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Citation 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).

Citation

Yamamoto K., Hamaji T., Kawai-toyooka H., Matsuzaki R., Takahashi F., Nishimura Y., Kawachi M., Noguchi H., Minakuchi Y., Umen J., Toyoda A., & Nozaki H. 2020. Three genomes in the algal genus Volvox reveal the fate of a haploid sex-determining region after a transition to homothallism. Proceedings of the National Academy of Sciences, U.S.A., .

Authors

• Yamamoto K. (submitter) 089012576857
• Hamaji T.
• Kawai-toyooka H.
• Matsuzaki R. +81-29-850-2204
• Takahashi F.
• Nishimura Y.
• Kawachi M.
• Noguchi H.
• Minakuchi Y.
• Umen J.
• Toyoda A.
• Nozaki H.

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.

Keywords

Volvox, MT, homothallism

External links

• DOI: 10.1073/pnas.2100712118

About this resource

• Canonical resource URI: http://purl.org/phylo/treebase/phylows/study/TB2:S26767
• Other versions: Nexus NeXML
• Show BibTeX reference

  		@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.}
  }
  		

• Show RIS reference

  		TY  - JOUR
  ID  - 31142
  AU  - Yamamoto,Kayoko 
  AU  -  Hamaji,Takashi 
  AU  - Kawai-Toyooka,Hiroko 
  AU  - Matsuzaki,Ryo 
  AU  - Takahashi,Fumio 
  AU  - Nishimura,Yoshiki 
  AU  - Kawachi,Masanobu 
  AU  - Noguchi,Hideki 
  AU  - Minakuchi,Yohei 
  AU  - Umen,James 
  AU  - Toyoda,Atsushi 
  AU  - Nozaki,Hisayoshi 
  T1  - Three genomes in the algal genus Volvox reveal the fate of a haploid sex-determining region after a transition to homothallism
  PY  - 2020
  KW  - Volvox
  KW  - MT
  KW  - homothallism
  UR  - 
  N2  - 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.
  L3  - 10.1073/pnas.2100712118
  JF  - Proceedings of the National Academy of Sciences, U.S.A.
  VL  - 
  IS  - 
  ER  -