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Lertrit, P. et al.

A new disease-related mutation for mitochondrial encephalopathy lactic acidosis and strokelike episodes (MELAS) syndrome affects the ND4 subunit of the respiratory complex I.

The molecular lesions in two patients exhibiting classical clinical manifestations of MELAS (mitochondrial encephalopathy, lactic acidosis, and strokelike episodes) syndrome have been investigated. A recently reported disease-related A----G base substitution at nt 3243 of the mtDNA, in the DHU loop of tRNA(Leu), was detected by restriction-enzyme analysis of the relevant PCR-amplified segment of the mtDNA of one patient but was not observed, by either restriction-enzyme analysis or nucleotide sequencing, in the other. To define the molecular lesion in the patient who does not have the A----G base substitution at nt 3243, the total mitochondrial genome of the patient has been sequenced. An A----G base substitution at nt 11084, leading to a Thr-to-Ala amino acid replacement in the ND4 subunit of the respiratory complex I, is suggested to be a disease-related mutation.[1]

References

A new disease-related mutation for mitochondrial encephalopathy lactic acidosis and strokelike episodes (MELAS) syndrome affects the ND4 subunit of the respiratory complex I. Lertrit, P., Noer, A.S., Jean-Francois, M.J., Kapsa, R., Dennett, X., Thyagarajan, D., Lethlean, K., Byrne, E., Marzuki, S. Am. J. Hum. Genet. (1992) [Pubmed]

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