Sporadic intragenic inversion of the mitochondrial DNA MTND1 gene causing fatal infantile lactic acidosis

Emma L. Blakely, Katherine J. Rennie, Linda Jones, Mattias Elstner, Zofia M.A. Chrzanowska-Lightowlers, Christopher Bradford White, Julian P.H. Shield, Daniela T. Pilz, Douglass M. Turnbull, Joanna Poulton, Robert W. Taylor

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11 Scopus citations

Abstract

Mutations of mitochondrial DNA (mtDNA) are an important cause of genetic disease, yet rarely present in the neonatal period. Here we report the clinical, biochemical, and molecular genetic findings of an infant who died at the age of 1 mo with marked biventricular hypertrophy, aortic coarctation, and severe lactic acidosis due to a previously described but unusual mtDNA mutation, a 7-bp intragenic inversion within the mitochondrial gene encoding ND1 protein of complex I (MTND1). In direct contrast to the previous case, an adult with exercise intolerance who only harbored the mutation in muscle, the MTND1 inversion in our patient was present at high levels in several tissues including the heart, muscle, liver, and cultured skin fibroblasts. There was no evidence of the mutation or respiratory complex I defect in a muscle biopsy from the patient's mother. Transmitochondrial cytoplasmic hybrids (cybrids) containing high mutant loads of the inversion expressed the biochemical defect but apparently normal levels of the assembled complex. Our report highlights the enormous phenotypic diversity that exists among pathogenic mtDNA mutations and reemphasizes the need for appropriate genetic counseling for families affected by mtDNA disease.

Original languageEnglish (US)
Pages (from-to)440-444
Number of pages5
JournalPediatric research
Volume59
Issue number3
DOIs
StatePublished - Mar 1 2006

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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    Blakely, E. L., Rennie, K. J., Jones, L., Elstner, M., Chrzanowska-Lightowlers, Z. M. A., White, C. B., Shield, J. P. H., Pilz, D. T., Turnbull, D. M., Poulton, J., & Taylor, R. W. (2006). Sporadic intragenic inversion of the mitochondrial DNA MTND1 gene causing fatal infantile lactic acidosis. Pediatric research, 59(3), 440-444. https://doi.org/10.1203/01.pdr.0000198771.78290.c4