The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae)
Ageneiosus is the most widely distributed genus of the family Auchenipteridae among South American river basins. Although chromosome studies in the family are scarce, this genus has the largest number of analyzed species, with 2n = 54 to 56 chromosomes, differing from the rest of the family (2n = 58...
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Sociedade Brasileira de Ictiologia
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doaj-ffacc666cb024ce88cdcda4d1f38a4de2020-11-24T22:23:20ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-022411232733410.1590/S1679-62252013005000004S1679-62252013000200327The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae)Roberto Laridondo LuiDaniel Rodrigues BlancoJuliana de Fatima MartinezVladimir Pavan MargaridoPaulo Cesar VenereOrlando Moreira FilhoAgeneiosus is the most widely distributed genus of the family Auchenipteridae among South American river basins. Although chromosome studies in the family are scarce, this genus has the largest number of analyzed species, with 2n = 54 to 56 chromosomes, differing from the rest of the family (2n = 58). This study aimed to analyze Ageneiosus inermis from the Araguaia River basin. The diploid number found was of 56 chromosomes. Heterochromatin was allocated in terminal region of most chromosomes, plus a pericentromeric heterochromatic block in pair 1, a pair distinguished by size in relation to other chromosomes pairs. AgNORs were detected in only one submetacentric chromosome pair, which was confirmed by FISH. 5S rDNA was present in only one metacentric chromosome pair. Hybridization with [TTAGGG]n sequence marked the telomeres of all chromosomes, in addition to an ITS in the proximal region of the short arm of pair 1. The repetitive [GATA]n sequence was dispersed, with preferential location in terminal region of the chromosomes. Ageneiosus has a genomic organization somewhat different when compared to other Auchenipteridae species. Evidences indicate that a chromosomal fusion originated the first metacentric chromosome pair in A. inermis, rearrangement which may be a basal event for the genushttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200327&lng=en&tlng=enC bandingCytogenetic Markers[GATA]n sequencerDNA-FISH[TTAGGG]n sequence |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Roberto Laridondo Lui Daniel Rodrigues Blanco Juliana de Fatima Martinez Vladimir Pavan Margarido Paulo Cesar Venere Orlando Moreira Filho |
spellingShingle |
Roberto Laridondo Lui Daniel Rodrigues Blanco Juliana de Fatima Martinez Vladimir Pavan Margarido Paulo Cesar Venere Orlando Moreira Filho The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae) Neotropical Ichthyology C banding Cytogenetic Markers [GATA]n sequence rDNA-FISH [TTAGGG]n sequence |
author_facet |
Roberto Laridondo Lui Daniel Rodrigues Blanco Juliana de Fatima Martinez Vladimir Pavan Margarido Paulo Cesar Venere Orlando Moreira Filho |
author_sort |
Roberto Laridondo Lui |
title |
The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae) |
title_short |
The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae) |
title_full |
The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae) |
title_fullStr |
The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae) |
title_full_unstemmed |
The role of chromosomal fusion in the karyotypic evolution of the genus Ageneiosus (Siluriformes: Auchenipteridae) |
title_sort |
role of chromosomal fusion in the karyotypic evolution of the genus ageneiosus (siluriformes: auchenipteridae) |
publisher |
Sociedade Brasileira de Ictiologia |
series |
Neotropical Ichthyology |
issn |
1982-0224 |
description |
Ageneiosus is the most widely distributed genus of the family Auchenipteridae among South American river basins. Although chromosome studies in the family are scarce, this genus has the largest number of analyzed species, with 2n = 54 to 56 chromosomes, differing from the rest of the family (2n = 58). This study aimed to analyze Ageneiosus inermis from the Araguaia River basin. The diploid number found was of 56 chromosomes. Heterochromatin was allocated in terminal region of most chromosomes, plus a pericentromeric heterochromatic block in pair 1, a pair distinguished by size in relation to other chromosomes pairs. AgNORs were detected in only one submetacentric chromosome pair, which was confirmed by FISH. 5S rDNA was present in only one metacentric chromosome pair. Hybridization with [TTAGGG]n sequence marked the telomeres of all chromosomes, in addition to an ITS in the proximal region of the short arm of pair 1. The repetitive [GATA]n sequence was dispersed, with preferential location in terminal region of the chromosomes. Ageneiosus has a genomic organization somewhat different when compared to other Auchenipteridae species. Evidences indicate that a chromosomal fusion originated the first metacentric chromosome pair in A. inermis, rearrangement which may be a basal event for the genus |
topic |
C banding Cytogenetic Markers [GATA]n sequence rDNA-FISH [TTAGGG]n sequence |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200327&lng=en&tlng=en |
work_keys_str_mv |
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