Document Detail

Occurrence of ZZ/ZW sex chromosomes in Thoracocharax stellatus fish (Characiformes, Gasteropelecidae) from the Araguaia River, South America.
MedLine Citation:
PMID:  17768596     Owner:  NLM     Status:  MEDLINE    
The karyotypic and chromosomal characteristics of the hatchetfish Thoracocharax stellatus from the Araguaia River, Brazil (Araguaia-Tocantins basin) were analyzed using Giemsa, AgNO(3), and CMA(3) fluorescent staining, and C-banding. The diploid chromosome number was 54 and the karyotypes of females and males were composed of six metacentrics, six submetacentrics, six subtelocentrics and 36 acrocentrics. Two unpaired acrocentric chromosomes were detected in the female karyotype. C-banding showed heterochromatic blocks at several chromosomes and an entirely heterochromatic acrocentric chromosome in females that was lacking in the male karyotype. This discovery indicated a heteromorphic sex chromosome system of the ZZ/ZW type. Ag-staining and CMA(3) fluorescence revealed one major chromosome pair bearing the NORs with the presence of additional signals in some metaphases. Both heterochromatic segments associated with Ag-NORs and the W chromosome were positively stained by CMA(3). Considering the present data and previous findings it is hypothesized that the occurrence of ZW sex chromosome system is widespread in the genus Thoracocharax.
Paulo Cesar Venere; Issakar Lima Souza; Cesar Martins; Claudio Oliveira
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-09-03
Journal Detail:
Title:  Genetica     Volume:  133     ISSN:  0016-6707     ISO Abbreviation:  Genetica     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-07     Completed Date:  2008-09-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370740     Medline TA:  Genetica     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  109-12     Citation Subset:  IM    
Instituto Universitário do Araguaia, Universidade Federal de Mato Grosso, Pontal do Araguaia, MT, 78698-000, Brazil.
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MeSH Terms
Chromosome Banding
Fishes / genetics*
Sex Chromosomes*
South America

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