Novel mutations in the thymidine kinase 2 gene (TK2) associated with fatal mitochondrial myopathy and mitochondrial DNA depletion.

Research paper by Már M Tulinius, Ali-Reza AR Moslemi, Niklas N Darin, Elisabeth E Holme, Anders A Oldfors

Indexed on: 24 May '05Published on: 24 May '05Published in: Neuromuscular Disorders


We describe the clinical, morphological and genetic findings in two siblings with the myopathic form of mitochondrial DNA depletion syndrome (MIM 251880). Sequencing of the thymidine kinase-2 gene revealed two heterozygous missense mutations, a C-->T mutation at nucleotide 191 resulting in a change of threonine to methionine at residue 64 in exon 3, and a C-->T mutation at nucleotide 547 resulting in an arginine to tryptophan amino acid change at residue 183 in exon 8. Both mutations changed highly conserved residues in the gene and neither one has been described previously. This report extends the phenotypic expression of mutations in the thymidine kinase-2 gene.

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