{"gene":"SACK1H","run_date":"2026-06-10T07:46:29","timeline":{"discoveries":[{"year":2008,"finding":"Nonsense mutations in FAM83H (R325X and Q398X) cause autosomal dominant hypocalcified amelogenesis imperfecta, establishing FAM83H as required for proper dental enamel calcification.","method":"Genetic linkage and mutation analysis with cosegregation in affected families","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across multiple independent families and labs, cosegregation confirmed","pmids":["18252228"],"is_preprint":false},{"year":2008,"finding":"All ADHCAI-causing FAM83H mutations are nonsense mutations in the last exon that delete between 503 and 883 amino acids from the C-terminus, establishing that the large C-terminal portion of FAM83H is required for enamel calcification.","method":"Mutation screening and sequencing of four kindreds with ADHCAI","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple independent families, replicated finding across labs","pmids":["18484629"],"is_preprint":false},{"year":2009,"finding":"FAM83H (Fam83h) protein localizes to perinuclear vesicles in the vicinity of the Golgi apparatus in HEK293 and HeLa cells, and is not secreted (lacks signal peptide), establishing it as an intracellular protein.","method":"GFP fusion protein expression and live-cell fluorescence imaging in HEK293 and HeLa cells","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization by GFP imaging, single lab, two cell lines","pmids":["19828885"],"is_preprint":false},{"year":2010,"finding":"Truncation mutations (R325X, W460X, Q677X) cause FAM83H to relocalize predominantly to the nucleus, whereas wild-type and p.E694X mutant FAM83H localizes to the cytoplasm in HEK293T cells, linking nuclear mistargeting of truncated FAM83H to severe generalized enamel phenotype.","method":"GFP fusion protein transfection and fluorescence microscopy in HEK293T cells","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment, multiple mutants tested, single lab","pmids":["21118793"],"is_preprint":false},{"year":2013,"finding":"FAM83H regulates the filamentous state of keratins in epithelial cells: FAM83H knockdown induces keratin filament bundling, while overexpression disassembles keratin filaments. The N-terminal region of FAM83H interacts with CK-1α and the C-terminal region interacts with keratins, suggesting FAM83H tethers CK-1α to keratins.","method":"siRNA knockdown, overexpression, co-immunoprecipitation, immunofluorescence in colorectal cancer cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus functional KD/OE with defined phenotype, independently replicated in subsequent papers","pmids":["23902688"],"is_preprint":false},{"year":2013,"finding":"CK-1α inhibition phenocopies FAM83H knockdown (causes keratin filament bundling) and reverses keratin filament disassembly induced by FAM83H overexpression, establishing that CK-1α kinase activity mediates FAM83H-dependent keratin cytoskeleton reorganization.","method":"CK-1α pharmacological inhibition, epistasis analysis in colorectal cancer cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic/pharmacological epistasis with defined cellular phenotype, replicated in multiple subsequent studies","pmids":["23902688"],"is_preprint":false},{"year":2015,"finding":"Fam83h knockout mice show no dental enamel defects, but Fam83h truncation causes altered subcellular localization of CK1. FAM83H dimerizes through its N-terminal PLD-like (DUF1669) domain, and CK1 interacts with FAM83H via an F270-X-X-X-F274-X-X-X-F278 motif within the PLD-like domain. CK1 can phosphorylate FAM83H in vitro, with phosphorylation sites in the C-terminus.","method":"Fam83h knockout/lacZ knockin mouse model; in vitro pull-down assays; in vitro kinase assay; LacZ reporter expression","journal":"Molecular genetics & genomic medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay, pull-down, and mouse model with multiple orthogonal methods in one study","pmids":["26788537"],"is_preprint":false},{"year":2015,"finding":"Fam83h null mice have no enamel phenotype, supporting a neomorphic (gain-of-function) rather than haploinsufficiency mechanism for ADHCAI caused by FAM83H truncation mutations.","method":"Fam83h knockout mouse characterization (enamel microhardness, histology, micro-CT)","journal":"Molecular genetics & genomic medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — null mouse model with rigorous enamel phenotyping, finding replicated in subsequent truncation knock-in models","pmids":["26788537"],"is_preprint":false},{"year":2016,"finding":"FAM83H localizes on keratin filaments preferentially around the nucleus extending to cell-cell junctions in ameloblastoma cells and mouse ameloblasts in vivo. AI-causing truncated FAM83H prevents desmosomal proteins from localizing to cell-cell junctions, and this effect depends on the truncated protein's binding to and inhibition of CK-1.","method":"Immunofluorescence in human ameloblastoma cell lines and mouse tissue; overexpression/knockdown/AI-mutant transfection; CK-1 inhibitor D4476","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (IF, KD, OE, mutant, pharmacological inhibition), in vivo and in vitro","pmids":["27222304"],"is_preprint":false},{"year":2016,"finding":"CK1α (and CK1δ/ε) is recruited to nuclear speckles by FAM83H together with the scaffold protein SON; FAM83H and CK1α localize to nuclear speckles in cells lacking simple epithelial keratins, and knockdown of FAM83H or SON delocalizes CK1 from nuclear speckles.","method":"siRNA knockdown, interactome analysis (MS), immunofluorescence in colorectal cancer cells","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS interactome plus siRNA epistasis plus IF, multiple orthogonal methods","pmids":["27681590"],"is_preprint":false},{"year":2017,"finding":"MYC binds to the promoter of FAM83H and promotes its transcription, as demonstrated by chromatin immunoprecipitation assay and dual-luciferase reporter assay in hepatic tumor cells.","method":"Chromatin immunoprecipitation (ChIP), dual-luciferase reporter assay, Tet-O-MYC mouse model hepatic cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP + luciferase reporter, single lab, two orthogonal methods","pmids":["28607447"],"is_preprint":false},{"year":2018,"finding":"Fam83h mutation (c.1186C>T) alters the localization of Fam83h, CK1α, and β-catenin in LS8 ameloblast cells, inhibits mineralization, and downregulates expression of mineralization factors. Pyrvinium pamoate (Wnt/β-catenin inhibitor) rescues the inhibited mineralization, establishing that Fam83h mutation activates Wnt/β-catenin signaling to inhibit ameloblast mineralization.","method":"Immunoprecipitation, western blot, immunofluorescence, ALP activity assay, Wnt pathway inhibitor rescue in LS8 cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, IF, pharmacological rescue, single lab","pmids":["29709481"],"is_preprint":false},{"year":2019,"finding":"FAM83H directly interacts with β-catenin by immunoprecipitation, and FAM83H knockdown decreases β-catenin protein but not mRNA, increases β-catenin ubiquitination and proteasomal degradation, while overexpression stabilizes β-catenin. This establishes FAM83H as a scaffold that stabilizes β-catenin by preventing its proteasomal degradation in osteosarcoma cells.","method":"Co-immunoprecipitation, knockdown/overexpression, western blot, ubiquitination assay in osteosarcoma cells","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus mRNA/protein discordance, single lab","pmids":["31215499"],"is_preprint":false},{"year":2019,"finding":"Fam83h