Low mitochondrial variability in birds may indicate Hill-Robertson effects on the W chromosome
2007 (English)In: Heredity, ISSN 0018-067X, E-ISSN 1365-2540, Vol. 99, no 4, 389-396 p.Article in journal (Refereed) Published
Interference among loci subject to selection ( the Hill Robertson effect) may considerably reduce levels of adaptation and variability in genomic regions that lack recombination. Y- or W chromosomes are particularly vulnerable to such effects, since they represent large, non-recombining blocks of genetic material. In birds, the W chromosome and mitochondrial genomes are both maternally transmitted, and hence fail to recombine with each other, whereas in mammals the Y chromosome is paternally transmitted. We show here that mitochondrial DNA sequence diversity is reduced in non-ratite birds compared with mammals. After considering possible confounding factors, such as differences in generation times, mutation rates and demography, we conclude that Hill-Robertson effects associated with the W chromosome provide the most likely explanation for this difference.
Place, publisher, year, edition, pages
2007. Vol. 99, no 4, 389-396 p.
W chromosomes, mitochondria, Hill-Robertson effects, birds, mammals
IdentifiersURN: urn:nbn:se:uu:diva-143363DOI: 10.1038/sj.hdy.6801014ISI: 000249720900007OAI: oai:DiVA.org:uu-143363DiVA: diva2:390226