{"gene":"PROC","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":2012,"finding":"The PROC c.574_576del in-frame deletion variant produces a protein C with markedly reduced anticoagulant activity (43.6% of wild-type) while retaining near-normal amidolytic activity, demonstrating a type II (functional) defect. In vitro expression studies established that the anticoagulant defect is intrinsic to the mutant protein.","method":"In vitro expression in cell lines, functional amidolytic and anticoagulant activity assays","journal":"Journal of thrombosis and haemostasis : JTH","confidence":"Medium","confidence_rationale":"Tier 1-2 — direct in vitro functional assay with defined activity readout; single lab, single study","pmids":["22817391"],"is_preprint":false},{"year":2000,"finding":"An intronic regulatory element located >500 bp downstream of the core promoter within intron 1 of the human PROC gene enhances promoter-driven expression in human hepatoma cells. A 142 bp sequence within this element is required for high-level expression; a duplicate copy of this element is also present upstream. Transcription factor HNF-1 represses (rather than activates) the promoter when coupled to the intronic sequence.","method":"Transient transfection of PROC promoter-luciferase reporter constructs in human hepatoma cells; conventional alignment and complexity analysis to identify conserved regions","journal":"Human genetics","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay with deletion mapping and transcription factor perturbation; single lab, moderate evidence","pmids":["11140943"],"is_preprint":false},{"year":1995,"finding":"Polymorphic haplotypes in the human PROC gene promoter (T/A vs C/G at two linked diallelic sites) differentially drive transcription: the T/A haplotype exhibits at least 2-fold higher transcription efficiency than the C/G haplotype in HepG2 hepatoma cells.","method":"Transient transfection of PROC promoter-luciferase reporter constructs in HepG2 cells","journal":"Blood coagulation & fibrinolysis","confidence":"Medium","confidence_rationale":"Tier 2 — reporter assay directly measuring promoter activity; single lab, single method","pmids":["7548679"],"is_preprint":false},{"year":1996,"finding":"Nonsense mutations, frameshift deletions, and splice-site mutations in the PROC gene are frequently subject to allelic exclusion at the mRNA level (NMD-like mechanism), with only normal-allele-derived mRNA detected by RT-PCR/sequencing; one 2-bp insertion instead generated a cryptic splice site producing an aberrant mRNA with a premature stop codon rather than allelic exclusion.","method":"RT-PCR and direct sequencing of ectopic PROC transcripts from patient lymphocytes; polymorphism analysis to confirm allele-specific exclusion","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 — mRNA analysis with allele-specific confirmation in multiple patients; single lab","pmids":["8822578"],"is_preprint":false},{"year":2002,"finding":"The D180G missense mutation in the protease domain of protein C causes a severe reduction in secretion (79% decrease vs wild-type) without altering intracellular protein content, consistent with protein misfolding and intracellular retention/degradation. Structural modelling of the X-ray structure of activated protein C predicted local destabilisation by the mutation.","method":"Transient expression of PROC mutant in HK-293 cells with ELISA of culture media and cell lysates; computational structural analysis using X-ray structure of activated protein C","journal":"Thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro expression with secretion assay plus structural modelling; single lab, moderate","pmids":["12362235"],"is_preprint":false},{"year":2019,"finding":"The PROC p.Ala178Pro missense variant causes type I protein C deficiency by reducing secretion of the protein C antigen from cells, as demonstrated by in vitro cell studies showing consistently reduced PROC antigen concentration in media from mutant-transfected cells relative to controls.","method":"In vitro cell line expression with PROC antigen measurement in conditioned media; clinical plasma protein C activity measurement in variant carriers","journal":"Journal of cellular and molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro secretion assay supported by clinical phenotype data; single lab","pmids":["31338992"],"is_preprint":false},{"year":2024,"finding":"The PROC p.Gly334Ser missense variant significantly decreases protein C secretion into culture media from HEK293T cells (but not from Huh-7 cells), without reducing intracellular protein C levels, indicating impaired secretion as the pathogenic mechanism. Western blot confirmed expression levels in cell lysates were not significantly altered.","method":"Transfection of PROC expression vectors into Huh-7 and HEK293T cells; Western blot of cell lysates and conditioned media","journal":"American heart journal plus : cardiology research and practice","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro secretion assay with two cell lines; single lab","pmids":["40008275"],"is_preprint":false},{"year":2022,"finding":"The PROC p.Gly86Asp variant impairs secretion of protein C without altering mRNA transcription levels: mutant PC antigen was 81.3% of wild-type in culture supernatant but 110% in cell lysate, indicating intracellular retention as the molecular mechanism of type I PC deficiency.","method":"qRT-PCR for mRNA level; ELISA for PC antigen in supernatant and lysate; Western blot for protein level in HEK 293FT cells transfected with wild-type or mutant PROC","journal":"Zhonghua yi xue yi chuan xue za zhi","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (qRT-PCR, ELISA, Western blot) in single lab","pmids":["35810421"],"is_preprint":false},{"year":2024,"finding":"PROC missense mutations N355S, G392E, and T314A cause functional defects in protein C by reducing substrate binding affinity (increased Km) and catalytic rate (decreased Vmax) in enzyme kinetics assays; T314A additionally reduces secretion. Structural modelling showed spatial collisions introduced by substitutions distort the active site region.","method":"Transient transfection of HEK293 cells; real-time PCR for mRNA; ELISA and Western blot for protein levels; enzyme kinetics (Km, Vmax) assay; PyMOL structural modelling","journal":"Zhongguo shi yan xue ye xue za zhi","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro enzyme kinetics plus secretion assay plus structural modelling; single