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.
journal_name
Mol Genet Genomic Medjournal_title
Molecular genetics & genomic medicineauthors
Gardner RJM,Crozier IG,Binfield AL,Love DR,Lehnert K,Gibson K,Lintott CJ,Snell RG,Jacobsen JC,Jones PP,Waddell-Smith KE,Kennedy MA,Skinner JRdoi
10.1002/mgg3.476subject
Has Abstractpub_date
2019-01-01 00:00:00pages
e00476issue
1issn
2324-9269journal_volume
7pub_type
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