Document Detail

Molecular cytogenetics and characterization of a ZZ/ZW sex chromosome system in Triportheus nematurus (Characiformes, Characidae).
MedLine Citation:
PMID:  17705059     Owner:  NLM     Status:  MEDLINE    
Chromosomes of Triportheus nematurus, a fish species from family Characidae, were analyzed in order to establish the conventional karyotype, location of C-band positive heterochromatin, Ag-NORs, GC- and AT-rich sites, and mapping of 18S and 5S rDNA with fluorescence in situ hybridization (FISH). The diploid number found was 2n = 52 chromosomes in both males and females. However, the females presented a pair of differentiated heteromorphic chromosomes, characterizing a ZZ/ZW sex chromosome system. The Z chromosome was metacentric and the largest one in the karyotype, bearing C-positive heterochromatin at pericentromeric and telomeric regions. The W chromosome was middle-sized submetacentric, appearing mostly heterochromatic after C-banding and presenting heterogeneous heterochromatin composed of GC- and AT-rich regions revealed by fluorochrome staining. Ag-NORs were also GC-rich and surrounded by heterochromatic regions, being located at the secondary constriction on the short arms of the second chromosome pair, in agreement with 18S rDNA sites detected with FISH. The 18S and 5S rDNA were aligned in tandem, representing an uncommon situation in fishes. The results obtained reinforce the basal condition of the ZZ/ZW sex system in the genus Triportheus, probably arisen prior to speciation in the group.
Débora Diniz; Orlando Moreira-Filho; Luiz Antonio Carlos Bertollo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-08-20
Journal Detail:
Title:  Genetica     Volume:  133     ISSN:  0016-6707     ISO Abbreviation:  Genetica     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-03-31     Completed Date:  2008-06-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370740     Medline TA:  Genetica     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  85-91     Citation Subset:  IM    
Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP 13565-905, Brazil.
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MeSH Terms
Cytogenetic Analysis / methods*
Fishes / genetics*
Heterochromatin / genetics
In Situ Hybridization, Fluorescence
Sex Chromosomes / genetics*
Reg. No./Substance:

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