{"gene":"POC1A","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":2024,"finding":"POC1A forms heterodimers with POC1B within the centriole lumen; the WD40 domain of POC1A resides in the centriole lumen and interacts with POC5, while the WD40 domain of POC1B localizes close to the centriole wall. This POC1A–POC1B heterodimer organizes an inner scaffold interaction network also involving FAM161A and MDM1, which bind POC1A–POC1B and likely position the POC5 tetramer near the centriole wall. POC1A–POC5 interaction and POC5 tetramerization are essential for inner scaffold formation and centriole stability.","method":"Interaction network mapping (Co-IP/pulldown), domain localization studies, genetic disruption of POC1A and POC1B (single and double deletion), structural/functional analysis of WD40 domain interactions","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal protein interaction mapping with domain-level resolution, orthogonal localization and genetic disruption experiments in a single rigorous study","pmids":["39543170"],"is_preprint":false},{"year":2012,"finding":"POC1A and POC1B each independently localize to centrioles and spindle poles. A fraction of each protein is stably incorporated into parental centrioles. Depletion of both POC1A and POC1B (but not either alone) prevents incorporation into nascent centrioles, causing loss of centriole integrity and maturation, failure of centriole duplication, and generation of monopolar/unequal spindles. POC1B, but not POC1A, is phosphorylated during mitosis, and depletion of POC1B alone perturbs cell proliferation.","method":"Isoform-specific antibodies, RNAi depletion (single and double knockdown), live-cell imaging, immunofluorescence localization, FRAP-like incorporation assays","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal depletion with multiple orthogonal readouts (spindle organization, centriole integrity, proliferation), isoform-specific reagents, replicated functional assays in single rigorous study","pmids":["23015594"],"is_preprint":false},{"year":2012,"finding":"Truncating mutations in POC1A cause defective ciliogenesis; siRNA knockdown of POC1A in fibroblast cells recapitulates the ciliogenesis defect. Patient-derived cells also show abnormal mitotic mechanics with multipolar spindles, consistent with a role for POC1A in both ciliogenesis and mitotic spindle integrity.","method":"siRNA knockdown in fibroblasts, immunofluorescence for cilia and spindle organization, patient cell analysis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct loss-of-function (siRNA) with defined phenotypic readouts (ciliogenesis, spindle), single lab","pmids":["22840364"],"is_preprint":false},{"year":2012,"finding":"A p.Leu171Pro missense mutation in POC1A causes abnormal centrosome number and distribution in patient cells, dispersed Golgi morphology, aberrant cholera-toxin trafficking from the plasma membrane to the Golgi, and accumulation of large cytosolic vesicles, demonstrating that POC1A is required for proper centrosome function and Golgi assembly/trafficking.","method":"Patient-derived cell analysis, immunofluorescence of centrosomes and Golgi, cholera-toxin trafficking assay","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cellular functional assays in patient cells with multiple orthogonal readouts, single lab","pmids":["22840363"],"is_preprint":false},{"year":2015,"finding":"A p.T120A missense mutation in POC1A causes formation of supernumerary centrosomes and multipolar spindles with abnormal chromosome arrangement in patient fibroblasts. This mutation is accompanied by alterations in the centrosome-associated WD repeat protein p80-katanin, implicating POC1A in regulating centriole number and spindle assembly upstream of or alongside p80-katanin.","method":"Patient primary fibroblast culture, immunofluorescence for centrosomes and mitotic spindles, gene expression array, co-analysis of p80-katanin","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct cellular assays in patient fibroblasts with multiple readouts (centrosome number, spindle structure, gene expression), single lab","pmids":["26162852"],"is_preprint":false},{"year":2015,"finding":"Disruption of Poc1a in mice (by LINE-1-mediated insertion) causes impaired cilia formation and multipolar spindles in fibroblasts, defective spermatogenesis with progressive germ cell loss, and disorganized chondrocyte proliferative zone (chondrocytes fail to re-align after division and undergo increased apoptosis). Spermatogonial stem cell transplantation showed Poc1a is essential for both Sertoli cell and germ cell function.","method":"Mouse genetic model (spontaneous insertion mutant), cilia formation assay, spindle analysis, histology of growth plate, spermatogonial stem cell transplantation","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo loss-of-function mouse model with multiple orthogonal