{"gene":"BBS9","run_date":"2026-04-28T17:12:38","timeline":{"discoveries":[{"year":2005,"finding":"BBS9 (parathyroid hormone-responsive B1/PTHB1) was identified as a novel Bardet-Biedl syndrome gene through homozygosity mapping, comparative genomic analysis, and gene expression studies in BBS-knockout mice; homozygous mutations in BBS patients confirmed its causative role in BBS.","method":"Homozygosity mapping with SNP arrays, comparative genomics, gene expression profiling, mutation screening","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (genetics, expression, mutation analysis) with strong supporting evidence across patients","pmids":["16380913"],"is_preprint":false},{"year":2007,"finding":"BBS9 is a subunit of the BBSome, a stable complex of seven BBS proteins (BBS1, 2, 4, 5, 7, 8, 9) that localizes to centriolar satellites and the ciliary membrane and is required for ciliogenesis and ciliary membrane biogenesis; the BBSome cooperates with the Rab8 GEF to promote ciliary membrane extension.","method":"Affinity purification, mass spectrometry, co-immunoprecipitation, zebrafish knockdown phenotyping, immunofluorescence","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, highly cited foundational study replicated across labs","pmids":["17574030"],"is_preprint":false},{"year":2010,"finding":"BBSome assembly requires BBS6/BBS10/BBS12-CCT/TRiC chaperonin complex activity; BBS9 is part of the assembled BBSome whose formation depends on this chaperonin-mediated process.","method":"Co-immunoprecipitation, zebrafish knockdown, immunofluorescence, cell-based assembly assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, functional zebrafish model, multiple orthogonal methods","pmids":["20080638"],"is_preprint":false},{"year":2012,"finding":"BBS9 forms a core BBSome assembly intermediate with BBS7 and BBS2 (the 'BBSome core complex'), which serves as the nucleation scaffold onto which BBS1, BBS5, BBS8, and BBS4 are sequentially added; the BBS-chaperonin complex (BBS6/10/12) stabilizes BBS7 prior to its incorporation into the BBS7-BBS2-BBS9 core.","method":"Point mutagenesis, null allele analysis, co-immunoprecipitation to trap assembly intermediates, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis combined with biochemical trapping of assembly intermediates, multiple orthogonal approaches","pmids":["22500027"],"is_preprint":false},{"year":2012,"finding":"Knockdown of bbs9 in zebrafish causes developmental abnormalities including retinal defects, hydrocephaly, and reduced number and length of cilia in Kupffer's vesicle; knockdown of Bbs9 in mouse IMCD3 cells results in absence of cilia; a BBS patient-derived missense mutation in BBS9 fails to rescue the zebrafish morphant phenotype, demonstrating a conserved essential role in ciliogenesis.","method":"Antisense morpholino knockdown in zebrafish, siRNA knockdown in IMCD3 cells, mRNA rescue experiments, immunofluorescence","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — clean loss-of-function with specific cellular phenotype in two model systems, rescue with WT vs. mutant human mRNA","pmids":["22479622"],"is_preprint":false},{"year":2011,"finding":"LZTFL1 interacts with the BBSome (including BBS9 as a subunit) and regulates its ciliary trafficking; all BBSome subunits including BBS9 are required for BBSome ciliary entry, and BBSome-mediated ciliary trafficking of the Hedgehog signal transducer Smoothened depends on BBSome integrity.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish assays","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, multiple cell-based and in vivo knockdown assays with defined cargo trafficking readout","pmids":["22072986"],"is_preprint":false},{"year":2011,"finding":"BBS4 (a BBSome subunit) binds the N-terminal region of CEP290, and the BBSome (containing BBS9) co-localizes with CEP290 at the transition zone and centriolar satellites; loss of BBSome subunits disrupts CEP290 localization at centriolar satellites; genetic interaction between Bbs4 and Cep290(rd16) alleles in mice accelerates photoreceptor degeneration and increases body weight, demonstrating BBSome-CEP290 functional interaction.","method":"Co-immunoprecipitation, immunofluorescence, double-mutant mouse crosses, phenotypic analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — biochemical interaction plus in vivo genetic epistasis in mouse model","pmids":["23943788"],"is_preprint":false},{"year":2013,"finding":"BBS3 (ARL6) physically interacts with the endogenous BBSome (which contains BBS9) and both depend on each other for ciliary localization; loss of Bbs3 does not affect BBSome formation but disrupts normal localization of melanin concentrating hormone receptor 1 to ciliary membranes and affects retrograde transport of Smoothened in cilia.","method":"Co-immunoprecipitation of endogenous proteins, Bbs3 knockout mouse model, immunofluorescence, ciliary trafficking assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — endogenous Co-IP plus knockout mouse with defined ciliary cargo trafficking readout","pmids":["22139371"],"is_preprint":false},{"year":2014,"finding":"NPHP5 contains two separate BBS-binding sites and interacts with the BBSome to maintain its integrity; depletion of NPHP5 causes dissociation of BBS2 and BBS5 from the BBSome without affecting other subunits including BBS9, while Cep290 depletion causes additional loss of BBS8 — demonstrating that BBS9 remains in a stable sub-complex with BBS1, BBS4, BBS7, and BBS8 when BBS2/BBS5 are lost.