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• W2897215745 abstract "Abstract Background Isolated cardiac arrhythmia due to a variant in CACNA1C is of recent knowledge. Most reports have been of singleton cases or of quite small families, and estimates of penetrance and expressivity have been difficult to obtain. We here describe a large pedigree, from which such estimates have been calculated. Methods We studied a five‐generation family, in which a CACNA1C variant c.2573G>A p.Arg858His co‐segregates with syncope and cardiac arrest, documenting electrocardiographic data and cardiac symptomatology. The reported patients/families from the literature with CACNA1C gene variants were reviewed, and genotype–phenotype correlations are drawn. Results The range of phenotype in the studied family is wide, from no apparent effect, through an asymptomatic QT interval prolongation on electrocardiography, to episodes of presyncope and syncope, ventricular fibrillation, and sudden death. QT prolongation showed inconsistent correlation with functional cardiology. Based upon analysis of 28 heterozygous family members, estimates of penetrance and expressivity are derived. Conclusions These estimates of penetrance and expressivity, for this specific variant, may be useful in clinical practice. Review of the literature indicates that individual CACNA1C variants have their own particular genotype–phenotype correlations. We suggest that, at least in respect of the particular variant reported here, “arrhythmogenic channelopathy” may be a more fitting nomenclature than long QT syndrome." @default.
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• W2897215745 date "2018-10-21" @default.
• W2897215745 modified "2023-09-26" @default.
• W2897215745 title "Penetrance and expressivity of the R858H<i>CACNA1C</i>variant in a five-generation pedigree segregating an arrhythmogenic channelopathy" @default.
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• W2897215745 doi "https://doi.org/10.1002/mgg3.476" @default.
• W2897215745 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6382452" @default.
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