Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies

Abstract Despite predictions of the classic, hybrid-sterility model of chromosomal speciation, some organisms demonstrate high rate of karyotype evolution. This rate is especially impressive in Agrodiaetus butterflies that rapidly evolved the greatest chromosome number diversity known in animal king...

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Autores principales:	Alisa O. Vershinina, Vladimir A. Lukhtanov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4fbc16b0444a4161abba76c5fb14f21b
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spelling	oai:doaj.org-article:4fbc16b0444a4161abba76c5fb14f21b2021-12-02T16:08:01ZEvolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies10.1038/s41598-017-08525-62045-2322https://doaj.org/article/4fbc16b0444a4161abba76c5fb14f21b2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08525-6https://doaj.org/toc/2045-2322Abstract Despite predictions of the classic, hybrid-sterility model of chromosomal speciation, some organisms demonstrate high rate of karyotype evolution. This rate is especially impressive in Agrodiaetus butterflies that rapidly evolved the greatest chromosome number diversity known in animal kingdom within a single subgenus. Here we analyzed karyotype evolution in Agrodiaetus using phylogenetic comparative methods. We found that chromosome numbers possess a strong phylogenetic signal. This disproves the chromosome megaevolution model that proposes multiple chromosome rearrangements to accumulate independently in each of closely related species. We found that Brownian motion gives a more adequate description of observed trait changes than Ornstein-Uhlenbeck model. This indicates that chromosome numbers evolve via random walk along branches of the phylogeny. We discovered a correlation between karyotype changes and phylogeny branch lengths. This gradual pattern is inconsistent with the hybrid-sterility model which, due to association of major chromosome changes with cladogenetic events, predicts a high degree of punctualism in karyotype evolution. Thus, low underdominace of chromosomal rearrangements and/or prevalence of the recombination-suppression model over the hybrid-sterility model of chromosome speciation are the most common engines of the runaway chromosome number change observed.Alisa O. VershininaVladimir A. LukhtanovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alisa O. Vershinina Vladimir A. Lukhtanov Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
description	Abstract Despite predictions of the classic, hybrid-sterility model of chromosomal speciation, some organisms demonstrate high rate of karyotype evolution. This rate is especially impressive in Agrodiaetus butterflies that rapidly evolved the greatest chromosome number diversity known in animal kingdom within a single subgenus. Here we analyzed karyotype evolution in Agrodiaetus using phylogenetic comparative methods. We found that chromosome numbers possess a strong phylogenetic signal. This disproves the chromosome megaevolution model that proposes multiple chromosome rearrangements to accumulate independently in each of closely related species. We found that Brownian motion gives a more adequate description of observed trait changes than Ornstein-Uhlenbeck model. This indicates that chromosome numbers evolve via random walk along branches of the phylogeny. We discovered a correlation between karyotype changes and phylogeny branch lengths. This gradual pattern is inconsistent with the hybrid-sterility model which, due to association of major chromosome changes with cladogenetic events, predicts a high degree of punctualism in karyotype evolution. Thus, low underdominace of chromosomal rearrangements and/or prevalence of the recombination-suppression model over the hybrid-sterility model of chromosome speciation are the most common engines of the runaway chromosome number change observed.
format	article
author	Alisa O. Vershinina Vladimir A. Lukhtanov
author_facet	Alisa O. Vershinina Vladimir A. Lukhtanov
author_sort	Alisa O. Vershinina
title	Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
title_short	Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
title_full	Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
title_fullStr	Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
title_full_unstemmed	Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies
title_sort	evolutionary mechanisms of runaway chromosome number change in agrodiaetus butterflies
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/4fbc16b0444a4161abba76c5fb14f21b
work_keys_str_mv	AT alisaovershinina evolutionarymechanismsofrunawaychromosomenumberchangeinagrodiaetusbutterflies AT vladimiralukhtanov evolutionarymechanismsofrunawaychromosomenumberchangeinagrodiaetusbutterflies
_version_	1718384654405337088

Evolutionary mechanisms of runaway chromosome number change in Agrodiaetus butterflies

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