@ARTICLE{TreeBASE2Ref31142,
author = {Kayoko Yamamoto and Takashi Hamaji and Hiroko Kawai-Toyooka and Ryo Matsuzaki and Fumio Takahashi and Yoshiki Nishimura and Masanobu Kawachi and Hideki Noguchi and Yohei Minakuchi and James Umen and Atsushi Toyoda and Hisayoshi Nozaki},
title = {Three genomes in the algal genus Volvox reveal the fate of a haploid sex-determining region after a transition to homothallism},
year = {2020},
keywords = {Volvox, MT, homothallism},
doi = {10.1073/pnas.2100712118},
url = {},
pmid = {},
journal = {Proceedings of the National Academy of Sciences, U.S.A.},
volume = {},
number = {},
pages = {},
abstract = {Transitions between separate sexes (dioecy) and other mating
systems are common across eukaryotes. Here, we study a change
in a haploid dioecious green algal species with male- and femaledetermining
chromosomes (U and V). The genus Volvox is an oogamous
(with large, immotile female gametes and small, motile
male gametes) and includes both heterothallic species (with distinct
male and female genotypes, associated with a mating-type
system that prevents fusion of gametes of the same sex) and homothallic
species (bisexual, with the ability to self-fertilize). We
date the origin of an expanded sex-determining region (SDR) in
Volvox to at least 75 Mya, suggesting that homothallism represents
a breakdown of dioecy (heterothallism). We investigated the
involvement of the SDR of the U and V chromosomes in this transition.
Using de novo whole-genome sequences, we identified a
heteromorphic SDR of ca 1 Mbp in male and female genotypes of
the heterothallic species Volvox reticuliferus and a homologous
region (SDLR) in the closely related homothallic species Volvox
africanus, which retained several different hallmark features of
an SDR. The V. africanus SDLR includes a large region resembling
the female SDR of the presumptive heterothallic ancestor,
whereas most genes from the male SDR are absent. However,
we found a multicopy array of the male-determining gene, MID, in a different genomic location from the SDLR. Thus, in V. africanus, an ancestrally female genotype may have acquired MID and
thereby gained male traits.}
}
Trees for Study 26767
Citation title:
"Three genomes in the algal genus Volvox reveal the fate of a haploid sex-determining region after a transition to homothallism".
Study name:
"Three genomes in the algal genus Volvox reveal the fate of a haploid sex-determining region after a transition to homothallism".
This study is part of submission 26767
(Status: Published).
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