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Evolution of hybrid...
Evolution of hybrid inviability associated with chromosome fusions
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- Boman, Jesper (författare)
- Uppsala universitet,Evolutionsbiologi
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- Näsvall, Karin (författare)
- Uppsala universitet,Evolutionsbiologi
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- Vila, Roger (författare)
- Institut de Biologia Evolutiva (CSIC-Univ. Pompeu Fabra), Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Spain
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visa fler...
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- Wiklund, Christer (författare)
- Department of Zoology: Division of Ecology, Stockholm University, Stockholm, Sweden
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- Backström, Niclas, 1969- (författare)
- Uppsala universitet,Evolutionsbiologi
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visa färre...
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(creator_code:org_t)
- Engelska.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- Chromosomal rearrangements, such as inversions, have received considerable attention in the speciation literature due to their hampering effects on recombination. However, less is known about how other rearrangements, such as chromosome fissions and fusions, can affect the evolution of reproductive isolation. Here, we used crosses between populations of the wood white butterfly (Leptidea sinapis) with different karyotypes to identify genomic regions associated with hybrid inviability. We mapped candidate loci for hybrid inviability by contrasting allele frequencies between F2 hybrids that survived until the adult stage with individuals of the same cohort that succumbed to hybrid incompatibilities. Hybrid inviability factors were predominantly found in fast-evolving regions with reduced recombination rates, especially in regions where chromosome fusions have occurred. By analyzing sequencing coverage, we excluded aneuploidies as a direct link between hybrid inviability and chromosome fusions. Instead, our results point to an indirect relationship between hybrid inviability and chromosome fusions, possibly related to reductions in recombination rate caused by fusions. These results highlight that the extensive variation in chromosome numbers observed across the tree of life does not only distinguish species but can also be involved in speciation by being hotspots for the early evolution of postzygotic reproductive isolation.
Ämnesord
- NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)
Nyckelord
- Speciation
- Hybrid inviability
- Hybrid incompatibilities
- Chromosomal rearrangements
- Population genomics
Publikations- och innehållstyp
- vet (ämneskategori)
- ovr (ämneskategori)