Document Detail

Polymorphic nature of nucleolus organizer regions in fishes.
MedLine Citation:
PMID:  6173166     Owner:  NLM     Status:  MEDLINE    
An analysis of the nucleolar organizer region(NOR) by silver staining of five species of the order Gymnotiformes, Gymnotus carapo, Apteronotus albifrons, Sternopygus macrurus, Eigenmannia virescens, and Eigenmannia sp., is reported. The five species presented only one pair of homologs bearing NORs. In G. carapo, A. albifrons, and S. macrurus the silver-stained NORs were present as small black dots over the chromosomes. In E. virescens, the short arm of one of the largest chromosome pairs was entirely stained with silver. Eigenmannia sp. presented an intraspecific variability of the NOR-bearing pair and an increase in the length of this region, the larger one being about six times the size of the smaller. These findings suggest that an increase in the number of ribosomal genes in the NORs of certain species occurred during the evolution of this group.
F Foresti; L F Almeida Toledo; S A Toledo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Cytogenetics and cell genetics     Volume:  31     ISSN:  0301-0171     ISO Abbreviation:  Cytogenet. Cell Genet.     Publication Date:  1981  
Date Detail:
Created Date:  1982-04-22     Completed Date:  1982-04-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0367735     Medline TA:  Cytogenet Cell Genet     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  137-44     Citation Subset:  IM    
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MeSH Terms
Chromosomes / ultrastructure
Fishes / genetics*
Nucleolus Organizer Region / ultrastructure*
Staining and Labeling

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