cellular and tissue-level phenotypic readouts, transplantation rescue experiment","pmids":["26496357"],"is_preprint":false},{"year":2015,"finding":"Patient cells with a frameshift mutation in POC1A exhibit increased centrosome amplification and multipolar spindle formation during mitosis, with normal DNA content (arguing against mitotic skipping or cell fusion). Centrosome clustering at mitotic spindles and in primary cilia partially mitigates centrosome amplification, and primary ciliary formation is normal in this specific mutation context.","method":"Patient-derived primary cell analysis, immunofluorescence for centrosomes, spindle, and primary cilia, DNA content analysis","journal":"Journal of molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct patient cell assays with multiple orthogonal readouts, single lab","pmids":["26336158"],"is_preprint":false},{"year":2024,"finding":"Loss of POC1A protein expression in patient fibroblasts and POC1A-deleted human adipose stem cells impairs ciliogenesis and adipocyte differentiation, induces cellular senescence, and leads to resistance to insulin and IGF-1. An altered subcellular localization of insulin receptors (and to a lesser extent IGF-1 receptors) was also observed, potentially contributing to hormone resistance.","method":"Patient fibroblasts, CRISPR-deleted human adipose stem cells, ciliogenesis assay, adipocyte differentiation assay, cellular senescence assay, insulin/IGF-1 signaling assays, receptor localization by immunofluorescence","journal":"European journal of endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cellular models (patient fibroblasts and gene-deleted stem cells) with several orthogonal functional readouts, single lab","pmids":["38245004"],"is_preprint":false},{"year":2025,"finding":"POC1A promotes epithelial-mesenchymal transition (EMT) in triple-negative breast cancer cells, regulating invasion and metastasis in vitro and in vivo. RNA sequencing followed by experimental validation revealed that POC1A acts through activation of the STAT3 signaling pathway to induce EMT.","method":"RNA-seq pathway analysis, Western blot, RT-qPCR, immunofluorescence, migration/invasion assays, xenograft mouse models, STAT3 pathway inhibition/validation","journal":"Molecular medicine (Cambridge, Mass.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RNA-seq, in vitro functional assays, in vivo xenograft) establishing pathway placement, single lab","pmids":["40830747"],"is_preprint":false}],"current_model":"POC1A is a WD40 repeat centriolar protein that forms heterodimers with POC1B to organize the centriole inner scaffold (together with POC5, FAM161A, and MDM1), and is required for centriole integrity, centriole duplication, mitotic spindle organization, ciliogenesis, and—in specific cellular contexts—adipocyte differentiation and insulin receptor localization; loss-of-function causes supernumerary/unstable centrioles, multipolar spindles, and defective cilia, while overexpression in cancer cells drives EMT via STAT3 signaling."},"narrative":{"mechanistic_narrative":"POC1A is a WD40-repeat centriolar protein that builds and stabilizes the centriole inner scaffold and is required for centriole integrity, duplication, mitotic spindle organization, and ciliogenesis [PMID:39543170, PMID:23015594]. It forms a heterodimer with POC1B in the centriole lumen, where the POC1A WD40 domain faces the lumen and interacts with POC5, while POC1B sits closer to the centriole wall; together with FAM161A and MDM1 this assembly organizes an inner scaffold interaction network, and the POC1A–POC5 interaction with POC5 tetramerization is essential for inner scaffold formation and centriole stability [PMID:39543170]. POC1A and POC1B localize to centrioles and spindle poles and are stably incorporated into parental centrioles, with the two paralogs acting redundantly for incorporation into nascent centrioles—co-depletion, but not loss of either alone, abolishes centriole maturation and duplication and produces monopolar or unequal spindles [PMID:23015594]. Loss-of-function in patient cells and mouse models causes centrosome amplification, multipolar spindles, and defective cilia, and in mice additionally disrupts spermatogenesis and chondrocyte organization in the growth plate [PMID:22840364, PMID:26496357, PMID:26336158]. Human truncating and missense mutations in POC1A cause a developmental ciliopathy/skeletal phenotype, with patient cells showing abnormal centrosome number, defective ciliogenesis, and disrupted Golgi assembly and trafficking [PMID:22840364, PMID:22840363, PMID:26162852]. In specific cellular contexts POC1A loss impairs adipocyte differentiation, induces senescence, and alters insulin-receptor localization producing insulin/IGF-1 resistance [PMID:38245004], while its overexpression drives epithelial–mesenchymal transition in breast cancer cells through STAT3 signaling [PMID:40830747].","teleology":[{"year":2012,"claim":"Established that POC1A is a centriolar/spindle-pole protein functionally redundant with its paralog POC1B for centriole duplication and integrity, resolving whether the two POC1 proteins act independently.","evidence":"Isoform-specific antibodies and single/double RNAi depletion with live-cell imaging and incorporation assays in human cells","pmids":["23015594"],"confidence":"High","gaps":["Did not resolve the molecular architecture by which POC1A is incorporated into the centriole lumen","Differential mitotic phosphorylation of POC1B vs POC1A left functionally unexplained","No structural model of the POC1A interaction network"]},{"year":2012,"claim":"Linked POC1A loss-of-function to a human disease phenotype by showing truncating mutations cause defective ciliogenesis and abnormal mitotic spindles, connecting centriole function to organismal pathology.","evidence":"Patient cell analysis plus siRNA knockdown in fibroblasts with cilia and spindle immunofluorescence","pmids":["22840364"],"confidence":"Medium","gaps":["Single lab; ciliogenesis defect mechanism not dissected at molecular level","Did not address why centriole defects produce specific tissue phenotypes"]},{"year":2012,"claim":"Extended POC1A function beyond centriole/spindle to Golgi assembly and membrane trafficking, showing a missense mutation disrupts centrosome number, Golgi morphology, and toxin trafficking.","evidence":"Patient-derived cells with centrosome/Golgi immunofluorescence and cholera-toxin trafficking assay","pmids":["22840363"],"confidence":"Medium","gaps":["Whether Golgi/trafficking defects are direct or secondary to centrosome dysfunction not established","Single missense allele; mechanism of trafficking link unknown"]},{"year":2015,"claim":"Demonstrated in vivo requirement for POC1A across multiple tissues, showing it is essential for cilia, spindle bipolarity, spermatogenesis, and chondrocyte organization.","evidence":"Mouse insertional mutant with cilia/spindle assays, growth-plate histology, and spermatogonial stem cell transplantation","pmids":["26496357"],"confidence":"High","gaps":["Tissue-specific molecular basis of germ cell and chondrocyte phenotypes not resolved","Did not map which centriole functions drive each tissue defect"]},{"year":2015,"claim":"Refined the disease mechanism by showing distinct POC1A mutations cause supernumerary centrosomes and multipolar spindles, in one case implicating the regulator p80-katanin.","evidence":"Patient fibroblast immunofluorescence, gene expression array, and DNA-content and centrosome/spindle analyses","pmids":["26162852","26336158"],"confidence":"Medium","gaps":["Functional relationship between POC1A and p80-katanin not directly tested","Variable ciliary phenotype across alleles unexplained","Centrosome clustering as compensatory mechanism not mechanistically dissected"]},{"year":2024,"claim":"Resolved the molecular architecture of the centriole inner scaffold, placing the POC1A–POC1B heterodimer at its core and defining the POC1A–POC5–FAM161A–MDM1 interaction network required for centriole stability.","evidence":"Co-IP/pulldown interaction mapping with domain-level localization and single/double genetic disruption","pmids":["39543170"],"confidence":"High","gaps":["High-resolution structure of the assembled inner scaffold not determined","Order and regulation of scaffold assembly during the cell cycle unresolved"]},{"year":2024,"claim":"Connected POC1A loss to metabolic dysfunction, showing impaired adipocyte differentiation, senescence, and mislocalized insulin receptors causing hormone resistance.","evidence":"Patient fibroblasts and CRISPR-deleted adipose stem cells with differentiation, senescence, signaling, and receptor-localization assays","pmids":["38245004"],"confidence":"Medium","gaps":["Mechanistic link between centriole/cilia defect and insulin-receptor mislocalization not established","Single lab; causality of senescence in hormone resistance unclear"]},{"year":2025,"claim":"Identified an oncogenic role for POC1A, showing overexpression drives EMT, invasion, and metastasis via STAT3 signaling in triple-negative breast cancer.","evidence":"RNA-seq, in vitro migration/invasion assays, xenograft models, and STAT3 pathway inhibition","pmids":["40830747"],"confidence":"Medium","gaps":["How a centriolar protein activates STAT3 mechanistically not defined","Relationship between centriole function and EMT-promoting activity unknown","Single lab; cancer-type generality untested"]},{"year":null,"claim":"It remains unknown how POC1A's core centriole-scaffolding role mechanistically connects to its context-specific functions in Golgi trafficking, insulin-receptor localization, and STAT3-driven EMT.