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Extreme variation i...
Extreme variation in recombination rate and genetic diversity along the Sylvioidea neo-sex chromosome
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- Ponnikas, Suvi (författare)
- Lund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science,University of Oulu
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- Sigeman, Hanna (författare)
- Lund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Könsskillnadernas genetik,Forskargrupper vid Lunds universitet,Molekylär ekologi och evolution,Department of Biology,Faculty of Science,Genetics of Sex Differences,Lund University Research Groups,Molecular Ecology and Evolution Lab
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- Lundberg, Max (författare)
- Lund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Molekylär ekologi och evolution,Forskargrupper vid Lunds universitet,CAnMove - Centrum för forskning om djurs spridning och flyttning,Department of Biology,Faculty of Science,Molecular Ecology and Evolution Lab,Lund University Research Groups,CAnMove - Centre for Animal Movement Research
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- Hansson, Bengt (författare)
- Lund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Könsskillnadernas genetik,Forskargrupper vid Lunds universitet,Molekylär ekologi och evolution,CAnMove - Centrum för forskning om djurs spridning och flyttning,Department of Biology,Faculty of Science,Genetics of Sex Differences,Lund University Research Groups,Molecular Ecology and Evolution Lab,CAnMove - Centre for Animal Movement Research
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(creator_code:org_t)
- 2022-06-06
- 2022
- Engelska 18 s.
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Ingår i: Molecular Ecology. - : Wiley. - 0962-1083 .- 1365-294X. ; 31:13, s. 3566-3583
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Recombination strongly impacts sequence evolution by affecting the extent of linkage and the efficiency of selection. Here, we study recombination over the Z chromosome in great reed warblers (Acrocephalus arundinaceus) using pedigree-based linkage mapping. This species has extended Z and W chromosomes (“neo-sex chromosomes”) formed by a fusion between a part of chromosome 4A and the ancestral sex chromosomes, which provides a unique opportunity to assess recombination and sequence evolution in sex-linked regions of different ages. We assembled an 87.54 Mbp and 90.19 cM large Z with a small pseudoautosomal region (0.89 Mbp) at one end and the fused Chr4A-part at the other end of the chromosome. A prominent feature in our data was an extreme variation in male recombination rate along Z with high values at both chromosome ends, but an apparent lack of recombination over a substantial central section, covering 78% of the chromosome. The nonrecombining region showed a drastic loss of genetic diversity and accumulation of repeats compared to the recombining parts. Thus, our data emphasize a key role of recombination in affecting local levels of polymorphism. Nonetheless, the evolutionary rate of genes (dN/dS) did not differ between high and low recombining regions, suggesting that the efficiency of selection on protein-coding sequences can be maintained also at very low levels of recombination. Finally, the Chr4A-derived part showed a similar recombination rate as the part of the ancestral Z that did recombine, but its sequence characteristics reflected both its previous autosomal, and current Z-linked, recombination patterns.
Ämnesord
- NATURVETENSKAP -- Biologi -- Genetik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Genetics (hsv//eng)
Nyckelord
- evolutionary rates
- genetic variation
- great reed warbler
- linkage map
- neo-sex chromosome
- recombination
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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