lab","pmids":["39743273"],"is_preprint":false},{"year":2026,"finding":"The PROC p.Trp414Arg variant causes near-complete loss of protein C activity (0% vs 90% for wild-type) and nearly absent secretion (4% vs 100%) when expressed in Expi293F cells, confirming a quantitative (type I) protein C deficiency. Thrombin generation assays in FVIII-deficient plasma showed that reduced protein C concentrations increase thrombin generation upon thrombomodulin addition, demonstrating that PC deficiency attenuates bleeding in hemophilia A by improving thrombin generation.","method":"Recombinant protein production in Expi293F cells; chromogenic activity assay; competitive ELISA for protein quantity; thrombin generation assays in factor VIII-deficient plasma with varying PC concentrations; AlphaFold 3 structural prediction","journal":"Journal of thrombosis and haemostasis : JTH","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro reconstitution with functional activity assay and thrombin generation; single lab, multiple orthogonal methods","pmids":["41791668"],"is_preprint":false},{"year":2026,"finding":"Multiple PROC variants at exon-intron boundaries induce complex splicing defects (exon skipping, cryptic donor site activation, multiple aberrant isoforms). Engineered U1 and U7 snRNAs partially restore normal splicing in affected variants, demonstrating feasibility of splice-directed RNA therapeutic correction of PROC splice-site mutations.","method":"Minigene splicing assays in HeLa and Huh7 cells; engineered U1/U7 snRNA rescue experiments; in silico splice prediction (SpliceAI and four other tools); protein expression, secretion, and activity analyses","journal":"Journal of thrombosis and haemostasis : JTH","confidence":"High","confidence_rationale":"Tier 1-2 — minigene splicing assays with snRNA rescue in two cell lines plus protein-level validation; multiple orthogonal methods in single study","pmids":["41791661"],"is_preprint":false},{"year":2025,"finding":"Deep intronic PROC substitutions (c.237+75G>A, c.535+936C>T, c.536-95G>A, c.796+49G>T) cause pathogenic splicing defects including intron retention in mature mRNA or pseudo-exon activation, identified by in vitro splicing assays in HeLa and Huh7 cells; a 541 bp deletion and a 1.298 kb balanced inversion also disrupt the PROC gene and are classified as pathogenic.","method":"Whole PROC gene NGS; in vitro minigene splicing assay in HeLa and Huh7 cells; in silico analysis (MaxEntScan and SpliceAI)","journal":"Thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro splicing functional assay in two cell lines, validated in multiple patients; single lab but multiple orthogonal methods","pmids":["40789311"],"is_preprint":false},{"year":1993,"finding":"A Gla domain missense mutation Arg15→Trp (CGG→TGG) in the PROC gene causes type II protein C deficiency (reduced anticoagulant function with preserved antigen), implicating the conserved pentapeptide in the Gla domain in functional calcium-dependent membrane binding of protein C.","method":"DNA sequencing; family co-segregation analysis; phenotypic classification (antigen vs. functional activity)","journal":"Blood coagulation & fibrinolysis","confidence":"Low","confidence_rationale":"Tier 3 — genotype-phenotype correlation without in vitro mechanistic assay; single family study","pmids":["8499568"],"is_preprint":false},{"year":1991,"finding":"Aerobic exercise activates the PROC/PAR1/Nrf2/HO-1 signaling pathway in a rat model of diabetic cardiomyopathy, where protein C (encoded by PROC) was reduced in DCM hearts and restored by exercise; Western blotting confirmed pathway activation, suggesting protein C signals through PAR1 to activate Nrf2/HO-1 antioxidant defense.","method":"Rat diabetic cardiomyopathy model; Western blotting for pathway components; bioinformatics gene expression analysis","journal":"Frontiers in physiology","confidence":"Low","confidence_rationale":"Tier 3 — pathway inference from animal model with Western blot; no direct mechanistic reconstitution of PROC/PAR1 interaction","pmids":["41695095"],"is_preprint":false}],"current_model":"Human PROC encodes protein C, a vitamin K-dependent serine protease zymogen and anticoagulant; missense and other mutations cause protein C deficiency by impairing secretion (intracellular retention), reducing catalytic activity (increased Km, decreased Vmax), or disrupting splicing (exon skipping, cryptic splice-site activation, pseudo-exon inclusion), with promoter and intronic regulatory elements (including an HNF-1-responsive enhancer in intron 1) controlling hepatic transcription, and the activated form (APC) inactivates coagulation factors Va and VIIIa to suppress thrombin generation."},"narrative":{"teleology":[{"year":1993,"claim":"The question of which protein C domains are essential for anticoagulant function was addressed by identifying a Gla domain missense mutation (Arg15Trp) that dissociates antigen levels from anticoagulant activity, implicating the Gla domain pentapeptide in calcium-dependent membrane binding required for function.","evidence":"DNA sequencing and family co-segregation analysis in a protein C-deficient kindred","pmids":["8499568"],"confidence":"Low","gaps":["No in vitro functional assay to confirm membrane-binding defect","Single family study without independent replication","No direct calcium-binding or phospholipid-binding measurement"]},{"year":1995,"claim":"How promoter sequence variation controls PROC expression was unknown; linked diallelic promoter polymorphisms were shown to cause a ≥2-fold difference in transcriptional output in hepatoma cells, establishing that common promoter haplotypes are a determinant of protein C plasma levels.","evidence":"Transient transfection of PROC promoter-luciferase reporters in HepG2 cells","pmids":["7548679"],"confidence":"Medium","gaps":["Relevant transcription factors binding differentially to haplotypes not identified","In vivo relevance in human liver not confirmed","Effect size in plasma protein C levels not quantified in population studies"]},{"year":1996,"claim":"It was unclear how premature termination codon mutations in PROC affect mRNA abundance; RT-PCR of patient lymphocytes demonstrated allelic exclusion (nonsense-mediated decay) of mutant PROC transcripts for most null alleles, while a 2-bp insertion instead activated a cryptic splice site generating aberrant mRNA, revealing two distinct mRNA-level pathogenic mechanisms.","evidence":"RT-PCR and direct sequencing of ectopic PROC transcripts from patient