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Extreme variation i...
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Ponnikas, SuviLund University,Lunds universitet,MEMEG,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science,University of Oulu
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Extreme variation in recombination rate and genetic diversity along the Sylvioidea neo-sex chromosome
- Artikel/kapitelEngelska2022
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2022-06-06
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Wiley,2022
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18 s.
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LIBRIS-ID:oai:lup.lub.lu.se:6c67066c-22a9-4987-910d-21a0f79e6192
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https://lup.lub.lu.se/record/6c67066c-22a9-4987-910d-21a0f79e6192URI
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https://doi.org/10.1111/mec.16532DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Sigeman, HannaLund 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(Swepub:lu)ha4515si
(författare)
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Lundberg, MaxLund 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(Swepub:lu)zooe-mld
(författare)
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Hansson, BengtLund 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(Swepub:lu)ekol-bhn
(författare)
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MEMEGBiologiska institutionen
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Molecular Ecology: Wiley31:13, s. 3566-35830962-10831365-294X
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