truncation (p.Tyr297*) knock-in mice exhibit enamel defects (hypoplastic enamel, rough surfaces, altered enamel rod orientation), whereas null mice do not, confirming a neomorphic gain-of-function mechanism for ADHCAI truncation mutations.","method":"CRISPR/Cas9 knock-in mouse model; micro-CT, SEM, histology, microhardness measurement","journal":"Molecular genetics & genomic medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — two mouse models directly compared (null vs. truncation knock-in), multiple phenotyping methods","pmids":["31060110"],"is_preprint":false},{"year":2020,"finding":"FAM83H interacts with NCK1/2 tyrosine kinase adaptor proteins, mediated by proline-rich motifs in the C-terminus of FAM83H specifically binding the second and third SH3 domains of NCK1/2. AI mutant truncated FAM83H proteins lose this interaction while retaining interaction with CK1 isoforms. AI mutant FAM83H acquires nuclear localization and recruits CK1 to the nucleus where CK1 retains kinase activity.","method":"Co-immunoprecipitation, domain deletion mapping, co-localization, TurboID proximity labeling in cell lines","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with domain mapping, proximity labeling, multiple orthogonal methods in one study","pmids":["32289446"],"is_preprint":false},{"year":2020,"finding":"FAM83H, SCRIB, and β-catenin form a protein complex (demonstrated by immunoprecipitation), and knockdown of either FAM83H or SCRIB accelerates proteasomal degradation of β-catenin in gastric cancer cells.","method":"Co-immunoprecipitation, knockdown experiments, western blot in gastric cancer cells","journal":"Aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP showing trimeric complex plus functional KD, single lab","pmids":["32564009"],"is_preprint":false},{"year":2020,"finding":"FAM83H interacts with SEC16A, a component of the COPII complex at ER exit sites, with the interaction mediated by the middle part (amino acids 287–657) of mouse FAM83H, suggesting a role for FAM83H in ER-to-Golgi vesicle trafficking and protein secretion.","method":"In vitro pull-down studies with overexpressed FAM83H proteins in HEK293 cells","journal":"Journal of dental research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single pull-down interaction, domain mapping, single lab","pmids":["33034243"],"is_preprint":false},{"year":2021,"finding":"FAM83H knockdown in cutaneous SCC cells enhances migration and invasion, while overexpression decreases both. FAM83H forms a complex with TRIM29 and keratins (by immunoprecipitation), and FAM83H knockdown alters keratin distribution and solubility.","method":"siRNA knockdown, overexpression, immunoprecipitation, immunofluorescence, migration/invasion assays, in vivo metastasis model","journal":"Journal of dermatological science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional assays with defined phenotype, single lab","pmids":["34657752"],"is_preprint":false},{"year":2022,"finding":"The conserved C-terminal residues 1134–1139 of FAM83H are required for its localization to and recruitment of CK1 to the keratin cytoskeleton. Deletion of these residues causes FAM83H and CK1 to translocate to nuclear speckles instead. Amino acid residues 1–603 contain the region responsible for CK1 recruitment to nuclear speckles.","method":"Deletion mutant transfection, immunofluorescence in cell lines","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic deletion mapping with IF, single lab, defined residues","pmids":["35821396"],"is_preprint":false},{"year":2022,"finding":"Truncated FAM83H (p.Q396*) disrupts the FAM83H-CK1α-keratin 14-amelogenin complex in ameloblasts, leading to retention of amelogenin (AMELX) in the cytoplasm, decreased iron transport (reduced TFRC and SLC40A1), and decreased desmoglein 3 expression.","method":"CRISPR/Cas9 knock-in mouse (Fam83hQ396*/Q396*), immunofluorescence, EDS, Co-IP/complex analysis, mRNA sequencing","journal":"Bone","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse model combined with Co-IP complex analysis, mRNA sequencing, and multiple phenotypic readouts","pmids":["36272714"],"is_preprint":false},{"year":2022,"finding":"FAM83H knockdown in HAT-7 ameloblast cells decreases expression of amelogenin, enamelin, and kallikrein-related peptidase-4, while ameloblastin expression increases, establishing FAM83H as a regulator of enamel matrix protein secretion.","method":"siRNA knockdown in HAT-7 cells, qRT-PCR and western blot","journal":"Clinical oral investigations","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined molecular phenotype with KD in relevant cell type, single lab","pmids":["36318336"],"is_preprint":false},{"year":2023,"finding":"Fam83h mutation (p.Q396*) in osteoblasts increases cytoplasmic CK1α levels (as part of the β-catenin degradation complex), promotes β-catenin degradation, reduces β-catenin nuclear translocation, inhibits Wnt/β-catenin signaling, and impairs osteoblast differentiation, causing mandible underdevelopment. Ck1α siRNA or Wnt agonists partially rescue this mineralization defect.","method":"Fam83hQ396*/Q396* knock-in mouse model; primary osteoblast culture; western blot; CK1α siRNA and Wnt agonist rescue experiments","journal":"Bone","confidence":"High","confidence_rationale":"Tier 2 / Strong — mouse model with primary cells, pharmacological and genetic rescue, multiple orthogonal methods","pmids":["37028581"],"is_preprint":false},{"year":2025,"finding":"The DUF1669 domain (residues 17–281) of FAM83H is required but not sufficient for nuclear speckle localization. Deletions within residues 1–300 attenuate or abolish nuclear speckle localization. Some ADHCAI-truncated FAM83H proteins containing the DUF1669 domain do not localize to nuclear speckles, indicating additional sequence requirements.","method":"Systematic deletion and truncation mutant transfection, immunofluorescence in cell lines","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic domain mapping with IF, single lab, multiple mutants","pmids":["40210674"],"is_preprint":false},{"year":2025,"finding":"FNDC3B interacts with FAM83H (by Co-IP) and inhibits its ubiquitin-proteasome degradation, thereby stabilizing FAM83H protein. FNDC3B promotes gastric cancer metastasis via the FNDC3B/FAM83H/Snail/EMT axis.","method":"Co-immunoprecipitation, LC-MS/MS, rescue experiments, in vitro and in vivo functional assays","journal":"Cellular & molecular biology letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus MS plus rescue experiments, single lab","pmids":["40450207"],"is_preprint":false},{"year":2025,"finding":"TRIM29 interacts with FAM83H and stabilizes it by reducing its ubiquitination and degradation, thereby redistributing cellular keratins and activating the NF-κB pathway and PLXNB2 upregulation to promote colorectal cancer liver metastasis.","method":"Co-immunoprecipitation, multi-omics sequencing, in vitro functional assays, in vivo metastasis models","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional rescue, multi-omics, single lab","pmids":["40389046"],"is_preprint":false},{"year":2025,"finding":"In Fam83h-deficient mice, FAM83H expression is confined to thymic epithelial cells (TECs); its deficiency disrupts thymic architecture and causes a severe block in DN3 T cell expansion. Single-cell transcriptomics reveals reduced Foxn1 and its downstream targets in cortical TECs, suggesting FAM83H, in coordination with CK1, is required for cTEC maturation.","method":"Fam83h knockout mouse model (Fam83h-/-) and CK1-binding domain deletion (Fam83hΔ87/Δ87); single-cell RNA-seq; histological analysis of thymus","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two independent mouse models, single-cell transcriptomics, single lab","pmids":["41546142"],"is_preprint":false},{"year":2024,"finding":"In an ARSACS cellular model, CK1α, FAM83H, and FAM83B are upregulated and co-localize at sites of intermediate filament (neurofilament) bundling. CK1α inhibition or knockdown of FAM83H/FAM83B causes neurofilament bundling, while CK1α activation (SSTC3) only partially remediates bundling, suggesting FAM83H-CK1α axis regulates neurofilament dynamics.","method":"CRISPR knockdown, pharmacological CK1α inhibition/activation, immunofluorescence, co-localization in ARSACS patient fibroblasts and Sacs-/- cerebellum","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 3 / Weak — preprint, single lab, localization and KD without full mechanistic reconstitution","pmids":["bio_10.1101_2024.10.01.616079"],"is_preprint":true},{"year":2016,"finding":"Fluoride exposure downregulates Fam83h expression in LS8 ameloblast-like cells via suppression of JNK and P38 (MAPK) phosphorylation, identifying the P38/JNK signaling pathway as a regulator of Fam83h expression in ameloblasts.","method":"Western blot and qRT-PCR with fluoride and MAPK inhibitor treatment in LS8 cells; ALP activity assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological dissection with multiple inhibitors, defined molecular readout, single lab","pmids":["26876574"],"is_preprint":false}],"current_model":"FAM83H is a scaffold protein that recruits casein kinase 1 (CK1) isoforms to the keratin cytoskeleton (via conserved C-terminal residues 1134–1139 and the N-terminal DUF1669/PLD-like domain) or to nuclear speckles (via SON), thereby regulating keratin filament organization and desmosome formation; it also binds NCK1/2 adaptor proteins through C-terminal proline-rich motifs; disease-causing truncation mutations cause a neomorphic gain-of-function by mislocalizing CK1 to the nucleus and disrupting the FAM83H-CK1α-keratin-amelogenin complex, impairing enamel matrix secretion and activating Wnt/β-catenin signaling, while in non-epithelial contexts FAM83H stabilizes β-catenin from proteasomal degradation and is itself stabilized by TRIM29 and FNDC3B through inhibition of ubiquitination."},"narrative":{"mechanistic_narrative":"FAM83H is an intracellular scaffold protein that controls the subcellular targeting of casein kinase 1 (CK1) isoforms, thereby coupling kinase activity to the keratin intermediate filament cytoskeleton and to enamel and bone development [PMID:23902688, PMID:26788537]. It binds CK1α through an F270-X-X-X-F274-X-X-X-F278 motif in its N-terminal PLD-like (DUF1669) domain and engages keratins through its C-terminus, tethering CK1α to keratin filaments and regulating their filamentous state—knockdown causes filament bundling while overexpression drives disassembly in a manner dependent on CK1α kinase activity [PMID:23902688, PMID:26788537]. The conserved C-terminal residues 1134–1139 dictate localization to the keratin cytoskeleton; their loss redirects FAM83H and CK1 to nuclear speckles, where recruitment depends on the scaffold protein SON and the N-terminal region (residues 1–603/DUF1669) [PMID:27681590, PMID:35821396, PMID:40210674]. FAM83H additionally binds NCK1/2 adaptors via C-terminal proline-rich motifs that engage their SH3 domains [PMID:32289446]. FAM83H also forms complexes with β-catenin and SCRIB and stabilizes β-catenin against ubiquitin-mediated proteasomal degradation [PMID:31215499, PMID:32564009]. Truncating mutations cause autosomal dominant hypocalcified amelogenesis imperfecta through a neomorphic gain of function rather than haploinsufficiency: null mice have normal enamel whereas truncation knock-in mice phenocopy the human disease, because truncated FAM83H mislocalizes to the nucleus, retains CK1 binding, and disrupts the FAM83H-CK1α-keratin-amelogenin complex required for enamel matrix protein secretion [PMID:18252228, PMID:26788537, PMID:31060110, PMID:36272714]. In mineralizing cells this mislocalization dysregulates Wnt/β-catenin signaling and impairs ameloblast and osteoblast differentiation [PMID:29709481, PMID:37028581]. Beyond epithelia, FAM83H is required for cortical thymic epithelial cell maturation and DN3 thymocyte expansion in coordination with CK1 [PMID:41546142].","teleology":[{"year":2008,"claim":"Linking FAM83H to a Mendelian enamel disorder established its physiological requirement, answering whether the gene had an essential developmental function.","evidence":"Genetic linkage and mutation cosegregation in ADHCAI families, identifying C-terminal nonsense mutations in the last exon","pmids":["18252228","18484629"],"confidence":"High","gaps":["Did not reveal the molecular function of the protein","Did not distinguish loss- vs gain-of-function mechanism","C-terminal region requirement was inferred from mutation position only"]},{"year":2009,"claim":"Establishing FAM83H as a non-secreted intracellular protein near the Golgi reframed it away from an extracellular enamel matrix component.","evidence":"GFP fusion live-cell imaging in HEK293 and HeLa cells","pmids":["19828885"],"confidence":"Medium","gaps":["Perinuclear localization not linked to a molecular activity","Single lab, overexpression-based"]},{"year":2010,"claim":"Showing that disease truncations mislocalize FAM83H to the nucleus introduced subcellular mistargeting as a candidate disease mechanism.","evidence":"GFP fusion microscopy of multiple truncation mutants in HEK293T cells","pmids":["21118793"],"confidence":"Medium","gaps":["Nuclear mistargeting not yet connected to a partner or kinase","Overexpression artifact not excluded"]},{"year":2013,"claim":"Identifying FAM83H as a CK1α-keratin tether defined its core molecular activity as a kinase-cytoskeleton scaffold.","evidence":"Reciprocal Co-IP, siRNA knockdown/overexpression with keratin phenotype, and CK1α pharmacological epistasis in colorectal cancer cells","pmids":["23902688"],"confidence":"High","gaps":["CK1α phosphorylation substrates on keratins not identified","Did not map precise interaction motifs"]},{"year":2015,"claim":"Null versus truncation mouse models resolved the disease mechanism as neomorphic gain-of-function and defined the CK1-binding motif and dimerization domain.","evidence":"Fam83h knockout/lacZ knockin mouse, in vitro pull-down, and in vitro kinase assay mapping the F270/F274/F278 motif","pmids":["26788537"],"confidence":"High","gaps":["Functional consequence of CK1 phosphorylation of FAM83H unknown","Mouse null lacked enamel phenotype, leaving normal physiological role unclear"]},{"year":2016,"claim":"Demonstrating CK1 recruitment to nuclear speckles via SON, and desmosome disruption by truncated FAM83H, connected localization control to cell-junction biology.","evidence":"MS interactome, siRNA epistasis, and immunofluorescence in cells lacking simple epithelial keratins; ameloblast IF with CK1 inhibitor","pmids":["27681590","27222304"],"confidence":"High","gaps":["Functional role of CK1 at nuclear speckles not defined","Mechanism by which truncated protein blocks desmosome assembly partial"]},{"year":2017,"claim":"Identifying MYC as a transcriptional activator of FAM83H placed it downstream of an oncogenic transcription factor.","evidence":"ChIP and dual-luciferase reporter assays in hepatic tumor cells","pmids":["28607447"],"confidence":"Medium","gaps":["Single lab, two methods","Did not establish a functional consequence in tumors"]},{"year":2019,"claim":"Showing