{"gene":"CYCS","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2016,"finding":"Megakaryocytes from patients carrying CYCS mutations (Thrombocytopenia Cargeeg) produce platelets by two distinct mechanisms: proplatelet-dependent release (yielding platelets with normal marginal microtubule coils) and a proplatelet-independent release into extravascular bone marrow space (yielding platelet-like structures lacking the marginal microtubule coil). The proplatelet-independent phenotype could not be recapitulated in vitro, indicating it depends on the interaction between CYCS-mutant megakaryocytes and their bone marrow microenvironment rather than being an intrinsic cell property.","method":"In vitro culture of megakaryocytes derived from peripheral blood of thrombocytopenia subjects; electron microscopy of bone marrow platelet-like structures; comparison of microtubule coil morphology between circulating platelets and extravascular platelet-like structures","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean loss-of-function model (patient-derived cells) with defined cellular phenotype and two orthogonal readouts (proplatelet formation assay, microtubule coil morphology), single lab","pmids":["27861742"],"is_preprint":false},{"year":2018,"finding":"A novel in-frame deletion in the CYCS C-terminal α-helix (p.Lys101del) causes thrombocytopenia by loss-of-function: in a yeast complementation model, this mutation resulted in significantly reduced cytochrome c protein expression and functional defects in the mitochondrial respiratory chain, establishing that cytochrome c loss-of-function underlies the thrombocytopenia phenotype.","method":"Yeast model system complementation; assessment of mitochondrial respiratory chain function; in silico structural analysis of protein folding stability; whole exome sequencing for variant identification","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast functional complementation with defined respiratory chain readout, plus structural modeling; single lab, two orthogonal methods","pmids":["30051457"],"is_preprint":false},{"year":2017,"finding":"Cytochrome c (CYCS) expression is upregulated during megakaryoblast differentiation induced by phorbol ester (PMA) and also increases with cell density. A concomitant increase in cytochrome c oxidase subunit II occurs with PMA but not with increased cell density, suggesting that upregulation of the mitochondrial respiratory chain is a specific feature of differentiation rather than density-dependent proliferation.","method":"Western blotting of endogenous cytochrome c and cytochrome c oxidase subunit II in megakaryoblastic cell lines (K562, Dami, MEG-01) under PMA-induced differentiation and varying cell densities","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, two orthogonal triggers (PMA differentiation, cell density), immunoblot readout; mechanistic inference from parallel respiratory chain subunit measurement","pmids":["29287084"],"is_preprint":false},{"year":2024,"finding":"A novel CYCS variant (p.Thr20Ile) introduced into a megakaryoblast cell line via CRISPR/Cas9 decreases CYCS protein expression, increases mitochondrial respiration and CD9 cell surface antigen expression, and unexpectedly abates caspase activation — contrasting with previously reported gain-of-function effects of other CYCS variants. This indicates the variant acts via loss-of-function with respect to caspase pathway activation, and suggests that caspase dysregulation may contribute to thrombocytopenia.","method":"CRISPR/Cas9-mediated gene editing in MEG-01 megakaryoblast cells; caspase activity assays; mitochondrial respiration measurement; flow cytometry for cell surface antigens and ploidy; Western blot for CYCS protein expression","journal":"British journal of haematology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — CRISPR knock-in in relevant cell line with multiple orthogonal functional readouts (caspase activity, mitochondrial respiration, protein expression, surface antigen), single lab","pmids":["39191490"],"is_preprint":false},{"year":2024,"finding":"miR-29b directly targets the 3'-UTR of CYCS mRNA (confirmed by dual-luciferase reporter assay), downregulating cytochrome c at both mRNA and protein levels. This leads to reactive oxygen species (ROS) accumulation in granulosa cells, which inhibits cumulus-oocyte complex (COC) expansion and oocyte maturation in vitro; overexpression of CYCS reverses ROS accumulation and rescues COC expansion.","method":"Dual-luciferase reporter assay with CYCS 3'-UTR; miR-29b mimic/knockdown in porcine granulosa cells; ROS measurement; COC expansion assay; oocyte maturation scoring; CYCS mRNA and protein quantification","journal":"Animal reproduction science","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct target validation by luciferase reporter plus bidirectional genetic manipulation (mimic and knockdown) with rescue by CYCS overexpression, multiple