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying mechanism linking centriole/cilia function to metabolic and oncogenic phenotypes","No structure of the assembled inner scaffold","Regulation of POC1A incorporation and turnover during the cell cycle uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2,5]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[5]}],"complexes":["centriole inner scaffold (POC1A–POC1B–POC5–FAM161A–MDM1)"],"partners":["POC1B","POC5","FAM161A","MDM1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8NBT0","full_name":"POC1 centriolar protein homolog A","aliases":["Pix2","Proteome of centriole protein 1A","WD repeat-containing protein 51A"],"length_aa":407,"mass_kda":45.0,"function":"Plays an important role in centriole assembly and/or stability and ciliogenesis. Involved in early steps of centriole duplication, as well as in the later steps of centriole length control. Acts in concert with POC1B to ensure centriole integrity and proper mitotic spindle formation","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole; Cytoplasm, cytoskeleton, cilium basal body; Cytoplasm, cytoskeleton, spindle pole","url":"https://www.uniprot.org/uniprotkb/Q8NBT0/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/POC1A","classification":"Not Classified","n_dependent_lines":271,"n_total_lines":1208,"dependency_fraction":0.22433774834437087},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/POC1A","total_profiled":1310},"omim":[{"mim_id":"614813","title":"SHORT STATURE, ONYCHODYSPLASIA, FACIAL DYSMORPHISM, AND HYPOTRICHOSIS; SOFT","url":"https://www.omim.org/entry/614813"},{"mim_id":"614784","title":"POC1 CENTRIOLAR PROTEIN B; POC1B","url":"https://www.omim.org/entry/614784"},{"mim_id":"614783","title":"POC1 CENTRIOLAR PROTEIN A; POC1A","url":"https://www.omim.org/entry/614783"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Flagellar centriole","reliability":"Supported"},{"location":"Mid piece","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":11.9},{"tissue":"testis","ntpm":16.5}],"url":"https://www.proteinatlas.org/search/POC1A"},"hgnc":{"alias_symbol":["DKFZP434C245"],"prev_symbol":["WDR51A"]},"alphafold":{"accession":"Q8NBT0","domains":[{"cath_id":"2.130.10.10","chopping":"9-298","consensus_level":"high","plddt":95.5386,"start":9,"end":298},{"cath_id":"1.20.5","chopping":"364-407","consensus_level":"medium","plddt":84.2214,"start":364,"end":407}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NBT0","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NBT0-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8NBT0-F1-predicted_aligned_error_v6.png","plddt_mean":84.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=POC1A","jax_strain_url":"https://www.jax.org/strain/search?query=POC1A"},"sequence":{"accession":"Q8NBT0","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8NBT0.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8NBT0/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8NBT0"}},"corpus_meta":[{"pmid":"22840364","id":"PMC_22840364","title":"POC1A truncation mutation causes a ciliopathy in humans characterized by primordial dwarfism.","date":"2012","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22840364","citation_count":74,"is_preprint":false},{"pmid":"23015594","id":"PMC_23015594","title":"Poc1A and Poc1B act together in human cells to ensure centriole integrity.","date":"2012","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/23015594","citation_count":67,"is_preprint":false},{"pmid":"22840363","id":"PMC_22840363","title":"Short stature, onychodysplasia, facial dysmorphism, and hypotrichosis syndrome is caused by a POC1A mutation.","date":"2012","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22840363","citation_count":55,"is_preprint":false},{"pmid":"26162852","id":"PMC_26162852","title":"Novel POC1A mutation in primordial dwarfism reveals new insights for centriole biogenesis.","date":"2015","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26162852","citation_count":26,"is_preprint":false},{"pmid":"26496357","id":"PMC_26496357","title":"LINE-1 Mediated Insertion into Poc1a (Protein of Centriole 1 A) Causes Growth Insufficiency and Male Infertility in Mice.","date":"2015","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26496357","citation_count":25,"is_preprint":false},{"pmid":"26336158","id":"PMC_26336158","title":"Truncation of POC1A associated with short stature and extreme insulin resistance.","date":"2015","source":"Journal of molecular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/26336158","citation_count":24,"is_preprint":false},{"pmid":"26791357","id":"PMC_26791357","title":"SOFT syndrome caused by compound heterozygous mutations of POC1A and its skeletal manifestation.","date":"2016","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26791357","citation_count":18,"is_preprint":false},{"pmid":"39543170","id":"PMC_39543170","title":"An interaction network of inner centriole proteins organised by POC1A-POC1B heterodimer crosslinks ensures centriolar integrity.