a WNT inhibitor reversed overexpression of ChP genes and increased downregulated neuronal gene expression in AUTS2-deficient organoids.","method":"CRISPR/Cas9 knockout in human ESCs, cerebral organoid culture, transcriptomic analysis, luciferase reporter assays, WNT inhibitor pharmacological rescue","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — KO in human organoids with luciferase reporter biochemical validation and pharmacological rescue, multiple orthogonal methods, single lab","pmids":["39174599"],"is_preprint":false},{"year":2016,"finding":"In T-cell leukemia, AUTS2 protein interacts with polycomb repressor complex 1 subtype 5 (PRC1.5), converting this complex into a transcriptional activator. AUTS2 activated transcription of NKL homeobox gene MSX1, while PCGF5 repressed it. AUTS2 expression in T-ALL is activated by IL7-IL7R-STAT5 signalling and MEF2C.","method":"Gene expression profiling, forced expression and pharmacological inhibition, H3K27me3 analysis, functional transcriptional assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional assays with forced expression and inhibition, single lab, indirect evidence for PRC1.5 complex function","pmids":["27322685"],"is_preprint":false},{"year":2017,"finding":"Repeated cocaine administration specifically increased Auts2 gene expression in D2-type medium spiny neurons in the nucleus accumbens (but not other regions), an effect seen in male but not female mice. Chromosomal looping connecting Auts2 to the Caln1 gene locus (bypassing 1524 kb of linear genome) was disrupted after repeated cocaine exposure, resulting in increased expression of both genes. Cocaine exposure reduces binding of CTCF (chromosomal scaffolding protein) and increases histone and DNA methylation at the Auts2-Caln1 loop base. Cell type-specific overexpression of Auts2 in D2-type medium spiny neurons promotes cocaine reward.","method":"Chromosome conformation capture (3C, 4C), FACS cell-type sorting, viral-mediated cell-type-specific overexpression, behavioral cocaine reward assays","journal":"Biological psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — 3C/4C chromatin conformation, cell-type specific OE with behavioral readout, single lab, multiple methods","pmids":["28577753"],"is_preprint":false},{"year":2009,"finding":"Auts2 protein is localized in the nuclei of neurons and some neuronal progenitors in the developing mouse brain, as shown by immunohistochemistry and western blotting. Auts2 mRNA and protein are highly expressed in developing cerebral cortex, cerebellum (including Purkinje cells and deep nuclei), frontal cortex, hippocampus, dorsal thalamus, olfactory bulb, inferior colliculus, and substantia nigra. Auts2 protein expression colocalizes with Tbr1, a transcription factor specific for postmitotic projection neurons.","method":"Immunohistochemistry, in situ hybridization, western blotting in developing mouse brain","journal":"Gene expression patterns","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — nuclear localization by two orthogonal methods (IHC + western blot), colocalization with neuron-specific marker, single lab","pmids":["19948250"],"is_preprint":false},{"year":2025,"finding":"AUTS2 interacts with Polycomb complex PRC2 and cooperates with it to promote intermediate progenitor cell (IPC) division in the developing cortex. AUTS2 primarily represses transcription of target genes (including Robo1) in IPCs, with regions around transcriptional start sites of AUTS2 targets enriched for H3K27me3. Loss of AUTS2 reduces H3K27me3 at target loci and increases Robo1 expression, suppressing IPC division and causing fewer upper-layer neurons and microcephaly.","method":"Mouse Auts2 mutants, chromatin profiling (H3K27me3 ChIP), transcriptomics, Co-immunoprecipitation (AUTS2-PRC2 interaction), in vivo histological analysis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — Co-IP demonstrating AUTS2-PRC2 interaction, chromatin profiling with transcriptomic validation, mechanistic rescue by target gene, single lab but multiple rigorous orthogonal methods","pmids":["39815005"],"is_preprint":false},{"year":2025,"finding":"AUTS2 directly binds RNA in human neural progenitor cells (NPCs), as demonstrated by eCLIP-seq, defining its direct RNA interactome for the first time. AUTS2 also binds chromatin targets (ChIP-seq). AUTS2 knockdown in NPCs leads to widespread gene expression changes, impaired cell proliferation, migration, and neurite outgrowth. Integrated analysis revealed downregulation of WNT pathway genes including WNT7A among targets directly bound by AUTS2 at both chromatin and RNA levels. Supplementation with WNT7A rescued cellular phenotypes in AUTS2-deficient NPCs.","method":"eCLIP-seq (direct RNA binding), ChIP-seq (chromatin binding), siRNA knockdown in human NPCs, WNT7A rescue experiments","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — eCLIP-seq directly demonstrates RNA binding, ChIP-seq for chromatin, functional rescue with WNT7A; preprint, not yet peer-reviewed","pmids":["41278797"],"is_preprint":true},{"year":2024,"finding":"AUTS2 is expressed in neural progenitor cells during peak neurogenesis. Upregulation of AUTS2 via in utero electroporation in developing cerebral cortex increased basal progenitor numbers and neurons. Loss of AUTS2-l (long isoform) in Calbindin 1-expressing cell lineages is sufficient to yield learning/memory deficits, hyperactivity, and abnormal dentate gyrus granule cell maturation.","method":"In utero electroporation, conditional knockout mice targeting Calbindin 1 lineage, immunofluorescence, cell tracing and sorting, transcriptomic profiling","journal":"Journal of advanced research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in utero electroporation gain-of-function and conditional KO with cell-type and lineage specificity, multiple phenotypic readouts, single lab","pmids":["39013538"],"is_preprint":false},{"year":2024,"finding":"Brain-wide ablation of the AUTS2 long isoform (AUTS2-l) generates specific subsets of behavioral and brain phenotypes (dominant hyperactivity and repetitive behaviors) distinct from those caused by mutations disrupting both isoforms. Hundreds of putative direct AUTS2-l target genes were identified in postnatal brain. AUTS2-l ablation restricted to Calbindin 1-expressing cell lineages is sufficient for learning/memory deficits and