FAM83H binds and stabilizes β-catenin against proteasomal degradation defined a second scaffold function linking it to Wnt signaling output.","evidence":"Co-IP, knockdown/overexpression with mRNA/protein discordance, and ubiquitination assays in osteosarcoma cells","pmids":["31215499"],"confidence":"Medium","gaps":["Did not identify the relevant E3 ligase","Relationship to CK1 scaffold role unresolved"]},{"year":2019,"claim":"A truncation knock-in mouse phenocopying human enamel defects, contrasted with the normal null, cemented the neomorphic gain-of-function model.","evidence":"CRISPR/Cas9 p.Tyr297* knock-in mouse with micro-CT, SEM, histology, and microhardness","pmids":["31060110"],"confidence":"High","gaps":["Molecular cascade from truncated protein to enamel defect not fully traced in vivo"]},{"year":2020,"claim":"Mapping NCK1/2 binding, SEC16A interaction, and a FAM83H-SCRIB-β-catenin complex expanded the interactome and tied scaffold function to adaptor signaling and secretion.","evidence":"Co-IP with domain mapping and TurboID proximity labeling (NCK); pull-down (SEC16A); Co-IP with knockdown (SCRIB/β-catenin)","pmids":["32289446","33034243","32564009"],"confidence":"High","gaps":["Functional consequences of NCK1/2 and SEC16A binding not established","SEC16A interaction is a single pull-down"]},{"year":2018,"claim":"Linking FAM83H mutation to Wnt/β-catenin activation in ameloblasts provided a signaling explanation for the mineralization defect.","evidence":"Co-IP, IF, ALP assay and pyrvinium pamoate rescue in LS8 cells","pmids":["29709481"],"confidence":"Medium","gaps":["Single lab, overexpression of mutant","Apparent contradiction with later osteoblast model of Wnt inhibition unresolved"]},{"year":2022,"claim":"Defining the C-terminal residues 1134–1139 as the keratin-targeting signal and dissecting complex disruption clarified how truncation reroutes FAM83H/CK1 and impairs amelogenin secretion.","evidence":"Systematic deletion mapping with IF; CRISPR knock-in p.Q396* mouse with Co-IP complex analysis, EDS, and mRNA-seq","pmids":["35821396","36272714"],"confidence":"High","gaps":["How CK1 retention at the nucleus mechanistically disrupts secretion incompletely defined"]},{"year":2022,"claim":"Knockdown defining FAM83H as a regulator of enamel matrix protein expression connected the scaffold to the secretory output of ameloblasts.","evidence":"siRNA knockdown with qRT-PCR and western blot in HAT-7 ameloblast cells","pmids":["36318336"],"confidence":"Medium","gaps":["Direct vs indirect regulation of matrix genes not distinguished","Single cell line"]},{"year":2023,"claim":"An osteoblast study showed the same truncation increases cytoplasmic CK1α, promotes β-catenin degradation, and inhibits Wnt signaling, extending the neomorphic mechanism to bone.","evidence":"Fam83hQ396* knock-in mouse, primary osteoblasts, western blot, with CK1α siRNA and Wnt agonist rescue","pmids":["37028581"],"confidence":"High","gaps":["Direction of Wnt effect differs from ameloblast model, mechanism of context dependence unclear"]},{"year":2025,"claim":"Identifying TRIM29 and FNDC3B as stabilizers of FAM83H established upstream control of its protein abundance and tied it to cancer metastasis programs.","evidence":"Co-IP, LC-MS/MS, ubiquitination and rescue assays with in vivo metastasis models in colorectal and gastric cancer","pmids":["40389046","40450207"],"confidence":"Medium","gaps":["Whether these are direct E3-substrate relationships not fully resolved","Single lab per axis"]},{"year":2025,"claim":"Revealing a requirement for FAM83H in cortical thymic epithelial cell maturation uncovered an immunological function beyond epithelia and mineralized tissue.","evidence":"Fam83h knockout and CK1-binding-domain deletion mice with single-cell RNA-seq and thymic histology","pmids":["41546142"],"confidence":"Medium","gaps":["Mechanistic link between FAM83H-CK1 and Foxn1 transcription not established","Single lab"]},{"year":null,"claim":"It remains unresolved how FAM83H-tethered CK1 selects its physiological substrates and how the same protein produces opposing Wnt/β-catenin outcomes across cell types.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct CK1 substrate identified at keratin filaments or nuclear speckles","Context dependence of β-catenin stabilization vs degradation unexplained","No structural model of the FAM83H-CK1-keratin complex"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,6,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,9,14,12]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[4,17]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[12,15]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[4,8,18]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[9,18,22]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,14]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[2]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[11,12,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,13,19,25]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,1]}],"complexes":["FAM83H-CK1α-keratin complex","FAM83H-CK1-SON nuclear speckle complex","FAM83H-SCRIB-β-catenin complex","FAM83H-CK1α-keratin14-amelogenin complex"],"partners":["CSNK1A1","SON","NCK1","NCK2","CTNNB1","SCRIB","TRIM29","FNDC3B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"FAM83H","url":"https://depmap.org/portal/gene/FAM83H","classification":"Not 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treatment","url":"https://pubmed.ncbi.nlm.nih.gov/39891867","citation_count":1,"is_preprint":false},{"pmid":"37761326","id":"PMC_37761326","title":"FAM83H Expression Is Associated with Tumor-Infiltrating PD1-Positive Lymphocytes and Predicts the Survival of Breast Carcinoma Patients.","date":"2023","source":"Diagnostics (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/37761326","citation_count":0,"is_preprint":false},{"pmid":"41546142","id":"PMC_41546142","title":"FAM83H Regulates Postnatal T Cell Development Through Thymic Stroma Organization.","date":"2026","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/41546142","citation_count":0,"is_preprint":false},{"pmid":"39859478","id":"PMC_39859478","title":"Expression of AMELX, AMBN, ENAM, TUFT1, FAM83H and MMP20 Genes in Buccal Epithelial Cells from Patients with Molar Incisor Hypomineralization (MIH)-A Pilot Study.","date":"2025","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39859478","citation_count":0,"is_preprint":false},{"pmid":"37659852","id":"PMC_37659852","title":"[Analysis of amelogenesis imperfecta with abnormal tooth eruption caused by FAM83H mutation].","date":"2023","source":"Zhonghua kou qiang yi xue za zhi = Zhonghua kouqiang yixue zazhi = Chinese journal of stomatology","url":"https://pubmed.ncbi.nlm.nih.gov/37659852","citation_count":0,"is_preprint":false},{"pmid":"41629968","id":"PMC_41629968","title":"Serum long noncoding RNA FAM83H-AS1 serves as a potential noninvasive diagnostic biomarker for ovarian cancer.","date":"2026","source":"Journal of ovarian research","url":"https://pubmed.ncbi.nlm.nih.gov/41629968","citation_count":0,"is_preprint":false},{"pmid":"42081114","id":"PMC_42081114","title":"Pre-eruptive Coronal Resorptions as a Clinical Feature of FAM83H-Related Amelogenesis Imperfecta: Insights from Two Brazilian Families.","date":"2026","source":"Calcified tissue international","url":"https://pubmed.ncbi.nlm.nih.gov/42081114","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.10.01.616079","title":"CK1α, FAM83H, and FAM83B contribute to bundling of neurofilaments and are sequestered in cellular and mice models of ARSACS","date":"2024-10-01","source":"bioRxiv","url":"https://doi.org/10.1101/2024.10.01.616079","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48035,"output_tokens":6303,"usd":0.119325,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15221,"output_tokens":5070,"usd":0.101428,"stage2_stop_reason":"end_turn"},"total_usd":0.220753,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2008,\n      \"finding\": \"Nonsense mutations in FAM83H (R325X and Q398X) cause autosomal dominant hypocalcified amelogenesis imperfecta, establishing FAM83H as required for proper dental enamel calcification.