orthogonal readouts","pmids":["39342691"],"is_preprint":false},{"year":2021,"finding":"In yellow catfish, the CYCS promoter contains functional metal-responsive element (MRE) and HNF-1α binding sites. Zinc (Zn) decreases CYCS promoter activity and reduces CYCS mRNA and protein expression; MTF-1 and HNF-1α bind directly to the CYCS promoter and negatively regulate its activity, and Zn decreases HNF-1α binding to the CYCS promoter. This mechanism links Zn-mediated transcriptional repression of CYCS to reduced hepatocyte apoptosis.","method":"Promoter-reporter (luciferase) assay with deletion constructs; chromatin immunoprecipitation (ChIP) for MTF-1 and HNF-1α binding to CYCS promoter; Western blot and qRT-PCR for CYCS protein and mRNA; Annexin V-FITC/PI staining for apoptosis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus promoter-reporter assays with deletion analysis, single lab, teleost model","pmids":["34208159"],"is_preprint":false},{"year":2025,"finding":"In a mouse HFpEF model, the interaction between Apaf1 and Cycs (cytochrome c) is upregulated in cardiomyoblasts, driving apoptosis via the intrinsic mitochondrial pathway. Combined treatment with thymoquinone and aerobic exercise downregulates the Apaf1/Cycs interaction, thereby suppressing cardiomyocyte apoptosis. This interaction was demonstrated by co-immunoprecipitation.","method":"Co-immunoprecipitation of Apaf1 and Cycs in H9c2 cardiomyoblasts and mouse myocardium; TUNEL assay for apoptosis; HFpEF mouse model with L-NAME/high-fat diet","journal":"Frontiers in pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — co-IP establishes Apaf1/Cycs complex, single lab, single method for the binding interaction","pmids":["41142248"],"is_preprint":false},{"year":2024,"finding":"Computational structural analysis of disease-associated CYCS variants linked to thrombocytopenia-4 shows that all pathogenic variants occur at evolutionarily conserved sites. Molecular dynamics simulations (500 ns) reveal that these variants reduce protein stability, increase flexibility particularly in the Ω-loops, and displace Ω-loops away from the heme iron, weakening critical hydrogen bonds and opening the heme active site. Specific variants are predicted to affect phosphorylation sites (T20I, V21G, Y49H) and ubiquitination sites (G42S, A52T, A52V, T103I). This open heme conformation may enhance peroxidase activity and thereby promote apoptosis, contributing to reduced platelet production.","method":"Molecular dynamics simulation (500 ns); bioinformatics analysis of evolutionary conservation; in silico prediction of phosphorylation and ubiquitination sites","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational study only, no in vitro or in vivo experimental validation of the structural predictions","pmids":[],"is_preprint":true}],"current_model":"CYCS (cytochrome c, somatic) functions in the intrinsic apoptotic pathway by interacting with Apaf1 to activate caspases, and in mitochondrial electron transport; pathogenic CYCS mutations cause autosomal dominant thrombocytopenia-4 by reducing cytochrome c expression and impairing mitochondrial respiratory chain function, with some variants aberrantly suppressing caspase activation in megakaryoblasts, and CYCS expression is transcriptionally regulated during megakaryocyte differentiation and by zinc via HNF-1α and MTF-1 binding to its promoter, while post-transcriptionally it is targeted by miR-29b at its 3'-UTR to modulate ROS levels and oocyte maturation."},"narrative":{"mechanistic_narrative":"CYCS (cytochrome c, somatic) operates at the intersection of mitochondrial respiration and intrinsic apoptosis, and its dysfunction underlies autosomal dominant thrombocytopenia-4 [PMID:30051457, PMID:39191490]. In the apoptotic arm, cytochrome c physically associates with Apaf1 to drive the intrinsic mitochondrial death pathway; this Apaf1/Cycs interaction is upregulated in a cardiomyoblast HFpEF model and its reduction suppresses apoptosis [PMID:41142248]. Disease-associated CYCS variants act through loss of function: an in-frame C-terminal helix deletion (p.Lys101del) reduces cytochrome c protein and impairs the mitochondrial respiratory chain in a yeast complementation model [PMID:30051457], and a CRISPR knock-in of p.Thr20Ile in megakaryoblasts lowers CYCS protein while raising mitochondrial respiration and CD9 surface expression and, unexpectedly, dampens caspase activation — implicating caspase dysregulation in defective platelet production [PMID:39191490]. Consistent with a role in platelet biogenesis, cytochrome c is upregulated during megakaryoblast differentiation [PMID:29287084], and CYCS-mutant megakaryocytes produce platelets both by proplatelet-dependent release and by a microenvironment-dependent proplatelet-independent route [PMID:27861742]. CYCS expression is controlled transcriptionally — zinc represses the promoter through MTF-1 and HNF-1α binding, lowering cytochrome c