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...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2014-01-01
|
| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/825703 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849468524252102656 |
|---|---|
| author | Paulo Roberto Antunes de Mello Affonso Maria Aparecida Fernandes Josivanda Santos Almeida Wagner Franco Molina |
| author_facet | Paulo Roberto Antunes de Mello Affonso Maria Aparecida Fernandes Josivanda Santos Almeida Wagner Franco Molina |
| author_sort | Paulo Roberto Antunes de Mello Affonso |
| collection | DOAJ |
| 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. |
| format | Article |
| id | doaj-art-fd27d55ebe774b458fe18183a463b6f5 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-fd27d55ebe774b458fe18183a463b6f52025-08-20T03:25:50ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/825703825703Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary InferencesPaulo Roberto Antunes de Mello Affonso0Maria Aparecida Fernandes1Josivanda Santos Almeida2Wagner Franco Molina3Departamento de Ciências Biológicas, Universidade Estadual do Sudoeste da Bahia, 45206-150 Jequié, BA, BrazilDepartamento de Biologica Celular e Genética, Universidade Federal do Rio Grande do Norte, 59078-970 Natal, RN, BrazilDepartamento de Ciências Biológicas, Universidade Estadual do Sudoeste da Bahia, 45206-150 Jequié, BA, BrazilDepartamento de Biologica Celular e Genética, Universidade Federal do Rio Grande do Norte, 59078-970 Natal, RN, BrazilSurgeonfishes 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.http://dx.doi.org/10.1155/2014/825703 |
| spellingShingle | Paulo Roberto Antunes de Mello Affonso Maria Aparecida Fernandes Josivanda Santos Almeida Wagner Franco Molina Sequential Steps of Chromosomal Differentiation in Atlantic Surgeonfishes: Evolutionary Inferences The Scientific World Journal |
| 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 |
| url | http://dx.doi.org/10.1155/2014/825703 |
| work_keys_str_mv | AT paulorobertoantunesdemelloaffonso sequentialstepsofchromosomaldifferentiationinatlanticsurgeonfishesevolutionaryinferences AT mariaaparecidafernandes sequentialstepsofchromosomaldifferentiationinatlanticsurgeonfishesevolutionaryinferences AT josivandasantosalmeida sequentialstepsofchromosomaldifferentiationinatlanticsurgeonfishesevolutionaryinferences AT wagnerfrancomolina sequentialstepsofchromosomaldifferentiationinatlanticsurgeonfishesevolutionaryinferences |