{ "@context": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/context/doc", "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114", "id": "CG-AC:AC114", "type": "ClinicalActionabilityReport", "metadata": { "schemaLabel": "AC-Sepio.Beta-1 (Unofficial)", "contentVersionId": "29618", "producedAtUTC": "Thu, 10 Sep 2026 19:39:06 -0000", "note": "DISCLAIMER: The SEPIO-inspired schema presented here is an initial prototype for Clinical Actionability curation summaries and has not been reviewed nor finalized by the ClinGen Data Exchange Modeling Team. We expect it to differ significantly from the final schema." }, "description": "JSON-LD representation of ClinGen Actionability Stage 2 report modeled with SEPIO. The hierarchically structured document will include:\n1. Contextual & topic information, such as the **conditions/diseases** and the **genes**.\n2. Categorized **evidence narratives**, with references.\n\t* This content corresponds to the texts within the *Actionability Summary Report*\n4. **Outcome & Intervention** pairs, with **consensus scoring** in 5 dimensions:\n\t1. Outcome Severity\n\t2. Outcome Likelihood\n\t3. Intervention Effectiveness\n\t4. Nature of the Intervention\n\t5. Total (Overall) Score\n\n*( Note: The summary report does not include the **Screening Survey** which led to preparation of the actionability report. )", "condition": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/co", "id": "CG-AC:AC114/co", "type": "GeneticCondition", "label": "Hemochromatosis, Type 1", "description": "Clinical HFE-HH is characterized by excessive storage of iron in the liver, skin, pancreas, heart, joints, and testes." }, "outcome": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ou/Clinically%20apparent%20disease", "id": "CG-AC:AC114/ou/Clinically apparent disease", "type": "Outcome", "label": "Clinically apparent disease" } ], "intervention": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/intv/Monitoring%20of%20ferritin%20levels", "id": "CG-AC:AC114/intv/Monitoring of ferritin levels", "type": "Intervention", "label": "Monitoring of ferritin levels" }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/intv/Phlebotomy", "id": "CG-AC:AC114/intv/Phlebotomy", "type": "Intervention", "label": "Phlebotomy" } ], "clinicalActionabilityProfile": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/cap", "id": "CG-AC:AC114/cap", "type": "Assertion", "assertionMethod": "The ClinGen AWG developed a standardized protocol to generate evidence-based profiles of clinical actionability of genes and associated disorders in the form of summary reports and semiquantitative metric (SQM) scores.", "releaseDate": "Wed, 28 Jun 2023 00:00:00 -0000", "releaseNum": "0.0.1" }, "evidenceStatements": { "evidenceNarratives": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/en/ACMI2794", "id": "CG-AC:AC114/en/ACMI2794", "type": "EvidenceNarrative", "narrative": "Autosomal Recessive", "evidenceDomainTag": "Threat Materialization Chances.Modes of Inheritance" }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/en/potgd", "id": "CG-AC:AC114/en/potgd", "type": "EvidenceNarrative", "narrative": "Hereditary hemochromatosis (HHC) is a common genetic disorder that can lead to iron overload. Estimates of prevalence in the general population vary due to a long pre-clinical period and lack of consistent definitions of \"case.\" The prevalence of hemochromatosis cases defined biochemically (elevated serum iron) will be higher than prevalence of cases based on documented iron overload, with or without clinical signs and symptoms. The prevalence will be lower for cases based on diagnosed disease (cirrhosis, diabetes).