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Disorders caused by defects in the mitochondrial translation system are clinically and genetically heterogeneous. The elongation phase of mitochondrial protein synthesis requires, among many other components, three nuclear-encoded elongation factors: EFTu (TUFM; 602389), EFTs (TSFM; 604723), and EFG1 (GFM1; 606639). Mutations have been identified in the genes encoding all three elongation factors, and they result in severe phenotypes with an early fatal outcome [2]?and?[3]. Usually, a combined respiratory chain (RC) deficiency is found, i.e. decreased activity of two or more RC complexes, excluding complex II, which is the only complex where the subunits are encoded entirely by the nuclear genome. So far, only eleven patients have been reported with mutations in GFM1 [3], [4], [5], [6], [7], [8]?and?[9]. Here we describe an additional https://en.wikipedia.org/wiki/Calpain three patients with novel GFM1 mutations. Patient 1 was a boy, the first of three children from healthy Danish parents. The parents were consanguineous since they had common second great grandparents. He was born at term after a normal http://www.selleckchem.com/products/Belinostat.html pregnancy and delivery. All birth parameters were below average, weight was 2200?g (?2.5?mmol/l), standard base-excess ??25.1 (NV +/??3) and serum lactate of 23.4?mmol/l (NV http://www.selleckchem.com/products/FK-506-(Tacrolimus).html normalized and he became clinically stable. At three months, a brain CT showed bilateral temporal cortical atrophy and widespread hypodense areas in the white matter. He had poor eye contact and his mental development was markedly delayed. He developed liver failure with coagulopathy and encephalopathy and died at four months of age. A muscle biopsy showed hypotrophic muscle fibers and abnormal lipid vacuoles in the sarcoplasm. An autopsy showed severely disordered cortical migration with polymicrogyria, glandular hypospadia, micronodular cirrhosis and germ cell hypoplasia. Patient 2 was the younger sister of patient 1, born two and a half years later. She was born after a normal pregnancy and delivery at 38?weeks. The birth parameters were all