hyperactivity with abnormal dentate gyrus granule cell maturation.","method":"Isoform-specific conditional knockout mice, behavioral phenotyping, brain gene expression profiling, cell-lineage-specific conditional KO","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — isoform-specific and cell-type-specific KO with multiple behavioral and molecular readouts, single lab","pmids":["37816306"],"is_preprint":false},{"year":2016,"finding":"AUTS2 in the nucleus accumbens (NAc) suppresses heroin-induced locomotor sensitization. Chronic heroin administration specifically decreased AUTS2 mRNA and protein expression in the NAc but not caudate-putamen. Lentiviral-AUTS2-shRNA knockdown in the NAc enhanced heroin-induced locomotor sensitization, while AUTS2 overexpression attenuated the locomotor-stimulant effects of heroin.","method":"Lentiviral shRNA knockdown and overexpression in mouse NAc, behavioral locomotor sensitization assays, qRT-PCR, western blot","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional manipulation (KD and OE) with behavioral readout, region-specific effect confirmed, single lab","pmids":["27423627"],"is_preprint":false}],"current_model":"AUTS2 is a multifunctional neurodevelopmental regulator with both nuclear and cytoplasmic roles: in the nucleus, it acts as a component of non-canonical PRC1 complexes (ncPRC1.3/ncPRC1.5) where its HX repeat domain recruits P300 to activate transcription of neuronal genes, interacts with PRC2 to repress targets (e.g., Robo1) and promote intermediate progenitor division, and directly binds both chromatin and RNA to regulate gene expression in neural progenitors; in the cytoplasm, it activates Rac1 and suppresses Cdc42 to regulate actin cytoskeletal dynamics required for neuronal migration and neuritogenesis; postnatally, it suppresses excitatory synapse number to maintain E/I balance, and it is required for Purkinje cell maturation, dentate gyrus development, and cerebellar circuit formation."},"narrative":{"mechanistic_narrative":"AUTS2 is a multifunctional neurodevelopmental regulator that acts in both the nucleus and cytoplasm to control neuronal differentiation, migration, and circuit formation [PMID:25533347, PMID:19948250]. In the nucleus, AUTS2 is a context-dependent transcriptional switch within Polycomb machinery: as a component of non-canonical PRC1 complexes (ncPRC1.3/ncPRC1.5), its HX repeat domain recruits the histone acetyltransferase P300 to convert Polycomb repression into activation of neurodevelopmental genes, with NRF1 directing complex recruitment to chromatin and patient HX-domain mutations disrupting the P300 interaction and gene regulation [PMID:34637754, PMID:19948250]; conversely, AUTS2 also cooperates with PRC2 to deposit H3K27me3 and repress targets such as Robo1, promoting intermediate progenitor division and cortical neuron output [PMID:39815005]. Its activity is isoform-dependent, with long and short isoforms exerting opposing repressive versus activating effects and engaging distinct partners including SF3B1 and PCGF3/PCGF5 [PMID:30953002]. Beyond canonical Polycomb roles, AUTS2 forms an AWS complex with WDR68 and SKI that recruits the CUL4 ubiquitin ligase to degrade phosphorylated SMAD1/5/9 and suppress BMP signaling [PMID:36258139], and it directly binds both chromatin and RNA in neural progenitors to regulate WNT pathway genes including WNT7A, whose supplementation rescues proliferation, migration, and neurite outgrowth defects [PMID:41278797, PMID:39174599]. In the cytoplasm, AUTS2 activates Rac1 and downregulates Cdc42 to remodel the actin cytoskeleton during cortical neuronal migration and neuritogenesis [PMID:25533347]. Functionally, AUTS2 controls neural progenitor proliferation and lineage commitment, restrains excitatory synapse number to maintain E/I balance, and is required for Purkinje cell maturation and dentate gyrus development underlying social recognition and motor learning [PMID:32498016, PMID:33305180, PMID:35235353, PMID:35802027]. Exonic deletions and missense variants of AUTS2 cause syndromic intellectual disability and autism-like phenotypes [PMID:23332918, PMID:35802027].","teleology":[{"year":2009,"claim":"Establishing where AUTS2 protein resides and which cells express it was the first step toward assigning function, showing it is a nuclear protein enriched in developing forebrain, cerebellum, and postmitotic projection neurons.","evidence":"Immunohistochemistry, in situ hybridization, and western blotting in developing mouse brain with Tbr1 co-localization","pmids":["19948250"],"confidence":"Medium","gaps":["No molecular function assigned","Nuclear-only view incomplete given later cytoplasmic findings"]},{"year":2013,"claim":"Linking AUTS2 dosage to brain size and patient disease established it as a causal neurodevelopmental gene and defined functional isoforms plus distant enhancers.","evidence":"Zebrafish morpholino knockdown with human isoform rescue, patient exonic deletion analysis, and enhancer transgenic assays","pmids":["23349641","23332918"],"confidence":"Medium","gaps":["Molecular mechanism of microcephaly not resolved","Isoform-specific molecular activities undefined"]},{"year":2014,"claim":"Two studies split AUTS2 function across compartments: a cytoplasmic Rac1/Cdc42 actin-regulatory role in migration/neuritogenesis, and a nuclear promoter/enhancer-binding role in transcriptional activation.","evidence":"Subcellular fractionation, Rho GTPase activity assays, rescue in developing brain; ChIP-seq/RNA-seq in mouse forebrain with enhancer assays","pmids":["25533347","25180570"],"confidence":"High","gaps":["Mechanism coupling cytoplasmic and nuclear pools unknown","Direct GEF/GAP partners for Rac1/Cdc42 control not identified"]},{"year":2016,"claim":"AUTS2 was placed inside non-canonical PRC1 as a converter of Polycomb repression to activation, and shown to be regulated in addiction circuitry, broadening its functional context.","evidence":"Transcriptional and H3K27me3 assays in T-ALL; lentiviral knockdown/overexpression in mouse nucleus accumbens with locomotor behavior","pmids":["27322685","27423627"],"confidence":"Medium","gaps":["PRC1.5 mechanism in T-ALL was indirect","Generalizability of activator role beyond leukemia unclear at this stage"]},{"year":2018,"claim":"Defining WDR68 as an integral subunit of the PRC1-AUTS2 complex showed the