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/39543170","citation_count":15,"is_preprint":false},{"pmid":"26374189","id":"PMC_26374189","title":"Two novel POC1A mutations in the primordial dwarfism, SOFT syndrome: Clinical homogeneity but also unreported malformations.","date":"2015","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/26374189","citation_count":14,"is_preprint":false},{"pmid":"28819016","id":"PMC_28819016","title":"A syndromic extreme insulin resistance caused by biallelic POC1A mutations in exon 10.","date":"2017","source":"European journal of endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/28819016","citation_count":12,"is_preprint":false},{"pmid":"31767933","id":"PMC_31767933","title":"A novel POC1A variant in an alternatively spliced exon causes classic SOFT syndrome: clinical presentation of seven patients.","date":"2019","source":"Journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31767933","citation_count":11,"is_preprint":false},{"pmid":"38245004","id":"PMC_38245004","title":"Ciliopathy due to POC1A deficiency: clinical and metabolic features, and cellular modeling.","date":"2024","source":"European journal of endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/38245004","citation_count":6,"is_preprint":false},{"pmid":"34419044","id":"PMC_34419044","title":"Identification of SOFT syndrome caused by a pathogenic homozygous splicing variant of POC1A: a case report.","date":"2021","source":"BMC medical genomics","url":"https://pubmed.ncbi.nlm.nih.gov/34419044","citation_count":6,"is_preprint":false},{"pmid":"33955509","id":"PMC_33955509","title":"Further phenotypic features and two novel POC1A variants in a patient with SOFT syndrome: A case report.","date":"2021","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/33955509","citation_count":5,"is_preprint":false},{"pmid":"37056285","id":"PMC_37056285","title":"Case Report: Identification of a rare nonsense mutation in the POC1A gene by NGS in a diabetes mellitus patient.","date":"2023","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/37056285","citation_count":4,"is_preprint":false},{"pmid":"35930384","id":"PMC_35930384","title":"Pigmentary retinopathy with perivascular sparing in a SOFT syndrome patient with a novel homozygous splicing variant in POC1A gene.","date":"2022","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35930384","citation_count":3,"is_preprint":false},{"pmid":"40830747","id":"PMC_40830747","title":"POC1A induces epithelial-mesenchymal transition to promote growth and metastasis through the STAT3 signaling pathway in triple-negative breast cancer.","date":"2025","source":"Molecular medicine (Cambridge, Mass.)","url":"https://pubmed.ncbi.nlm.nih.gov/40830747","citation_count":2,"is_preprint":false},{"pmid":"41237374","id":"PMC_41237374","title":"Immunohistochemical expression of POC1A, NUF2, and Ki-67 in invasive ductal carcinoma of the breast.","date":"2025","source":"American journal of clinical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/41237374","citation_count":2,"is_preprint":false},{"pmid":"39430849","id":"PMC_39430849","title":"Analysis of the role of POC1A in the development and progression of hepatocellular carcinoma.","date":"2024","source":"Translational cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/39430849","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":11320,"output_tokens":2478,"usd":0.035565,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9677,"output_tokens":3288,"usd":0.065293,"stage2_stop_reason":"end_turn"},"total_usd":0.100858,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2024,\n      \"finding\": \"POC1A forms heterodimers with POC1B within the centriole lumen; the WD40 domain of POC1A resides in the centriole lumen and interacts with POC5, while the WD40 domain of POC1B localizes close to the centriole wall. This POC1A–POC1B heterodimer organizes an inner scaffold interaction network also involving FAM161A and MDM1, which bind POC1A–POC1B and likely position the POC5 tetramer near the centriole wall. POC1A–POC5 interaction and POC5 tetramerization are essential for inner scaffold formation and centriole stability.\",\n      \"method\": \"Interaction network mapping (Co-IP/pulldown), domain localization studies, genetic disruption of POC1A and POC1B (single and double deletion), structural/functional analysis of WD40 domain interactions\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal protein interaction mapping with domain-level resolution, orthogonal localization and genetic disruption experiments in a single rigorous study\",\n      \"pmids\": [\"39543170\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"POC1A and POC1B each independently localize to centrioles and spindle poles. A fraction of each protein is stably incorporated into parental centrioles. Depletion of both POC1A and POC1B (but not either alone) prevents incorporation into nascent centrioles, causing loss of centriole integrity and maturation, failure of centriole duplication, and generation of monopolar/unequal spindles. POC1B, but not POC1A, is phosphorylated during mitosis, and depletion of POC1B alone perturbs cell proliferation.