and reducing hepatocyte apoptosis [PMID:34208159] — and post-transcriptionally by miR-29b, which targets the CYCS 3'-UTR to elevate ROS and impair oocyte maturation [PMID:39342691].","teleology":[{"year":2016,"claim":"Established that CYCS-mutant megakaryocytes generate platelets by two distinct routes, one of which depends on the bone marrow microenvironment, clarifying how cytochrome c dysfunction perturbs platelet production.","evidence":"In vitro culture of patient-derived megakaryocytes with electron microscopy and microtubule coil morphology comparison","pmids":["27861742"],"confidence":"Medium","gaps":["The molecular mechanism linking CYCS mutation to the proplatelet-independent route is not defined","The microenvironmental signal involved was not identified","The in vitro system could not recapitulate the proplatelet-independent phenotype"]},{"year":2017,"claim":"Showed cytochrome c is upregulated during megakaryoblast differentiation, tying CYCS respiratory-chain function to the differentiation program rather than mere proliferation.","evidence":"Western blotting of cytochrome c and cytochrome c oxidase subunit II in megakaryoblastic cell lines under PMA induction versus cell density","pmids":["29287084"],"confidence":"Medium","gaps":["The transcriptional regulators driving the differentiation-associated increase are not identified","Causal contribution of cytochrome c upregulation to differentiation was not tested"]},{"year":2018,"claim":"Demonstrated that a thrombocytopenia-associated CYCS C-terminal deletion causes loss of function, reducing cytochrome c expression and impairing respiratory chain activity.","evidence":"Yeast complementation with respiratory chain functional readout plus in silico folding analysis and whole exome sequencing","pmids":["30051457"],"confidence":"Medium","gaps":["Yeast model does not capture megakaryocyte-specific consequences","Effect on the apoptotic/caspase arm was not assessed"]},{"year":2021,"claim":"Defined transcriptional control of CYCS by zinc, showing MTF-1 and HNF-1α bind its promoter to repress expression and limit apoptosis.","evidence":"Promoter-luciferase deletion constructs and ChIP for MTF-1/HNF-1α with apoptosis staining in yellow catfish hepatocytes","pmids":["34208159"],"confidence":"Medium","gaps":["Conservation of this Zn/MTF-1/HNF-1α regulation in mammalian or megakaryocytic contexts is untested","Teleost model limits direct human relevance"]},{"year":2024,"claim":"Identified miR-29b as a direct post-transcriptional repressor of CYCS, linking reduced cytochrome c to ROS accumulation and impaired oocyte maturation.","evidence":"Dual-luciferase reporter, miR-29b mimic/knockdown, and CYCS overexpression rescue with ROS and COC expansion readouts in porcine granulosa cells","pmids":["39342691"],"confidence":"High","gaps":["Mechanism connecting cytochrome c level to ROS modulation is not resolved","Relevance to human reproduction or to platelet biology not established"]},{"year":2024,"claim":"Used a CRISPR knock-in to show the p.Thr20Ile variant acts by loss of function, lowering CYCS protein and caspase activation while altering respiration and differentiation markers.","evidence":"CRISPR/Cas9 knock-in in MEG-01 cells with caspase, respiration, surface antigen, ploidy and protein readouts","pmids":["39191490"],"confidence":"High","gaps":["Contrast with prior gain-of-function variants not mechanistically reconciled","How reduced caspase activation translates to reduced platelet output is not established"]},{"year":2025,"claim":"Demonstrated a physical Apaf1/Cycs interaction driving intrinsic apoptosis in a cardiac disease model, confirming the apoptosome partnership in vivo.","evidence":"Co-immunoprecipitation of Apaf1 and Cycs in H9c2 cardiomyoblasts and mouse myocardium with TUNEL in an HFpEF model","pmids":["41142248"],"confidence":"Medium","gaps":["Binding shown by single-method co-IP without reciprocal or structural validation","Direct causal link between the interaction and apoptosis was inferred from a pharmacologic intervention"]},{"year":null,"claim":"How CYCS pathogenic variants produce divergent effects on caspase activation (loss versus gain) and how these structural and biochemical changes mechanistically reduce platelet production in human megakaryocytes remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experimentally validated structure-function model reconciling variant effects","Megakaryocyte-specific apoptotic threshold governing platelet release not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[3,6]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[1,2]}],"complexes":["apoptosome"],"partners":["APAF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P99999","full_name":"Cytochrome c","aliases":[],"length_aa":105,"mass_kda":11.7,"function":"Electron carrier protein. The oxidized form of the cytochrome c heme group can accept an electron from the heme group of the cytochrome c1 