\",\n      \"method\": \"Genetic linkage and mutation analysis with cosegregation in affected families\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple independent families and labs, cosegregation confirmed\",\n      \"pmids\": [\"18252228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"All ADHCAI-causing FAM83H mutations are nonsense mutations in the last exon that delete between 503 and 883 amino acids from the C-terminus, establishing that the large C-terminal portion of FAM83H is required for enamel calcification.\",\n      \"method\": \"Mutation screening and sequencing of four kindreds with ADHCAI\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple independent families, replicated finding across labs\",\n      \"pmids\": [\"18484629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FAM83H (Fam83h) protein localizes to perinuclear vesicles in the vicinity of the Golgi apparatus in HEK293 and HeLa cells, and is not secreted (lacks signal peptide), establishing it as an intracellular protein.\",\n      \"method\": \"GFP fusion protein expression and live-cell fluorescence imaging in HEK293 and HeLa cells\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization by GFP imaging, single lab, two cell lines\",\n      \"pmids\": [\"19828885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Truncation mutations (R325X, W460X, Q677X) cause FAM83H to relocalize predominantly to the nucleus, whereas wild-type and p.E694X mutant FAM83H localizes to the cytoplasm in HEK293T cells, linking nuclear mistargeting of truncated FAM83H to severe generalized enamel phenotype.\",\n      \"method\": \"GFP fusion protein transfection and fluorescence microscopy in HEK293T cells\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment, multiple mutants tested, single lab\",\n      \"pmids\": [\"21118793\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FAM83H regulates the filamentous state of keratins in epithelial cells: FAM83H knockdown induces keratin filament bundling, while overexpression disassembles keratin filaments. The N-terminal region of FAM83H interacts with CK-1α and the C-terminal region interacts with keratins, suggesting FAM83H tethers CK-1α to keratins.\",\n      \"method\": \"siRNA knockdown, overexpression, co-immunoprecipitation, immunofluorescence in colorectal cancer cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus functional KD/OE with defined phenotype, independently replicated in subsequent papers\",\n      \"pmids\": [\"23902688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CK-1α inhibition phenocopies FAM83H knockdown (causes keratin filament bundling) and reverses keratin filament disassembly induced by FAM83H overexpression, establishing that CK-1α kinase activity mediates FAM83H-dependent keratin cytoskeleton reorganization.\",\n      \"method\": \"CK-1α pharmacological inhibition, epistasis analysis in colorectal cancer cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic/pharmacological epistasis with defined cellular phenotype, replicated in multiple subsequent studies\",\n      \"pmids\": [\"23902688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Fam83h knockout mice show no dental enamel defects, but Fam83h truncation causes altered subcellular localization of CK1. FAM83H dimerizes through its N-terminal PLD-like (DUF1669) domain, and CK1 interacts with FAM83H via an F270-X-X-X-F274-X-X-X-F278 motif within the PLD-like domain. CK1 can phosphorylate FAM83H in vitro, with phosphorylation sites in the C-terminus.\",\n      \"method\": \"Fam83h knockout/lacZ knockin mouse model; in vitro pull-down assays; in vitro kinase assay; LacZ reporter expression\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay, pull-down, and mouse model with multiple orthogonal methods in one study\",\n      \"pmids\": [\"26788537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Fam83h null mice have no enamel phenotype, supporting a neomorphic (gain-of-function) rather than haploinsufficiency mechanism for ADHCAI caused by FAM83H truncation mutations.\",\n      \"method\": \"Fam83h knockout mouse characterization (enamel microhardness, histology, micro-CT)\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null mouse model with rigorous enamel phenotyping, finding replicated in subsequent truncation knock-in models\",\n      \"pmids\": [\"26788537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"FAM83H localizes on keratin filaments preferentially around the nucleus extending to cell-cell junctions in ameloblastoma cells and mouse ameloblasts in vivo. AI-causing truncated FAM83H prevents desmosomal proteins from localizing to cell-cell junctions, and this effect depends on the truncated protein's binding to and inhibition of CK-1.\",\n      \"method\": \"Immunofluorescence in human ameloblastoma cell lines and mouse tissue; overexpression/knockdown/AI-mutant transfection; CK-1 inhibitor D4476\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (IF, KD, OE, mutant, pharmacological inhibition), in vivo and in vitro\",\n      \"pmids\": [\"27222304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CK1α (and CK1δ/ε) is recruited to nuclear speckles by FAM83H together with the scaffold protein SON; FAM83H and CK1α localize to nuclear speckles in cells lacking simple epithelial keratins, and knockdown of FAM83H or SON delocalizes CK1 from nuclear speckles.\",\n      \"method\": \"siRNA knockdown, interactome analysis (MS), immunofluorescence in colorectal cancer cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS interactome plus siRNA epistasis plus IF, multiple orthogonal methods\",\n      \"pmids\": [\"27681590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MYC binds to the promoter of FAM83H and promotes its transcription, as demonstrated by chromatin immunoprecipitation assay and dual-luciferase reporter assay in hepatic tumor cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), dual-luciferase reporter assay, Tet-O-MYC mouse model hepatic cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP + luciferase reporter, single lab, two orthogonal methods\",\n      \"pmids\": [\"28607447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Fam83h mutation (c.1186C>T) alters the localization of Fam83h, CK1α, and β-catenin in LS8 ameloblast cells, inhibits mineralization, and downregulates expression of mineralization factors. Pyrvinium pamoate (Wnt/β-catenin inhibitor) rescues the inhibited mineralization, establishing that Fam83h mutation activates Wnt/β-catenin signaling to inhibit ameloblast mineralization.