complex requires specific cofactors for transcriptional activation and neuronal differentiation.","evidence":"Reciprocal Co-IP and Wdr68 knockout in mouse ESCs with RNA-seq","pmids":["30448639"],"confidence":"Medium","gaps":["WDR68 contribution to activation mechanism not mechanistically dissected","Single-lab finding"]},{"year":2019,"claim":"Isoform-resolved interactome and reporter analysis explained how AUTS2 can be both repressor and activator: long-isoform first exons repress while the short region activates, with PCGF3 tuning the balance.","evidence":"Yeast two-hybrid screen, reporter transcription assays, and truncated-AUTS2 mouse ESC experiments","pmids":["30953002"],"confidence":"Medium","gaps":["In vivo relevance of SF3B1 interaction not established","How PCGF3 levels are physiologically set is unknown"]},{"year":2020,"claim":"Conditional knockouts revealed concrete postnatal functions: restraint of excitatory synapse number for E/I balance and requirement for Purkinje cell maturation and cerebellar synapse refinement.","evidence":"Conditional KO mice with electrophysiology, immunostaining, c-fos analysis, and behavioral assays","pmids":["32498016","33305180"],"confidence":"High","gaps":["Molecular targets driving synaptic and Purkinje phenotypes not fully mapped","Link between transcriptional role and synaptic phenotypes incomplete"]},{"year":2021,"claim":"AUTS2 was shown to be an RNA-associated regulator and an HX-domain-dependent P300 recruiter, integrating a direct RNA-binding role with the ncPRC1.3/1.5 activation mechanism validated by patient variants.","evidence":"Proteomics and RIP-seq from cortex with conditional KO phenotyping; Co-IP, ChIP, ESC differentiation, and patient variant biochemistry","pmids":["34013328","34637754"],"confidence":"High","gaps":["Whether AUTS2 binds RNA directly versus via partners not resolved here","Functional consequence of RNA binding undefined"]},{"year":2022,"claim":"Two studies expanded AUTS2's reach beyond Polycomb: a PRC1-independent AWS complex degrading phospho-SMAD1/5/9 to suppress BMP signaling, and a dentate gyrus circuit mechanism underlying social recognition.","evidence":"Co-IP and ubiquitination assays in neuronal progenitors; conditional KO with circuit tracing, optogenetic, chemogenetic, and pharmacological rescue","pmids":["36258139","35235353"],"confidence":"Medium","gaps":["AWS complex stoichiometry and CUL4 recruitment mechanism not detailed","Direct molecular cause of DG hypoplasia within the cell not pinpointed"]},{"year":2023,"claim":"A human cerebral organoid model with CRISPR correction tied an AUTS2 missense variant causally to NPC proliferation/polarity defects and implicated WNT-β-catenin and cell-cycle dysregulation.","evidence":"Patient-derived cerebral organoids with CRISPR-Cas9 rescue and single-cell RNA-seq","pmids":["35802027"],"confidence":"High","gaps":["Direct molecular link between AUTS2 and WNT regulation not established here","Single variant studied"]},{"year":2024,"claim":"Isoform- and lineage-specific mouse genetics plus human organoid knockouts converged on AUTS2 as a negative regulator of WNT/β-catenin that promotes neuronal lineage commitment over choroid plexus fate and controls progenitor and dentate gyrus output.","evidence":"In utero electroporation, Calbindin1-lineage and isoform-specific conditional KO mice; CRISPR KO human organoids with luciferase reporters and WNT inhibitor rescue","pmids":["39174599","39013538","37816306"],"confidence":"Medium","gaps":["Mechanism by which AUTS2 represses WNT signaling not defined","Reconciliation of long- vs short-isoform contributions incomplete"]},{"year":2025,"claim":"AUTS2 was shown to cooperate with PRC2 to deposit H3K27me3 and repress Robo1 for intermediate progenitor division, and to directly bind RNA via eCLIP defining a chromatin-plus-RNA WNT7A regulatory axis.","evidence":"Auts2 mutant mice with H3K27me3 ChIP and Robo1 rescue; eCLIP-seq, ChIP-seq, and WNT7A rescue in human NPCs (one preprint)","pmids":["39815005","41278797"],"confidence":"High","gaps":["How AUTS2 partitions between PRC1-activating and PRC2-repressing roles is unresolved","eCLIP RNA-binding finding is from a preprint"]},{"year":null,"claim":"It remains unknown how AUTS2 is mechanistically partitioned between its cytoplasmic Rac1/actin role and its multiple, sometimes opposing nuclear roles (ncPRC1 activation, PRC2 repression, AWS/BMP, WNT suppression, RNA binding), and what determines which output dominates in a given cell type.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model coupling compartment, isoform, and complex choice","Direct structural basis of partner selection unknown","Causal hierarchy among WNT, BMP, and Polycomb effects not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,3,14,16,17]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,17,18]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[7,18]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[16,1,17]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1,4]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,17,4]},{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[1,17,15]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,5,6,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[8,13,18]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[5,6,11]}],"complexes":["ncPRC1.3/ncPRC1.5 (non-canonical PRC1)","AWS complex (AUTS2-WDR68-SKI)","PRC2"],"partners":["P300","WDR68","SKI","PCGF3","PCGF5","SF3B1","NRF1","RAC1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8WXX7","full_name":"Autism susceptibility gene 2 protein","aliases":[],"length_aa":1259,"mass_kda":139.0,"function":"Component of a Polycomb group (PcG) multiprotein PRC1-like complex, a complex class required to maintain the transcriptionally repressive state of many genes, including Hox genes, throughout development. PcG PRC1 complex acts via chromatin remodeling and modification of histones; it mediates monoubiquitination of histone H2A 'Lys-119', rendering chromatin heritably changed in its expressibility (PubMed:25519132). The PRC1-like complex that contains PCGF5, RNF2, CSNK2B, RYBP and AUTS2 has decreased histone H2A ubiquitination activity, due to the phosphorylation of RNF2 by CSNK2B (PubMed:25519132). As a consequence, the complex mediates transcriptional activation (PubMed:25519132). In the cytoplasm, plays a role in axon and dendrite elongation and in neuronal migration during embryonic brain development. 