Chromosomal Thermal Index: a comprehensive way to integrate the thermal adaptation of Drosophila subobscura whole karyotype

Drosophila has demonstrated to be an excellent model to study the adaptation of organisms to global warming, with inversion chromosomal polymorphism having a key role in this adaptation. Here, we introduce a new index (Chromosomal Thermal Index or CTI) to quantify the thermal adaptation of a populat...

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Bibliographic Details
Published inGenome Vol. 61; no. 2; pp. 73 - 78
Main Authors Arenas, Conxita, Zivanovic, Goran, Mestres, Francesc
Format Journal Article
LanguageEnglish
Published Canada NRC Research Press 01.02.2018
Canadian Science Publishing NRC Research Press
Subjects
Adaptation
Animal populations
Animals
Chromosomes
Chromosomes, Insect
Climate change
Cromosomes
Drosophila
Drosophila - genetics
Drosophila subobscura
Drosòfila subobscura
Genes
Genetic aspects
Genomes
Global Warming
Homology
Hypotheses
Indexes
Insects
Inversions
Karyotype
Karyotypes
Natural populations
Physiological aspects
Polymorphism
Polymorphism, Genetic
Population (statistical)
Studies
Temperature
adaptation thermique
global warming
inversions
Drosophila
chromosomes
thermal adaptation
réchauffement climatique
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Summary:Drosophila has demonstrated to be an excellent model to study the adaptation of organisms to global warming, with inversion chromosomal polymorphism having a key role in this adaptation. Here, we introduce a new index (Chromosomal Thermal Index or CTI) to quantify the thermal adaptation of a population according to its composition of "warm" and "cold" adapted inversions. This index is intuitive, has good statistical properties, and can be used to hypothesis on the effect of global warming on natural populations. We show the usefulness of CTI using data from European populations of D. subobscura, sampled in different years. Out of 15 comparisons over time, nine showed significant increase of CTI, in accordance with global warming expectations. Although large regions of the genome outside inversions contain thermal adaptation genes, our results show that the total amount of warm or cold inversions in populations seems to be directly involved in thermal adaptation, whereas the interactions between the inversions content of homologous and non-homologous chromosomes are not relevant.
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ISSN:0831-2796
1480-3321
DOI:10.1139/gen-2017-0124