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliary cargo trafficking assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP with domain-mapping mutants, multiple siRNA conditions defining BBSome sub-complex topology","pmids":["25552655"],"is_preprint":false},{"year":2014,"finding":"AZI1/CEP131 (a centriolar satellite protein) interacts with the BBSome through BBS4; AZI1 is not involved in BBSome assembly but regulates BBSome ciliary trafficking; depletion of AZI1 enhances BBSome accumulation in cilia and rescues BBSome ciliary trafficking in BBS3- or BBS5-depleted cells, demonstrating a regulatory role upstream of BBSome ciliary entry.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish morpholino knockdown","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — Co-IP with domain specificity, epistasis via double knockdown, in vivo zebrafish phenotypes","pmids":["24550735"],"is_preprint":false},{"year":2016,"finding":"Affinity proteomics of 217 tagged ciliary proteins identified BBS9 within a defined ciliary protein interaction landscape comprising 1,319 proteins and 4,905 interactions; BBS9-containing BBSome sub-complexes were validated biochemically and structurally predicted disruptive variants from ciliopathy patients were confirmed to perturb these interactions.","method":"Affinity purification–mass spectrometry, biochemical validation, genetic variant analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — large-scale AP-MS with biochemical validation and patient variant correlation","pmids":["27173435"],"is_preprint":false},{"year":2017,"finding":"Systematic yeast two-hybrid mutagenesis profiling across eight BBSome subunits including BBS9 identified >1,000 interaction-disrupting amino acid mutations; this defined amino-acid-resolution interaction determinants for BBS9 within the BBSome and provided a framework for interpreting patient-derived BBS9 mutations.","method":"Yeast two-hybrid 'off-switch' selection, massively parallel programmed mutagenesis, next-generation sequencing readout","journal":"Nature methods","confidence":"High","confidence_rationale":"Tier 1-2 — systematic mutagenesis at amino-acid resolution with sequencing readout, providing mechanistic interaction map","pmids":["29039417"],"is_preprint":false},{"year":2012,"finding":"A genome-wide association study identified a susceptibility locus for nonsyndromic sagittal craniosynostosis within a 167-kb region of BBS9, implicating BBS9 in skeletal/calvarial development independent of its ciliopathy role.","method":"Genome-wide association study with case-parent trios and replication cohort","journal":"Nature genetics","confidence":"Low","confidence_rationale":"Tier 4 — GWAS association, no direct mechanistic experiment on BBS9 protein function","pmids":["23160099"],"is_preprint":false},{"year":2018,"finding":"Long-read SMRT sequencing precisely mapped breakpoints of a homozygous BBS9 deletion (exons 1-4) in a patient with Bardet-Biedl syndrome, and determined that non-homologous end joining was the likely mechanism of formation; loss of BBS9 function (exons 1-4 deleted) produces the full BBS clinical phenotype.","method":"Chromosomal microarray, BBS gene panel sequencing, long-read SMRT sequencing","journal":"NPJ genomic medicine","confidence":"Medium","confidence_rationale":"Tier 3 — clinical genetics with structural variant characterization; functional consequence inferred from patient phenotype rather than direct molecular experiment","pmids":["29367880"],"is_preprint":false}],"current_model":"BBS9 is a core subunit of the BBSome, a seven-protein complex (BBS1/2/4/5/7/8/9) that traffics membrane proteins to the primary cilium; BBS9 forms a 'BBSome core complex' with BBS7 and BBS2 that nucleates sequential assembly of the complete BBSome (assisted by the BBS6/10/12-CCT/TRiC chaperonin complex), localizes to centriolar satellites and the ciliary membrane, and is required for ciliogenesis and ciliary trafficking of cargos including Smoothened and GPCRs, with its ciliary entry regulated by AZI1/CEP131, LZTFL1, and BBS3/ARL6, and its integrity maintained by transition zone proteins NPHP5 and CEP290."},"narrative":{"teleology":[{"year":2005,"claim":"Identification of BBS9 as a Bardet-Biedl syndrome gene established that PTHB1 functions in ciliopathy pathogenesis, linking a previously orphan locus to the BBS disease network.","evidence":"Homozygosity mapping with SNP arrays, comparative genomics, and mutation screening in BBS patients","pmids":["16380913"],"confidence":"High","gaps":["No protein-level function or interaction partners defined","Mechanism by which BBS9 loss causes BBS phenotypes unknown"]},{"year":2007,"claim":"Discovery of the BBSome as a stable seven-subunit complex containing BBS9 that localizes to centriolar satellites and ciliary membranes revealed BBS9's primary molecular context and established that the BBSome is required for ciliogenesis.","evidence":"Tandem affinity purification, mass spectrometry, co-immunoprecipitation, immunofluorescence, and zebrafish knockdown","pmids":["17574030"],"confidence":"High","gaps":["Order of BBSome assembly and specific role of BBS9 within the complex unknown","Ciliary cargo identity largely undefined"]},{"year":2010,"claim":"Demonstration that BBSome assembly requires the BBS6/10/12-CCT/TRiC chaperonin complex defined a quality-control step upstream of functional BBSome formation.","evidence":"Co-immunoprecipitation and zebrafish