journal article Open Access Jun 19, 2014

Different degree of paternal mtDNA leakage between male and female progeny in interspecific Drosophila crosses

Ecology and Evolution Vol. 4 No. 13 pp. 2633-2641 · Wiley
View at Publisher Save 10.1002/ece3.1069
Abstract
AbstractMaternal transmission of mitochondrial DNA (mtDNA) in animals is thought to prevent the spread of selfish deleterious mtDNA mutations in the population. Various mechanisms have been evolved independently to prevent the entry of sperm mitochondria in the embryo. However, the increasing number of instances of paternal mtDNA leakage suggests that these mechanisms are not very effective. The destruction of sperm mitochondria in mammalian embryos is mediated by nuclear factors. Also, the destruction of paternal mitochondria in intraspecific crosses is more effective than in interspecific ones. These observations have led to the hypothesis that leakage of paternal mtDNA (and consequently mtDNA recombination owing to ensuing heteroplasmy) might be more common in inter‐ than in intraspecific crosses and that it should increase with phylogenetic distance of hybridizing species. We checked paternal leakage in inter‐ and intraspecific crosses in Drosophila and found little evidence for this hypothesis. In addition, we have observed a higher level of leakage among male than among female progeny from the same cross. This is the first report of sex‐specific leakage of paternal mtDNA. It suggests that paternal mtDNA leakage might not be a stochastic result of an error‐prone mechanism, but rather, it may be under complex genetic control.
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Published
Jun 19, 2014
Vol/Issue
4(13)
Pages
2633-2641
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Emmanouil Dokianakis, Emmanuel D. Ladoukakis (2014). Different degree of paternal mtDNA leakage between male and female progeny in interspecific Drosophila crosses. Ecology and Evolution, 4(13), 2633-2641. https://doi.org/10.1002/ece3.1069