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CHROMOSOME NUMBER AND SEX DETERMINATION COEVOLVE IN TURTLES

Although much progress has been achieved in understanding the genetic basis of adaptation, the drivers of genome evolution remain obscure. For instance, extensive variation among reptilian genomes continues largely unexplained, yet reptiles hold critical clues about vertebrate evolution. Turtles pos... Full description

Journal Title: Evolution 2011-06, Vol.65 (6), p.1808-1813
Main Author: Valenzuela, Nicole
Other Authors: Adams, Dean C.
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Malden, USA: Blackwell Publishing Inc
ID: ISSN: 0014-3820
Link: https://www.ncbi.nlm.nih.gov/pubmed/21644965
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recordid: cdi_proquest_miscellaneous_871003683
title: CHROMOSOME NUMBER AND SEX DETERMINATION COEVOLVE IN TURTLES
format: Article
creator:
  • Valenzuela, Nicole
  • Adams, Dean C.
subjects:
  • Animals
  • BRIEF COMMUNICATIONS
  • Chromosomes
  • Climate change
  • diploid number
  • Diploidy
  • Environmental aspects
  • Evolution
  • evolution of genome compartmentalization
  • Evolution, Molecular
  • Evolutionary biology
  • Gene Expression Regulation
  • Genetic aspects
  • Genomes
  • Genomics
  • Genotype & phenotype
  • Karyotyping
  • Phylogeny
  • Physiological aspects
  • Ploidies
  • Reptiles & amphibians
  • reptilian vertebrates
  • Sex chromosomes
  • Sex determination
  • Sex Determination Processes
  • Sex determination, Genetic
  • sexual development
  • Temperature
  • temperature-dependent and genotypic sex determination
  • Turtles
  • Turtles - genetics
  • Vertebrates
ispartof: Evolution, 2011-06, Vol.65 (6), p.1808-1813
description: Although much progress has been achieved in understanding the genetic basis of adaptation, the drivers of genome evolution remain obscure. For instance, extensive variation among reptilian genomes continues largely unexplained, yet reptiles hold critical clues about vertebrate evolution. Turtles posses diverse chromosome numbers (2N = 28-66) derived from extensive genomic rearrangements, plus varied sex-determining mechanisms (genotypic and temperature-dependent). Here, we show that rates of evolution in turtle chromosome number are ~20-fold higher along phylogenetic branches where transitions between sexdetermining mechanisms also occur, revealing a strong coevolution of these traits and making drift a less likely driver. Directional tests indicate that both traits evolved effectively in synchrony. These events occurred near global extremes in temperature shifts over the last 200 million years, although the role of climate change remains unknown at this point. Two alternative testable explanations for these patterns are proposed. First, selection for sex determination turnover may co-opt mechanisms (e.g., chromatin remodeling) favoring genomic rearrangements. Alternatively, chromosomal rearrangements underlying diploid number evolution may alter gene regulation enabling transitions in sex-determining mechanisms. Our data indicate that the evolution of sex determination is intimately linked to profound genomic changes underlying diploid number evolution, the ecological context of which remains intriguing.
language: eng
source:
identifier: ISSN: 0014-3820
fulltext: no_fulltext
issn:
  • 0014-3820
  • 1558-5646
url: Link


