Mitochondrial DNA genetics and the heteroplasmy conundrum in evolution and disease.

Wallace DC, Chalkia D
Cold Spring Harbor perspectives in biology · 2013 · doi:10.1101/cshperspect.a021220 · PMID:24186072 · PMC3809581
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This paper explores how mitochondrial DNA's unique genetics, high mutation rate, and heteroplasmy affect complex diseases, posing challenges for diagnosis and prevention.

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This review examines the unique genetic properties of mitochondrial DNA, including its maternal inheritance pattern, high copy number per cell, and elevated mutation rate. It highlights the phenomenon of heteroplasmy, where new mutations exist alongside wild-type sequences, and notes that the mechanisms driving these variants to predominate in germline and somatic tissues remain poorly understood. The authors emphasize that this lack of understanding complicates the diagnosis and prevention of mitochondrial diseases due to significant clinical variability. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The unorthodox genetics of the mtDNA is providing new perspectives on the etiology of the common "complex" diseases. The maternally inherited mtDNA codes for essential energy genes, is present in thousands of copies per cell, and has a very high mutation rate. New mtDNA mutations arise among thousands of other mtDNAs. The mechanisms by which these "heteroplasmic" mtDNA mutations come to predominate in the female germline and somatic tissues is poorly understood, but essential for understanding the clinical variability of a range of diseases. Maternal inheritance and heteroplasmy also pose major challengers for the diagnosis and prevention of mtDNA disease.
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Mitochondrial DNA Genetics and the Heteroplasmy Conundrum in Evolution and Disease - Center for Mitochondrial and Epigenomic Medicine, The Children's Hospital of Philadelphia, Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104 - Correspondence: wallaced1{at}email.chop.edu Abstract The unorthodox genetics of the mtDNA is providing new perspectives on the etiology of the common “complex” diseases. The maternally inherited mtDNA codes for essential energy genes, is present in thousands of copies per cell, and has a very high mutation rate. New mtDNA mutations arise among thousands of other mtDNAs. The mechanisms by which these “heteroplasmic” mtDNA mutations come to predominate in the female germline and somatic tissues is poorly understood, but essential for understanding the clinical variability of a range of diseases. Maternal inheritance and heteroplasmy also pose major challengers for the diagnosis and prevention of mtDNA disease. - Copyright © 2013 Cold Spring Harbor Laboratory Press; all rights reserved

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