Contrasting Evolutionary Patterns Between Sexual and Asexual Lineages in a Genomic Region Linked to Reproductive Mode Variation in the pea aphid.

Autor:	Rimbault M; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Legeai F; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France.; University of Rennes, Inria, CNRS, IRISA, Rennes, France., Peccoud J; Laboratoire Ecologie et Biologie des Interactions, Equipe Ecologie Evolution Symbiose, Unité Mixte de Recherche 7267 Centre National de la Recherche Scientifique, Université de Poitiers, Poitiers CEDEX 9, France., Mieuzet L; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Call E; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Nouhaud P; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France.; CBGP, INRAE, CIRAD, IRD, Montpellier SupAgro, Univ Montpellier, Montpellier, France., Defendini H; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Mahéo F; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Marande W; French Plant Genomic Resource Center, INRAE-CNRGV, Castanet Tolosan, France., Théron N; French Plant Genomic Resource Center, INRAE-CNRGV, Castanet Tolosan, France., Tagu D; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Le Trionnaire G; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Simon JC; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France., Jaquiéry J; INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France.
Jazyk:	angličtina
Zdroj:	Genome biology and evolution [Genome Biol Evol] 2023 Sep 04; Vol. 15 (9).
DOI:	10.1093/gbe/evad168
Abstrakt:	Although asexual lineages evolved from sexual lineages in many different taxa, the genetics of sex loss remains poorly understood. We addressed this issue in the pea aphid Acyrthosiphon pisum, whose natural populations encompass lineages performing cyclical parthenogenesis (CP) and producing one sexual generation per year, as well as obligate parthenogenetic (OP) lineages that can no longer produce sexual females but can still produce males. An SNP-based, whole-genome scan of CP and OP populations sequenced in pools (103 individuals from 6 populations) revealed that an X-linked region is associated with the variation in reproductive mode. This 840-kb region is highly divergent between CP and OP populations (FST = 34.9%), with >2,000 SNPs or short Indels showing a high degree of association with the phenotypic trait. In OP populations specifically, this region also shows reduced diversity and Tajima's D, consistent with the OP phenotype being a derived trait in aphids. Interestingly, the low genetic differentiation between CP and OP populations at the rest of the genome (FST = 2.5%) suggests gene flow between them. Males from OP lineages thus likely transmit their op allele to new genomic backgrounds. These genetic exchanges, combined with the selection of the OP and CP reproductive modes under different climates, probably contribute to the long-term persistence of the cp and op alleles. (© The Author(s) 2023. Published by Oxford University Press on behalf of Society for Molecular Biology and Evolution.)
Databáze:	MEDLINE
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