Exome sequencing identifies MRPL3 mutation in mitochondrial cardiomyopathy

✍ Scribed by Louise Galmiche; Valérie Serre; Marine Beinat; Zahra Assouline; Anne-Sophie Lebre; Dominique Chretien; Patrick Nietschke; Vladimir Benes; Nathalie Boddaert; Daniel Sidi; Francis Brunelle; Marlène Rio; Arnold Munnich; Agnès Rötig

• Book ID: 102260692
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 426 KB
• Volume: 32
• Category: Article
• ISSN: 1059-7794
• DOI: 10.1002/humu.21562

✦ Synopsis

By combining exome sequencing in conjunction with genetic mapping, we have identified the first mutation in large mitochondrial ribosomal protein MRPL3 in a family of four sibs with hypertrophic cardiomyopathy, psychomotor retardation, and multiple respiratory chain deficiency. Affected sibs were compound heterozygotes for a missense MRPL3 mutation (P317R) and a large-scale deletion, inherited from the mother and the father, respectively. These mutations were shown to alter ribosome assembly and cause a mitochondrial translation deficiency in cultured skin fibroblasts resulting in an abnormal assembly of several complexes of the respiratory chain. This observation gives support to the view that exome sequencing combined with genetic mapping is a powerful approach for the identification of new genes of mitochondrial disorders.