\",\n      \"method\": \"Isoform-specific antibodies, RNAi depletion (single and double knockdown), live-cell imaging, immunofluorescence localization, FRAP-like incorporation assays\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal depletion with multiple orthogonal readouts (spindle organization, centriole integrity, proliferation), isoform-specific reagents, replicated functional assays in single rigorous study\",\n      \"pmids\": [\"23015594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Truncating mutations in POC1A cause defective ciliogenesis; siRNA knockdown of POC1A in fibroblast cells recapitulates the ciliogenesis defect. Patient-derived cells also show abnormal mitotic mechanics with multipolar spindles, consistent with a role for POC1A in both ciliogenesis and mitotic spindle integrity.\",\n      \"method\": \"siRNA knockdown in fibroblasts, immunofluorescence for cilia and spindle organization, patient cell analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct loss-of-function (siRNA) with defined phenotypic readouts (ciliogenesis, spindle), single lab\",\n      \"pmids\": [\"22840364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A p.Leu171Pro missense mutation in POC1A causes abnormal centrosome number and distribution in patient cells, dispersed Golgi morphology, aberrant cholera-toxin trafficking from the plasma membrane to the Golgi, and accumulation of large cytosolic vesicles, demonstrating that POC1A is required for proper centrosome function and Golgi assembly/trafficking.\",\n      \"method\": \"Patient-derived cell analysis, immunofluorescence of centrosomes and Golgi, cholera-toxin trafficking assay\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cellular functional assays in patient cells with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"22840363\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A p.T120A missense mutation in POC1A causes formation of supernumerary centrosomes and multipolar spindles with abnormal chromosome arrangement in patient fibroblasts. This mutation is accompanied by alterations in the centrosome-associated WD repeat protein p80-katanin, implicating POC1A in regulating centriole number and spindle assembly upstream of or alongside p80-katanin.\",\n      \"method\": \"Patient primary fibroblast culture, immunofluorescence for centrosomes and mitotic spindles, gene expression array, co-analysis of p80-katanin\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct cellular assays in patient fibroblasts with multiple readouts (centrosome number, spindle structure, gene expression), single lab\",\n      \"pmids\": [\"26162852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Disruption of Poc1a in mice (by LINE-1-mediated insertion) causes impaired cilia formation and multipolar spindles in fibroblasts, defective spermatogenesis with progressive germ cell loss, and disorganized chondrocyte proliferative zone (chondrocytes fail to re-align after division and undergo increased apoptosis). Spermatogonial stem cell transplantation showed Poc1a is essential for both Sertoli cell and germ cell function.\",\n      \"method\": \"Mouse genetic model (spontaneous insertion mutant), cilia formation assay, spindle analysis, histology of growth plate, spermatogonial stem cell transplantation\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo loss-of-function mouse model with multiple orthogonal cellular and tissue-level phenotypic readouts, transplantation rescue experiment\",\n      \"pmids\": [\"26496357\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Patient cells with a frameshift mutation in POC1A exhibit increased centrosome amplification and multipolar spindle formation during mitosis, with normal DNA content (arguing against mitotic skipping or cell fusion). Centrosome clustering at mitotic spindles and in primary cilia partially mitigates centrosome amplification, and primary ciliary formation is normal in this specific mutation context.\",\n      \"method\": \"Patient-derived primary cell analysis, immunofluorescence for centrosomes, spindle, and primary cilia, DNA content analysis\",\n      \"journal\": \"Journal of molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct patient cell assays with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"26336158\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Loss of POC1A protein expression in patient fibroblasts and POC1A-deleted human adipose stem cells impairs ciliogenesis and adipocyte differentiation, induces cellular senescence, and leads to resistance to insulin and IGF-1. An altered subcellular localization of insulin receptors (and to a lesser extent IGF-1 receptors) was also observed, potentially contributing to hormone resistance.