lymphocytes with polymorphism-based allele discrimination","pmids":["8822578"],"confidence":"Medium","gaps":["NMD pathway components responsible not identified","Analysis performed on ectopic (lymphocyte) transcripts rather than hepatic mRNA","Quantitative contribution of NMD vs. residual mutant transcript not measured"]},{"year":2000,"claim":"Regulatory elements beyond the core promoter were uncharacterized; an intronic enhancer in intron 1 (142 bp essential region) was identified that boosts hepatic promoter activity, and HNF-1 was shown to repress rather than activate transcription when this element is present, revising the expected role of HNF-1 at the PROC locus.","evidence":"Deletion mapping of PROC promoter-luciferase reporters in human hepatoma cells with HNF-1 perturbation","pmids":["11140943"],"confidence":"Medium","gaps":["HNF-1 repressive mechanism (direct binding vs. indirect) not resolved","In vivo chromatin context not assessed","Other transcription factors acting on the intronic enhancer not identified"]},{"year":2002,"claim":"The molecular basis of type I protein C deficiency from missense mutations was unclear; expression of the D180G protease-domain variant revealed a 79% secretion deficit with normal intracellular protein, establishing misfolding-driven intracellular retention as a primary pathogenic mechanism.","evidence":"Transient expression of PROC mutant in HK-293 cells with ELISA quantification of secreted vs. intracellular protein; structural modelling on the APC crystal structure","pmids":["12362235"],"confidence":"Medium","gaps":["Degradation pathway (proteasomal vs. lysosomal) not determined","ER chaperone interactions not characterized","Rescue by chemical chaperones not tested"]},{"year":2012,"claim":"Whether in-frame deletions could selectively impair anticoagulant activity while sparing catalytic function was tested; the c.574_576del variant retained near-normal amidolytic activity but only 43.6% anticoagulant activity, demonstrating a dissociation between substrate hydrolysis and macromolecular substrate (FVa/FVIIIa) recognition.","evidence":"In vitro expression with both amidolytic (chromogenic) and anticoagulant (clotting-based) functional assays","pmids":["22817391"],"confidence":"Medium","gaps":["Binding affinity for factor Va or VIIIa not directly measured","Structural basis for selective loss of anticoagulant activity not resolved","Thrombomodulin-dependent activation kinetics not assessed"]},{"year":2022,"claim":"Building on earlier secretion-defect findings, the Gly86Asp variant confirmed that type I deficiency can arise from impaired secretion without altered transcription, with multiple orthogonal methods (qRT-PCR, ELISA, Western blot) distinguishing transcriptional from post-translational mechanisms.","evidence":"qRT-PCR, ELISA of supernatant and lysate, Western blot in HEK 293FT cells","pmids":["35810421"],"confidence":"Medium","gaps":["Glycosylation status and folding intermediates not examined","Single cell line used","Endogenous hepatocyte expression not studied"]},{"year":2024,"claim":"The question of how missense mutations affect enzyme kinetics was quantitatively addressed; N355S, G392E, and T314A variants showed increased Km and decreased Vmax, directly demonstrating impaired substrate binding and catalysis as mechanisms of type II deficiency, with T314A additionally reducing secretion.","evidence":"Enzyme kinetics assays (Km/Vmax determination), ELISA, Western blot, and PyMOL structural modelling in HEK293 cells","pmids":["39743273"],"confidence":"Medium","gaps":["Natural substrates (FVa, FVIIIa) not used as kinetic substrates","No thrombin generation or coagulation-based functional validation","Structural predictions not validated by experimental structure determination"]},{"year":2025,"claim":"Deep intronic variants had been largely uncharacterized; four deep intronic substitutions were shown by minigene assays to cause pathogenic splicing defects (intron retention, pseudo-exon activation), expanding the mutational spectrum of PROC deficiency beyond coding and canonical splice sites.","evidence":"Whole PROC gene NGS; minigene splicing assays in HeLa and Huh7 cells; SpliceAI and MaxEntScan in silico prediction","pmids":["40789311"],"confidence":"High","gaps":["Endogenous hepatocyte splicing patterns not confirmed","Quantitative contribution of aberrant isoforms to plasma protein C levels unknown","NMD susceptibility of aberrant transcripts not directly tested"]},{"year":2026,"claim":"Whether splice-site mutations in PROC could be therapeutically corrected at the RNA level was unknown; engineered U1 and U7 snRNAs partially rescued normal splicing for multiple splice-site variants in minigene assays, establishing proof-of-concept for splice-directed RNA therapy of protein C deficiency.","evidence":"Minigene splicing assays with U1/U7 snRNA co-transfection in HeLa and Huh7 cells; protein expression and activity validation","pmids":["41791661"],"confidence":"High","gaps":["In vivo delivery and efficacy not demonstrated","Rescue was partial; degree of clinical benefit unpredictable","Off-target splicing effects of engineered snRNAs not assessed"]},{"year":2026,"claim":"The functional consequence of protein C deficiency on thrombin generation in hemophilia A was quantitatively established; reduced protein C concentration increased thrombin generation in FVIII-deficient plasma upon thrombomodulin addition, demonstrating that PC deficiency can attenuate bleeding phenotype by improving thrombin generation.","evidence":"Recombinant PROC expression in Expi293F cells; chromogenic activity assay; thrombin generation assay in FVIII-deficient plasma with varying PC concentrations","pmids":["41791668"],"confidence":"Medium","gaps":["In vivo confirmation of bleeding attenuation in hemophilia A patients with PC deficiency not established","Dose-response relationship between PC levels and clinical phenotype not defined","Interaction with other natural anticoagulants (protein S, antithrombin) not assessed"]},{"year":null,"claim":"Key unresolved questions include the structural basis for selective anticoagulant vs. amidolytic defects, the ER quality-control pathway responsible for retention/degradation of misfolded protein C variants, and whether splice-directed RNA therapeutics can restore clinically meaningful protein C levels in vivo.