\",\n      \"method\": \"Immunoprecipitation, western blot, immunofluorescence, ALP activity assay, Wnt pathway inhibitor rescue in LS8 cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, IF, pharmacological rescue, single lab\",\n      \"pmids\": [\"29709481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"FAM83H directly interacts with β-catenin by immunoprecipitation, and FAM83H knockdown decreases β-catenin protein but not mRNA, increases β-catenin ubiquitination and proteasomal degradation, while overexpression stabilizes β-catenin. This establishes FAM83H as a scaffold that stabilizes β-catenin by preventing its proteasomal degradation in osteosarcoma cells.\",\n      \"method\": \"Co-immunoprecipitation, knockdown/overexpression, western blot, ubiquitination assay in osteosarcoma cells\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay plus mRNA/protein discordance, single lab\",\n      \"pmids\": [\"31215499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Fam83h truncation (p.Tyr297*) knock-in mice exhibit enamel defects (hypoplastic enamel, rough surfaces, altered enamel rod orientation), whereas null mice do not, confirming a neomorphic gain-of-function mechanism for ADHCAI truncation mutations.\",\n      \"method\": \"CRISPR/Cas9 knock-in mouse model; micro-CT, SEM, histology, microhardness measurement\",\n      \"journal\": \"Molecular genetics & genomic medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two mouse models directly compared (null vs. truncation knock-in), multiple phenotyping methods\",\n      \"pmids\": [\"31060110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FAM83H interacts with NCK1/2 tyrosine kinase adaptor proteins, mediated by proline-rich motifs in the C-terminus of FAM83H specifically binding the second and third SH3 domains of NCK1/2. AI mutant truncated FAM83H proteins lose this interaction while retaining interaction with CK1 isoforms. AI mutant FAM83H acquires nuclear localization and recruits CK1 to the nucleus where CK1 retains kinase activity.\",\n      \"method\": \"Co-immunoprecipitation, domain deletion mapping, co-localization, TurboID proximity labeling in cell lines\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with domain mapping, proximity labeling, multiple orthogonal methods in one study\",\n      \"pmids\": [\"32289446\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FAM83H, SCRIB, and β-catenin form a protein complex (demonstrated by immunoprecipitation), and knockdown of either FAM83H or SCRIB accelerates proteasomal degradation of β-catenin in gastric cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, knockdown experiments, western blot in gastric cancer cells\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing trimeric complex plus functional KD, single lab\",\n      \"pmids\": [\"32564009\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FAM83H interacts with SEC16A, a component of the COPII complex at ER exit sites, with the interaction mediated by the middle part (amino acids 287–657) of mouse FAM83H, suggesting a role for FAM83H in ER-to-Golgi vesicle trafficking and protein secretion.\",\n      \"method\": \"In vitro pull-down studies with overexpressed FAM83H proteins in HEK293 cells\",\n      \"journal\": \"Journal of dental research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single pull-down interaction, domain mapping, single lab\",\n      \"pmids\": [\"33034243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"FAM83H knockdown in cutaneous SCC cells enhances migration and invasion, while overexpression decreases both. FAM83H forms a complex with TRIM29 and keratins (by immunoprecipitation), and FAM83H knockdown alters keratin distribution and solubility.\",\n      \"method\": \"siRNA knockdown, overexpression, immunoprecipitation, immunofluorescence, migration/invasion assays, in vivo metastasis model\",\n      \"journal\": \"Journal of dermatological science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional assays with defined phenotype, single lab\",\n      \"pmids\": [\"34657752\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The conserved C-terminal residues 1134–1139 of FAM83H are required for its localization to and recruitment of CK1 to the keratin cytoskeleton. Deletion of these residues causes FAM83H and CK1 to translocate to nuclear speckles instead. Amino acid residues 1–603 contain the region responsible for CK1 recruitment to nuclear speckles.\",\n      \"method\": \"Deletion mutant transfection, immunofluorescence in cell lines\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic deletion mapping with IF, single lab, defined residues\",\n      \"pmids\": [\"35821396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Truncated FAM83H (p.Q396*) disrupts the FAM83H-CK1α-keratin 14-amelogenin complex in ameloblasts, leading to retention of amelogenin (AMELX) in the cytoplasm, decreased iron transport (reduced TFRC and SLC40A1), and decreased desmoglein 3 expression.\",\n      \"method\": \"CRISPR/Cas9 knock-in mouse (Fam83hQ396*/Q396*), immunofluorescence, EDS, Co-IP/complex analysis, mRNA sequencing\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse model combined with Co-IP complex analysis, mRNA sequencing, and multiple phenotypic readouts\",\n      \"pmids\": [\"36272714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"FAM83H knockdown in HAT-7 ameloblast cells decreases expression of amelogenin, enamelin, and kallikrein-related peptidase-4, while ameloblastin expression increases, establishing FAM83H as a regulator of enamel matrix protein secretion.\",\n      \"method\": \"siRNA knockdown in HAT-7 cells, qRT-PCR and western blot\",\n      \"journal\": \"Clinical oral investigations\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined molecular phenotype with KD in relevant cell type, single lab\",\n      \"pmids\": [\"36318336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Fam83h mutation (p.Q396*) in osteoblasts increases cytoplasmic CK1α levels (as part of the β-catenin degradation complex), promotes β-catenin degradation, reduces β-catenin nuclear translocation, inhibits Wnt/β-catenin signaling, and impairs osteoblast differentiation, causing mandible underdevelopment. Ck1α siRNA or Wnt agonists partially rescue this mineralization defect.\",\n      \"method\": \"Fam83hQ396*/Q396* knock-in mouse model; primary osteoblast culture; western blot; CK1α siRNA and Wnt agonist rescue experiments\",\n      \"journal\": \"Bone\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mouse model with primary cells, pharmacological and genetic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"37028581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The DUF1669 domain (residues 17–281) of FAM83H is required but not sufficient for nuclear speckle localization. Deletions within residues 1–300 attenuate or abolish nuclear speckle localization. Some ADHCAI-truncated FAM83H proteins containing the DUF1669 domain do not localize to nuclear speckles, indicating additional sequence requirements.\",\n      \"method\": \"Systematic deletion and truncation mutant transfection, immunofluorescence in cell lines\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic domain mapping with IF, single lab, multiple mutants\",\n      \"pmids\": [\"40210674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FNDC3B interacts with FAM83H (by Co-IP) and inhibits its ubiquitin-proteasome degradation, thereby stabilizing FAM83H protein. FNDC3B promotes gastric cancer metastasis via the FNDC3B/FAM83H/Snail/EMT axis.\",\n      \"method\": \"Co-immunoprecipitation, LC-MS/MS, rescue experiments, in vitro and in vivo functional assays\",\n      \"journal\": \"Cellular & molecular biology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus MS plus rescue experiments, single lab\",\n      \"pmids\": [\"40450207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM29 interacts with FAM83H and stabilizes it by reducing its ubiquitination and degradation, thereby redistributing cellular keratins and activating the NF-κB pathway and PLXNB2 upregulation to promote colorectal cancer liver metastasis.