subunit of cytochrome reductase. Cytochrome c then transfers this electron to the cytochrome oxidase complex, the final protein carrier in the mitochondrial electron-transport chain Plays a role in apoptosis. Suppression of the anti-apoptotic members or activation of the pro-apoptotic members of the Bcl-2 family leads to altered mitochondrial membrane permeability resulting in release of cytochrome c into the cytosol. Binding of cytochrome c to Apaf-1 triggers the activation of caspase-9, which then accelerates apoptosis by activating other caspases","subcellular_location":"Mitochondrion intermembrane space","url":"https://www.uniprot.org/uniprotkb/P99999/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CYCS","classification":"Common Essential","n_dependent_lines":1113,"n_total_lines":1208,"dependency_fraction":0.9213576158940397},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CYCS","total_profiled":1310},"omim":[{"mim_id":"620841","title":"INTRAFLAGELLAR TRANSPORT 25; IFT25","url":"https://www.omim.org/entry/620841"},{"mim_id":"618802","title":"tRNA-HISTIDINE GUANYLYLTRANSFERASE 1-LIKE PROTEIN; THG1L","url":"https://www.omim.org/entry/618802"},{"mim_id":"616695","title":"SERINE/THREONINE/TYROSINE-INTERACTING PROTEIN-LIKE 1; STYXL1","url":"https://www.omim.org/entry/616695"},{"mim_id":"616003","title":"CYTOCHROME C OXIDASE ASSEMBLY FACTOR 8; COA8","url":"https://www.omim.org/entry/616003"},{"mim_id":"615672","title":"MICRO RNA 497; MIR497","url":"https://www.omim.org/entry/615672"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"tongue","ntpm":746.5}],"url":"https://www.proteinatlas.org/search/CYCS"},"hgnc":{"alias_symbol":["HCS","CYC"],"prev_symbol":[]},"alphafold":{"accession":"P99999","domains":[{"cath_id":"1.10.760.10","chopping":"3-102","consensus_level":"high","plddt":98.3519,"start":3,"end":102}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P99999","model_url":"https://alphafold.ebi.ac.uk/files/AF-P99999-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P99999-F1-predicted_aligned_error_v6.png","plddt_mean":97.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CYCS","jax_strain_url":"https://www.jax.org/strain/search?query=CYCS"},"sequence":{"accession":"P99999","fasta_url":"https://rest.uniprot.org/uniprotkb/P99999.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P99999/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P99999"}},"corpus_meta":[{"pmid":"3001709","id":"PMC_3001709","title":"Each of three \"TATA elements\" specifies a subset of the transcription initiation sites at the CYC-1 promoter of Saccharomyces cerevisiae.","date":"1985","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/3001709","citation_count":308,"is_preprint":false},{"pmid":"6142891","id":"PMC_6142891","title":"The inhibitory guanine nucleotide-binding regulatory component of adenylate cyclase. Subunit dissociation and the inhibition of adenylate cyclase in S49 lymphoma cyc- and wild type membranes.","date":"1984","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/6142891","citation_count":240,"is_preprint":false},{"pmid":"10409723","id":"PMC_10409723","title":"PER and TIM inhibit the DNA binding activity of a Drosophila CLOCK-CYC/dBMAL1 heterodimer without disrupting formation of the heterodimer: a basis for circadian transcription.","date":"1999","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/10409723","citation_count":202,"is_preprint":false},{"pmid":"16754863","id":"PMC_16754863","title":"Phylogenetic analysis of the \"ECE\" (CYC/TB1) clade reveals duplications predating the core eudicots.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16754863","citation_count":151,"is_preprint":false},{"pmid":"6757248","id":"PMC_6757248","title":"Guanine nucleotide inhibition of cyc- S49 mouse lymphoma cell membrane adenylyl cyclase.","date":"1982","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/6757248","citation_count":129,"is_preprint":false},{"pmid":"10684876","id":"PMC_10684876","title":"dCLOCK is present in limiting amounts and likely mediates daily interactions between the dCLOCK-CYC transcription factor and the PER-TIM complex.","date":"2000","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/10684876","citation_count":107,"is_preprint":false},{"pmid":"22101417","id":"PMC_22101417","title":"Evolution and diversification of the CYC/TB1 gene family in Asteraceae--a comparative study in Gerbera (Mutisieae) and sunflower (Heliantheae).","date":"2011","source":"Molecular biology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/22101417","citation_count":100,"is_preprint":false},{"pmid":"6135205","id":"PMC_6135205","title":"Occurrence of a hormone-sensitive inhibitory coupling component of the adenylate cyclase in S49 lymphoma cyc- variants.","date":"1983","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/6135205","citation_count":95,"is_preprint":false},{"pmid":"18388203","id":"PMC_18388203","title":"Crystal structure and functional