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structures of disease-causing mutant protein C forms","ER chaperone and degradation pathway specificity unknown","In vivo efficacy of U1/U7 snRNA splice correction not tested","Contribution of deep intronic variants to unexplained protein C deficiency in clinical cohorts not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,8,9]}],"localization":[{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[4,5,6,7,9]}],"pathway":[{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[0,8,9]}],"complexes":[],"partners":[],"other_free_text":[]},"mechanistic_narrative":"PROC encodes protein C, a vitamin K-dependent serine protease zymogen that functions as a critical anticoagulant by inactivating coagulation factors Va and VIIIa, thereby suppressing thrombin generation. Hepatic transcription of PROC is governed by promoter polymorphisms that modulate expression levels and by an intron 1 enhancer element where the transcription factor HNF-1 exerts a repressive effect [PMID:7548679, PMID:11140943]. Missense mutations in the protease domain cause protein C deficiency through two principal mechanisms: impaired secretion due to intracellular retention of misfolded protein (type I deficiency) and reduced catalytic efficiency with increased Km and decreased Vmax (type II deficiency) [PMID:12362235, PMID:39743273, PMID:22817391]. Splice-site and deep intronic mutations produce aberrant mRNA isoforms—including exon skipping, intron retention, and pseudo-exon inclusion—that are subject to nonsense-mediated mRNA decay or encode nonfunctional protein, and these defects can be partially rescued by engineered U1/U7 snRNAs [PMID:8822578, PMID:40789311, PMID:41791661]."},"prefetch_data":{"uniprot":{"accession":"P04070","full_name":"Vitamin K-dependent protein C","aliases":["Anticoagulant protein C","Autoprothrombin IIA","Blood coagulation factor XIV"],"length_aa":461,"mass_kda":52.1,"function":"Protein C is a vitamin K-dependent serine protease that regulates blood coagulation by inactivating factors Va and VIIIa in the presence of calcium ions and phospholipids (PubMed:25618265, PubMed:39880037). Exerts a protective effect on the endothelial cell barrier function (PubMed:25651845)","subcellular_location":"Secreted; Golgi apparatus; Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/P04070/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PROC","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/PROC","total_profiled":1310},"omim":[{"mim_id":"616214","title":"HYPERPROINSULINEMIA","url":"https://www.omim.org/entry/616214"},{"mim_id":"614507","title":"CONGENITAL DISORDER OF GLYCOSYLATION, TYPE Ir; CDG1R","url":"https://www.omim.org/entry/614507"},{"mim_id":"613878","title":"COAGULATION FACTOR VII; F7","url":"https://www.omim.org/entry/613878"},{"mim_id":"613872","title":"COAGULATION FACTOR X; F10","url":"https://www.omim.org/entry/613872"},{"mim_id":"612309","title":"COAGULATION FACTOR V; F5","url":"https://www.omim.org/entry/612309"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"liver","ntpm":584.1}],"url":"https://www.proteinatlas.org/search/PROC"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P04070","domains":[{"cath_id":"2.10.25.10","chopping":"137-180","consensus_level":"medium","plddt":94.2139,"start":137,"end":180},{"cath_id":"2.40.10.10","chopping":"222-306","consensus_level":"medium","plddt":93.5454,"start":222,"end":306},{"cath_id":"2.40.10.10","chopping":"324-446","consensus_level":"medium","plddt":85.3791,"start":324,"end":446}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P04070","model_url":"https://alphafold.ebi.ac.uk/files/AF-P04070-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P04070-F1-predicted_aligned_error_v6.png","plddt_mean":82.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PROC","jax_strain_url":"https://www.jax.org/strain/search?query=PROC"},"sequence":{"accession":"P04070","fasta_url":"https://rest.uniprot.org/uniprotkb/P04070.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P04070/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P04070"}},"corpus_meta":[{"pmid":"22817391","id":"PMC_22817391","title":"PROC c.574_576del polymorphism: a common genetic risk factor for venous thrombosis in the Chinese population.","date":"2012","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/22817391","citation_count":53,"is_preprint":false},{"pmid":"6260750","id":"PMC_6260750","title":"Use of bacteriophage transposon Mu d1 to determine the orientation for three proC-linked phosphate-starvation-inducible (psi) genes in Escherichia coli K-12.","date":"1981","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/6260750","citation_count":52,"is_preprint":false},{"pmid":"18680534","id":"PMC_18680534","title":"PROC, PROCR and PROS1 polymorphisms, plasma anticoagulant phenotypes, and risk of cardiovascular disease and mortality in older adults: the Cardiovascular Health Study.","date":"2008","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/18680534","citation_count":49,"is_preprint":false},{"pmid":"9299966","id":"PMC_9299966","title":"ProC Global: the first functional screening assay for the complete protein C pathway.","date":"1997","source":"Clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9299966","citation_count":47,"is_preprint":false},{"pmid":"11537868","id":"PMC_11537868","title":"Molecular cloning and evidence for osmoregulation of the delta 1-pyrroline-5-carboxylate reductase (proC) gene in pea (Pisum sativum L.).","date":"1992","source":"Plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/11537868","citation_count":29,"is_preprint":false},{"pmid":"10937806","id":"PMC_10937806","title":"Screening for abnormalities of the protein C anticoagulant pathway using the ProC Global assay. Results of a European multicenter evaluation.","date":"2000","source":"Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis","url":"https://pubmed.ncbi.nlm.nih.gov/10937806","citation_count":28,"is_preprint":false},{"pmid":"2107123","id":"PMC_2107123","title":"Comparison of proC and other housekeeping genes of Pseudomonas aeruginosa with their counterparts in Escherichia coli.","date":"1990","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/2107123","citation_count":28,"is_preprint":false},{"pmid":"15114590","id":"PMC_15114590","title":"R147W mutation of PROC gene is common in venous thrombotic patients in Taiwanese Chinese.","date":"2004","source":"American journal of hematology","url":"https://pubmed.ncbi.nlm.nih.gov/15114590","citation_count":27,"is_preprint":false},{"pmid":"3356168","id":"PMC_3356168","title":"Assignment of the human protein C gene (PROC) to chromosome region 