knockdown with assembly-state readouts","pmids":["20080638"],"confidence":"High","gaps":["Which BBSome subunits are direct chaperonin substrates remained unclear","Whether BBS9 itself requires chaperonin folding not tested"]},{"year":2011,"claim":"Identification of LZTFL1 and BBS3/ARL6 as regulators of BBSome ciliary trafficking, and Smoothened as a BBSome cargo, defined the pathway controlling ciliary entry and established a functional output of BBSome-mediated transport.","evidence":"Endogenous co-immunoprecipitation, Bbs3 knockout mouse, siRNA knockdowns with ciliary cargo trafficking readouts","pmids":["22072986","22139371"],"confidence":"High","gaps":["Whether LZTFL1 and ARL6 act at the same or distinct regulatory steps unresolved","Full spectrum of BBSome-dependent ciliary cargos not catalogued"]},{"year":2012,"claim":"Biochemical trapping of assembly intermediates revealed that BBS9 forms a core trimer with BBS2 and BBS7 that serves as the nucleation scaffold for sequential BBSome assembly, placing BBS9 at the earliest step of complex biogenesis.","evidence":"Point mutagenesis, null allele analysis, and co-immunoprecipitation of assembly intermediates","pmids":["22500027"],"confidence":"High","gaps":["Structural basis of BBS9-BBS2-BBS7 core interaction unknown","Whether the core trimer has independent function apart from scaffolding full BBSome not tested"]},{"year":2012,"claim":"Loss-of-function studies in zebrafish and mouse cells confirmed a conserved essential role for BBS9 in ciliogenesis and demonstrated that a patient-derived missense mutation is functionally null.","evidence":"Morpholino knockdown in zebrafish, siRNA in IMCD3 cells, mRNA rescue with wild-type versus mutant BBS9","pmids":["22479622"],"confidence":"High","gaps":["Mechanism by which BBS9 loss abolishes cilia not distinguished from general BBSome disruption","Cell-type specificity of ciliogenesis requirement not explored"]},{"year":2013,"claim":"Demonstration that BBS4 links the BBSome to CEP290 at the transition zone, and that genetic interaction between Bbs4 and Cep290 accelerates retinal degeneration, connected BBSome function to transition-zone gating.","evidence":"Co-immunoprecipitation, immunofluorescence at the transition zone, double-mutant mouse phenotyping","pmids":["23943788"],"confidence":"High","gaps":["Direct BBS9-CEP290 binding not tested","Mechanism by which transition-zone interaction facilitates cargo transport unclear"]},{"year":2014,"claim":"Identification of NPHP5 as a BBSome integrity factor and AZI1/CEP131 as a negative regulator of BBSome ciliary entry defined two distinct checkpoints—complex stability and ciliary gate access—both upstream of BBS9-containing BBSome function.","evidence":"Co-immunoprecipitation with domain-mapping, siRNA epistasis experiments, zebrafish morpholino knockdown","pmids":["25552655","24550735"],"confidence":"High","gaps":["How NPHP5 selectively stabilizes BBS2 and BBS5 while BBS9 remains in the sub-complex is structurally unexplained","Whether AZI1 directly contacts BBS9 or acts only through BBS4 not resolved"]},{"year":2016,"claim":"Large-scale ciliary interactome mapping placed BBS9 within a broader network of 4,905 interactions and confirmed that patient-derived variants in BBSome subunits disrupt specific interactions, validating the clinical relevance of the BBSome interaction architecture.","evidence":"Affinity purification–mass spectrometry of 217 ciliary proteins with biochemical validation and variant analysis","pmids":["27173435"],"confidence":"High","gaps":["Functional consequence of individual BBS9 interaction losses on cargo trafficking not measured","Stoichiometry of sub-complexes not determined"]},{"year":2017,"claim":"Amino-acid-resolution interaction profiling of all BBSome subunits mapped >1,000 interaction-disrupting mutations, creating a framework to interpret BBS9 patient variants mechanistically.","evidence":"Systematic yeast two-hybrid mutagenesis with next-generation sequencing readout","pmids":["29039417"],"confidence":"High","gaps":["Yeast two-hybrid interactions not all validated in mammalian cells","Structural model of full BBSome at atomic resolution not yet available at the time"]},{"year":null,"claim":"A high-resolution structural model of BBS9 within the assembled BBSome, the precise mechanism by which the BBS9-BBS2-BBS7 core nucleates assembly, and the full repertoire of BBSome-dependent ciliary cargos whose trafficking requires BBS9 remain to be defined.","evidence":"","pmids":[],"confidence":"High","gaps":["No atomic-resolution structure of BBS9 within the BBSome reported in this timeline","Cargo selectivity determinants on BBS9 not mapped","Whether BBS9 has functions independent of the BBSome is untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,3,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,5,7]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1,5,7,9]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1,6]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[1,4,5]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[1,5,7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,4,13]}],"complexes":["BBSome","BBSome core complex (BBS2-BBS7-BBS9)"],"partners":["BBS2","BBS7","BBS1","BBS4","BBS5","BBS8","LZTFL1","ARL6"],"other_free_text":[]},"mechanistic_narrative":"BBS9 is a core structural subunit of the BBSome, a hetero-octameric complex (BBS1/2/4/5/7/8/9) that mediates trafficking of membrane proteins—including GPCRs and the Hedgehog transducer Smoothened—to and from the primary cilium [PMID:17574030, PMID:22072986]. BBS9 nucleates BBSome assembly by forming a trimeric core with BBS2 and BBS7, onto which BBS1, BBS5, BBS8, and BBS4 are sequentially added in a process requiring the BBS6/10/12-CCT/TRiC chaperonin complex [PMID:22500027, PMID:20080638]. Ciliary entry of the BBS9-containing BBSome is regulated by ARL6/BBS3, LZTFL1, and AZI1/CEP131, while transition-zone proteins NPHP5 and CEP290 maintain BBSome integrity at the ciliary gate [PMID:22139371, PMID:24550735, PMID:25552655]. Loss-of-function mutations in BBS9 cause Bardet-Biedl syndrome, a ciliopathy characterized by retinal degeneration, obesity, and renal anomalies [PMID:16380913, PMID:22479622]."