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  The genomics of incompatibility factors and sex determination in hybridizing species of Cottus (Pisces)

Cheng, J., Czypionka, T., & Nolte, A. W. (2013). The genomics of incompatibility factors and sex determination in hybridizing species of Cottus (Pisces). Heredity, 111(6), 520-529. doi:10.1038/hdy.2013.76.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-5316-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-BC21-7
Genre: Journal Article

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 Creators:
Cheng, J.1, Author              
Czypionka, T.1, Author              
Nolte, A. W.1, Author              
Affiliations:
1Research Group Evolutionary Genetics of Fishes, Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445645              

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Free keywords: scorpaeniformes; postzygotic isolation; reference genome; hybrid speciation; hybrid zone
 Abstract: Cottus rhenanus and Cottus perifretum have formed hybrid lineages and narrow hybrid zones that can be best explained through the action of natural selection. However, the underlying selective forces as well as their genomic targets are not well understood. This study identifies genomic regions in the parental species that cause hybrid incompatibilities and tests whether these manifest in a sex-specific manner to learn about processes that affect natural hybridization in Cottus. Interspecific F2 crosses were analyzed for 255 markers for genetic mapping and to detect transmission distortion as a sign for genetic incompatibilities. The Cottus map consists of 24 linkage groups with a total length of 1575.4 cM. A male heterogametic (XY) sex determination region was found on different linkage groups in the two parental species. Genetic incompatibilities were incomplete, varied among individuals and populations and were not associated with the heterogametic sex. The variance between populations and individuals makes it unlikely that there are species-specific incompatibility loci that could affect the gene pool of natural hybrids in a simple and predictable way. Conserved synteny with sequenced fish genomes permits to genetically study the Cottus genome through the transfer of genomic information from the model fish species. Homology relationships of candidate genomic regions in Cottus indicate that sex determination is not based on the same genomic regions found in other fish species. This suggests a fast evolutionary turnover of the genetic basis of sex determination that, together with the small size of the heterogametic regions, may contribute to the absence of fitness effects related to the Haldane’s rule

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Language(s): eng - English
 Dates: 2013-06-172012-10-232013-07-012013-08-282013-12
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/hdy.2013.76
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Title: Heredity
Source Genre: Journal
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Publ. Info: Macmillan Publishers
Pages: - Volume / Issue: 111 (6) Sequence Number: - Start / End Page: 520 - 529 Identifier: ISSN: 0018-067X (print)
ISSN: 1365-2540 (online)
CoNE: /journals/resource/954925403623