2q14----q21 by in situ hybridization.","date":"1988","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/3356168","citation_count":26,"is_preprint":false},{"pmid":"2188947","id":"PMC_2188947","title":"Complementation of an Escherichia coli proC mutation by a gene cloned from Treponema pallidum.","date":"1990","source":"Journal of bacteriology","url":"https://pubmed.ncbi.nlm.nih.gov/2188947","citation_count":25,"is_preprint":false},{"pmid":"1511988","id":"PMC_1511988","title":"A novel homozygous missense mutation in the protein C (PROC) gene causing recurrent venous thrombosis.","date":"1992","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/1511988","citation_count":25,"is_preprint":false},{"pmid":"15801769","id":"PMC_15801769","title":"Auxotrophic markers pyrF and proC can replace antibiotic markers on protein production plasmids in high-cell-density Pseudomonas fluorescens fermentation.","date":"2005","source":"Biotechnology progress","url":"https://pubmed.ncbi.nlm.nih.gov/15801769","citation_count":23,"is_preprint":false},{"pmid":"7841323","id":"PMC_7841323","title":"A homozygous deletion/insertion mutation in the protein C (PROC) gene causing neonatal Purpura fulminans: prenatal diagnosis in an at-risk pregnancy.","date":"1994","source":"Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis","url":"https://pubmed.ncbi.nlm.nih.gov/7841323","citation_count":23,"is_preprint":false},{"pmid":"9330432","id":"PMC_9330432","title":"Evaluation of a new screening assay ProC Global for identification of defects in the protein C/protein S anticoagulant pathway.","date":"1997","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/9330432","citation_count":22,"is_preprint":false},{"pmid":"8123043","id":"PMC_8123043","title":"Molecular cloning and sequence analysis of the proC gene encoding delta 1-pyrroline-5-carboxylate reductase from an extremely thermophilic eubacterium Thermus thermophilus.","date":"1994","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/8123043","citation_count":21,"is_preprint":false},{"pmid":"11140943","id":"PMC_11140943","title":"Identification of an intronic regulatory element in the human protein C (PROC) gene.","date":"2000","source":"Human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11140943","citation_count":20,"is_preprint":false},{"pmid":"10220161","id":"PMC_10220161","title":"Proline biosynthesis from L-ornithine in Clostridium sticklandii: purification of delta1-pyrroline-5-carboxylate reductase, and sequence and expression of the encoding gene, proC.","date":"1999","source":"Microbiology (Reading, England)","url":"https://pubmed.ncbi.nlm.nih.gov/10220161","citation_count":19,"is_preprint":false},{"pmid":"15735816","id":"PMC_15735816","title":"\"ProC Global\": a functional screening test that predicts recurrent venous thromboembolism.","date":"2005","source":"Thrombosis and haemostasis","url":"https://pubmed.ncbi.nlm.nih.gov/15735816","citation_count":17,"is_preprint":false},{"pmid":"32964666","id":"PMC_32964666","title":"Recurrent PROC and novel PROS1 mutations in Vietnamese patients diagnosed with idiopathic deep venous thrombosis.","date":"2020","source":"International journal of laboratory hematology","url":"https://pubmed.ncbi.nlm.nih.gov/32964666","citation_count":15,"is_preprint":false},{"pmid":"11672753","id":"PMC_11672753","title":"Sensitivity of the ProC global assay for protein C pathway abnormalities. clinical experience in 899 unselected patients with venous thromboembolism.","date":"2001","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/11672753","citation_count":15,"is_preprint":false},{"pmid":"28511552","id":"PMC_28511552","title":"R147W in PROC Gene Is a Risk Factor of Thromboembolism in Thai Children.","date":"2017","source":"Clinical and applied 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in-frame deletion variant produces a protein C with markedly reduced anticoagulant activity (43.6% of wild-type) while retaining near-normal amidolytic activity, demonstrating a type II (functional) defect. In vitro expression studies established that the anticoagulant defect is intrinsic to the mutant protein.\",\n      \"method\": \"In vitro expression in cell lines, functional amidolytic and anticoagulant activity assays\",\n      \"journal\": \"Journal of thrombosis and haemostasis : JTH\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — direct in vitro functional assay with defined activity readout; single lab, single study\",\n      \"pmids\": [\"22817391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"An intronic regulatory element located >500 bp downstream of the core promoter within intron 1 of the human PROC gene enhances promoter-driven expression in human hepatoma cells. A 142 bp sequence within this element is required for high-level expression; a duplicate copy of this element is also present upstream. Transcription factor HNF-1 represses (rather than activates) the promoter when coupled to the intronic sequence.\",\n      \"method\": \"Transient transfection of PROC promoter-luciferase reporter constructs in human hepatoma cells; conventional alignment and complexity analysis to identify conserved regions\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay with deletion mapping and transcription factor perturbation; single lab, moderate evidence\",\n      \"pmids\": [\"11140943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Polymorphic haplotypes in the human PROC gene promoter (T/A vs C/G at two linked diallelic sites) differentially drive transcription: the T/A haplotype exhibits at least 2-fold higher transcription efficiency than the C/G haplotype in HepG2 hepatoma cells.\",\n      \"method\": \"Transient transfection of PROC promoter-luciferase reporter constructs in HepG2 cells\",\n      \"journal\": \"Blood coagulation & fibrinolysis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reporter assay directly measuring promoter activity; single lab, single method\",\n      \"pmids\": [\"7548679\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Nonsense mutations, frameshift deletions, and splice-site mutations in the PROC gene are frequently subject to allelic exclusion at the mRNA level (NMD-like mechanism), with only normal-allele-derived mRNA detected by RT-PCR/sequencing; one 2-bp insertion instead generated a cryptic splice site producing an aberrant mRNA with a premature stop codon rather than allelic exclusion.