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Zmiz1 in mice leads to impaired cortical development and autistic-like behaviors","date":"2024-08-18","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.18.608498","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":37426,"output_tokens":6319,"usd":0.103531,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15337,"output_tokens":4635,"usd":0.09628,"stage2_stop_reason":"end_turn"},"total_usd":0.199811,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2014,\n      \"finding\": \"Cytoplasmic AUTS2 localizes not only in nuclei but also in the cytoplasm including growth cones of developing neurons (shown by immunohistochemistry and fractionation). Cytoplasmic AUTS2 activates Rac1 to induce lamellipodia but downregulates Cdc42 to suppress filopodia. Loss-of-function and rescue experiments showed that a cytoplasmic AUTS2-Rac1 pathway is required for cortical neuronal migration and neuritogenesis in the developing brain.\",\n      \"method\": \"Immunohistochemistry, subcellular fractionation, loss-of-function and rescue experiments in developing brain, Rho GTPase activity assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal localization by two orthogonal methods (IHC + fractionation), functional rescue experiments, GTPase activity measurements in single focused study\",\n      \"pmids\": [\"25533347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AUTS2 is a component of non-canonical PRC1 complexes (ncPRC1.3 and ncPRC1.5) that convert Polycomb repressive function to transcriptional activation. The HX repeat domain of AUTS2 is required for interaction with P300 (histone acetyltransferase). Mutations in the HX repeat domain disrupt the AUTS2-P300 interaction and cause misregulation of developmental genes. The transcription factor NRF1 is required for ncPRC1.3 recruitment to chromatin and plays an integral role in this neurodevelopmental transcriptional activation program. Loss of AUTS2 or mutation in its HX repeat domain curtails motor neuron differentiation of mouse embryonic stem cells.\",\n      \"method\": \"Co-immunoprecipitation, genomic/chromatin analyses, mouse embryonic stem cell differentiation assays, patient variant characterization, ChIP\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, functional rescue, patient variants with biochemical validation, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"34637754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WDR68 is an integral component of the PRC1-AUTS2 complex and is required for PRC1-AUTS2-mediated transcriptional activation. Deletion of Wdr68 in mouse embryonic stem cells causes defects in neuronal differentiation without affecting self-renewal, and downregulates many PRC1-AUTS2 target neuronal differentiation genes.\",\n      \"method\": \"Co-immunoprecipitation, mouse embryonic stem cell knockout, transcriptomic analysis (RNA-seq)\",\n      \"journal\": \"Stem cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP identifying complex component, KO with transcriptomic and functional readout, single lab\",\n      \"pmids\": [\"30448639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"AUTS2 protein isoforms differ in their interactions and transcriptional activities. Yeast two-hybrid screen identified splicing factor SF3B1 as an interactor of both long and short isoforms; Polycomb group proteins PCGF3 and PCGF5 interact exclusively with the long AUTS2 isoform. The first exons of the long AUTS2 isoform function as a transcriptional repressor, while the region constituting the short isoform acts as a transcriptional activator. PCGF3 expression levels influence the long AUTS2 isoform's ability to activate or repress transcription. Mouse ESCs with truncated AUTS2 (missing exons 12-20) show premature neuronal differentiation.\",\n      \"method\": \"Yeast two-hybrid screen, reporter transcription assays, mouse embryonic stem cell loss-of-function experiments\",\n      \"journal\": \"Molecular psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — yeast two-hybrid plus reporter assays plus cell-based functional experiments, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"30953002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Genome-wide ChIP-seq in mouse embryonic day 16.5 forebrains showed that Auts2 binds predominantly to promoters of genes highly expressed in the developing forebrain, consistent with a role in transcriptional activation. Auts2-bound non-promoter regions overlap with developing brain-associated enhancer marks. Auts2-marked sequences are enriched for neurodevelopmental transcription factor binding motifs (Pitx3, TCF3). Two functional brain enhancers near ASD-implicated genes NRXN1 and ATP2B2 are bound by Auts2.\",\n      \"method\": \"ChIP-seq, RNA-seq on mouse embryonic forebrains, functional enhancer assays\",\n      \"journal\": \"Translational psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP-seq with RNA-seq orthogonal validation, single lab, functional enhancer assays\",\n      \"pmids\": [\"25180570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AUTS2 specifically regulates excitatory synapse number in neurons. Auts2-deficient primary cultured neurons and Auts2 mutant forebrains show specifically increased excitatory synapses. Electrophysiological recordings confirmed increased excitatory synaptic inputs and increased c-fos expression in mutant brains, indicating enhanced brain excitability due to altered E/I balance. Auts2 mutant mice exhibited autistic-like behaviors including impaired social interaction and altered vocal communication.\",\n      \"method\": \"Conditional knockout mice, electrophysiology, immunostaining, c-fos expression analysis, behavioral assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple orthogonal cellular and electrophysiological readouts plus behavioral phenotype, single lab\",\n      \"pmids\": [\"32498016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"AUTS2 is required for Purkinje cell maturation in the cerebellum. Auts2 conditional knockout mice exhibited smaller and deformed cerebella containing immature-shaped Purkinje cells with reduced expression of Cacna1a. Auts2 cKO and knockdown experiments implicated AUTS2 in elimination and translocation of climbing fiber synapses and restriction of parallel fiber synapse numbers. Auts2 cKO mice exhibited behavioral impairments in motor learning and vocal communications.