What was the ancestral sex-determining mechanism in amniote vertebrates?

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985904%3A_____%2F16%3A00461264" target="_blank" >RIV/67985904:_____/16:00461264 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/16:10325418

Result on the web

<a href="http://dx.doi.org/10.1111/brv.12156" target="_blank" >http://dx.doi.org/10.1111/brv.12156</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/brv.12156" target="_blank" >10.1111/brv.12156</a>

Result language

angličtina

Original language name

What was the ancestral sex-determining mechanism in amniote vertebrates?

Original language description

Amniote vertebrates, the group consisting of mammals and reptiles including birds, possess various mechanisms of sex determination. Under environmental sex determination (ESD), the sex of individuals depends on the environmental conditions occurring during their development and therefore there are no sexual differences present in their genotypes. Alternatively, through the mode of genotypic sex determination (GSD), sex is determined by a sex-specific genotype, i.e. by the combination of sex chromosomes at various stages of differentiation at conception. As well as influencing sex determination, sex-specific parts of genomes may, and often do, develop specific reproductive or ecological roles in their bearers. Accordingly, an individual with a mismatch between phenotypic (gonadal) and genotypic sex, for example an individual sex-reversed by environmental effects, should have a lower fitness due to the lack of specialized, sex-specific parts of their genome. In this case, evolutionary transitions from GSD to ESD should be less likely than transitions in the opposite direction. This prediction contrasts with the view that GSD was the ancestral sex-determining mechanism for amniote vertebrates. Ancestral GSD would require several transitions from GSD to ESD associated with an independent dedifferentiation of sex chromosomes, at least in the ancestors of crocodiles, turtles, and lepidosaurs (tuataras and squamate reptiles). In this review, we argue that the alternative theory postulating ESD as ancestral in amniotes is more parsimonious and is largely concordant with the theoretical expectations and current knowledge of the phylogenetic distribution and homology of sex-determining mechanisms.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

EG - Zoology

OECD FORD branch

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Project

<a href="/en/project/GAP506%2F10%2F0718" target="_blank" >GAP506/10/0718: Evolution of sex determining systems in squamate reptiles: molecular cytogenetic test of multiple independent origins of sex chromosomes</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Biological Reviews

ISSN

1464-7931

e-ISSN

—

Volume of the periodical

91

Issue of the periodical within the volume

1

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

1-12

UT code for WoS article

000367985200001

EID of the result in the Scopus database

2-s2.0-84953735051