Simultaneous Mendelian and clonal genome transmission in a sexually reproducing, all-triploid vertebrate.

Details

Serval ID
serval:BIB_B6200D20B5A5
Type
Article: article from journal or magazin.
Collection
Publications
Title
Simultaneous Mendelian and clonal genome transmission in a sexually reproducing, all-triploid vertebrate.
Journal
Proceedings of the Royal Society B Biological Sciences
Author(s)
Stöck M., Ustinova J., Betto-Colliard C., Schartl M., Moritz C., Perrin N.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Publication state
Published
Issued date
2012
Volume
279
Number
1732
Pages
1293-1299
Language
english
Abstract
Meiosis in triploids faces the seemingly insuperable difficulty of dividing an odd number of chromosome sets by two. Triploid vertebrates usually circumvent this problem through either asexuality or some forms of hybridogenesis, including meiotic hybridogenesis that involve a reproductive community of different ploidy levels and genome composition. Batura toads (Bufo baturae; 3n = 33 chromosomes), however, present an all-triploid sexual reproduction. This hybrid species has two genome copies carrying a nucleolus-organizing region (NOR+) on chromosome 6, and a third copy without it (NOR-). Males only produce haploid NOR+ sperm, while ova are diploid, containing one NOR+ and one NOR- set. Here, we conduct sibship analyses with co-dominant microsatellite markers so as (i) to confirm the purely clonal and maternal transmission of the NOR- set, and (ii) to demonstrate Mendelian segregation and recombination of the NOR+ sets in both sexes. This new reproductive mode in vertebrates ('pre-equalizing hybrid meiosis') offers an ideal opportunity to study the evolution of non-recombining genomes. Elucidating the mechanisms that allow simultaneous transmission of two genomes, one of Mendelian, the other of clonal inheritance, might shed light on the general processes that regulate meiosis in vertebrates.
Keywords
biased genome transmission, clonal, Mendelian segregation, recombination, triploid vertebrate, Bufo viridis subgroup
Pubmed
Web of science
Open Access
Yes
Create date
20/09/2011 14:22
Last modification date
20/08/2019 16:24
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