\\n\\n\\nIn North America, an estimated 80% of clinically recognized cases are due to homozygosity of the HFE C282Y polymorphism, and an additional 4% are due to compound heterozygosity of the C282Y and H63D polymorphisms. In Caucasians, the prevalence of HFE-associated HHC (HFE-HHC) has been estimated as 1/220-1/250. However, the prevalence of HFE-HHC with clinical manifestations is much lower, estimated as 1/2500.", "evidenceDomainTag": "Nature of the Threat.Prevalence of the Genetic Disorder", "publication": [ "CG-AC:RF000471", "CG-AC:RF000472", "CG-AC:RF000489", "CG-AC:RF000470" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/en/cf", "id": "CG-AC:AC114/en/cf", "type": "EvidenceNarrative", "narrative": "HHC is a disorder of iron metabolism characterized by an abnormally high absorption of dietary iron by the gastrointestinal mucosa. Iron overload may be detected biochemically as increased transferrin-iron saturation and increased serum ferritin concentrations. Clinical manifestations are due to excess iron which can be deposited in the liver, pancreas, heart joints, pituitary gland, skin, and testes. The rate of iron accumulation and the frequency and severity of clinical symptoms can vary markedly. Early symptoms include fatigue, weakness, joint pain, palpitations, abdominal pain, and weight loss. If left untreated, disease progression can lead to hyperpigmentation of the skin, arthritis, cirrhosis, diabetes mellitus, chronic abdominal pain, severe fatigue, hypopituitarism, hypogonadism, cardiomyopathy, primary liver cancer, or an increased risk of certain bacterial infections.", "evidenceDomainTag": "Nature of the Threat.Clinical Features", "publication": [ "CG-AC:RF000470", "CG-AC:RF000471", "CG-AC:RF000473" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/en/nh", "id": "CG-AC:AC114/en/nh", "type": "EvidenceNarrative", "narrative": "Symptoms of HHC typically appear between ages 40 and 60 in males and after menopause in females. The prevalence of both iron overload and clinical disease is generally higher in males than females. Presenting signs and symptoms of HHC also vary by sex, with women more likely to present with fatigue, arthralgia, and pigmentation changes and men presenting more often with symptoms of liver disease. Symptoms and disease complications increase with age. With disease progression, liver cirrhosis may develop and may be complicated by portal hypertension, hepatocellular carcinoma, and end-stage liver disease. By the time cirrhosis is recognized, approximately 50% have diabetes mellitus and 15% have congestive heart failure or arrhythmias. Patients diagnosed and treated prior to the development of cirrhosis have a normal life expectancy. Death most often occurs due to cirrhosis, primary liver cancer, diabetes, and cardiomyopathy. On the basis of clinically diagnosed or compatible disease age-adjusted mortality rates for hemochromatosis deaths in the US was 1.8 per million in 1992. These rates were about twice as high in males as in females, and in white persons as in nonwhite persons.\\n\\n\\nNot all cases of C282Y homozygotes or have iron overload and not all cases that have iron overload have iron deposits in tissues or organs to the degree that damage occurs. Additionally, no test can predict whether a C282Y homozygote will develop clinical disease manifestations. For cases of C282Y/H63D compound heterozygosity, few develop clinical manifestations, but among those who do, many have a complicating factor (e.g., fatty liver, viral hepatitis) that leads to iron overload.", "evidenceDomainTag": "Nature of the Threat.Natural History", "publication": [ "CG-AC:RF000473", "CG-AC:RF000471", "CG-AC:RF000472", "CG-AC:RF000489" ] } ], "tieredEvidenceNarratives": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/CDEC2994", "id": "CG-AC:AC114/ten/CDEC2994", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "Not provided", "narrative": "Given that the early symptoms of HFE-HHC (fatigue, joint pain, etc.) are nonspecific, HFE-HHC is often not diagnosed at the early stages. Even advanced complications (cardiomyopathy, liver cancer, etc.) are also common primary disorders, and thus iron overload can be missed unless it is screened for specifically.", "evidenceDomainTag": "Condition Escape Detection.Chances to Escape Clinical Detection", "publication": [ "CG-AC:RF000470" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/NOI2970", "id": "CG-AC:AC114/ten/NOI2970", "type": "TieredEvidenceNarrative", "narrative": "Surveillance