\",\n      \"method\": \"Patient fibroblasts, CRISPR-deleted human adipose stem cells, ciliogenesis assay, adipocyte differentiation assay, cellular senescence assay, insulin/IGF-1 signaling assays, receptor localization by immunofluorescence\",\n      \"journal\": \"European journal of endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cellular models (patient fibroblasts and gene-deleted stem cells) with several orthogonal functional readouts, single lab\",\n      \"pmids\": [\"38245004\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"POC1A promotes epithelial-mesenchymal transition (EMT) in triple-negative breast cancer cells, regulating invasion and metastasis in vitro and in vivo. RNA sequencing followed by experimental validation revealed that POC1A acts through activation of the STAT3 signaling pathway to induce EMT.\",\n      \"method\": \"RNA-seq pathway analysis, Western blot, RT-qPCR, immunofluorescence, migration/invasion assays, xenograft mouse models, STAT3 pathway inhibition/validation\",\n      \"journal\": \"Molecular medicine (Cambridge, Mass.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (RNA-seq, in vitro functional assays, in vivo xenograft) establishing pathway placement, single lab\",\n      \"pmids\": [\"40830747\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"POC1A is a WD40 repeat centriolar protein that forms heterodimers with POC1B to organize the centriole inner scaffold (together with POC5, FAM161A, and MDM1), and is required for centriole integrity, centriole duplication, mitotic spindle organization, ciliogenesis, and—in specific cellular contexts—adipocyte differentiation and insulin receptor localization; loss-of-function causes supernumerary/unstable centrioles, multipolar spindles, and defective cilia, while overexpression in cancer cells drives EMT via STAT3 signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"POC1A is a WD40-repeat centriolar protein that builds and stabilizes the centriole inner scaffold and is required for centriole integrity, duplication, mitotic spindle organization, and ciliogenesis [#0, #1]. It forms a heterodimer with POC1B in the centriole lumen, where the POC1A WD40 domain faces the lumen and interacts with POC5, while POC1B sits closer to the centriole wall; together with FAM161A and MDM1 this assembly organizes an inner scaffold interaction network, and the POC1A–POC5 interaction with POC5 tetramerization is essential for inner scaffold formation and centriole stability [#0]. POC1A and POC1B localize to centrioles and spindle poles and are stably incorporated into parental centrioles, with the two paralogs acting redundantly for incorporation into nascent centrioles—co-depletion, but not loss of either alone, abolishes centriole maturation and duplication and produces monopolar or unequal spindles [#1]. Loss-of-function in patient cells and mouse models causes centrosome amplification, multipolar spindles, and defective cilia, and in mice additionally disrupts spermatogenesis and chondrocyte organization in the growth plate [#2, #5, #6]. Human truncating and missense mutations in POC1A cause a developmental ciliopathy/skeletal phenotype, with patient cells showing abnormal centrosome number, defective ciliogenesis, and disrupted Golgi assembly and trafficking [#2, #3, #4]. In specific cellular contexts POC1A loss impairs adipocyte differentiation, induces senescence, and alters insulin-receptor localization producing insulin/IGF-1 resistance [#7], while its overexpression drives epithelial–mesenchymal transition in breast cancer cells through STAT3 signaling [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established that POC1A is a centriolar/spindle-pole protein functionally redundant with its paralog POC1B for centriole duplication and integrity, resolving whether the two POC1 proteins act independently.\",\n      \"evidence\": \"Isoform-specific antibodies and single/double RNAi depletion with live-cell imaging and incorporation assays in human cells\",\n      \"pmids\": [\"23015594\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Did not resolve the molecular architecture by which POC1A is incorporated into the centriole lumen\",\n        \"Differential mitotic phosphorylation of POC1B vs POC1A left functionally unexplained\",\n        \"No structural model of the POC1A interaction network\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Linked POC1A loss-of-function to a human disease phenotype by showing truncating mutations cause defective ciliogenesis and abnormal mitotic spindles, connecting centriole function to organismal pathology.