analysis of tetracenomycin ARO/CYC: implications for cyclization specificity of aromatic polyketides.","date":"2008","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/18388203","citation_count":83,"is_preprint":false},{"pmid":"9847140","id":"PMC_9847140","title":"Eco Cyc: encyclopedia of Escherichia coli genes and metabolism.","date":"1999","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/9847140","citation_count":65,"is_preprint":false},{"pmid":"6134642","id":"PMC_6134642","title":"Adenylate cyclase inhibition and GTPase stimulation by somatostatin in S49 lymphoma cyc- variants are prevented by islet-activating protein.","date":"1983","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/6134642","citation_count":60,"is_preprint":false},{"pmid":"2984267","id":"PMC_2984267","title":"Epinephrine-induced sequestration of the beta-adrenergic receptor in cultured S49 WT and cyc- lymphoma cells.","date":"1985","source":"Journal of cyclic nucleotide and protein phosphorylation research","url":"https://pubmed.ncbi.nlm.nih.gov/2984267","citation_count":57,"is_preprint":false},{"pmid":"18474612","id":"PMC_18474612","title":"Rhythmic E-box binding by CLK-CYC controls daily cycles in per and tim transcription and chromatin modifications.","date":"2008","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/18474612","citation_count":53,"is_preprint":false},{"pmid":"6685126","id":"PMC_6685126","title":"Inhibitory regulation of adenylyl cyclase in the absence of stimulatory regulation. 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Development","date":"2025-09-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.18.677011","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.19.604246","title":"High-throughput method rapidly characterizes hundreds of novel antibiotic resistance mutations","date":"2024-07-19","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.19.604246","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.10.08.681125","title":"Peripheral tissues of deep-sea mussels exhibit autonomous circadian timing via an atypical mechanism","date":"2025-10-08","source":"bioRxiv","url":"https://doi.org/10.1101/2025.10.08.681125","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.01.13.632323","title":"Expression of clock genes tracks daily and tidal time in brains of intertidal crustaceans  <i>Eurydice pulchra</i>  and  <i>Parhyale hawaiensis</i>","date":"2025-01-13","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.13.632323","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.08.674917","title":"Chemical genetics reveals  <i>Leishmania</i>  KKT2 and CRK9 kinase activity is required for cell cycle progression","date":"2025-09-12","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.08.674917","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":52561,"output_tokens":3185,"usd":0.102729,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9859,"output_tokens":2731,"usd":0.058785,"stage2_stop_reason":"end_turn"},"total_usd":0.161514,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify papers about CYCS (cytochrome c, somatic - the human/mammalian gene). \n\nMost papers in this corpus are about completely different genes that share \"CYC\" as a symbol:\n- Papers about S49 cyc- lymphoma cells (adenylate cyclase-deficient variant) - NOT CYCS\n- Papers about Drosophila CYC (CYCLE/dBMAL1, a circadian clock gene) - NOT CYCS\n- Papers about plant CYC/TB1 TCP transcription factors - NOT CYCS\n- Papers about yeast CYC1/CYC7 (iso-cytochrome c genes in yeast) - could be ortholog context\n- Papers about lycopene beta-cyclase (CYC-B) - NOT CYCS\n- Papers about CYC-202 (CDK inhibitor drug) - NOT CYCS\n\nPapers that ARE about CYCS (cytochrome c, somatic):\n- PMID:27861742 - CYCS mutation thrombocytopenia, megakaryocyte platelet release\n- PMID:30051457 - Novel CYCS mutation, yeast model, mitochondrial respiratory chain\n- PMID:29287084 - CYCS expression in megakaryoblastic cells, differentiation\n- PMID:35126455 - Novel CYCS variant, thrombocytopenia\n- PMID:39191490 - Novel CYCS variant, caspase activity\n- PMID:37515387 - Medicarpin, CYCS upregulation in apoptosis\n- PMID:30773504 - miR-182-5p/BCL10/CYCS\n- PMID:39342691 - miR-29b targets CYCS 3'UTR\n- PMID:34208159 - CYCS promoter characterization in catfish\n- PMID:33346968 - Review on CYCS in male germ cells\n- PMID:41142248 - Apaf1/Cycs axis, co-IP\n- PMID:41218956 - CYCS thrombocytopenia case\n- PMID:41676885 - CYCS p.Arg92Gly thrombocytopenia\n- PMID:41455048 - CYCS thrombocytopenia Japanese families\n- bio_10.1101_2024.07.24.604913 - computational study of Cyt-c variants\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2016,\n      \"finding\": \"Megakaryocytes from patients carrying CYCS mutations (Thrombocytopenia Cargeeg) produce platelets by two distinct mechanisms: proplatelet-dependent release (yielding platelets with normal marginal microtubule coils) and a proplatelet-independent release into extravascular bone marrow space (yielding platelet-like structures lacking the marginal microtubule coil). The proplatelet-independent phenotype could not be recapitulated in vitro, indicating it depends on the interaction between CYCS-mutant megakaryocytes and their bone marrow microenvironment rather than being an intrinsic cell property.