},"prefetch_data":{"uniprot":{"accession":"Q3SYG4","full_name":"Protein PTHB1","aliases":["Bardet-Biedl syndrome 9 protein","Parathyroid hormone-responsive B1 gene protein"],"length_aa":887,"mass_kda":99.3,"function":"The BBSome complex is thought to function as a coat complex required for sorting of specific membrane proteins to the primary cilia. The BBSome complex is required for ciliogenesis but is dispensable for centriolar satellite function. This ciliogenic function is mediated in part by the Rab8 GDP/GTP exchange factor, which localizes to the basal body and contacts the BBSome. Rab8(GTP) enters the primary cilium and promotes extension of the ciliary membrane. Firstly the BBSome associates with the ciliary membrane and binds to RAB3IP/Rabin8, the guanosyl exchange factor (GEF) for Rab8 and then the Rab8-GTP localizes to the cilium and promotes docking and fusion of carrier vesicles to the base of the ciliary membrane. Required for proper BBSome complex assembly and its ciliary localization","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cell projection, cilium membrane; Cytoplasm; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriolar satellite","url":"https://www.uniprot.org/uniprotkb/Q3SYG4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/BBS9","classification":"Not Classified","n_dependent_lines":7,"n_total_lines":1208,"dependency_fraction":0.005794701986754967},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/BBS9","total_profiled":1310},"omim":[{"mim_id":"615986","title":"BARDET-BIEDL SYNDROME 9; BBS9","url":"https://www.omim.org/entry/615986"},{"mim_id":"609884","title":"TRANSMEMBRANE PROTEIN 67; TMEM67","url":"https://www.omim.org/entry/609884"},{"mim_id":"608132","title":"TETRATRICOPEPTIDE REPEAT DOMAIN-CONTAINING PROTEIN 8; TTC8","url":"https://www.omim.org/entry/608132"},{"mim_id":"607968","title":"PARATHYROID HORMONE-RESPONSIVE B1 GENE","url":"https://www.omim.org/entry/607968"},{"mim_id":"607590","title":"BBS7 GENE; BBS7","url":"https://www.omim.org/entry/607590"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Primary cilium","reliability":"Supported"},{"location":"Primary cilium tip","reliability":"Supported"},{"location":"Primary cilium transition zone","reliability":"Supported"},{"location":"Flagellar centriole","reliability":"Supported"},{"location":"Mid piece","reliability":"Supported"},{"location":"Principal piece","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"},{"location":"Acrosome","reliability":"Additional"},{"location":"Equatorial segment","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/BBS9"},"hgnc":{"alias_symbol":["B1","PTHB1"],"prev_symbol":[]},"alphafold":{"accession":"Q3SYG4","domains":[{"cath_id":"2.130.10.10","chopping":"4-219_232-359","consensus_level":"medium","plddt":91.4994,"start":4,"end":359},{"cath_id":"2.60.40.1230","chopping":"410-530","consensus_level":"high","plddt":88.6637,"start":410,"end":530},{"cath_id":"3.30.310","chopping":"534-634","consensus_level":"high","plddt":88.2175,"start":534,"end":634},{"cath_id":"-","chopping":"642-820","consensus_level":"high","plddt":90.9858,"start":642,"end":820}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q3SYG4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q3SYG4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q3SYG4-F1-predicted_aligned_error_v6.png","plddt_mean":85.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=BBS9","jax_strain_url":"https://www.jax.org/strain/search?query=BBS9"},"sequence":{"accession":"Q3SYG4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q3SYG4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q3SYG4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q3SYG4"}},"corpus_meta":[{"pmid":"8063797","id":"PMC_8063797","title":"Expression 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A BBS patient-derived missense mutation in BBS9 fails to rescue the bbs9 morphant phenotype, establishing a direct functional requirement.\",\n      \"method\": \"Antisense morpholino knockdown in zebrafish; siRNA/shRNA knockdown in mouse IMCD3 cells; mRNA rescue experiments including patient-derived missense mutant\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KD in two model systems (zebrafish and mammalian cells) with specific ciliary phenotype, validated by human mRNA rescue and patient mutation\",\n      \"pmids\": [\"22479622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"BBS9 deletion (exons 1–4) causes Bardet-Biedl syndrome, confirming BBS9 is a disease-causing gene involved in primary cilia function; long-read SMRT sequencing mapped precise genomic breakpoints of the pathogenic deletion.