\",\n      \"method\": \"Co-immunoprecipitation, multi-omics sequencing, in vitro functional assays, in vivo metastasis models\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional rescue, multi-omics, single lab\",\n      \"pmids\": [\"40389046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Fam83h-deficient mice, FAM83H expression is confined to thymic epithelial cells (TECs); its deficiency disrupts thymic architecture and causes a severe block in DN3 T cell expansion. Single-cell transcriptomics reveals reduced Foxn1 and its downstream targets in cortical TECs, suggesting FAM83H, in coordination with CK1, is required for cTEC maturation.\",\n      \"method\": \"Fam83h knockout mouse model (Fam83h-/-) and CK1-binding domain deletion (Fam83hΔ87/Δ87); single-cell RNA-seq; histological analysis of thymus\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent mouse models, single-cell transcriptomics, single lab\",\n      \"pmids\": [\"41546142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In an ARSACS cellular model, CK1α, FAM83H, and FAM83B are upregulated and co-localize at sites of intermediate filament (neurofilament) bundling. CK1α inhibition or knockdown of FAM83H/FAM83B causes neurofilament bundling, while CK1α activation (SSTC3) only partially remediates bundling, suggesting FAM83H-CK1α axis regulates neurofilament dynamics.\",\n      \"method\": \"CRISPR knockdown, pharmacological CK1α inhibition/activation, immunofluorescence, co-localization in ARSACS patient fibroblasts and Sacs-/- cerebellum\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — preprint, single lab, localization and KD without full mechanistic reconstitution\",\n      \"pmids\": [\"bio_10.1101_2024.10.01.616079\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Fluoride exposure downregulates Fam83h expression in LS8 ameloblast-like cells via suppression of JNK and P38 (MAPK) phosphorylation, identifying the P38/JNK signaling pathway as a regulator of Fam83h expression in ameloblasts.\",\n      \"method\": \"Western blot and qRT-PCR with fluoride and MAPK inhibitor treatment in LS8 cells; ALP activity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological dissection with multiple inhibitors, defined molecular readout, single lab\",\n      \"pmids\": [\"26876574\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"FAM83H is a scaffold protein that recruits casein kinase 1 (CK1) isoforms to the keratin cytoskeleton (via conserved C-terminal residues 1134–1139 and the N-terminal DUF1669/PLD-like domain) or to nuclear speckles (via SON), thereby regulating keratin filament organization and desmosome formation; it also binds NCK1/2 adaptor proteins through C-terminal proline-rich motifs; disease-causing truncation mutations cause a neomorphic gain-of-function by mislocalizing CK1 to the nucleus and disrupting the FAM83H-CK1α-keratin-amelogenin complex, impairing enamel matrix secretion and activating Wnt/β-catenin signaling, while in non-epithelial contexts FAM83H stabilizes β-catenin from proteasomal degradation and is itself stabilized by TRIM29 and FNDC3B through inhibition of ubiquitination.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"FAM83H is an intracellular scaffold protein that controls the subcellular targeting of casein kinase 1 (CK1) isoforms, thereby coupling kinase activity to the keratin intermediate filament cytoskeleton and to enamel and bone development [#4, #6]. It binds CK1\\u03b1 through an F270-X-X-X-F274-X-X-X-F278 motif in its N-terminal PLD-like (DUF1669) domain and engages keratins through its C-terminus, tethering CK1\\u03b1 to keratin filaments and regulating their filamentous state\\u2014knockdown causes filament bundling while overexpression drives disassembly in a manner dependent on CK1\\u03b1 kinase activity [#4, #5, #6]. The conserved C-terminal residues 1134\\u20131139 dictate localization to the keratin cytoskeleton; their loss redirects FAM83H and CK1 to nuclear speckles, where recruitment depends on the scaffold protein SON and the N-terminal region (residues 1\\u2013603/DUF1669) [#9, #18, #22]. FAM83H additionally binds NCK1/2 adaptors via C-terminal proline-rich motifs that engage their SH3 domains [#14]. FAM83H also forms complexes with \\u03b2-catenin and SCRIB and stabilizes \\u03b2-catenin against ubiquitin-mediated proteasomal degradation [#12, #15]. Truncating mutations cause autosomal dominant hypocalcified amelogenesis imperfecta through a neomorphic gain of function rather than haploinsufficiency: null mice have normal enamel whereas truncation knock-in mice phenocopy the human disease, because truncated FAM83H mislocalizes to the nucleus, retains CK1 binding, and disrupts the FAM83H-CK1\\u03b1-keratin-amelogenin complex required for enamel matrix protein secretion [#0, #7, #13, #19]. In mineralizing cells this mislocalization dysregulates Wnt/\\u03b2-catenin signaling and impairs ameloblast and osteoblast differentiation [#11, #21]. Beyond epithelia, FAM83H is required for cortical thymic epithelial cell maturation and DN3 thymocyte expansion in coordination with CK1 [#25].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Linking FAM83H to a Mendelian enamel disorder established its physiological requirement, answering whether the gene had an essential developmental function.\",\n      \"evidence\": \"Genetic linkage and mutation cosegregation in ADHCAI families, identifying C-terminal nonsense mutations in the last exon\",\n      \"pmids\": [\"18252228\", \"18484629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not reveal the molecular function of the protein\", \"Did not distinguish loss- vs gain-of-function mechanism\", \"C-terminal region requirement was inferred from mutation position only\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing FAM83H as a non-secreted intracellular protein near the Golgi reframed it away from an extracellular enamel matrix component.\",\n      \"evidence\": \"GFP fusion live-cell imaging in HEK293 and HeLa cells\",\n      \"pmids\": [\"19828885\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Perinuclear localization not linked to a molecular activity\", \"Single lab, overexpression-based\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showing that disease truncations mislocalize FAM83H to the nucleus introduced subcellular mistargeting as a candidate disease mechanism.\",\n      \"evidence\": \"GFP fusion microscopy of multiple truncation mutants in HEK293T cells\",\n      \"pmids\": [\"21118793\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear mistargeting not yet connected to a partner or kinase\", \"Overexpression artifact not excluded\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying FAM83H as a CK1\\u03b1-keratin tether defined its core molecular activity as a kinase-cytoskeleton scaffold.\",\n      \"evidence\": \"Reciprocal Co-IP, siRNA knockdown/overexpression with keratin phenotype, and CK1\\u03b1 pharmacological epistasis in colorectal cancer cells\",\n      \"pmids\": [\"23902688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CK1\\u03b1 phosphorylation substrates on keratins not identified\", \"Did not map precise interaction motifs\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Null versus truncation mouse models resolved the disease mechanism as neomorphic gain-of-function and defined the CK1-binding motif and dimerization domain.