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The Pedigree Rate of Sequence Divergence in the Human Mitochondrial Genome. There Is a Difference between Phylogenetic and Pedigree Rates

Citation

Howell, N and Smejkal, CB and Mackey, DA and Chinnery, PF and Turnbull, DM and Herrnstadt, C, The Pedigree Rate of Sequence Divergence in the Human Mitochondrial Genome. There Is a Difference between Phylogenetic and Pedigree Rates, American Journal of Human Genetics, 72, (3) pp. 659-70. ISSN 0002-9297 (2003) [Refereed Article]

DOI: doi:10.1086/368264

Abstract

We have extended our previous analysis of the pedigree rate of control-region divergence in the human mitochondrial genome. One new germline mutation in the mitochondrial DNA (mtDNA) control region was detected among 185 transmission events (generations) from five Leber hereditary optic neuropathy (LHON) pedigrees. Pooling the LHON pedigree analyses yields a control-region divergence rate of 1.0 mutation/bp/106 years (Myr). When the results from eight published studies that used a similar approach were pooled with the LHON pedigree studies, totaling >2,600 transmission events, a pedigree divergence rate of 0.95 mutations/bp/Myr for the control region was obtained with a 99.5% confidence interval of 0.53-1.57. Taken together, the cumulative results support the original conclusion that the pedigree divergence rate for the control region is ∼10-fold higher than that obtained with phylogenetic analyses. There is no evidence that any one factor explains this discrepancy, and the possible roles of mutational hotspots (rate heterogeneity), selection, and random genetic drift and the limitations of phylogenetic approaches to deal with high levels of homoplasy are discussed. In addition, we have extended our pedigree analysis of divergence in the mtDNA coding region. Finally, divergence of complete mtDNA sequences was analyzed in two tissues, white blood cells and skeletal muscle, from each of 17 individuals. In three of these individuals, there were four instances in which an mtDNA mutation was found in one tissue but not in the other. These results are discussed in terms of the occurrence of somatic mtDNA mutations.

Item Details

Item Type:Refereed Article
Research Division:Medical and Health Sciences
Research Group:Ophthalmology and Optometry
Research Field:Ophthalmology
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Hearing, Vision, Speech and Their Disorders
Author:Mackey, DA (Professor David Mackey)
ID Code:49036
Year Published:2003
Web of Science® Times Cited:162
Deposited By:Menzies Institute for Medical Research
Deposited On:2007-08-01
Last Modified:2011-09-15
Downloads:0

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