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Meiotic hybridogenesis in triploid Misgurnus loach derived from a clonal lineage

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Title: Meiotic hybridogenesis in triploid Misgurnus loach derived from a clonal lineage
Other Titles: Hybridogenesis in triploid loach
Authors: Morishima, Kagayaki Browse this author
Yoshikawa, Hiroyuki Browse this author
Arai, Katsutoshi Browse this author →KAKEN DB
Keywords: Misgurnus anguillicaudatus
asexual vertebrates
Issue Date: Jun-2008
Publisher: Nature Publishing Group
Journal Title: Heredity
Volume: 100
Issue: 6
Start Page: 581
End Page: 586
Publisher DOI: 10.1038/hdy.2008.17
PMID: 18382473
Abstract: Triploid loaches Misgurnus anguillicaudatus are derived from unreduced diploid gametes produced by an asexual clonal lineage that normally undergoes gynogenetic reproduction. Here, we have investigated the reproductive system of two types of triploids: the first type carried maternally inherited clonal diploid genomes and a paternally inherited haploid genome from the same population; the second type had the same clonal diploid genomes but a haploid genome from another, genetically divergent population. The germinal vesicles of oocytes from triploid females (3n=75) contained only 25 bivalents, i.e. 50 chromosomes. Flow cytometry revealed that the majority of the progeny resulting from fertilization of eggs from triploid females with normal haploid sperm were diploid. This indicates that triploid females mainly produced haploid eggs. Microsatellite analyses of the diploid progeny of triploid females showed that one allele of the clonal genotype was not transmitted to haploid eggs. Moreover, the identity of the eliminated allele differed between the two types of triploids. Our results demonstrate that there is preferential pairing of homologous chromosomes as well as the elimination of unmatched chromosomes in the course of haploid egg formation, i.e. meiotic hybridogenesis. Two distinct genomes in the clone suggest its hybrid origin.
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 荒井 克俊

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