\",\n      \"method\": \"RT-PCR and direct sequencing of ectopic PROC transcripts from patient lymphocytes; polymorphism analysis to confirm allele-specific exclusion\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mRNA analysis with allele-specific confirmation in multiple patients; single lab\",\n      \"pmids\": [\"8822578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The D180G missense mutation in the protease domain of protein C causes a severe reduction in secretion (79% decrease vs wild-type) without altering intracellular protein content, consistent with protein misfolding and intracellular retention/degradation. Structural modelling of the X-ray structure of activated protein C predicted local destabilisation by the mutation.\",\n      \"method\": \"Transient expression of PROC mutant in HK-293 cells with ELISA of culture media and cell lysates; computational structural analysis using X-ray structure of activated protein C\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro expression with secretion assay plus structural modelling; single lab, moderate\",\n      \"pmids\": [\"12362235\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The PROC p.Ala178Pro missense variant causes type I protein C deficiency by reducing secretion of the protein C antigen from cells, as demonstrated by in vitro cell studies showing consistently reduced PROC antigen concentration in media from mutant-transfected cells relative to controls.\",\n      \"method\": \"In vitro cell line expression with PROC antigen measurement in conditioned media; clinical plasma protein C activity measurement in variant carriers\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro secretion assay supported by clinical phenotype data; single lab\",\n      \"pmids\": [\"31338992\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The PROC p.Gly334Ser missense variant significantly decreases protein C secretion into culture media from HEK293T cells (but not from Huh-7 cells), without reducing intracellular protein C levels, indicating impaired secretion as the pathogenic mechanism. Western blot confirmed expression levels in cell lysates were not significantly altered.\",\n      \"method\": \"Transfection of PROC expression vectors into Huh-7 and HEK293T cells; Western blot of cell lysates and conditioned media\",\n      \"journal\": \"American heart journal plus : cardiology research and practice\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro secretion assay with two cell lines; single lab\",\n      \"pmids\": [\"40008275\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The PROC p.Gly86Asp variant impairs secretion of protein C without altering mRNA transcription levels: mutant PC antigen was 81.3% of wild-type in culture supernatant but 110% in cell lysate, indicating intracellular retention as the molecular mechanism of type I PC deficiency.\",\n      \"method\": \"qRT-PCR for mRNA level; ELISA for PC antigen in supernatant and lysate; Western blot for protein level in HEK 293FT cells transfected with wild-type or mutant PROC\",\n      \"journal\": \"Zhonghua yi xue yi chuan xue za zhi\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (qRT-PCR, ELISA, Western blot) in single lab\",\n      \"pmids\": [\"35810421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PROC missense mutations N355S, G392E, and T314A cause functional defects in protein C by reducing substrate binding affinity (increased Km) and catalytic rate (decreased Vmax) in enzyme kinetics assays; T314A additionally reduces secretion. Structural modelling showed spatial collisions introduced by substitutions distort the active site region.\",\n      \"method\": \"Transient transfection of HEK293 cells; real-time PCR for mRNA; ELISA and Western blot for protein levels; enzyme kinetics (Km, Vmax) assay; PyMOL structural modelling\",\n      \"journal\": \"Zhongguo shi yan xue ye xue za zhi\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro enzyme kinetics plus secretion assay plus structural modelling; single lab\",\n      \"pmids\": [\"39743273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The PROC p.Trp414Arg variant causes near-complete loss of protein C activity (0% vs 90% for wild-type) and nearly absent secretion (4% vs 100%) when expressed in Expi293F cells, confirming a quantitative (type I) protein C deficiency. Thrombin generation assays in FVIII-deficient plasma showed that reduced protein C concentrations increase thrombin generation upon thrombomodulin addition, demonstrating that PC deficiency attenuates bleeding in hemophilia A by improving thrombin generation.\",\n      \"method\": \"Recombinant protein production in Expi293F cells; chromogenic activity assay; competitive ELISA for protein quantity; thrombin generation assays in factor VIII-deficient plasma with varying PC concentrations; AlphaFold 3 structural prediction\",\n      \"journal\": \"Journal of thrombosis and haemostasis : JTH\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution with functional activity assay and thrombin generation; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"41791668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Multiple PROC variants at exon-intron boundaries induce complex splicing defects (exon skipping, cryptic donor site activation, multiple aberrant isoforms). Engineered U1 and U7 snRNAs partially restore normal splicing in affected variants, demonstrating feasibility of splice-directed RNA therapeutic correction of PROC splice-site mutations.\",\n      \"method\": \"Minigene splicing assays in HeLa and Huh7 cells; engineered U1/U7 snRNA rescue experiments; in silico splice prediction (SpliceAI and four other tools); protein expression, secretion, and activity analyses\",\n      \"journal\": \"Journal of thrombosis and haemostasis : JTH\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — minigene splicing assays with snRNA rescue in two cell lines plus protein-level validation; multiple orthogonal methods in single study\",\n      \"pmids\": [\"41791661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Deep intronic PROC substitutions (c.237+75G>A, c.535+936C>T, c.536-95G>A, c.796+49G>T) cause pathogenic splicing defects including intron retention in mature mRNA or pseudo-exon activation, identified by in vitro splicing assays in HeLa and Huh7 cells; a 541 bp deletion and a 1.298 kb balanced inversion also disrupt the PROC gene and are classified as pathogenic.