How did the guppy Y chromosome evolve?

The sex chromosome pairs of many species do not undergo genetic recombination, unlike the autosomes. It has been proposed that the suppressed recombination results from natural selection favouring close linkage between sex-determining genes and mutations on this chromosome with advantages in one sex...

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Autores principales:	Deborah Charlesworth, Roberta Bergero, Chay Graham, Jim Gardner, Karen Keegan
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Genetics QH426-470
Acceso en línea:	https://doaj.org/article/a74fb9b179da4bfcab739dafbc4ced14
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spelling	oai:doaj.org-article:a74fb9b179da4bfcab739dafbc4ced142021-12-02T20:03:24ZHow did the guppy Y chromosome evolve?1553-73901553-740410.1371/journal.pgen.1009704https://doaj.org/article/a74fb9b179da4bfcab739dafbc4ced142021-08-01T00:00:00Zhttps://doi.org/10.1371/journal.pgen.1009704https://doaj.org/toc/1553-7390https://doaj.org/toc/1553-7404The sex chromosome pairs of many species do not undergo genetic recombination, unlike the autosomes. It has been proposed that the suppressed recombination results from natural selection favouring close linkage between sex-determining genes and mutations on this chromosome with advantages in one sex, but disadvantages in the other (these are called sexually antagonistic mutations). No example of such selection leading to suppressed recombination has been described, but populations of the guppy display sexually antagonistic mutations (affecting male coloration), and would be expected to evolve suppressed recombination. In extant close relatives of the guppy, the Y chromosomes have suppressed recombination, and have lost all the genes present on the X (this is called genetic degeneration). However, the guppy Y occasionally recombines with its X, despite carrying sexually antagonistic mutations. We describe evidence that a new Y evolved recently in the guppy, from an X chromosome like that in these relatives, replacing the old, degenerated Y, and explaining why the guppy pair still recombine. The male coloration factors probably arose after the new Y evolved, and have already evolved expression that is confined to males, a different way to avoid the conflict between the sexes.Deborah CharlesworthRoberta BergeroChay GrahamJim GardnerKaren KeeganPublic Library of Science (PLoS)articleGeneticsQH426-470ENPLoS Genetics, Vol 17, Iss 8, p e1009704 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Genetics QH426-470
spellingShingle	Genetics QH426-470 Deborah Charlesworth Roberta Bergero Chay Graham Jim Gardner Karen Keegan How did the guppy Y chromosome evolve?
description	The sex chromosome pairs of many species do not undergo genetic recombination, unlike the autosomes. It has been proposed that the suppressed recombination results from natural selection favouring close linkage between sex-determining genes and mutations on this chromosome with advantages in one sex, but disadvantages in the other (these are called sexually antagonistic mutations). No example of such selection leading to suppressed recombination has been described, but populations of the guppy display sexually antagonistic mutations (affecting male coloration), and would be expected to evolve suppressed recombination. In extant close relatives of the guppy, the Y chromosomes have suppressed recombination, and have lost all the genes present on the X (this is called genetic degeneration). However, the guppy Y occasionally recombines with its X, despite carrying sexually antagonistic mutations. We describe evidence that a new Y evolved recently in the guppy, from an X chromosome like that in these relatives, replacing the old, degenerated Y, and explaining why the guppy pair still recombine. The male coloration factors probably arose after the new Y evolved, and have already evolved expression that is confined to males, a different way to avoid the conflict between the sexes.
format	article
author	Deborah Charlesworth Roberta Bergero Chay Graham Jim Gardner Karen Keegan
author_facet	Deborah Charlesworth Roberta Bergero Chay Graham Jim Gardner Karen Keegan
author_sort	Deborah Charlesworth
title	How did the guppy Y chromosome evolve?
title_short	How did the guppy Y chromosome evolve?
title_full	How did the guppy Y chromosome evolve?
title_fullStr	How did the guppy Y chromosome evolve?
title_full_unstemmed	How did the guppy Y chromosome evolve?
title_sort	how did the guppy y chromosome evolve?
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/a74fb9b179da4bfcab739dafbc4ced14
work_keys_str_mv	AT deborahcharlesworth howdidtheguppyychromosomeevolve AT robertabergero howdidtheguppyychromosomeevolve AT chaygraham howdidtheguppyychromosomeevolve AT jimgardner howdidtheguppyychromosomeevolve AT karenkeegan howdidtheguppyychromosomeevolve
_version_	1718375676926492672

How did the guppy Y chromosome evolve?

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