Cardiomyopathy with lethal arrhythmias associated with inactivation of KLHL24

Abstract Hypertrophic cardiomyopathy (HCM) is the most common inherited cardiovascular disorder, yet the genetic cause of up to 50% of cases remains unknown. Here, we show that mutations in KLHL24 cause HCM in humans. Using genome-wide linkage analysis and exome sequencing, we identified homozygous...

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Published in:Human molecular genetics 2019-06, Vol.28 (11), p.1919-1929
Main Authors: Hedberg-Oldfors, Carola, Abramsson, Alexandra, Osborn, Daniel P S, Danielsson, Olof, Fazlinezhad, Afsoon, Nilipour, Yalda, Hübbert, Laila, Nennesmo, Inger, Visuttijai, Kittichate, Bharj, Jaipreet, Petropoulou, Evmorfia, Shoreim, Azza, Vona, Barbara, Ahangari, Najmeh, López, Marcela Dávila, Doosti, Mohammad, Banote, Rakesh Kumar, Maroofian, Reza, Edling, Malin, Taherpour, Mehdi, Zetterberg, Henrik, Karimiani, Ehsan Ghayoor, Oldfors, Anders, Jamshidi, Yalda
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Language:eng
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Summary:Abstract Hypertrophic cardiomyopathy (HCM) is the most common inherited cardiovascular disorder, yet the genetic cause of up to 50% of cases remains unknown. Here, we show that mutations in KLHL24 cause HCM in humans. Using genome-wide linkage analysis and exome sequencing, we identified homozygous mutations in KLHL24 in two consanguineous families with HCM. Of the 11 young affected adults identified, 3 died suddenly and 1 had a cardiac transplant due to heart failure. KLHL24 is a member of the Kelch-like protein family, which acts as substrate-specific adaptors to Cullin E3 ubiquitin ligases. Endomyocardial and skeletal muscle biopsies from affected individuals of both families demonstrated characteristic alterations, including accumulation of desmin intermediate filaments. Knock-down of the zebrafish homologue klhl24a results in heart defects similar to that described for other HCM-linked genes providing additional support for KLHL24 as a HCM-associated gene. Our findings reveal a crucial role for KLHL24 in cardiac development and function.
ISSN:0964-6906
1460-2083
1460-2083