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Mitochondrial DNA m.3242G > A mutation, an under diagnosed cause of hypertrophic cardiomyopathy and renal tubular dysfunction?

Lookup NU author(s): Professor Robert Taylor


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We present two new patients with the recently described mitochondrial m. 3242G > A mutation. Although the mutation is situated next to the well known m.3243A > G mutation, the most common alteration associated with mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) syndrome, the clinical presentation is quite different, but characteristic. All three m. 3242G > A patients presented in the neonatal period with hypertrophic and dilated cardiomyopathy, generalized muscle hypotonia and lactic acidosis. Two additionally had creatine kinase elevation, renal tubular acidosis/dysfunction and showed a mild clinical course with a favourable psychomotor development. The third patient had more neurological involvement and died in infancy. The mutation occurred de novo in the two patients where maternal investigations were performed. The combination of hypertrophic cardiomyopathy and renal tubular acidosis/renal tubular dysfunction is clinically distinctive and may represent a separate entity. (C) 2012 Elsevier Masson SAS. All rights reserved.

Publication metadata

Author(s): Wortmann SB, Champion MP, van den Heuvel L, Barth H, Trutnau B, Craig K, Lammens M, Schreuder MF, Taylor RW, Smeitink JAM, Wevers RA, Rodenburg RJ, Morava E

Publication type: Article

Publication status: Published

Journal: European Journal of Medical Genetics

Year: 2012

Volume: 55

Issue: 10

Pages: 552-556

Print publication date: 01/10/2012

ISSN (print): 1769-7212

ISSN (electronic): 1878-0849

Publisher: Elsevier Masson


DOI: 10.1016/j.ejmg.2012.06.002


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