\",\n      \"method\": \"Clinical chromosomal microarray, BBS gene panel sequencing, long-read SMRT sequencing (Pacific Biosciences) for breakpoint mapping\",\n      \"journal\": \"NPJ genomic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — genomic characterization of loss-of-function allele with clinical ciliopathy phenotype; mechanistic inference rests on prior functional work\",\n      \"pmids\": [\"29367880\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BBS9 (also called PTHB1) is a core component of the BBSome complex required for cilia biogenesis and/or ciliary protein trafficking; loss of BBS9 function in zebrafish and mammalian cells abolishes or severely reduces cilia formation, and homozygous loss-of-function mutations in humans cause Bardet-Biedl syndrome.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"BBS9 (parathyroid hormone-responsive B1/PTHB1) was identified as a novel Bardet-Biedl syndrome gene through homozygosity mapping, comparative genomic analysis, and gene expression studies in BBS-knockout mice; homozygous mutations in BBS patients confirmed its causative role in BBS.\",\n      \"method\": \"Homozygosity mapping with SNP arrays, comparative genomics, gene expression profiling, mutation screening\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genetics, expression, mutation analysis) with strong supporting evidence across patients\",\n      \"pmids\": [\"16380913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"BBS9 is a subunit of the BBSome, a stable complex of seven BBS proteins (BBS1, 2, 4, 5, 7, 8, 9) that localizes to centriolar satellites and the ciliary membrane and is required for ciliogenesis and ciliary membrane biogenesis; the BBSome cooperates with the Rab8 GEF to promote ciliary membrane extension.\",\n      \"method\": \"Affinity purification, mass spectrometry, co-immunoprecipitation, zebrafish knockdown phenotyping, immunofluorescence\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, highly cited foundational study replicated across labs\",\n      \"pmids\": [\"17574030\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"BBSome assembly requires BBS6/BBS10/BBS12-CCT/TRiC chaperonin complex activity; BBS9 is part of the assembled BBSome whose formation depends on this chaperonin-mediated process.\",\n      \"method\": \"Co-immunoprecipitation, zebrafish knockdown, immunofluorescence, cell-based assembly assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, functional zebrafish model, multiple orthogonal methods\",\n      \"pmids\": [\"20080638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"BBS9 forms a core BBSome assembly intermediate with BBS7 and BBS2 (the 'BBSome core complex'), which serves as the nucleation scaffold onto which BBS1, BBS5, BBS8, and BBS4 are sequentially added; the BBS-chaperonin complex (BBS6/10/12) stabilizes BBS7 prior to its incorporation into the BBS7-BBS2-BBS9 core.\",\n      \"method\": \"Point mutagenesis, null allele analysis, co-immunoprecipitation to trap assembly intermediates, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis combined with biochemical trapping of assembly intermediates, multiple orthogonal approaches\",\n      \"pmids\": [\"22500027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Knockdown of bbs9 in zebrafish causes developmental abnormalities including retinal defects, hydrocephaly, and reduced number and length of cilia in Kupffer's vesicle; knockdown of Bbs9 in mouse IMCD3 cells results in absence of cilia; a BBS patient-derived missense mutation in BBS9 fails to rescue the zebrafish morphant phenotype, demonstrating a conserved essential role in ciliogenesis.\",\n      \"method\": \"Antisense morpholino knockdown in zebrafish, siRNA knockdown in IMCD3 cells, mRNA rescue experiments, immunofluorescence\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with specific cellular phenotype in two model systems, rescue with WT vs. mutant human mRNA\",\n      \"pmids\": [\"22479622\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"LZTFL1 interacts with the BBSome (including BBS9 as a subunit) and regulates its ciliary trafficking; all BBSome subunits including BBS9 are required for BBSome ciliary entry, and BBSome-mediated ciliary trafficking of the Hedgehog signal transducer Smoothened depends on BBSome integrity.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish assays\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, multiple cell-based and in vivo knockdown assays with defined cargo trafficking readout\",\n      \"pmids\": [\"22072986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BBS4 (a BBSome subunit) binds the N-terminal region of CEP290, and the BBSome (containing BBS9) co-localizes with CEP290 at the transition zone and centriolar satellites; loss of BBSome subunits disrupts CEP290 localization at centriolar satellites; genetic interaction between Bbs4 and Cep290(rd16) alleles in mice accelerates photoreceptor degeneration and increases body weight, demonstrating BBSome-CEP290 functional interaction.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence, double-mutant mouse crosses, phenotypic analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — biochemical interaction plus in vivo genetic epistasis in mouse model\",\n      \"pmids\": [\"23943788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BBS3 (ARL6) physically interacts with the endogenous BBSome (which contains BBS9) and both depend on each other for ciliary localization; loss of Bbs3 does not affect BBSome formation but disrupts normal localization of melanin concentrating hormone receptor 1 to ciliary membranes and affects retrograde transport of Smoothened in cilia.