\",\n      \"evidence\": \"Patient cell analysis plus siRNA knockdown in fibroblasts with cilia and spindle immunofluorescence\",\n      \"pmids\": [\"22840364\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single lab; ciliogenesis defect mechanism not dissected at molecular level\",\n        \"Did not address why centriole defects produce specific tissue phenotypes\"\n      ]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended POC1A function beyond centriole/spindle to Golgi assembly and membrane trafficking, showing a missense mutation disrupts centrosome number, Golgi morphology, and toxin trafficking.\",\n      \"evidence\": \"Patient-derived cells with centrosome/Golgi immunofluorescence and cholera-toxin trafficking assay\",\n      \"pmids\": [\"22840363\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether Golgi/trafficking defects are direct or secondary to centrosome dysfunction not established\",\n        \"Single missense allele; mechanism of trafficking link unknown\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated in vivo requirement for POC1A across multiple tissues, showing it is essential for cilia, spindle bipolarity, spermatogenesis, and chondrocyte organization.\",\n      \"evidence\": \"Mouse insertional mutant with cilia/spindle assays, growth-plate histology, and spermatogonial stem cell transplantation\",\n      \"pmids\": [\"26496357\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Tissue-specific molecular basis of germ cell and chondrocyte phenotypes not resolved\",\n        \"Did not map which centriole functions drive each tissue defect\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Refined the disease mechanism by showing distinct POC1A mutations cause supernumerary centrosomes and multipolar spindles, in one case implicating the regulator p80-katanin.\",\n      \"evidence\": \"Patient fibroblast immunofluorescence, gene expression array, and DNA-content and centrosome/spindle analyses\",\n      \"pmids\": [\"26162852\", \"26336158\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional relationship between POC1A and p80-katanin not directly tested\",\n        \"Variable ciliary phenotype across alleles unexplained\",\n        \"Centrosome clustering as compensatory mechanism not mechanistically dissected\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved the molecular architecture of the centriole inner scaffold, placing the POC1A–POC1B heterodimer at its core and defining the POC1A–POC5–FAM161A–MDM1 interaction network required for centriole stability.\",\n      \"evidence\": \"Co-IP/pulldown interaction mapping with domain-level localization and single/double genetic disruption\",\n      \"pmids\": [\"39543170\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"High-resolution structure of the assembled inner scaffold not determined\",\n        \"Order and regulation of scaffold assembly during the cell cycle unresolved\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Connected POC1A loss to metabolic dysfunction, showing impaired adipocyte differentiation, senescence, and mislocalized insulin receptors causing hormone resistance.\",\n      \"evidence\": \"Patient fibroblasts and CRISPR-deleted adipose stem cells with differentiation, senescence, signaling, and receptor-localization assays\",\n      \"pmids\": [\"38245004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanistic link between centriole/cilia defect and insulin-receptor mislocalization not established\",\n        \"Single lab; causality of senescence in hormone resistance unclear\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identified an oncogenic role for POC1A, showing overexpression drives EMT, invasion, and metastasis via STAT3 signaling in triple-negative breast cancer.\",\n      \"evidence\": \"RNA-seq, in vitro migration/invasion assays, xenograft models, and STAT3 pathway inhibition\",\n      \"pmids\": [\"40830747\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"How a centriolar protein activates STAT3 mechanistically not defined\",\n        \"Relationship between centriole function and EMT-promoting activity unknown\",\n        \"Single lab; cancer-type generality untested\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how POC1A's core centriole-scaffolding role mechanistically connects to its context-specific functions in Golgi trafficking, insulin-receptor localization, and STAT3-driven EMT.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No unifying mechanism linking centriole/cilia function to metabolic and oncogenic phenotypes\",\n        \"No structure of the assembled inner scaffold\",\n        \"Regulation of POC1A incorporation and turnover during the cell cycle uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005814\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\n      \"centriole inner scaffold (POC1A–POC1B–POC5–FAM161A–MDM1)\"\n    ],\n    \"partners\": [\n      \"POC1B\",\n      \"POC5\",\n      \"FAM161A\",\n      \"MDM1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}