Identification of a novel titin-cap/telethonin mutation in a Portuguese family with hypertrophic cardiomyopathy

Toste, A.; Perrot, A.; Özcelik, C.; Cardim, N.

Identification of a novel titin-cap/telethonin mutation in a Portuguese family with hypertrophic cardiomyopathy

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Item Type:	Article
Title:	Identification of a novel titin-cap/telethonin mutation in a Portuguese family with hypertrophic cardiomyopathy
Creators Name:	Toste, A., Perrot, A., Özcelik, C. and Cardim, N.
Abstract:	INTRODUCTION AND OBJECTIVES: Hypertrophic cardiomyopathy (HCM) is a genetically and phenotypically heterogeneous disease; there is still a large proportion of patients with no identified disease-causing mutation. Although the majority of mutations are found in the MYH7 and MYBPC3 genes, mutations in Z-disk-associated proteins have also been linked to HCM. METHODS: We assessed a small family with HCM based on family history, physical examination, 12-lead ECG, echocardiogram and magnetic resonance imaging. After exclusion of mutations in eleven HCM disease genes, we performed direct sequencing of the TCAP gene encoding the Z-disk protein titin-cap (also known as telethonin). RESULTS: We present a novel TCAP mutation in a small family affected by HCM. The identified p.C57W mutation showed a very low population frequency, as well as high conservation across species. All of the bioinformatic prediction tools used considered this mutation to be damaging/deleterious. Family members were screened for this new mutation and a co-segregation pattern was detected. Both affected members of this family presented with late-onset HCM, moderate asymmetric left ventricular hypertrophy, atrial fibrillation and heart failure with preserved ejection fraction and low risk of sudden cardiac death. CONCLUSIONS: We present evidence supporting the classification of the TCAP p.C57W mutation, encoding the Z-disk protein titin-cap/telethonin as a new likely pathogenic variant of hypertrophic cardiomyopathy, with a specific phenotype in the family under analysis.
Keywords:	Hypertrophic Cardiomyopathy, TCAP Mutation, Titin-Cap, Telethonin, Likely Pathogenic Variant
Source:	Revista Portuguesa de Cardiologia
ISSN:	0870-2551
Publisher:	Elsevier
Volume:	39
Number:	6
Page Range:	317-327
Date:	June 2020
Official Publication:	https://doi.org/10.1016/j.repc.2019.12.007
PubMed:	View item in PubMed

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