to monitor serum iron levels is noninvasive and likely well tolerated in patients. Following initial diagnosis and/or presentation of symptoms, weekly or biweekly phlebotomy may be needed to reduce serum ferritin concentration to below 50ng/mL. However, maintenance therapy to keep serum ferritin concentrations below 50ng/mL typically occurs every 3 to 4 months for men and once or twice a year for women.", "evidenceDomainTag": "Acceptability of Intervention.Natures of Intervention" }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/PGM2939", "id": "CG-AC:AC114/ten/PGM2939", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "1", "narrative": "The allelic frequency of the C282Y variant in the general population (worldwide) has been estimated as 6.2%. Based on Hardy-Weinberg, the frequency of C282Y homozygotes is estimated as 0.38%. However, reported frequencies (worldwide) of homozygotes are higher at 0.41%. The US has an estimated prevalence of 0.44%. US prevalence estimates are lower among Hispanic persons (0.027%), Asian Americans (<0.001%), Pacific Islanders (0.012%), and black persons (0.014%). \\n\\n\\nThe carrier frequency of the H63D mutations is estimated as 22% in Europe and 23% in North America. C282Y/H63D compound heterozygosity of has a frequency of 2% in the European general population and in 2% in the for North America.", "evidenceDomainTag": "Threat Materialization Chances.Prevalences of the Genetic Mutation", "publication": [ "CG-AC:RF000471", "CG-AC:RF000489", "CG-AC:RF000470" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/ACPE4426", "id": "CG-AC:AC114/ten/ACPE4426", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "Not provided", "evidenceDomainTag": "Threat Materialization Chances.Penetrances" }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/ACPE4425", "id": "CG-AC:AC114/ten/ACPE4425", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "1", "narrative": "Penetrance is incomplete and is generally higher in males than females. Differences in inclusion criteria and the definition of biochemical and disease penetrance have produced a range of estimates for the penetrance of C282Y homozygosity. A summary of penetrance estimates from two meta-analysis are presented:\\n\\n\\nElevated transferrin saturation: Males = 75-94%, Females = 40-94%\\n\\nIncreased serum ferritin: Males = 32-76%, Females = 26-58%\\n\\nExcess liver iron: Males = 42%, Females = 19%, All = 24%\\n\\nDiabetes: All = 0-5.6%\\n\\nLiver fibrosis: Males = 18%, Females = 5%, All = 6%\\n\\nCirrhosis: Males = 6%, Females = 2%, All = 1.4%", "evidenceDomainTag": "Threat Materialization Chances.Penetrances", "publication": [ "CG-AC:RF000471", "CG-AC:RF000489", "CG-AC:RF000474" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/RR2728", "id": "CG-AC:AC114/ten/RR2728", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "1", "narrative": "A meta-analysis of 202 case-control studies indicated an increased risk for several outcomes among clinically ascertained (i.e. cases defined by disease status related to an organ):\\n\\n\\nC282Y homozygotes compared to controls:\\n\\n• Liver disease: OR=3.9 (99% CI: 1.9-8.1)\\n• Hepatocellular carcinoma: OR=11 (99% CI: 3.7-34)\\n• Hepatitis C: OR=4.1 (99% CI: 1.2-14)\\n• Nonalcoholic steahohepatitis: OR=10 (99% CI: 2.1-53) \\n• Porphyria cutanea tarda: OR=48 (99% CI: 24-95).\\n• Diabetes mellitus: OR=3.4 (99% CI: 1.1-11; among North Europeans only).