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Nat Ecol Evol. 2017 Sep;1(9):1400-1406. doi: 10.1038/s41559-017-0276-6. Epub 2017 Aug 21.

Mother's curse neutralizes natural selection against a human genetic disease over three centuries.

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Department of Chemistry, Biochemistry and Physics, and Forensic Research Group, Université du Québec à Trois-Rivières, Trois-Rivières, Québec, G9A 5H7, Canada.
CHU Sainte-Justine Research Center, Université de Montréal, Montréal, Québec, H3T 1C5, Canada.
Department of Demography & Institut de Recherche en Santé Publique, Université de Montréal, Montréal, Québec, H3T 1N8, Canada.
PRIMUS Research Group, Department of Family Medicine, Université de Sherbrooke, Sherbrooke, Québec, J1H 5N4, Canada.
Departments of Neurology and Neurosurgery and Human Genetics, McGill University, Montreal Neurological Institute, Montréal, Québec, H3A 2B4, Canada.
Department of Pediatrics, Université de Montréal, Montréal, Québec, H3T 1C5, Canada.


According to evolutionary theory, mitochondria could be poisoned gifts that mothers transmit to their sons. This is because mutations harmful to males are expected to accumulate in the mitochondrial genome, the so-called 'mother's curse'. However, the contribution of the mother's curse to the mutation load in nature remains largely unknown and hard to predict, because compensatory mechanisms could impede the spread of deleterious mitochondria. Here we provide evidence for the mother's curse in action over 290 years in a human population. We studied a mutation causing Leber's hereditary optical neuropathy, a disease with male-biased prevalence and which has long been suspected to be maintained in populations by the mother's curse. Male carriers showed a low fitness relative to non-carriers and to females, mostly explained by their high rate of infant mortality. Despite poor male fitness, selection analysis predicted a slight (albeit non-significant) increase in frequency, which sharply contrasts with the 35.5% per-generation decrease predicted if mitochondrial DNA transmission had been through males instead of females. Our results are therefore even suggestive of positive selection through the female line that may exacerbate effects of the mother's curse. This study supports a contribution of the mother's curse to the reduction of male lifespan, uncovering a large fitness effect associated with a single mitochondrial variant.

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