Journal Article

Mitochondrial myopathy induces a starvation-like response

Henna Tyynismaa, Christopher J. Carroll, Nuno Raimundo, Sofia Ahola-Erkkilä, Tina Wenz, Heini Ruhanen, Kilian Guse, Akseli Hemminki, Katja E. Peltola-Mjøsund, Valtteri Tulkki, Matej Orešič, Carlos T. Moraes, Kirsi Pietiläinen, Iiris Hovatta and Anu Suomalainen

in Human Molecular Genetics

Volume 19, issue 20, pages 3948-3958
Published in print October 2010 | ISSN: 0964-6906
Published online July 2010 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddq310
Mitochondrial myopathy induces a starvation-like response

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Mitochondrial respiratory chain (RC) deficiency is among the most common causes of inherited metabolic disease, but its physiological consequences are poorly characterized. We studied the skeletal muscle gene expression profiles of mice with late-onset mitochondrial myopathy. These animals express a dominant patient mutation in the mitochondrial replicative helicase Twinkle, leading to accumulation of multiple mtDNA deletions and progressive subtle RC deficiency in the skeletal muscle. The global gene expression pattern of the mouse skeletal muscle showed induction of pathways involved in amino acid starvation response and activation of Akt signaling. Furthermore, the muscle showed induction of a fasting-related hormone, fibroblast growth factor 21 (Fgf21). This secreted regulator of lipid metabolism was also elevated in the mouse serum, and the animals showed widespread changes in their lipid metabolism: small adipocyte size, low fat content in the liver and resistance to high-fat diet. We propose that RC deficiency induces a mitochondrial stress response, with local and global changes mimicking starvation, in a normal nutritional state. These results may have important implications for understanding the metabolic consequences of mitochondrial myopathies.

Journal Article.  6441 words.  Illustrated.

Subjects: Genetics and Genomics

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