Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system

Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system

The genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16...

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Main Authors: Renata da Rosa, Marceléia Rubert, Luiz R. Malabarba, Isabel Cristina Martins-Santos, Lucia Giuliano-Caetano
Format: Article
Language:English
Published: Sociedade Brasileira de Ictiologia
Series:Neotropical Ichthyology
Subjects:
Astyanax scabripinnis species complex
rDNA
Homologous transposition
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400007&lng=en&tlng=en
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spelling doaj-2fa584b34b5846de8eed0682e92b05192020-11-24T20:52:24ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02247460160510.1590/S1679-62252009000400007S1679-62252009000400007Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos systemRenata da Rosa0Marceléia Rubert1Luiz R. Malabarba2Isabel Cristina Martins-Santos3Lucia Giuliano-Caetano4Universidade Estadual de MaringáUniversidade Federal de São CarlosUniversidade Federal do Rio Grande do SulUniversidade Estadual de MaringáUniversidade Estadual de LondrinaThe genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16sm+16st+12a (FN = 88) was found, without differences between males and females. A few small heterochromatin blocks were observed, besides three more conspicuous C-bands, corresponding to NORs, as confirmed by silver nitrate and CMA3 staining, FISH, and DAPI negative staining. These regions were located in a medium-sized subtelocentric and in a large subtelocentric chromosomal pair, probably because of a deletion of this region in one homologous chromosome, or due to a transposition event between them.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400007&lng=en&tlng=enAstyanax scabripinnis species complexrDNAHomologous transposition
collection DOAJ
language English
format Article
sources DOAJ
author Renata da Rosa
Marceléia Rubert
Luiz R. Malabarba
Isabel Cristina Martins-Santos
Lucia Giuliano-Caetano
spellingShingle Renata da Rosa
Marceléia Rubert
Luiz R. Malabarba
Isabel Cristina Martins-Santos
Lucia Giuliano-Caetano
Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
Neotropical Ichthyology
Astyanax scabripinnis species complex
rDNA
Homologous transposition
author_facet Renata da Rosa
Marceléia Rubert
Luiz R. Malabarba
Isabel Cristina Martins-Santos
Lucia Giuliano-Caetano
author_sort Renata da Rosa
title Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
title_short Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
title_full Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
title_fullStr Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
title_full_unstemmed Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
title_sort cytogenetic analysis of astyanax laticeps (cope, 1894) (ostariophysi: characidae) from the laguna dos patos system
publisher Sociedade Brasileira de Ictiologia
series Neotropical Ichthyology
issn 1982-0224
description The genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16sm+16st+12a (FN = 88) was found, without differences between males and females. A few small heterochromatin blocks were observed, besides three more conspicuous C-bands, corresponding to NORs, as confirmed by silver nitrate and CMA3 staining, FISH, and DAPI negative staining. These regions were located in a medium-sized subtelocentric and in a large subtelocentric chromosomal pair, probably because of a deletion of this region in one homologous chromosome, or due to a transposition event between them.
topic Astyanax scabripinnis species complex
rDNA
Homologous transposition
url http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400007&lng=en&tlng=en
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