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins, Bbs3 knockout mouse model, immunofluorescence, ciliary trafficking assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — endogenous Co-IP plus knockout mouse with defined ciliary cargo trafficking readout\",\n      \"pmids\": [\"22139371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NPHP5 contains two separate BBS-binding sites and interacts with the BBSome to maintain its integrity; depletion of NPHP5 causes dissociation of BBS2 and BBS5 from the BBSome without affecting other subunits including BBS9, while Cep290 depletion causes additional loss of BBS8 — demonstrating that BBS9 remains in a stable sub-complex with BBS1, BBS4, BBS7, and BBS8 when BBS2/BBS5 are lost.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, ciliary cargo trafficking assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP with domain-mapping mutants, multiple siRNA conditions defining BBSome sub-complex topology\",\n      \"pmids\": [\"25552655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"AZI1/CEP131 (a centriolar satellite protein) interacts with the BBSome through BBS4; AZI1 is not involved in BBSome assembly but regulates BBSome ciliary trafficking; depletion of AZI1 enhances BBSome accumulation in cilia and rescues BBSome ciliary trafficking in BBS3- or BBS5-depleted cells, demonstrating a regulatory role upstream of BBSome ciliary entry.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, zebrafish morpholino knockdown\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with domain specificity, epistasis via double knockdown, in vivo zebrafish phenotypes\",\n      \"pmids\": [\"24550735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Affinity proteomics of 217 tagged ciliary proteins identified BBS9 within a defined ciliary protein interaction landscape comprising 1,319 proteins and 4,905 interactions; BBS9-containing BBSome sub-complexes were validated biochemically and structurally predicted disruptive variants from ciliopathy patients were confirmed to perturb these interactions.\",\n      \"method\": \"Affinity purification–mass spectrometry, biochemical validation, genetic variant analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — large-scale AP-MS with biochemical validation and patient variant correlation\",\n      \"pmids\": [\"27173435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Systematic yeast two-hybrid mutagenesis profiling across eight BBSome subunits including BBS9 identified >1,000 interaction-disrupting amino acid mutations; this defined amino-acid-resolution interaction determinants for BBS9 within the BBSome and provided a framework for interpreting patient-derived BBS9 mutations.\",\n      \"method\": \"Yeast two-hybrid 'off-switch' selection, massively parallel programmed mutagenesis, next-generation sequencing readout\",\n      \"journal\": \"Nature methods\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — systematic mutagenesis at amino-acid resolution with sequencing readout, providing mechanistic interaction map\",\n      \"pmids\": [\"29039417\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A genome-wide association study identified a susceptibility locus for nonsyndromic sagittal craniosynostosis within a 167-kb region of BBS9, implicating BBS9 in skeletal/calvarial development independent of its ciliopathy role.\",\n      \"method\": \"Genome-wide association study with case-parent trios and replication cohort\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — GWAS association, no direct mechanistic experiment on BBS9 protein function\",\n      \"pmids\": [\"23160099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Long-read SMRT sequencing precisely mapped breakpoints of a homozygous BBS9 deletion (exons 1-4) in a patient with Bardet-Biedl syndrome, and determined that non-homologous end joining was the likely mechanism of formation; loss of BBS9 function (exons 1-4 deleted) produces the full BBS clinical phenotype.\",\n      \"method\": \"Chromosomal microarray, BBS gene panel sequencing, long-read SMRT sequencing\",\n      \"journal\": \"NPJ genomic medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — clinical genetics with structural variant characterization; functional consequence inferred from patient phenotype rather than direct molecular experiment\",\n      \"pmids\": [\"29367880\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"BBS9 is a core subunit of the BBSome, a seven-protein complex (BBS1/2/4/5/7/8/9) that traffics membrane proteins to the primary cilium; BBS9 forms a 'BBSome core complex' with BBS7 and BBS2 that nucleates sequential assembly of the complete BBSome (assisted by the BBS6/10/12-CCT/TRiC chaperonin complex), localizes to centriolar satellites and the ciliary membrane, and is required for ciliogenesis and ciliary trafficking of cargos including Smoothened and GPCRs, with its ciliary entry regulated by AZI1/CEP131, LZTFL1, and BBS3/ARL6, and its integrity maintained by transition zone proteins NPHP5 and CEP290.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"BBS9 (also known as PTHB1) is a component of the BBSome complex essential for cilia biogenesis; knockdown in zebrafish reduces cilia number and length in Kupffer's vesicle, while knockdown in mouse IMCD3 cells abolishes cilia entirely [PMID:22479622]. A BBS patient-derived missense mutation in BBS9 fails to rescue the ciliary phenotype, directly linking its molecular function to human disease [PMID:22479622]. Homozygous loss-of-function deletions in BBS9 cause Bardet-Biedl syndrome [PMID:29367880].