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descriptionAlthough much progress has been achieved in understanding the genetic basis of adaptation, the drivers of genome evolution remain obscure. For instance, extensive variation among reptilian genomes continues largely unexplained, yet reptiles hold critical clues about vertebrate evolution. Turtles posses diverse chromosome numbers (2N = 28-66) derived from extensive genomic rearrangements, plus varied sex-determining mechanisms (genotypic and temperature-dependent). Here, we show that rates of evolution in turtle chromosome number are ~20-fold higher along phylogenetic branches where transitions between sexdetermining mechanisms also occur, revealing a strong coevolution of these traits and making drift a less likely driver. Directional tests indicate that both traits evolved effectively in synchrony. These events occurred near global extremes in temperature shifts over the last 200 million years, although the role of climate change remains unknown at this point. Two alternative testable explanations for these patterns are proposed. First, selection for sex determination turnover may co-opt mechanisms (e.g., chromatin remodeling) favoring genomic rearrangements. Alternatively, chromosomal rearrangements underlying diploid number evolution may alter gene regulation enabling transitions in sex-determining mechanisms. Our data indicate that the evolution of sex determination is intimately linked to profound genomic changes underlying diploid number evolution, the ecological context of which remains intriguing.
editionReceived December 1, 2010, Accepted January 24, 2011
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languageeng
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subjectAnimals ; BRIEF COMMUNICATIONS ; Chromosomes ; Climate change ; diploid number ; Diploidy ; Environmental aspects ; Evolution ; evolution of genome compartmentalization ; Evolution, Molecular ; Evolutionary biology ; Gene Expression Regulation ; Genetic aspects ; Genomes ; Genomics ; Genotype & phenotype ; Karyotyping ; Phylogeny ; Physiological aspects ; Ploidies ; Reptiles & amphibians ; reptilian vertebrates ; Sex chromosomes ; Sex determination ; Sex Determination Processes ; Sex determination, Genetic ; sexual development ; Temperature ; temperature-dependent and genotypic sex determination ; Turtles ; Turtles - genetics ; Vertebrates
ispartofEvolution, 2011-06, Vol.65 (6), p.1808-1813
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0Copyright © 2011 Society for the Study of Evolution
12011 The Author(s). © 2011 The Society for the Study of Evolution.
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descriptionAlthough much progress has been achieved in understanding the genetic basis of adaptation, the drivers of genome evolution remain obscure. For instance, extensive variation among reptilian genomes continues largely unexplained, yet reptiles hold critical clues about vertebrate evolution. Turtles posses diverse chromosome numbers (2N = 28-66) derived from extensive genomic rearrangements, plus varied sex-determining mechanisms (genotypic and temperature-dependent). Here, we show that rates of evolution in turtle chromosome number are ~20-fold higher along phylogenetic branches where transitions between sexdetermining mechanisms also occur, revealing a strong coevolution of these traits and making drift a less likely driver. Directional tests indicate that both traits evolved effectively in synchrony. These events occurred near global extremes in temperature shifts over the last 200 million years, although the role of climate change remains unknown at this point. Two alternative testable explanations for these patterns are proposed. First, selection for sex determination turnover may co-opt mechanisms (e.g., chromatin remodeling) favoring genomic rearrangements. Alternatively, chromosomal rearrangements underlying diploid number evolution may alter gene regulation enabling transitions in sex-determining mechanisms. Our data indicate that the evolution of sex determination is intimately linked to profound genomic changes underlying diploid number evolution, the ecological context of which remains intriguing.
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13Genomes
14Genomics
15Genotype & phenotype
16Karyotyping
17Phylogeny
18Physiological aspects
19Ploidies
20Reptiles & amphibians
21reptilian vertebrates
22Sex chromosomes
23Sex determination
24Sex Determination Processes
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abstractAlthough much progress has been achieved in understanding the genetic basis of adaptation, the drivers of genome evolution remain obscure. For instance, extensive variation among reptilian genomes continues largely unexplained, yet reptiles hold critical clues about vertebrate evolution. Turtles posses diverse chromosome numbers (2N = 28-66) derived from extensive genomic rearrangements, plus varied sex-determining mechanisms (genotypic and temperature-dependent). Here, we show that rates of evolution in turtle chromosome number are ~20-fold higher along phylogenetic branches where transitions between sexdetermining mechanisms also occur, revealing a strong coevolution of these traits and making drift a less likely driver. Directional tests indicate that both traits evolved effectively in synchrony. These events occurred near global extremes in temperature shifts over the last 200 million years, although the role of climate change remains unknown at this point. Two alternative testable explanations for these patterns are proposed. First, selection for sex determination turnover may co-opt mechanisms (e.g., chromatin remodeling) favoring genomic rearrangements. Alternatively, chromosomal rearrangements underlying diploid number evolution may alter gene regulation enabling transitions in sex-determining mechanisms. Our data indicate that the evolution of sex determination is intimately linked to profound genomic changes underlying diploid number evolution, the ecological context of which remains intriguing.
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editionReceived December 1, 2010, Accepted January 24, 2011
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