\",\n      \"method\": \"Whole PROC gene NGS; in vitro minigene splicing assay in HeLa and Huh7 cells; in silico analysis (MaxEntScan and SpliceAI)\",\n      \"journal\": \"Thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro splicing functional assay in two cell lines, validated in multiple patients; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"40789311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"A Gla domain missense mutation Arg15→Trp (CGG→TGG) in the PROC gene causes type II protein C deficiency (reduced anticoagulant function with preserved antigen), implicating the conserved pentapeptide in the Gla domain in functional calcium-dependent membrane binding of protein C.\",\n      \"method\": \"DNA sequencing; family co-segregation analysis; phenotypic classification (antigen vs. functional activity)\",\n      \"journal\": \"Blood coagulation & fibrinolysis\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — genotype-phenotype correlation without in vitro mechanistic assay; single family study\",\n      \"pmids\": [\"8499568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"Aerobic exercise activates the PROC/PAR1/Nrf2/HO-1 signaling pathway in a rat model of diabetic cardiomyopathy, where protein C (encoded by PROC) was reduced in DCM hearts and restored by exercise; Western blotting confirmed pathway activation, suggesting protein C signals through PAR1 to activate Nrf2/HO-1 antioxidant defense.\",\n      \"method\": \"Rat diabetic cardiomyopathy model; Western blotting for pathway components; bioinformatics gene expression analysis\",\n      \"journal\": \"Frontiers in physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — pathway inference from animal model with Western blot; no direct mechanistic reconstitution of PROC/PAR1 interaction\",\n      \"pmids\": [\"41695095\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Human PROC encodes protein C, a vitamin K-dependent serine protease zymogen and anticoagulant; missense and other mutations cause protein C deficiency by impairing secretion (intracellular retention), reducing catalytic activity (increased Km, decreased Vmax), or disrupting splicing (exon skipping, cryptic splice-site activation, pseudo-exon inclusion), with promoter and intronic regulatory elements (including an HNF-1-responsive enhancer in intron 1) controlling hepatic transcription, and the activated form (APC) inactivates coagulation factors Va and VIIIa to suppress thrombin generation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PROC encodes protein C, a vitamin K-dependent serine protease zymogen that functions as a critical anticoagulant by inactivating coagulation factors Va and VIIIa, thereby suppressing thrombin generation. Hepatic transcription of PROC is governed by promoter polymorphisms that modulate expression levels and by an intron 1 enhancer element where the transcription factor HNF-1 exerts a repressive effect [PMID:7548679, PMID:11140943]. Missense mutations in the protease domain cause protein C deficiency through two principal mechanisms: impaired secretion due to intracellular retention of misfolded protein (type I deficiency) and reduced catalytic efficiency with increased Km and decreased Vmax (type II deficiency) [PMID:12362235, PMID:39743273, PMID:22817391]. Splice-site and deep intronic mutations produce aberrant mRNA isoforms—including exon skipping, intron retention, and pseudo-exon inclusion—that are subject to nonsense-mediated mRNA decay or encode nonfunctional protein, and these defects can be partially rescued by engineered U1/U7 snRNAs [PMID:8822578, PMID:40789311, PMID:41791661].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"The question of which protein C domains are essential for anticoagulant function was addressed by identifying a Gla domain missense mutation (Arg15Trp) that dissociates antigen levels from anticoagulant activity, implicating the Gla domain pentapeptide in calcium-dependent membrane binding required for function.\",\n      \"evidence\": \"DNA sequencing and family co-segregation analysis in a protein C-deficient kindred\",\n      \"pmids\": [\"8499568\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No in vitro functional assay to confirm membrane-binding defect\", \"Single family study without independent replication\", \"No direct calcium-binding or phospholipid-binding measurement\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"How promoter sequence variation controls PROC expression was unknown; linked diallelic promoter polymorphisms were shown to cause a ≥2-fold difference in transcriptional output in hepatoma cells, establishing that common promoter haplotypes are a determinant of protein C plasma levels.\",\n      \"evidence\": \"Transient transfection of PROC promoter-luciferase reporters in HepG2 cells\",\n      \"pmids\": [\"7548679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relevant transcription factors binding differentially to haplotypes not identified\", \"In vivo relevance in human liver not confirmed\", \"Effect size in plasma protein C levels not quantified in population studies\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"It was unclear how premature termination codon mutations in PROC affect mRNA abundance; RT-PCR of patient lymphocytes demonstrated allelic exclusion (nonsense-mediated decay) of mutant PROC transcripts for most null alleles, while a 2-bp insertion instead activated a cryptic splice site generating aberrant mRNA, revealing two distinct mRNA-level pathogenic mechanisms.\",\n      \"evidence\": \"RT-PCR and direct sequencing of ectopic PROC transcripts from patient lymphocytes with polymorphism-based allele discrimination\",\n      \"pmids\": [\"8822578\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NMD pathway components responsible not identified\", \"Analysis performed on ectopic (lymphocyte) transcripts rather than hepatic mRNA\", \"Quantitative contribution of NMD vs. residual mutant transcript not measured\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Regulatory elements beyond the core promoter were uncharacterized; an intronic enhancer in intron 1 (142 bp essential region) was identified that boosts hepatic promoter activity, and HNF-1 was shown to repress rather than activate transcription when this element is present, revising the expected role of HNF-1 at the PROC locus.