Haplotype divergence supports long-term asexuality in the oribatid mite Oppiella nova.

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License: CC BY 4.0
Serval ID
serval:BIB_A92AB05DA145
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Haplotype divergence supports long-term asexuality in the oribatid mite Oppiella nova.
Journal
Proceedings of the National Academy of Sciences of the United States of America
Author(s)
Brandt A., Tran Van P., Bluhm C., Anselmetti Y., Dumas Z., Figuet E., François C.M., Galtier N., Heimburger B., Jaron K.S., Labédan M., Maraun M., Parker D.J., Robinson-Rechavi M., Schaefer I., Simion P., Scheu S., Schwander T., Bast J.
ISSN
1091-6490 (Electronic)
ISSN-L
0027-8424
Publication state
Published
Issued date
21/09/2021
Peer-reviewed
Oui
Volume
118
Number
38
Pages
e2101485118
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Sex strongly impacts genome evolution via recombination and segregation. In the absence of these processes, haplotypes within lineages of diploid organisms are predicted to accumulate mutations independently of each other and diverge over time. This so-called "Meselson effect" is regarded as a strong indicator of the long-term evolution under obligate asexuality. Here, we present genomic and transcriptomic data of three populations of the asexual oribatid mite species Oppiella nova and its sexual relative Oppiella subpectinata We document strikingly different patterns of haplotype divergence between the two species, strongly supporting Meselson effect-like evolution and long-term asexuality in O. nova: I) variation within individuals exceeds variation between populations in O. nova but vice versa in O. subpectinata; II) two O. nova sublineages feature a high proportion of lineage-specific heterozygous single-nucleotide polymorphisms (SNPs), indicating that haplotypes continued to diverge after lineage separation; III) the deepest split in gene trees generally separates the two haplotypes in O. nova, but populations in O. subpectinata; and IV) the topologies of the two haplotype trees match each other. Our findings provide positive evidence for the absence of canonical sex over evolutionary time in O. nova and suggest that asexual oribatid mites can escape the dead-end fate usually associated with asexual lineages.
Keywords
Multidisciplinary, Meselson effect, asexuality, haplotype divergence, oribatid mites
Pubmed
Open Access
Yes
Funding(s)
Swiss National Science Foundation / CRSII3_160723
Swiss National Science Foundation / PP00P3_170627
Create date
21/09/2021 11:40
Last modification date
28/09/2021 6:57
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