\\n\\n\\nC282Y/H63D compound heterozygotes compared to controls:\\n• Porphyria cutanea tarda: OR=8.1 (99% CI: 3.9-17).", "evidenceDomainTag": "Threat Materialization Chances.Relative Risks", "publication": [ "CG-AC:RF000475" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/EN3023", "id": "CG-AC:AC114/ten/EN3023", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "3", "narrative": "The phenotypic expression of HFE-HHC is highly variable, including the rate of iron accumulation and the frequency and severity of clinical outcomes.", "evidenceDomainTag": "Threat Materialization Chances.Expressivity Notes", "publication": [ "CG-AC:RF000470" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/ten/REC2187", "id": "CG-AC:AC114/ten/REC2187", "type": "TieredEvidenceNarrative", "evidenceSourceTier": "5", "narrative": "A recent study has published penetrance estimates from the eMERGE Network:\\n\\nC282Y homozygotes: \\n\\nElevated transferrin saturation: Males = 100%, Females = 50%\\n\\nIncreased serum ferritin: Males = 78%, Females = 31%\\n\\nDiabetes: Males = 45%, Females = 12%\\n\\nCirrhosis: Males = 5%, Females = 3%\\n\\n\\n\\nC282Y/H63D compound heterozygotes:\\n\\nElevated transferrin saturation: Males = 38%, Females = 38%\\n\\nIncreased serum ferritin: Males = 33%, Females = 30%\\n\\nDiabetes: Males = 28%, Females = 20%\\n\\nCirrhosis: Males = 5%, Females = 5%", "evidenceDomainTag": "Threat Materialization Chances.Penetrances", "publication": [ "CG-AC:RF000474" ] } ], "tieredRecommendations": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/tr/ACCA3638", "id": "CG-AC:AC114/tr/ACCA3638", "type": "TieredRecommendation", "evidenceSourceTier": "3", "recommendation": "Medicinal iron, mineral supplements, excess vitamin C, uncooked seafood, and alcohol consumption in those with hepatic involvement.", "evidenceDomainTag": "Effectiveness of Intervention.Circumstances to Avoid", "publication": [ "CG-AC:RF000473" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/tr/ACPM6332", "id": "CG-AC:AC114/tr/ACPM6332", "type": "TieredRecommendation", "evidenceSourceTier": "3", "recommendation": "To establish the extent of disease, the following evaluations are recommended at the initial diagnosis of an individual determined to be a C282Y homozygote:\\n\\n• Serum ferritin concentrations should be measured to establish disease status and prognosis. \\n\\n• MRI to estimate parenchymal iron content, including the liver and possibly the heart\\n\\n• When serum ferritin and liver enzyme levels are abnormal, liver biopsy can establish or exclude cirrhosis.\\n\\n• Consultation with a medical geneticist and/or genetic counselor.", "evidenceDomainTag": "Effectiveness of Intervention.Patient Managements", "publication": [ "CG-AC:RF000473" ] }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/tr/ACSU3930", "id": "CG-AC:AC114/tr/ACSU3930", "type": "TieredRecommendation", "evidenceSourceTier": "2", "recommendation": "C282Y homozygotes without evidence for iron overload could be monitored annually and treatment instituted when the ferritin rises above normal. Phlebotomy is the mainstay of treatment once iron overload is present. There is little evidence to guide when to initiate phlebotomy, though the threshold is typically any ferritin level above the normal range. Though there is no survival data specific to homozygous C282Y, phlebotomy has been shown to be effective in clinically diagnosed hemochromatosis: 5-year survival of 93% for adequately phlebotomized patients compared to 48% for inadequately phlebotomized patients (10-year survival of 78% and 32%, respectively). Survival of treated patients without cirrhosis and diabetes has been found to be equivalent to that of the normal population, whereas those with these complications have a significantly reduced survival, indicating the benefits of the early initiation of iron removal.", "evidenceDomainTag": "Effectiveness of Intervention.Surveillances", "publication": [ "CG-AC:RF000471" ] } ] }, "evidenceCategory": { "outcomeEvidenceItem": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei", "id": "CG-AC:AC114/oei", "type": "EvidenceItem", "natureOfTheThreat": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/nott", "id": "CG-AC:AC114/oei/nott", "type": "EvidenceLine", "prevalenceOfTheGeneticDisorder": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/pgd", "id": "CG-AC:AC114/oei/pgd", "type": "EvidenceItem", "keyText": "1-2 in 500", "sourceOfPopulation": "General