Document Detail

Comparative cytogenetics of giant trahiras Hoplias aimara and H. intermedius (Characiformes, Erythrinidae): chromosomal characteristics of minor and major ribosomal DNA and cross-species repetitive centromeric sequences mapping differ among morphologically identical karyotypes.
MedLine Citation:
PMID:  20924165     Owner:  NLM     Status:  MEDLINE    
Karyotype and cytogenetic characteristics of 2 species of giant trahiras, Hopliasintermedius, São Francisco river basin, and Hopliasaimara, Arinos river (Amazon basin), were examined by conventional (C-banding, Ag-NOR, DAPI/CMA(3) double-staining) and fluorescent in situ hybridization (FISH) with 5S, 18S rDNA probes and cross-species Cot-1 DNA probing. Both species invariably had diploid chromosome number 2n = 50 and identical karyotypes composed of 10 pairs of metacentric and 15 pairs of submetacentric chromosomes. On the other hand, staining with base-specific fluorochromes (CMA(3), DAPI) and FISH mapping of repetitive DNA sequences showed extensive interspecific differences: while the genome of H. aimara had one submetacentric pair bearing CMA(3)-positive (DAPI-negative) sites, that of H. intermedius had 4 such pairs; while FISH with a 5S rDNA probe showed one (likely homologous) signal-bearing pair, that with 18S rDNA displayed one signal-bearing pair in H. intermedius and 2 such pairs in H. aimara. Cross-species FISH probing with Cot-1 DNA prepared from total DNA of both species showed no signals of Cot-1 DNA from H. aimara on chromosomes of H. intermedius but reciprocally (Cot-1 DNA from H. intermedius on chromosomes of H. aimara) displayed signals on at least 4 chromosome pairs. Present findings indicate (i) different composition of repetitive sequences around centromeres, (ii) different NOR phenotypes and (iii) distinct taxonomic status of both giant trahira species.
D R Blanco; R L Lui; M R Vicari; L A C Bertollo; O Moreira-Filho
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-10-05
Journal Detail:
Title:  Cytogenetic and genome research     Volume:  132     ISSN:  1424-859X     ISO Abbreviation:  Cytogenet. Genome Res.     Publication Date:  2011  
Date Detail:
Created Date:  2010-11-02     Completed Date:  2010-11-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101142708     Medline TA:  Cytogenet Genome Res     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  71-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 S. Karger AG, Basel.
Departamento de Genética e Evolução, Universidade Federal de São Carlos, São Carlos, SP Brazil.
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MeSH Terms
Chromosome Mapping*
Fishes / genetics*
Microscopy, Fluorescence
RNA, Ribosomal / genetics*
Repetitive Sequences, Nucleic Acid*
Species Specificity
Reg. No./Substance:
0/RNA, Ribosomal

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