\",\n      \"method\": \"In vitro culture of megakaryocytes derived from peripheral blood of thrombocytopenia subjects; electron microscopy of bone marrow platelet-like structures; comparison of microtubule coil morphology between circulating platelets and extravascular platelet-like structures\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean loss-of-function model (patient-derived cells) with defined cellular phenotype and two orthogonal readouts (proplatelet formation assay, microtubule coil morphology), single lab\",\n      \"pmids\": [\"27861742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A novel in-frame deletion in the CYCS C-terminal α-helix (p.Lys101del) causes thrombocytopenia by loss-of-function: in a yeast complementation model, this mutation resulted in significantly reduced cytochrome c protein expression and functional defects in the mitochondrial respiratory chain, establishing that cytochrome c loss-of-function underlies the thrombocytopenia phenotype.\",\n      \"method\": \"Yeast model system complementation; assessment of mitochondrial respiratory chain function; in silico structural analysis of protein folding stability; whole exome sequencing for variant identification\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast functional complementation with defined respiratory chain readout, plus structural modeling; single lab, two orthogonal methods\",\n      \"pmids\": [\"30051457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cytochrome c (CYCS) expression is upregulated during megakaryoblast differentiation induced by phorbol ester (PMA) and also increases with cell density. A concomitant increase in cytochrome c oxidase subunit II occurs with PMA but not with increased cell density, suggesting that upregulation of the mitochondrial respiratory chain is a specific feature of differentiation rather than density-dependent proliferation.\",\n      \"method\": \"Western blotting of endogenous cytochrome c and cytochrome c oxidase subunit II in megakaryoblastic cell lines (K562, Dami, MEG-01) under PMA-induced differentiation and varying cell densities\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, two orthogonal triggers (PMA differentiation, cell density), immunoblot readout; mechanistic inference from parallel respiratory chain subunit measurement\",\n      \"pmids\": [\"29287084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A novel CYCS variant (p.Thr20Ile) introduced into a megakaryoblast cell line via CRISPR/Cas9 decreases CYCS protein expression, increases mitochondrial respiration and CD9 cell surface antigen expression, and unexpectedly abates caspase activation — contrasting with previously reported gain-of-function effects of other CYCS variants. This indicates the variant acts via loss-of-function with respect to caspase pathway activation, and suggests that caspase dysregulation may contribute to thrombocytopenia.\",\n      \"method\": \"CRISPR/Cas9-mediated gene editing in MEG-01 megakaryoblast cells; caspase activity assays; mitochondrial respiration measurement; flow cytometry for cell surface antigens and ploidy; Western blot for CYCS protein expression\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — CRISPR knock-in in relevant cell line with multiple orthogonal functional readouts (caspase activity, mitochondrial respiration, protein expression, surface antigen), single lab\",\n      \"pmids\": [\"39191490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"miR-29b directly targets the 3'-UTR of CYCS mRNA (confirmed by dual-luciferase reporter assay), downregulating cytochrome c at both mRNA and protein levels. This leads to reactive oxygen species (ROS) accumulation in granulosa cells, which inhibits cumulus-oocyte complex (COC) expansion and oocyte maturation in vitro; overexpression of CYCS reverses ROS accumulation and rescues COC expansion.\",\n      \"method\": \"Dual-luciferase reporter assay with CYCS 3'-UTR; miR-29b mimic/knockdown in porcine granulosa cells; ROS measurement; COC expansion assay; oocyte maturation scoring; CYCS mRNA and protein quantification\",\n      \"journal\": \"Animal reproduction science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct target validation by luciferase reporter plus bidirectional genetic manipulation (mimic and knockdown) with rescue by CYCS overexpression, multiple orthogonal readouts\",\n      \"pmids\": [\"39342691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In yellow catfish, the CYCS promoter contains functional metal-responsive element (MRE) and HNF-1α binding sites. Zinc (Zn) decreases CYCS promoter activity and reduces CYCS mRNA and protein expression; MTF-1 and HNF-1α bind directly to the CYCS promoter and negatively regulate its activity, and Zn decreases HNF-1α binding to the CYCS promoter. This mechanism links Zn-mediated transcriptional repression of CYCS to reduced hepatocyte apoptosis.