population", "evidenceNarrative": { "@id": "CG-AC:AC114/en/potgd" } }, "clinicalFeatures": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/cf", "id": "CG-AC:AC114/oei/cf", "type": "EvidenceItem", "evidenceNarrative": { "@id": "CG-AC:AC114/en/cf" } }, "naturalHistory": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/nh", "id": "CG-AC:AC114/oei/nh", "type": "EvidenceItem", "evidenceNarrative": { "@id": "CG-AC:AC114/en/nh" } } }, "threatMaterializationChances": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/tmc", "id": "CG-AC:AC114/oei/tmc", "type": "EvidenceLine", "modeOfInheritance": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/moi", "id": "CG-AC:AC114/oei/moi", "type": "EvidenceItem", "keyText": "Autosomal Recessive", "evidenceNarrative": { "@id": "CG-AC:AC114/en/ACMI2794" } }, "prevalenceOfTheGeneticMutation": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/pgm", "id": "CG-AC:AC114/oei/pgm", "type": "EvidenceItem", "keyText": ">1-2 in 100", "sourceOfPopulation": "Other", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/PGM2939" } }, "penetrance": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/pe/ACPE4425", "id": "CG-AC:AC114/oei/pe/ACPE4425", "type": "EvidenceItem", "keyText": ">= 40 %", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/ACPE4425" } }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/pe/REC2187", "id": "CG-AC:AC114/oei/pe/REC2187", "type": "EvidenceItem", "keyText": ">= 40 %", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/REC2187" } }, { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/pe/ACPE4426", "id": "CG-AC:AC114/oei/pe/ACPE4426", "type": "EvidenceItem", "keyText": "Unknown", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/ACPE4426" } } ], "relativeRisk": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/rr/RR2728", "id": "CG-AC:AC114/oei/rr/RR2728", "type": "EvidenceItem", "keyText": ">3", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/RR2728" } } ], "expressivity": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/oei/ex/EN3023", "id": "CG-AC:AC114/oei/ex/EN3023", "type": "EvidenceItem", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/EN3023" } } ] } }, "interventionEvidenceItem": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei", "id": "CG-AC:AC114/iei", "type": "EvidenceItem", "acceptabilityOfIntervention": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/aoi", "id": "CG-AC:AC114/iei/aoi", "type": "EvidenceLine", "natureOfIntervention": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/noi/NOI2970", "id": "CG-AC:AC114/iei/noi/NOI2970", "type": "EvidenceItem", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/NOI2970" } } ] }, "effectivenessOfIntervention": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/eoi", "id": "CG-AC:AC114/iei/eoi", "type": "EvidenceLine", "patientManagement": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/pm/ACPM6332", "id": "CG-AC:AC114/iei/pm/ACPM6332", "type": "EvidenceItem", "tieredRecommendation": { "@id": "CG-AC:AC114/tr/ACPM6332" } } ], "circumstanceToAvoid": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/cta/ACCA3638", "id": "CG-AC:AC114/iei/cta/ACCA3638", "type": "EvidenceItem", "tieredRecommendation": { "@id": "CG-AC:AC114/tr/ACCA3638" } } ], "surveillance": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/su/ACSU3930", "id": "CG-AC:AC114/iei/su/ACSU3930", "type": "EvidenceItem", "tieredRecommendation": { "@id": "CG-AC:AC114/tr/ACSU3930" } } ] }, "conditionEscapeDetection": { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/ced", "id": "CG-AC:AC114/iei/ced", "type": "EvidenceLine", "chanceToEscapeDetection": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/AC114/iei/cted/CDEC2994", "id": "CG-AC:AC114/iei/cted/CDEC2994", "type": "EvidenceItem", "tieredEvidenceNarrative": { "@id": "CG-AC:AC114/ten/CDEC2994" } } ] } } }, "references": [ { "@id": "https://actionability.clinicalgenome.org/ac/Adult/api/sepio/doc/RF000470", "id": "CG-AC:RF000470", "type": "Publication", "publicationType": "PMID", "citation": "Hanson EH, Imperatore G, Burke W. 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(2006) 145(3):209-23.", "webUrl": "https://www.ncbi.nlm.nih.gov/pubmed/?term=16880463", "xdbref": [ "PMID:16880463" ] } ] }