\",\n      \"evidence\": \"Deletion mapping of PROC promoter-luciferase reporters in human hepatoma cells with HNF-1 perturbation\",\n      \"pmids\": [\"11140943\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"HNF-1 repressive mechanism (direct binding vs. indirect) not resolved\", \"In vivo chromatin context not assessed\", \"Other transcription factors acting on the intronic enhancer not identified\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The molecular basis of type I protein C deficiency from missense mutations was unclear; expression of the D180G protease-domain variant revealed a 79% secretion deficit with normal intracellular protein, establishing misfolding-driven intracellular retention as a primary pathogenic mechanism.\",\n      \"evidence\": \"Transient expression of PROC mutant in HK-293 cells with ELISA quantification of secreted vs. intracellular protein; structural modelling on the APC crystal structure\",\n      \"pmids\": [\"12362235\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Degradation pathway (proteasomal vs. lysosomal) not determined\", \"ER chaperone interactions not characterized\", \"Rescue by chemical chaperones not tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Whether in-frame deletions could selectively impair anticoagulant activity while sparing catalytic function was tested; the c.574_576del variant retained near-normal amidolytic activity but only 43.6% anticoagulant activity, demonstrating a dissociation between substrate hydrolysis and macromolecular substrate (FVa/FVIIIa) recognition.\",\n      \"evidence\": \"In vitro expression with both amidolytic (chromogenic) and anticoagulant (clotting-based) functional assays\",\n      \"pmids\": [\"22817391\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding affinity for factor Va or VIIIa not directly measured\", \"Structural basis for selective loss of anticoagulant activity not resolved\", \"Thrombomodulin-dependent activation kinetics not assessed\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Building on earlier secretion-defect findings, the Gly86Asp variant confirmed that type I deficiency can arise from impaired secretion without altered transcription, with multiple orthogonal methods (qRT-PCR, ELISA, Western blot) distinguishing transcriptional from post-translational mechanisms.\",\n      \"evidence\": \"qRT-PCR, ELISA of supernatant and lysate, Western blot in HEK 293FT cells\",\n      \"pmids\": [\"35810421\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Glycosylation status and folding intermediates not examined\", \"Single cell line used\", \"Endogenous hepatocyte expression not studied\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The question of how missense mutations affect enzyme kinetics was quantitatively addressed; N355S, G392E, and T314A variants showed increased Km and decreased Vmax, directly demonstrating impaired substrate binding and catalysis as mechanisms of type II deficiency, with T314A additionally reducing secretion.\",\n      \"evidence\": \"Enzyme kinetics assays (Km/Vmax determination), ELISA, Western blot, and PyMOL structural modelling in HEK293 cells\",\n      \"pmids\": [\"39743273\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Natural substrates (FVa, FVIIIa) not used as kinetic substrates\", \"No thrombin generation or coagulation-based functional validation\", \"Structural predictions not validated by experimental structure determination\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Deep intronic variants had been largely uncharacterized; four deep intronic substitutions were shown by minigene assays to cause pathogenic splicing defects (intron retention, pseudo-exon activation), expanding the mutational spectrum of PROC deficiency beyond coding and canonical splice sites.\",\n      \"evidence\": \"Whole PROC gene NGS; minigene splicing assays in HeLa and Huh7 cells; SpliceAI and MaxEntScan in silico prediction\",\n      \"pmids\": [\"40789311\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous hepatocyte splicing patterns not confirmed\", \"Quantitative contribution of aberrant isoforms to plasma protein C levels unknown\", \"NMD susceptibility of aberrant transcripts not directly tested\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Whether splice-site mutations in PROC could be therapeutically corrected at the RNA level was unknown; engineered U1 and U7 snRNAs partially rescued normal splicing for multiple splice-site variants in minigene assays, establishing proof-of-concept for splice-directed RNA therapy of protein C deficiency.\",\n      \"evidence\": \"Minigene splicing assays with U1/U7 snRNA co-transfection in HeLa and Huh7 cells; protein expression and activity validation\",\n      \"pmids\": [\"41791661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo delivery and efficacy not demonstrated\", \"Rescue was partial; degree of clinical benefit unpredictable\", \"Off-target splicing effects of engineered snRNAs not assessed\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"The functional consequence of protein C deficiency on thrombin generation in hemophilia A was quantitatively established; reduced protein C concentration increased thrombin generation in FVIII-deficient plasma upon thrombomodulin addition, demonstrating that PC deficiency can attenuate bleeding phenotype by improving thrombin generation.\",\n      \"evidence\": \"Recombinant PROC expression in Expi293F cells; chromogenic activity assay; thrombin generation assay in FVIII-deficient plasma with varying PC concentrations\",\n      \"pmids\": [\"41791668\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo confirmation of bleeding attenuation in hemophilia A patients with PC deficiency not established\", \"Dose-response relationship between PC levels and clinical phenotype not defined\", \"Interaction with other natural anticoagulants (protein S, antithrombin) not assessed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for selective anticoagulant vs. amidolytic defects, the ER quality-control pathway responsible for retention/degradation of misfolded protein C variants, and whether splice-directed RNA therapeutics can restore clinically meaningful protein C levels in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structures of disease-causing mutant protein C forms\", \"ER chaperone and degradation pathway specificity unknown\", \"In vivo efficacy of U1/U7 snRNA splice correction not tested\", \"Contribution of deep intronic variants to unexplained protein C deficiency in clinical cohorts not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 8, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [4, 5, 6, 7, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [0, 8, 9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```"}