\",\n      \"method\": \"Promoter-reporter (luciferase) assay with deletion constructs; chromatin immunoprecipitation (ChIP) for MTF-1 and HNF-1α binding to CYCS promoter; Western blot and qRT-PCR for CYCS protein and mRNA; Annexin V-FITC/PI staining for apoptosis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus promoter-reporter assays with deletion analysis, single lab, teleost model\",\n      \"pmids\": [\"34208159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In a mouse HFpEF model, the interaction between Apaf1 and Cycs (cytochrome c) is upregulated in cardiomyoblasts, driving apoptosis via the intrinsic mitochondrial pathway. Combined treatment with thymoquinone and aerobic exercise downregulates the Apaf1/Cycs interaction, thereby suppressing cardiomyocyte apoptosis. This interaction was demonstrated by co-immunoprecipitation.\",\n      \"method\": \"Co-immunoprecipitation of Apaf1 and Cycs in H9c2 cardiomyoblasts and mouse myocardium; TUNEL assay for apoptosis; HFpEF mouse model with L-NAME/high-fat diet\",\n      \"journal\": \"Frontiers in pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — co-IP establishes Apaf1/Cycs complex, single lab, single method for the binding interaction\",\n      \"pmids\": [\"41142248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Computational structural analysis of disease-associated CYCS variants linked to thrombocytopenia-4 shows that all pathogenic variants occur at evolutionarily conserved sites. Molecular dynamics simulations (500 ns) reveal that these variants reduce protein stability, increase flexibility particularly in the Ω-loops, and displace Ω-loops away from the heme iron, weakening critical hydrogen bonds and opening the heme active site. Specific variants are predicted to affect phosphorylation sites (T20I, V21G, Y49H) and ubiquitination sites (G42S, A52T, A52V, T103I). This open heme conformation may enhance peroxidase activity and thereby promote apoptosis, contributing to reduced platelet production.\",\n      \"method\": \"Molecular dynamics simulation (500 ns); bioinformatics analysis of evolutionary conservation; in silico prediction of phosphorylation and ubiquitination sites\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational study only, no in vitro or in vivo experimental validation of the structural predictions\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"CYCS (cytochrome c, somatic) functions in the intrinsic apoptotic pathway by interacting with Apaf1 to activate caspases, and in mitochondrial electron transport; pathogenic CYCS mutations cause autosomal dominant thrombocytopenia-4 by reducing cytochrome c expression and impairing mitochondrial respiratory chain function, with some variants aberrantly suppressing caspase activation in megakaryoblasts, and CYCS expression is transcriptionally regulated during megakaryocyte differentiation and by zinc via HNF-1α and MTF-1 binding to its promoter, while post-transcriptionally it is targeted by miR-29b at its 3'-UTR to modulate ROS levels and oocyte maturation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CYCS (cytochrome c, somatic) operates at the intersection of mitochondrial respiration and intrinsic apoptosis, and its dysfunction underlies autosomal dominant thrombocytopenia-4 [#1, #3]. In the apoptotic arm, cytochrome c physically associates with Apaf1 to drive the intrinsic mitochondrial death pathway; this Apaf1/Cycs interaction is upregulated in a cardiomyoblast HFpEF model and its reduction suppresses apoptosis [#6]. Disease-associated CYCS variants act through loss of function: an in-frame C-terminal helix deletion (p.Lys101del) reduces cytochrome c protein and impairs the mitochondrial respiratory chain in a yeast complementation model [#1], and a CRISPR knock-in of p.Thr20Ile in megakaryoblasts lowers CYCS protein while raising mitochondrial respiration and CD9 surface expression and, unexpectedly, dampens caspase activation \\u2014 implicating caspase dysregulation in defective platelet production [#3]. Consistent with a role in platelet biogenesis, cytochrome c is upregulated during megakaryoblast differentiation [#2], and CYCS-mutant megakaryocytes produce platelets both by proplatelet-dependent release and by a microenvironment-dependent proplatelet-independent route [#0]. CYCS expression is controlled transcriptionally \\u2014 zinc represses the promoter through MTF-1 and HNF-1\\u03b1 binding, lowering cytochrome c and reducing hepatocyte apoptosis [#5] \\u2014 and post-transcriptionally by miR-29b, which targets the CYCS 3'-UTR to elevate ROS and impair oocyte maturation [#4].