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. 1994 Sep;55(3):437–446.

Maternally inherited hypertrophic cardiomyopathy due to a novel T-to-C transition at nucleotide 9997 in the mitochondrial tRNA(glycine) gene.

F Merante 1, I Tein 1, L Benson 1, B H Robinson 1
PMCID: PMC1918404  PMID: 8079988

Abstract

We report a unique heteroplasmic T-to-C transition at nucleotide 9997 in the mitochondrial tRNA(glycine) gene in a multiplex family who manifested nonobstructive cardiomyopathy. The degree of mtDNA heteroplasmy generally correlated with the severity of the symptoms. This T-to-C transition disrupts hydrogen bonding in the region adjacent to the acceptor stem of the tRNA molecule. The thymine residue at position 9997 is highly conserved in mammals, as well as in various vertebrates and invertebrates. A PCR diagnostic test for the presence of the 9997 T-to-C transition revealed that the base change was always present in high proportion in affected family members, not present in unaffected family members, and never present in control subjects from various ethnic groups (25 groups sampled, 42 individuals), thus ruling out the possibility that this change represents a polymorphic variant in the general population. The degree of heteroplasmy in lymphoblast cultures also correlated with the level of enzyme activity present for cytochrome c oxidase (complex IV) and succinate cytochrome c oxidoreductase (complexes II and III). The absence of previously reported mtDNA mutations associated with hypertrophic cardiomyopathy was verified by both PCR diagnostic procedures and sequence analysis. All mitochondrial tRNA genes, as well as genes encoding ATPase subunits 6 and 8, were sequenced and found not to possess base changes consistent with the clinical profile. More detailed biochemical and molecular biological investigations are discussed.

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Selected References

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