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Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences

Surgeonfishes are a species-rich group and a major biomass on coral reefs. Three species are commonly found throughout South Atlantic, Acanthurus bahianus, A. chirurgus, and A. coeruleus. In this paper, we present the first cytogenetic data of these species, revealing a sequential chromosomal divers...

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Autores principales: Affonso, Paulo Roberto Antunes de Mello, Fernandes, Maria Aparecida, Almeida, Josivanda Santos, Molina, Wagner Franco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4146357/
https://www.ncbi.nlm.nih.gov/pubmed/25197714
http://dx.doi.org/10.1155/2014/825703
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author Affonso, Paulo Roberto Antunes de Mello
Fernandes, Maria Aparecida
Almeida, Josivanda Santos
Molina, Wagner Franco
author_facet Affonso, Paulo Roberto Antunes de Mello
Fernandes, Maria Aparecida
Almeida, Josivanda Santos
Molina, Wagner Franco
author_sort Affonso, Paulo Roberto Antunes de Mello
collection PubMed
description Surgeonfishes are a species-rich group and a major biomass on coral reefs. Three species are commonly found throughout South Atlantic, Acanthurus bahianus, A. chirurgus, and A. coeruleus. In this paper, we present the first cytogenetic data of these species, revealing a sequential chromosomal diversification. A. coeruleus was characterized by a relatively conserved karyotype evolved by pericentric inversions of some pairs (2n = 48, 2sm + 4st + 42a). In contrast, the karyotypes of A. bahianus (2n = 36) and A. chirurgus (2n = 34) were highly differentiated by the presence of six large metacentric pairs in A. bahianus (12m + 2sm + 4st + 18a) and A. chirurgus (12m + 2sm + 4st +1 6a) probably derived by chromosomal fusions that corroborate their closer relationship. A discernible in tandem fusion represents an autapomorphic character to A. chirurgus. In spite of macrostructure variation, single nucleolar organizer regions (NORs) on short arms of a subtelocentric pair and similar distribution of C-bands were observed in the three species. Overlapping of chromosomal data with molecular phylogeny indicated pericentric inversions which took place nearly at 19 Ma while centric fusions are as recent as 5 Ma. A physical mapping of coding and noncoding sequences in Acanthurus could clarify the role of additional rearrangements during their chromosomal evolution.
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spelling pubmed-41463572014-09-07 Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences Affonso, Paulo Roberto Antunes de Mello Fernandes, Maria Aparecida Almeida, Josivanda Santos Molina, Wagner Franco ScientificWorldJournal Research Article Surgeonfishes are a species-rich group and a major biomass on coral reefs. Three species are commonly found throughout South Atlantic, Acanthurus bahianus, A. chirurgus, and A. coeruleus. In this paper, we present the first cytogenetic data of these species, revealing a sequential chromosomal diversification. A. coeruleus was characterized by a relatively conserved karyotype evolved by pericentric inversions of some pairs (2n = 48, 2sm + 4st + 42a). In contrast, the karyotypes of A. bahianus (2n = 36) and A. chirurgus (2n = 34) were highly differentiated by the presence of six large metacentric pairs in A. bahianus (12m + 2sm + 4st + 18a) and A. chirurgus (12m + 2sm + 4st +1 6a) probably derived by chromosomal fusions that corroborate their closer relationship. A discernible in tandem fusion represents an autapomorphic character to A. chirurgus. In spite of macrostructure variation, single nucleolar organizer regions (NORs) on short arms of a subtelocentric pair and similar distribution of C-bands were observed in the three species. Overlapping of chromosomal data with molecular phylogeny indicated pericentric inversions which took place nearly at 19 Ma while centric fusions are as recent as 5 Ma. A physical mapping of coding and noncoding sequences in Acanthurus could clarify the role of additional rearrangements during their chromosomal evolution. Hindawi Publishing Corporation 2014 2014-08-12 /pmc/articles/PMC4146357/ /pubmed/25197714 http://dx.doi.org/10.1155/2014/825703 Text en Copyright © 2014 Paulo Roberto Antunes de Mello Affonso et al. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Affonso, Paulo Roberto Antunes de Mello
Fernandes, Maria Aparecida
Almeida, Josivanda Santos
Molina, Wagner Franco
Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences
title Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences
title_full Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences
title_fullStr Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences
title_full_unstemmed Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences
title_short Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences
title_sort sequential steps of chromosomal differentiation in atlantic surgeonfishes: evolutionary inferences
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4146357/
https://www.ncbi.nlm.nih.gov/pubmed/25197714
http://dx.doi.org/10.1155/2014/825703
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