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Whether BBS9 is functionally required for ciliogenesis was unknown; morpholino knockdown in zebrafish and siRNA knockdown in mammalian cells demonstrated that BBS9 loss abolishes or severely reduces cilia, and a patient-derived missense variant failed to rescue, establishing BBS9 as an essential ciliogenesis factor whose disruption underlies Bardet-Biedl syndrome.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish Kupffer's vesicle and shRNA/siRNA knockdown in mouse IMCD3 cells, with wild-type and mutant mRNA rescue\",\n      \"pmids\": [\"22479622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Precise molecular role of BBS9 within the BBSome (scaffolding, cargo recognition, etc.) not delineated\",\n        \"Whether BBS9 functions solely through the BBSome or has independent activities is untested\",\n        \"No structural information on BBS9 or its interaction interfaces within the complex\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The genomic architecture of pathogenic BBS9 deletions was undefined; long-read sequencing mapped precise breakpoints of an exon 1–4 deletion in a BBS patient, confirming BBS9 as a bona fide disease gene and revealing the mutational mechanism.\",\n      \"evidence\": \"Clinical microarray, gene panel sequencing, and Pacific Biosciences SMRT long-read sequencing for breakpoint resolution in a BBS family\",\n      \"pmids\": [\"29367880\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No genotype–phenotype correlation across different BBS9 allele classes\",\n        \"Functional consequence of partial versus complete BBS9 loss not compared\",\n        \"Mechanistic inference relies on prior functional studies rather than direct experimentation in this study\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The specific molecular activity of BBS9 within the BBSome — whether it serves as a structural scaffold, mediates cargo or membrane interactions, or contributes enzymatic function — remains uncharacterized by direct biochemical or structural experiments.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No reconstituted biochemical assay defining BBS9's direct molecular activity\",\n        \"No high-resolution structure of BBS9 within the BBSome\",\n        \"Ciliary cargo specificity conferred by BBS9 versus other BBSome subunits is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"BBSome\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"BBS9 is a core structural subunit of the BBSome, a hetero-octameric complex (BBS1/2/4/5/7/8/9) that mediates trafficking of membrane proteins—including GPCRs and the Hedgehog transducer Smoothened—to and from the primary cilium [PMID:17574030, PMID:22072986]. BBS9 nucleates BBSome assembly by forming a trimeric core with BBS2 and BBS7, onto which BBS1, BBS5, BBS8, and BBS4 are sequentially added in a process requiring the BBS6/10/12-CCT/TRiC chaperonin complex [PMID:22500027, PMID:20080638]. Ciliary entry of the BBS9-containing BBSome is regulated by ARL6/BBS3, LZTFL1, and AZI1/CEP131, while transition-zone proteins NPHP5 and CEP290 maintain BBSome integrity at the ciliary gate [PMID:22139371, PMID:24550735, PMID:25552655]. Loss-of-function mutations in BBS9 cause Bardet-Biedl syndrome, a ciliopathy characterized by retinal degeneration, obesity, and renal anomalies [PMID:16380913, PMID:22479622].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Identification of BBS9 as a Bardet-Biedl syndrome gene established that PTHB1 functions in ciliopathy pathogenesis, linking a previously orphan locus to the BBS disease network.\",\n      \"evidence\": \"Homozygosity mapping with SNP arrays, comparative genomics, and mutation screening in BBS patients\",\n      \"pmids\": [\"16380913\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No protein-level function or interaction partners defined\", \"Mechanism by which BBS9 loss causes BBS phenotypes unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Discovery of the BBSome as a stable seven-subunit complex containing BBS9 that localizes to centriolar satellites and ciliary membranes revealed BBS9's primary molecular context and established that the BBSome is required for ciliogenesis.\",\n      \"evidence\": \"Tandem affinity purification, mass spectrometry, co-immunoprecipitation, immunofluorescence, and zebrafish knockdown\",\n      \"pmids\": [\"17574030\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order of BBSome assembly and specific role of BBS9 within the complex unknown\", \"Ciliary cargo identity largely undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstration that BBSome assembly requires the BBS6/10/12-CCT/TRiC chaperonin complex defined a quality-control step upstream of functional BBSome formation.\",\n      \"evidence\": \"Co-immunoprecipitation and zebrafish knockdown with assembly-state readouts\",\n      \"pmids\": [\"20080638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which BBSome subunits are direct chaperonin substrates remained unclear\", \"Whether BBS9 itself requires chaperonin folding not tested\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of LZTFL1 and BBS3/ARL6 as regulators of BBSome ciliary trafficking, and Smoothened as a BBSome cargo, defined the pathway controlling ciliary entry and established a functional output of BBSome-mediated transport.