Chromosomal Thermal Index: a comprehensive way to integrate the thermal adaptation of Drosophila subobscura whole karyotype.
© 2018 Published by NRC Research Press.
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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.
Keywords:Drosophila; Adaptation thermique; Chromosomes; Global warming; Inversions; Réchauffement climatique; Thermal adaptation
Source:Genome, 2018, 61, 2, 73-78
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- Ministerio de Economía y Competitividad - MINECO - IN2015-64395-R
- Ministerio de Economía y Competitividad - MINECO - CTM2013-48163
- Generalitat de Catalunya - 2014 SGR 336
- Generalitat de Catalunya - 2014 SGR 464