Genomic signatures of recombination in a natural population of the bdelloid rotifer Adineta vaga

Olga A. Vakhrusheva, Elena A. Mnatsakanova, Yan R. Galimov, Tatiana V. Neretina, Evgeny S. Gerasimov, Sergey A. Naumenko, Svetlana G. Ozerova, Arthur O. Zalevsky, Irina A. Yushenova, Fernando Rodriguez, Irina R. Arkhipova, Aleksey A. Penin, Maria D. Logacheva, Georgii A. Bazykin, Alexey S. Kondrashov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Sexual reproduction is almost ubiquitous among extant eukaryotes. As most asexual lineages are short-lived, abandoning sex is commonly regarded as an evolutionary dead end. Still, putative anciently asexual lineages challenge this view. One of the most striking examples are bdelloid rotifers, microscopic freshwater invertebrates believed to have completely abandoned sexual reproduction tens of Myr ago. Here, we compare whole genomes of 11 wild-caught individuals of the bdelloid rotifer Adineta vaga and present evidence that some patterns in its genetic variation are incompatible with strict clonality and lack of genetic exchange. These patterns include genotype proportions close to Hardy-Weinberg expectations within loci, lack of linkage disequilibrium between distant loci, incongruent haplotype phylogenies across the genome, and evidence for hybridization between divergent lineages. Analysis of triallelic sites independently corroborates these findings. Our results provide evidence for interindividual genetic exchange and recombination in A. vaga, a species previously thought to be anciently asexual.

Original languageEnglish
Article number6421
JournalNature Communications
Volume11
Issue number1
DOIs
Publication statusPublished - Dec 2020

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