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Postcopulatory sexual selection reduces Z-linked genetic variation and might contribute to the large Z effect in passerine birds
V. Janoušek, J. Fischerová, L. Mořkovský, J. Reif, M. Antczak, T. Albrecht, R. Reifová,
Language English Country Great Britain
Document type Journal Article, Research Support, Non-U.S. Gov't
Grant support
15-10884Y, 18-14325S
Grantová Agentura České Republiky (Grant Agency of the Czech Republic) - International
PRIMUS/19/SCI/08
Univerzita Karlova v Praze (Charles University) - International
NLK
Free Medical Journals
from 2011
PubMed Central
from 2011 to 1 year ago
Europe PubMed Central
from 2011 to 1 year ago
ProQuest Central
from 2000-01-01 to 1 year ago
Open Access Digital Library
from 1947-01-01
Health & Medicine (ProQuest)
from 2000-01-01 to 1 year ago
Public Health Database (ProQuest)
from 2000-01-01 to 1 year ago
- MeSH
- Species Specificity MeSH
- Genetic Variation MeSH
- Genetic Drift MeSH
- Evolution, Molecular MeSH
- Sex Chromosomes genetics MeSH
- Mating Preference, Animal * MeSH
- Spermatozoa cytology MeSH
- Gene Flow MeSH
- Genetic Speciation MeSH
- Songbirds genetics physiology MeSH
- Animals MeSH
- Check Tag
- Male MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
The X and Z sex chromosomes play a disproportionately large role in intrinsic postzygotic isolation. The underlying mechanisms of this large X/Z effect are, however, still poorly understood. Here we tested whether faster rates of molecular evolution caused by more intense positive selection or genetic drift on the Z chromosome could contribute to the large Z effect in two closely related passerine birds, the Common Nightingale (Luscinia megarhynchos) and the Thrush Nightingale (L. luscinia). We found that the two species differ in patterns of molecular evolution on the Z chromosome. The Z chromosome of L. megarhynchos showed lower levels of within-species polymorphism and an excess of non-synonymous polymorphisms relative to non-synonymous substitutions. This is consistent with increased levels of genetic drift on this chromosome and may be attributed to more intense postcopulatory sexual selection acting on L. megarhynchos males as was indicated by significantly longer sperm and higher between-male variation in sperm length in L. megarhynchos compared to L. luscinia. Interestingly, analysis of interspecific gene flow on the Z chromosome revealed relatively lower levels of introgression from L. megarhynchos to L. luscinia than vice versa, indicating that the Z chromosome of L. megarhynchos accumulated more hybrid incompatibilities. Our results are consistent with the view that postcopulatory sexual selection may reduce the effective population size of the Z chromosome and thus lead to stronger genetic drift on this chromosome in birds. This can result in relatively faster accumulation of hybrid incompatibilities on the Z and thus contribute to the large Z effect.
Department of Behavioural Ecology Adam Mickiewicz University Umultowska 89 Poznań 61 614 Poland
Department of Zoology Faculty of Science Charles University Viničná 7 Prague 2 128 00 Czech Republic
References provided by Crossref.org
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- $a Postcopulatory sexual selection reduces Z-linked genetic variation and might contribute to the large Z effect in passerine birds / $c V. Janoušek, J. Fischerová, L. Mořkovský, J. Reif, M. Antczak, T. Albrecht, R. Reifová,
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- $a The X and Z sex chromosomes play a disproportionately large role in intrinsic postzygotic isolation. The underlying mechanisms of this large X/Z effect are, however, still poorly understood. Here we tested whether faster rates of molecular evolution caused by more intense positive selection or genetic drift on the Z chromosome could contribute to the large Z effect in two closely related passerine birds, the Common Nightingale (Luscinia megarhynchos) and the Thrush Nightingale (L. luscinia). We found that the two species differ in patterns of molecular evolution on the Z chromosome. The Z chromosome of L. megarhynchos showed lower levels of within-species polymorphism and an excess of non-synonymous polymorphisms relative to non-synonymous substitutions. This is consistent with increased levels of genetic drift on this chromosome and may be attributed to more intense postcopulatory sexual selection acting on L. megarhynchos males as was indicated by significantly longer sperm and higher between-male variation in sperm length in L. megarhynchos compared to L. luscinia. Interestingly, analysis of interspecific gene flow on the Z chromosome revealed relatively lower levels of introgression from L. megarhynchos to L. luscinia than vice versa, indicating that the Z chromosome of L. megarhynchos accumulated more hybrid incompatibilities. Our results are consistent with the view that postcopulatory sexual selection may reduce the effective population size of the Z chromosome and thus lead to stronger genetic drift on this chromosome in birds. This can result in relatively faster accumulation of hybrid incompatibilities on the Z and thus contribute to the large Z effect.
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