\",\n      \"method\": \"Conditional knockout mice, immunostaining, knockdown experiments, behavioral assays\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with multiple orthogonal cellular phenotype readouts (synaptic, molecular, behavioral), single lab\",\n      \"pmids\": [\"33305180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"AUTS2 associates with multiple proteins that regulate RNA transcription, splicing, localization, and stability in neonatal mouse cerebral cortex, identified by proteomics (mass spectrometry). AUTS2-containing protein complexes isolated from cortical tissue bound specific RNA transcripts as shown by RNA immunoprecipitation and sequencing (RIP-seq). Conditional excision of Auts2 exon 15 caused breathing abnormalities, neonatal lethality, dentate gyrus hypoplasia with agenesis of hilar mossy neurons, abnormal EEG spiking, and dysregulation of RNA transcripts normally associated with AUTS2.\",\n      \"method\": \"Proteomics/mass spectrometry (pull-down of binding partners), RNA immunoprecipitation and sequencing (RIP-seq), conditional knockout mice, EEG, histology\",\n      \"journal\": \"Cerebral cortex\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — proteomics identification of binding partners combined with RIP-seq demonstrating RNA binding, functional KO with multiple phenotypic readouts, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"34013328\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"AUTS2 together with WDR68 and SKI forms a novel protein complex (AWS) in neuronal progenitors, independent of PRC1, that promotes neuronal differentiation by inhibiting BMP signaling. The AWS complex recruits the CUL4 E3 ubiquitin ligase complex to mediate poly-ubiquitination and proteasomal degradation of phosphorylated SMAD1/5/9, thereby suppressing BMP signaling. Manipulation of the AWS complex in primary cortical neurons leads to aberrant BMP signaling and dysregulated neuronal gene expression.\",\n      \"method\": \"Co-immunoprecipitation (protein complex identification), genomic and biochemical analyses, ubiquitination assays, primary cortical neuron manipulation\",\n      \"journal\": \"Stem cell reviews and reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying novel complex, biochemical ubiquitination assays, in vivo neuronal validation, single lab\",\n      \"pmids\": [\"36258139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Knockdown of auts2 in zebrafish leads to smaller head size, neuronal reduction, and decreased mobility. The full-length and C-terminal AUTS2 isoforms both rescued microcephaly caused by auts2 suppression in zebrafish. Twenty-three functional zebrafish enhancers were identified for AUTS2, 10 of which were active in the brain, and three mouse brain enhancers were characterized that overlap with ASD-associated deletions.\",\n      \"method\": \"Zebrafish morpholino knockdown, rescue experiments with human AUTS2 isoforms, zebrafish and mouse enhancer assays (transient transgenics)\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino knockdown with isoform rescue in zebrafish, enhancer activity tested in two model organisms, single lab\",\n      \"pmids\": [\"23349641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Exonic deletions of AUTS2 cause syndromic intellectual disability. The C-terminal region of AUTS2 encodes an alternative isoform (with an alternative transcription start site in a 3' exon) expressed in human brain. Suppression of auts2 in zebrafish embryos caused microcephaly that could be rescued by either the full-length or the C-terminal isoform of AUTS2.\",\n      \"method\": \"Zebrafish morpholino knockdown, rescue with human AUTS2 isoforms, molecular characterization of isoforms\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform rescue in zebrafish with orthogonal patient genetic data, single lab\",\n      \"pmids\": [\"23332918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Deletion of Auts2 in mice causes postnatal dentate gyrus (DG) hypoplasia through a transcription repressor mechanism affecting neural cell migration in postnatal DG development. The SuM-DG-CA3 neural circuit is involved in social recognition and is disrupted in Auts2-deleted mice due to DG hypoplasia. Correction of DG-CA3 synaptic transmission pharmacologically, or chemo/optogenetic activation of the SuM-DG circuit, restored social recognition deficit.\",\n      \"method\": \"Auts2 conditional knockout mice, neural circuit tracing, optogenetics, chemogenetics, pharmacological rescue\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with multiple orthogonal rescue approaches (pharmacological, optogenetic, chemogenetic), circuit-level mechanism defined, single lab\",\n      \"pmids\": [\"35235353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"AUTS2 missense variant in a patient causes reduced cerebral organoid growth, deficits in neural progenitor cell (NPC) proliferation, and disrupted NPC polarity within ventricular zone-like regions. CRISPR-Cas9 correction of the variant rescued organoid growth and NPC proliferative deficits. Single-cell RNA sequencing revealed reduced G1/S transition gene expression and alterations in WNT-β-catenin signalling within proband NPCs.\",\n      \"method\": \"Human cerebral organoid model, CRISPR-Cas9 gene editing rescue, single-cell RNA sequencing\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — CRISPR rescue in human organoids with scRNA-seq mechanistic pathway identification, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"35802027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AUTS2 disruption in human cerebral organoids (via CRISPR/Cas9 knockout in human ESCs) reduces populations of cells committed to neuronal lineage and causes overabundance of cells resembling choroid plexus (ChP) cells. AUTS2 negatively regulates the WNT/β-catenin signaling pathway, demonstrated by overactivation in AUTS2-deficient organoids and in luciferase reporter cells lacking AUTS2. Treatment with a WNT inhibitor reversed overexpression of ChP genes and increased downregulated neuronal gene expression in AUTS2-deficient organoids.