Islands of speciation or mirages in the desert? Examining the role of restricted recombination in maintaining species.
Over the past decade, many studies documented high genetic divergence between closely related species in genomic regions experiencing restricted recombination in hybrids, such as within chromosomal rearrangements or areas adjacent to centromeres. Such regions have been called 'islands of speciation' because of their presumed role in maintaining the integrity of species despite gene flow elsewhere in the genome. Here, we review alternative explanations for such patterns. Segregation of ancestral variation or artifacts of nucleotide diversity within species can readily lead to higher F(ST) in regions of restricted recombination than other parts of the genome, even in the complete absence of interspecies gene flow, and thereby cause investigators to erroneously conclude that islands of speciation exist. We conclude by discussing strengths and weaknesses of various means for testing the role of restricted recombination in maintaining species.
Duke Scholars
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Related Subject Headings
- Recombination, Genetic
- Genetic Speciation
- Gene Flow
- Evolutionary Biology
- Evolution, Molecular
- Centromere
- Animals
- 3105 Genetics
- 3104 Evolutionary biology
- 0604 Genetics
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Recombination, Genetic
- Genetic Speciation
- Gene Flow
- Evolutionary Biology
- Evolution, Molecular
- Centromere
- Animals
- 3105 Genetics
- 3104 Evolutionary biology
- 0604 Genetics