Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

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

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.
Type de document :
Article dans une revue
Liste complète des métadonnées
Contributeur : Christine Bibal Connectez-vous pour contacter le contributeur
Soumis le : lundi 20 septembre 2021 - 10:33:06
Dernière modification le : mardi 31 mai 2022 - 10:20:18
Archivage à long terme le : : mardi 21 décembre 2021 - 18:30:01


Publication financée par une institution


Distributed under a Creative Commons Paternité 4.0 International License



Alexander Brandt, Patrick Tran Van, Christian Bluhm, yoann Anselmetti, Zoé Dumas, et al.. Haplotype divergence supports long-term asexuality in the oribatid mite Oppiella nova. Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 2021, 118 (38), pp.e2101485118. ⟨10.1073/pnas.2101485118⟩. ⟨hal-03348950⟩



Consultations de la notice


Téléchargements de fichiers