\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that CYCS-mutant megakaryocytes generate platelets by two distinct routes, one of which depends on the bone marrow microenvironment, clarifying how cytochrome c dysfunction perturbs platelet production.\",\n      \"evidence\": \"In vitro culture of patient-derived megakaryocytes with electron microscopy and microtubule coil morphology comparison\",\n      \"pmids\": [\"27861742\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The molecular mechanism linking CYCS mutation to the proplatelet-independent route is not defined\", \"The microenvironmental signal involved was not identified\", \"The in vitro system could not recapitulate the proplatelet-independent phenotype\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed cytochrome c is upregulated during megakaryoblast differentiation, tying CYCS respiratory-chain function to the differentiation program rather than mere proliferation.\",\n      \"evidence\": \"Western blotting of cytochrome c and cytochrome c oxidase subunit II in megakaryoblastic cell lines under PMA induction versus cell density\",\n      \"pmids\": [\"29287084\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The transcriptional regulators driving the differentiation-associated increase are not identified\", \"Causal contribution of cytochrome c upregulation to differentiation was not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that a thrombocytopenia-associated CYCS C-terminal deletion causes loss of function, reducing cytochrome c expression and impairing respiratory chain activity.\",\n      \"evidence\": \"Yeast complementation with respiratory chain functional readout plus in silico folding analysis and whole exome sequencing\",\n      \"pmids\": [\"30051457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Yeast model does not capture megakaryocyte-specific consequences\", \"Effect on the apoptotic/caspase arm was not assessed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined transcriptional control of CYCS by zinc, showing MTF-1 and HNF-1\\u03b1 bind its promoter to repress expression and limit apoptosis.\",\n      \"evidence\": \"Promoter-luciferase deletion constructs and ChIP for MTF-1/HNF-1\\u03b1 with apoptosis staining in yellow catfish hepatocytes\",\n      \"pmids\": [\"34208159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Conservation of this Zn/MTF-1/HNF-1\\u03b1 regulation in mammalian or megakaryocytic contexts is untested\", \"Teleost model limits direct human relevance\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified miR-29b as a direct post-transcriptional repressor of CYCS, linking reduced cytochrome c to ROS accumulation and impaired oocyte maturation.\",\n      \"evidence\": \"Dual-luciferase reporter, miR-29b mimic/knockdown, and CYCS overexpression rescue with ROS and COC expansion readouts in porcine granulosa cells\",\n      \"pmids\": [\"39342691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting cytochrome c level to ROS modulation is not resolved\", \"Relevance to human reproduction or to platelet biology not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Used a CRISPR knock-in to show the p.Thr20Ile variant acts by loss of function, lowering CYCS protein and caspase activation while altering respiration and differentiation markers.\",\n      \"evidence\": \"CRISPR/Cas9 knock-in in MEG-01 cells with caspase, respiration, surface antigen, ploidy and protein readouts\",\n      \"pmids\": [\"39191490\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contrast with prior gain-of-function variants not mechanistically reconciled\", \"How reduced caspase activation translates to reduced platelet output is not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Demonstrated a physical Apaf1/Cycs interaction driving intrinsic apoptosis in a cardiac disease model, confirming the apoptosome partnership in vivo.\",\n      \"evidence\": \"Co-immunoprecipitation of Apaf1 and Cycs in H9c2 cardiomyoblasts and mouse myocardium with TUNEL in an HFpEF model\",\n      \"pmids\": [\"41142248\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding shown by single-method co-IP without reciprocal or structural validation\", \"Direct causal link between the interaction and apoptosis was inferred from a pharmacologic intervention\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CYCS pathogenic variants produce divergent effects on caspase activation (loss versus gain) and how these structural and biochemical changes mechanistically reduce platelet production in human megakaryocytes remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experimentally validated structure-function model reconciling variant effects\", \"Megakaryocyte-specific apoptotic threshold governing platelet release not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\"apoptosome\"],\n    \"partners\": [\"APAF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}