\",\n      \"method\": \"CRISPR/Cas9 knockout in human ESCs, cerebral organoid culture, transcriptomic analysis, luciferase reporter assays, WNT inhibitor pharmacological rescue\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — KO in human organoids with luciferase reporter biochemical validation and pharmacological rescue, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"39174599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In T-cell leukemia, AUTS2 protein interacts with polycomb repressor complex 1 subtype 5 (PRC1.5), converting this complex into a transcriptional activator. AUTS2 activated transcription of NKL homeobox gene MSX1, while PCGF5 repressed it. AUTS2 expression in T-ALL is activated by IL7-IL7R-STAT5 signalling and MEF2C.\",\n      \"method\": \"Gene expression profiling, forced expression and pharmacological inhibition, H3K27me3 analysis, functional transcriptional assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional assays with forced expression and inhibition, single lab, indirect evidence for PRC1.5 complex function\",\n      \"pmids\": [\"27322685\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Repeated cocaine administration specifically increased Auts2 gene expression in D2-type medium spiny neurons in the nucleus accumbens (but not other regions), an effect seen in male but not female mice. Chromosomal looping connecting Auts2 to the Caln1 gene locus (bypassing 1524 kb of linear genome) was disrupted after repeated cocaine exposure, resulting in increased expression of both genes. Cocaine exposure reduces binding of CTCF (chromosomal scaffolding protein) and increases histone and DNA methylation at the Auts2-Caln1 loop base. Cell type-specific overexpression of Auts2 in D2-type medium spiny neurons promotes cocaine reward.\",\n      \"method\": \"Chromosome conformation capture (3C, 4C), FACS cell-type sorting, viral-mediated cell-type-specific overexpression, behavioral cocaine reward assays\",\n      \"journal\": \"Biological psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — 3C/4C chromatin conformation, cell-type specific OE with behavioral readout, single lab, multiple methods\",\n      \"pmids\": [\"28577753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Auts2 protein is localized in the nuclei of neurons and some neuronal progenitors in the developing mouse brain, as shown by immunohistochemistry and western blotting. Auts2 mRNA and protein are highly expressed in developing cerebral cortex, cerebellum (including Purkinje cells and deep nuclei), frontal cortex, hippocampus, dorsal thalamus, olfactory bulb, inferior colliculus, and substantia nigra. Auts2 protein expression colocalizes with Tbr1, a transcription factor specific for postmitotic projection neurons.\",\n      \"method\": \"Immunohistochemistry, in situ hybridization, western blotting in developing mouse brain\",\n      \"journal\": \"Gene expression patterns\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — nuclear localization by two orthogonal methods (IHC + western blot), colocalization with neuron-specific marker, single lab\",\n      \"pmids\": [\"19948250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AUTS2 interacts with Polycomb complex PRC2 and cooperates with it to promote intermediate progenitor cell (IPC) division in the developing cortex. AUTS2 primarily represses transcription of target genes (including Robo1) in IPCs, with regions around transcriptional start sites of AUTS2 targets enriched for H3K27me3. Loss of AUTS2 reduces H3K27me3 at target loci and increases Robo1 expression, suppressing IPC division and causing fewer upper-layer neurons and microcephaly.\",\n      \"method\": \"Mouse Auts2 mutants, chromatin profiling (H3K27me3 ChIP), transcriptomics, Co-immunoprecipitation (AUTS2-PRC2 interaction), in vivo histological analysis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — Co-IP demonstrating AUTS2-PRC2 interaction, chromatin profiling with transcriptomic validation, mechanistic rescue by target gene, single lab but multiple rigorous orthogonal methods\",\n      \"pmids\": [\"39815005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AUTS2 directly binds RNA in human neural progenitor cells (NPCs), as demonstrated by eCLIP-seq, defining its direct RNA interactome for the first time. AUTS2 also binds chromatin targets (ChIP-seq). AUTS2 knockdown in NPCs leads to widespread gene expression changes, impaired cell proliferation, migration, and neurite outgrowth. Integrated analysis revealed downregulation of WNT pathway genes including WNT7A among targets directly bound by AUTS2 at both chromatin and RNA levels. Supplementation with WNT7A rescued cellular phenotypes in AUTS2-deficient NPCs.\",\n      \"method\": \"eCLIP-seq (direct RNA binding), ChIP-seq (chromatin binding), siRNA knockdown in human NPCs, WNT7A rescue experiments\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — eCLIP-seq directly demonstrates RNA binding, ChIP-seq for chromatin, functional rescue with WNT7A; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"41278797\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"AUTS2 is expressed in neural progenitor cells during peak neurogenesis. Upregulation of AUTS2 via in utero electroporation in developing cerebral cortex increased basal progenitor numbers and neurons. Loss of AUTS2-l (long isoform) in Calbindin 1-expressing cell lineages is sufficient to yield learning/memory deficits, hyperactivity, and abnormal dentate gyrus granule cell maturation.\",\n      \"method\": \"In utero electroporation, conditional knockout mice targeting Calbindin 1 lineage, immunofluorescence, cell tracing and sorting, transcriptomic profiling\",\n      \"journal\": \"Journal of advanced research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in utero electroporation gain-of-function and conditional KO with cell-type and lineage specificity, multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"39013538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Brain-wide ablation of the AUTS2 long isoform (AUTS2-l) generates specific subsets of behavioral and brain phenotypes (dominant hyperactivity and repetitive behaviors) distinct from those caused by mutations disrupting both isoforms. Hundreds of putative direct AUTS2-l target genes were identified in postnatal brain. AUTS2-l ablation restricted to Calbindin 1-expressing cell lineages is sufficient for learning/memory deficits and hyperactivity with abnormal dentate gyrus granule cell maturation.