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A comparison of the association between large haplotype blocks under selection and the presence/absence of inversions
Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA;Harvard Univ, Museum Comparat Zool, Cambridge, MA 02138 USA.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology. Texas A&M Univ, Dept Vet Integrat Biosci, College Stn, TX USA;Swedish Univ Agr Sci, Dept Anim Breeding & Genet, Uppsala, Sweden.
2019 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 9, no 8, p. 4888-4896Article in journal (Refereed) Published
Abstract [en]

Inversions may contribute to ecological adaptation and phenotypic diversity, and with the advent of second and third generation sequencing technologies, the ability to detect inversion polymorphisms has been enhanced dramatically. A key molecular consequence of an inversion is the suppression of recombination allowing independent accumulation of genetic changes between alleles over time. This may lead to the development of divergent haplotype blocks maintained by balancing selection. Thus, divergent haplotype blocks are often considered as indicating the presence of an inversion. In this paper, we first review the features of a 7.7Mb inversion causing the Rose-comb phenotype in chicken, as a model for how inversions evolve and directly affect phenotypes. Second, we compare the genetic basis for alternative mating strategies in ruff and timing of reproduction in Atlantic herring, both associated with divergent haplotype blocks. Alternative male mating strategies in ruff are associated with a 4.5Mb inversion that occurred about 4 million years ago. In fact, the ruff inversion shares some striking features with the Rose-comb inversion such as disruption of a gene at one of the inversion breakpoints and generation of a new allele by recombination between the inverted and noninverted alleles. In contrast, inversions do not appear to be a major reason for the fairly large haplotype blocks (range 10-200kb) associated with ecological adaptation in the herring. Thus, it is important to note that divergent haplotypes may also be maintained by natural selection in the absence of structural variation.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. 9, no 8, p. 4888-4896
Keywords [en]
adaptation, haplotypes, inversion
National Category
Genetics
Identifiers
URN: urn:nbn:se:uu:diva-387565DOI: 10.1002/ece3.5094ISI: 000466104200045PubMedID: 31031951OAI: oai:DiVA.org:uu-387565DiVA, id: diva2:1329508
Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-24Bibliographically approved

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