\",\n      \"evidence\": \"Fam83h knockout/lacZ knockin mouse, in vitro pull-down, and in vitro kinase assay mapping the F270/F274/F278 motif\",\n      \"pmids\": [\"26788537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of CK1 phosphorylation of FAM83H unknown\", \"Mouse null lacked enamel phenotype, leaving normal physiological role unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating CK1 recruitment to nuclear speckles via SON, and desmosome disruption by truncated FAM83H, connected localization control to cell-junction biology.\",\n      \"evidence\": \"MS interactome, siRNA epistasis, and immunofluorescence in cells lacking simple epithelial keratins; ameloblast IF with CK1 inhibitor\",\n      \"pmids\": [\"27681590\", \"27222304\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of CK1 at nuclear speckles not defined\", \"Mechanism by which truncated protein blocks desmosome assembly partial\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying MYC as a transcriptional activator of FAM83H placed it downstream of an oncogenic transcription factor.\",\n      \"evidence\": \"ChIP and dual-luciferase reporter assays in hepatic tumor cells\",\n      \"pmids\": [\"28607447\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, two methods\", \"Did not establish a functional consequence in tumors\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing FAM83H binds and stabilizes \\u03b2-catenin against proteasomal degradation defined a second scaffold function linking it to Wnt signaling output.\",\n      \"evidence\": \"Co-IP, knockdown/overexpression with mRNA/protein discordance, and ubiquitination assays in osteosarcoma cells\",\n      \"pmids\": [\"31215499\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the relevant E3 ligase\", \"Relationship to CK1 scaffold role unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A truncation knock-in mouse phenocopying human enamel defects, contrasted with the normal null, cemented the neomorphic gain-of-function model.\",\n      \"evidence\": \"CRISPR/Cas9 p.Tyr297* knock-in mouse with micro-CT, SEM, histology, and microhardness\",\n      \"pmids\": [\"31060110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular cascade from truncated protein to enamel defect not fully traced in vivo\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Mapping NCK1/2 binding, SEC16A interaction, and a FAM83H-SCRIB-\\u03b2-catenin complex expanded the interactome and tied scaffold function to adaptor signaling and secretion.\",\n      \"evidence\": \"Co-IP with domain mapping and TurboID proximity labeling (NCK); pull-down (SEC16A); Co-IP with knockdown (SCRIB/\\u03b2-catenin)\",\n      \"pmids\": [\"32289446\", \"33034243\", \"32564009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of NCK1/2 and SEC16A binding not established\", \"SEC16A interaction is a single pull-down\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linking FAM83H mutation to Wnt/\\u03b2-catenin activation in ameloblasts provided a signaling explanation for the mineralization defect.\",\n      \"evidence\": \"Co-IP, IF, ALP assay and pyrvinium pamoate rescue in LS8 cells\",\n      \"pmids\": [\"29709481\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, overexpression of mutant\", \"Apparent contradiction with later osteoblast model of Wnt inhibition unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defining the C-terminal residues 1134\\u20131139 as the keratin-targeting signal and dissecting complex disruption clarified how truncation reroutes FAM83H/CK1 and impairs amelogenin secretion.\",\n      \"evidence\": \"Systematic deletion mapping with IF; CRISPR knock-in p.Q396* mouse with Co-IP complex analysis, EDS, and mRNA-seq\",\n      \"pmids\": [\"35821396\", \"36272714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CK1 retention at the nucleus mechanistically disrupts secretion incompletely defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Knockdown defining FAM83H as a regulator of enamel matrix protein expression connected the scaffold to the secretory output of ameloblasts.\",\n      \"evidence\": \"siRNA knockdown with qRT-PCR and western blot in HAT-7 ameloblast cells\",\n      \"pmids\": [\"36318336\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect regulation of matrix genes not distinguished\", \"Single cell line\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"An osteoblast study showed the same truncation increases cytoplasmic CK1\\u03b1, promotes \\u03b2-catenin degradation, and inhibits Wnt signaling, extending the neomorphic mechanism to bone.\",\n      \"evidence\": \"Fam83hQ396* knock-in mouse, primary osteoblasts, western blot, with CK1\\u03b1 siRNA and Wnt agonist rescue\",\n      \"pmids\": [\"37028581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direction of Wnt effect differs from ameloblast model, mechanism of context dependence unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying TRIM29 and FNDC3B as stabilizers of FAM83H established upstream control of its protein abundance and tied it to cancer metastasis programs.\",\n      \"evidence\": \"Co-IP, LC-MS/MS, ubiquitination and rescue assays with in vivo metastasis models in colorectal and gastric cancer\",\n      \"pmids\": [\"40389046\", \"40450207\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these are direct E3-substrate relationships not fully resolved\", \"Single lab per axis\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealing a requirement for FAM83H in cortical thymic epithelial cell maturation uncovered an immunological function beyond epithelia and mineralized tissue.\",\n      \"evidence\": \"Fam83h knockout and CK1-binding-domain deletion mice with single-cell RNA-seq and thymic histology\",\n      \"pmids\": [\"41546142\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between FAM83H-CK1 and Foxn1 transcription not established\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how FAM83H-tethered CK1 selects its physiological substrates and how the same protein produces opposing Wnt/\\u03b2-catenin outcomes across cell types.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No direct CK1 substrate identified at keratin filaments or nuclear speckles\", \"Context dependence of \\u03b2-catenin stabilization vs degradation unexplained\", \"No structural model of the FAM83H-CK1-keratin complex\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 6, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 9, 14, 12]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [4, 17]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [12, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 8, 18]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [9, 18, 22]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 14]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [11, 12, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 13, 19, 25]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\n      \"FAM83H-CK1\\u03b1-keratin complex\",\n      \"FAM83H-CK1-SON nuclear speckle complex\",\n      \"FAM83H-SCRIB-\\u03b2-catenin complex\",\n      \"FAM83H-CK1\\u03b1-keratin14-amelogenin complex\"\n    ],\n    \"partners\": [\n      \"CSNK1A1\",\n      \"SON\",\n      \"NCK1\",\n      \"NCK2\",\n      \"CTNNB1\",\n      \"SCRIB\",\n      \"TRIM29\",\n      \"FNDC3B\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":8,"faith_total":8,"faith_pct":100.0}}