\",\n      \"method\": \"Isoform-specific conditional knockout mice, behavioral phenotyping, brain gene expression profiling, cell-lineage-specific conditional KO\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — isoform-specific and cell-type-specific KO with multiple behavioral and molecular readouts, single lab\",\n      \"pmids\": [\"37816306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"AUTS2 in the nucleus accumbens (NAc) suppresses heroin-induced locomotor sensitization. Chronic heroin administration specifically decreased AUTS2 mRNA and protein expression in the NAc but not caudate-putamen. Lentiviral-AUTS2-shRNA knockdown in the NAc enhanced heroin-induced locomotor sensitization, while AUTS2 overexpression attenuated the locomotor-stimulant effects of heroin.\",\n      \"method\": \"Lentiviral shRNA knockdown and overexpression in mouse NAc, behavioral locomotor sensitization assays, qRT-PCR, western blot\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional manipulation (KD and OE) with behavioral readout, region-specific effect confirmed, single lab\",\n      \"pmids\": [\"27423627\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AUTS2 is a multifunctional neurodevelopmental regulator with both nuclear and cytoplasmic roles: in the nucleus, it acts as a component of non-canonical PRC1 complexes (ncPRC1.3/ncPRC1.5) where its HX repeat domain recruits P300 to activate transcription of neuronal genes, interacts with PRC2 to repress targets (e.g., Robo1) and promote intermediate progenitor division, and directly binds both chromatin and RNA to regulate gene expression in neural progenitors; in the cytoplasm, it activates Rac1 and suppresses Cdc42 to regulate actin cytoskeletal dynamics required for neuronal migration and neuritogenesis; postnatally, it suppresses excitatory synapse number to maintain E/I balance, and it is required for Purkinje cell maturation, dentate gyrus development, and cerebellar circuit formation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AUTS2 is a multifunctional neurodevelopmental regulator that acts in both the nucleus and cytoplasm to control neuronal differentiation, migration, and circuit formation [#0, #16]. In the nucleus, AUTS2 is a context-dependent transcriptional switch within Polycomb machinery: as a component of non-canonical PRC1 complexes (ncPRC1.3/ncPRC1.5), its HX repeat domain recruits the histone acetyltransferase P300 to convert Polycomb repression into activation of neurodevelopmental genes, with NRF1 directing complex recruitment to chromatin and patient HX-domain mutations disrupting the P300 interaction and gene regulation [#1, #16]; conversely, AUTS2 also cooperates with PRC2 to deposit H3K27me3 and repress targets such as Robo1, promoting intermediate progenitor division and cortical neuron output [#17]. Its activity is isoform-dependent, with long and short isoforms exerting opposing repressive versus activating effects and engaging distinct partners including SF3B1 and PCGF3/PCGF5 [#3]. Beyond canonical Polycomb roles, AUTS2 forms an AWS complex with WDR68 and SKI that recruits the CUL4 ubiquitin ligase to degrade phosphorylated SMAD1/5/9 and suppress BMP signaling [#8], and it directly binds both chromatin and RNA in neural progenitors to regulate WNT pathway genes including WNT7A, whose supplementation rescues proliferation, migration, and neurite outgrowth defects [#18, #13]. In the cytoplasm, AUTS2 activates Rac1 and downregulates Cdc42 to remodel the actin cytoskeleton during cortical neuronal migration and neuritogenesis [#0]. Functionally, AUTS2 controls neural progenitor proliferation and lineage commitment, restrains excitatory synapse number to maintain E/I balance, and is required for Purkinje cell maturation and dentate gyrus development underlying social recognition and motor learning [#5, #6, #11, #12]. Exonic deletions and missense variants of AUTS2 cause syndromic intellectual disability and autism-like phenotypes [#10, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing where AUTS2 protein resides and which cells express it was the first step toward assigning function, showing it is a nuclear protein enriched in developing forebrain, cerebellum, and postmitotic projection neurons.\",\n      \"evidence\": \"Immunohistochemistry, in situ hybridization, and western blotting in developing mouse brain with Tbr1 co-localization\",\n      \"pmids\": [\"19948250\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular function assigned\", \"Nuclear-only view incomplete given later cytoplasmic findings\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linking AUTS2 dosage to brain size and patient disease established it as a causal neurodevelopmental gene and defined functional isoforms plus distant enhancers.\",\n      \"evidence\": \"Zebrafish morpholino knockdown with human isoform rescue, patient exonic deletion analysis, and enhancer transgenic assays\",\n      \"pmids\": [\"23349641\", \"23332918\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of microcephaly not resolved\", \"Isoform-specific molecular activities undefined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two studies split AUTS2 function across compartments: a cytoplasmic Rac1/Cdc42 actin-regulatory role in migration/neuritogenesis, and a nuclear promoter/enhancer-binding role in transcriptional activation.\",\n      \"evidence\": \"Subcellular fractionation, Rho GTPase activity assays, rescue in developing brain; ChIP-seq/RNA-seq in mouse forebrain with enhancer assays\",\n      \"pmids\": [\"25533347\", \"25180570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism coupling cytoplasmic and nuclear pools unknown\", \"Direct GEF/GAP partners for Rac1/Cdc42 control not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"AUTS2 was placed inside non-canonical PRC1 as a converter of Polycomb repression to activation, and shown to be regulated in addiction circuitry, broadening its functional context.