\",\n      \"evidence\": \"Endogenous co-immunoprecipitation, Bbs3 knockout mouse, siRNA knockdowns with ciliary cargo trafficking readouts\",\n      \"pmids\": [\"22072986\", \"22139371\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LZTFL1 and ARL6 act at the same or distinct regulatory steps unresolved\", \"Full spectrum of BBSome-dependent ciliary cargos not catalogued\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Biochemical trapping of assembly intermediates revealed that BBS9 forms a core trimer with BBS2 and BBS7 that serves as the nucleation scaffold for sequential BBSome assembly, placing BBS9 at the earliest step of complex biogenesis.\",\n      \"evidence\": \"Point mutagenesis, null allele analysis, and co-immunoprecipitation of assembly intermediates\",\n      \"pmids\": [\"22500027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of BBS9-BBS2-BBS7 core interaction unknown\", \"Whether the core trimer has independent function apart from scaffolding full BBSome not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Loss-of-function studies in zebrafish and mouse cells confirmed a conserved essential role for BBS9 in ciliogenesis and demonstrated that a patient-derived missense mutation is functionally null.\",\n      \"evidence\": \"Morpholino knockdown in zebrafish, siRNA in IMCD3 cells, mRNA rescue with wild-type versus mutant BBS9\",\n      \"pmids\": [\"22479622\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which BBS9 loss abolishes cilia not distinguished from general BBSome disruption\", \"Cell-type specificity of ciliogenesis requirement not explored\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstration that BBS4 links the BBSome to CEP290 at the transition zone, and that genetic interaction between Bbs4 and Cep290 accelerates retinal degeneration, connected BBSome function to transition-zone gating.\",\n      \"evidence\": \"Co-immunoprecipitation, immunofluorescence at the transition zone, double-mutant mouse phenotyping\",\n      \"pmids\": [\"23943788\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct BBS9-CEP290 binding not tested\", \"Mechanism by which transition-zone interaction facilitates cargo transport unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of NPHP5 as a BBSome integrity factor and AZI1/CEP131 as a negative regulator of BBSome ciliary entry defined two distinct checkpoints—complex stability and ciliary gate access—both upstream of BBS9-containing BBSome function.\",\n      \"evidence\": \"Co-immunoprecipitation with domain-mapping, siRNA epistasis experiments, zebrafish morpholino knockdown\",\n      \"pmids\": [\"25552655\", \"24550735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NPHP5 selectively stabilizes BBS2 and BBS5 while BBS9 remains in the sub-complex is structurally unexplained\", \"Whether AZI1 directly contacts BBS9 or acts only through BBS4 not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Large-scale ciliary interactome mapping placed BBS9 within a broader network of 4,905 interactions and confirmed that patient-derived variants in BBSome subunits disrupt specific interactions, validating the clinical relevance of the BBSome interaction architecture.\",\n      \"evidence\": \"Affinity purification–mass spectrometry of 217 ciliary proteins with biochemical validation and variant analysis\",\n      \"pmids\": [\"27173435\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of individual BBS9 interaction losses on cargo trafficking not measured\", \"Stoichiometry of sub-complexes not determined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Amino-acid-resolution interaction profiling of all BBSome subunits mapped >1,000 interaction-disrupting mutations, creating a framework to interpret BBS9 patient variants mechanistically.\",\n      \"evidence\": \"Systematic yeast two-hybrid mutagenesis with next-generation sequencing readout\",\n      \"pmids\": [\"29039417\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Yeast two-hybrid interactions not all validated in mammalian cells\", \"Structural model of full BBSome at atomic resolution not yet available at the time\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structural model of BBS9 within the assembled BBSome, the precise mechanism by which the BBS9-BBS2-BBS7 core nucleates assembly, and the full repertoire of BBSome-dependent ciliary cargos whose trafficking requires BBS9 remain to be defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No atomic-resolution structure of BBS9 within the BBSome reported in this timeline\", \"Cargo selectivity determinants on BBS9 not mapped\", \"Whether BBS9 has functions independent of the BBSome is untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 3, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1, 5, 7, 9]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": []},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [1, 4, 5]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [1, 5, 7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 4, 13]}\n    ],\n    \"complexes\": [\n      \"BBSome\",\n      \"BBSome core complex (BBS2-BBS7-BBS9)\"\n    ],\n    \"partners\": [\n      \"BBS2\",\n      \"BBS7\",\n      \"BBS1\",\n      \"BBS4\",\n      \"BBS5\",\n      \"BBS8\",\n      \"LZTFL1\",\n      \"ARL6\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}