Abstract:
:Mutations in human mitochondrial tRNA genes are associated with a number of multisystemic disorders. Using an assay that combines tRNA oxidation and circularization we have determined the relative amounts and states of aminoacylation of mutant and wild-type tRNAs in tissue samples from patients with MELAS syndrome (mito- chondrial myopathy, encephalopathy, lactic acidosis, stroke-like episodes) and MERRF syndrome (myoclonus epilepsy with ragged red fibers), respectively. In most, but not all, biopsies from MELAS patients carrying the A3243G substitution in the mitochondrial tRNA(Leu(UUR))gene, the mutant tRNA is under-represented among processed and/or aminoacylated tRNAs. In contrast, in biopsies from MERRF patients harboring the A8344G substitution in the tRNA(Lys)gene neither the relative abundance nor the aminoacylation of the mutated tRNA is affected. Thus, whereas the A3243G mutation may contribute to the pathogenesis of MELAS by reducing the amount of aminoacylated tRNA(Leu), the A8344G mutation does not affect tRNA(Lys)function in the same way.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Börner GV,Zeviani M,Tiranti V,Carrara F,Hoffmann S,Gerbitz KD,Lochmüller H,Pongratz D,Klopstock T,Melberg A,Holme E,Pääbo Sdoi
10.1093/hmg/9.4.467subject
Has Abstractpub_date
2000-03-01 00:00:00pages
467-75issue
4eissn
0964-6906issn
1460-2083pii
ddd071journal_volume
9pub_type
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