Transition from sexuality to androgenesis through a meiotic modification during spermatogenesis in freshwater Corbicula clams.

Autor: Etoundi E; Laboratory of Evolutionary Genetics and Ecology, Research Unit in Environmental and Evolutionary Biology, Institute of Life, Earth, and Environment, University of Namur, Namur, Belgium., Vastrade M; Laboratory of Evolutionary Genetics and Ecology, Research Unit in Environmental and Evolutionary Biology, Institute of Life, Earth, and Environment, University of Namur, Namur, Belgium., Berthelin C; Unité Biologie des Organismes et des Ecosytèmes Aquatiques (BOREA, UMR 7208), Université de Caen Normandie, Sorbonne Université, Museum National d'histoire Naturelle, Université Pierre et Marie Curie, CNRS, IRD, Caen, France., Kellner K; Unité Biologie des Organismes et des Ecosytèmes Aquatiques (BOREA, UMR 7208), Université de Caen Normandie, Sorbonne Université, Museum National d'histoire Naturelle, Université Pierre et Marie Curie, CNRS, IRD, Caen, France., Fafin-Lefèvre M; INSERM U1086 'Cancers et Préventions', Centre François Baclesse, Caen, France., Van Doninck K; Laboratory of Evolutionary Genetics and Ecology, Research Unit in Environmental and Evolutionary Biology, Institute of Life, Earth, and Environment, University of Namur, Namur, Belgium.; Université libre de Bruxelles (ULB), Molecular Biology & Evolution, Brussels, Belgium.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Nov 26; Vol. 19 (11), pp. e0313753. Date of Electronic Publication: 2024 Nov 26 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0313753
Abstrakt: Asexual taxa are often considered as rare and vowed to long-term extinction, notably because of their reduced ability for rapid genetic changes and potential adaptation. The rate at which they derive from sexual ancestors and their developmental mode however influence genetic variation in asexual populations. Understanding the transition from sexuality to asexuality is therefore important to infer the evolutionary outcome of asexual taxa. The present work explored the transition from sexuality to androgenesis, a reproductive mode in which the males use female resources to clone themselves, in the freshwater Corbicula clams. Since androgenetic lineages are distinguishable from sexual clams by the production of unreduced sperm, this study investigated the cytological mechanisms underlying spermatogenesis in Corbicula by following the DNA content variation of male germ cells. The widespread androgenetic C. sp. form A/R lineage was compared to the sexual species C. japonica and C. sandai. While in C. japonica, the last stages of spermatogenesis are reduced through a canonical meiosis process, no reduced or duplicated stages were observed in C. sp. form A/R, suggesting a meiosis modification in this lineage. However, 45% of C. sandai spermatozoa were unreduced. The production of unreduced sperm may condition or provide the potential for the emergence of androgenesis in this sexual species. Being closely related to androgenetic lineages and found in sympatry with them in Lake Biwa (Japan), C. sandai might be an origin of androgenetic lineage emergence, or even an origin of the androgenetic reproductive mode in Corbicula.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Etoundi et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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