Intragenic TTN Deletions in a Single Family with Dilated Cardiomyopathy

Marketa Wayhelova,1 Petra Peldova,1 Alice Krebsova,2 Michaela Nemcikova,3 Matej Sojka,4 Milan Macek1 1Department of Biology and Medical Genetics, 2nd Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic; 2Department of Cardiology, Center for Inherited Cardiovascular Diseases, IKEM, Prague, Czech Republic; 3Department of Genetics and Molecular Diagnostics, Liberec Regional Hospital, Liberec, Czech Republic; 4Cardiovascular centre, Liberec Regional Hospital, Liberec, Czech RepublicCorrespondence: Marketa Wayhelova, Department of Biology and Medical Genetics, 2 nd Faculty of Medicine, Charles University and Motol University Hospital, V Úvalu 84/1, 150 06, Prague 5, Czech Republic, Email [email protected]: The TTN gene (MIM:188840) encodes titin, the largest human protein with exclusive expression in the cardiac and skeletal muscles. Rare variants disrupting the TTN gene are frequent causes of dilated cardiomyopathy and several forms of skeletal myopathy. We report a unique occurrence of two novel, distinct but overlapping intragenic TTN deletions in multiple relatives from a single Czech family with the clinical manifestation of dilated cardiomyopathy (DCM). After clinical exome sequencing using the custom virtual gene panel, two distinct deletions affecting the TTN gene (NM_001267550.2) were detected. The first deletion (3.599 kb in length) encompasses five exons with the breakpoints in exons 326 and 330. The longer one (4.859 kb in length) disrupts exon 326 only. Both deletions segregate with the cardiomyopathy phenotype, and none of the tested individuals carry both. The familial segregation of two distinct intragenic TTN deletions extends the broad spectrum of rare variants in the pathogenesis of DCM. The presence of severely affected carriers of the reported DNA variants and obligatory healthy non-carriers raises the debate on their ancestral origin. Our data demonstrate the clinical benefits of the family cascade screening and molecular genetic analysis in familial DCM, enabling early and effective multidisciplinary medical care.Keywords: TTN gene, dilated cardiomyopathy, clinical exome sequencing, copy-number variation, deletion