\",\n      \"evidence\": \"Transcriptional and H3K27me3 assays in T-ALL; lentiviral knockdown/overexpression in mouse nucleus accumbens with locomotor behavior\",\n      \"pmids\": [\"27322685\", \"27423627\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"PRC1.5 mechanism in T-ALL was indirect\", \"Generalizability of activator role beyond leukemia unclear at this stage\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defining WDR68 as an integral subunit of the PRC1-AUTS2 complex showed the complex requires specific cofactors for transcriptional activation and neuronal differentiation.\",\n      \"evidence\": \"Reciprocal Co-IP and Wdr68 knockout in mouse ESCs with RNA-seq\",\n      \"pmids\": [\"30448639\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"WDR68 contribution to activation mechanism not mechanistically dissected\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Isoform-resolved interactome and reporter analysis explained how AUTS2 can be both repressor and activator: long-isoform first exons repress while the short region activates, with PCGF3 tuning the balance.\",\n      \"evidence\": \"Yeast two-hybrid screen, reporter transcription assays, and truncated-AUTS2 mouse ESC experiments\",\n      \"pmids\": [\"30953002\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of SF3B1 interaction not established\", \"How PCGF3 levels are physiologically set is unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Conditional knockouts revealed concrete postnatal functions: restraint of excitatory synapse number for E/I balance and requirement for Purkinje cell maturation and cerebellar synapse refinement.\",\n      \"evidence\": \"Conditional KO mice with electrophysiology, immunostaining, c-fos analysis, and behavioral assays\",\n      \"pmids\": [\"32498016\", \"33305180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular targets driving synaptic and Purkinje phenotypes not fully mapped\", \"Link between transcriptional role and synaptic phenotypes incomplete\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"AUTS2 was shown to be an RNA-associated regulator and an HX-domain-dependent P300 recruiter, integrating a direct RNA-binding role with the ncPRC1.3/1.5 activation mechanism validated by patient variants.\",\n      \"evidence\": \"Proteomics and RIP-seq from cortex with conditional KO phenotyping; Co-IP, ChIP, ESC differentiation, and patient variant biochemistry\",\n      \"pmids\": [\"34013328\", \"34637754\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether AUTS2 binds RNA directly versus via partners not resolved here\", \"Functional consequence of RNA binding undefined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Two studies expanded AUTS2's reach beyond Polycomb: a PRC1-independent AWS complex degrading phospho-SMAD1/5/9 to suppress BMP signaling, and a dentate gyrus circuit mechanism underlying social recognition.\",\n      \"evidence\": \"Co-IP and ubiquitination assays in neuronal progenitors; conditional KO with circuit tracing, optogenetic, chemogenetic, and pharmacological rescue\",\n      \"pmids\": [\"36258139\", \"35235353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"AWS complex stoichiometry and CUL4 recruitment mechanism not detailed\", \"Direct molecular cause of DG hypoplasia within the cell not pinpointed\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"A human cerebral organoid model with CRISPR correction tied an AUTS2 missense variant causally to NPC proliferation/polarity defects and implicated WNT-β-catenin and cell-cycle dysregulation.\",\n      \"evidence\": \"Patient-derived cerebral organoids with CRISPR-Cas9 rescue and single-cell RNA-seq\",\n      \"pmids\": [\"35802027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular link between AUTS2 and WNT regulation not established here\", \"Single variant studied\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Isoform- and lineage-specific mouse genetics plus human organoid knockouts converged on AUTS2 as a negative regulator of WNT/β-catenin that promotes neuronal lineage commitment over choroid plexus fate and controls progenitor and dentate gyrus output.\",\n      \"evidence\": \"In utero electroporation, Calbindin1-lineage and isoform-specific conditional KO mice; CRISPR KO human organoids with luciferase reporters and WNT inhibitor rescue\",\n      \"pmids\": [\"39174599\", \"39013538\", \"37816306\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which AUTS2 represses WNT signaling not defined\", \"Reconciliation of long- vs short-isoform contributions incomplete\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"AUTS2 was shown to cooperate with PRC2 to deposit H3K27me3 and repress Robo1 for intermediate progenitor division, and to directly bind RNA via eCLIP defining a chromatin-plus-RNA WNT7A regulatory axis.\",\n      \"evidence\": \"Auts2 mutant mice with H3K27me3 ChIP and Robo1 rescue; eCLIP-seq, ChIP-seq, and WNT7A rescue in human NPCs (one preprint)\",\n      \"pmids\": [\"39815005\", \"41278797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AUTS2 partitions between PRC1-activating and PRC2-repressing roles is unresolved\", \"eCLIP RNA-binding finding is from a preprint\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how AUTS2 is mechanistically partitioned between its cytoplasmic Rac1/actin role and its multiple, sometimes opposing nuclear roles (ncPRC1 activation, PRC2 repression, AWS/BMP, WNT suppression, RNA binding), and what determines which output dominates in a given cell type.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model coupling compartment, isoform, and complex choice\", \"Direct structural basis of partner selection unknown\", \"Causal hierarchy among WNT, BMP, and Polycomb effects not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 3, 14, 16, 17]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 17, 18]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [7, 18]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [16, 1, 17]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 17, 4]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 17, 15]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 5, 6, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [8, 13, 18]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [5, 6, 11]}\n    ],\n    \"complexes\": [\"ncPRC1.3/ncPRC1.5 (non-canonical PRC1)\", \"AWS complex (AUTS2-WDR68-SKI)\", \"PRC2\"],\n    \"partners\": [\"P300\", \"WDR68\", \"SKI\", \"PCGF3\", \"PCGF5\", \"SF3B1\", \"NRF1\", \"Rac1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}