Document Detail

Cytogenetic peculiarities in the Algerian hedgehog: silver stains not only NORs but also heterochromatic blocks.
MedLine Citation:
PMID:  7649754     Owner:  NLM     Status:  MEDLINE    
Hedgehogs belong to one of the several mammalian taxa in which karyotype differences are based on variations in heterochromatin content. Furthermore, the number and location of nucleolar organizer regions (NORs) can also vary widely. In the present study these cytogenetic features were investigated in the Algerian hedgehog, Erinaceus (Aethechinus) algirus. The heterochromatin and NOR distribution patterns in the karyotype of this species are new among hedgehogs, whereas the euchromatic regions, including their G-band pattern, are similar to those reported by others. In addition, silver staining revealed a cytogenetic feature exclusive to the heterochromatic blocks of E. algirus: their silver staining with standard cytogenetic procedures. Because no similar phenomenon has been described previously in a mammalian species, several hypotheses about the significance and specificity of silver staining to NOR sites are discussed. Finally, the existence of different types of heterochromatin in the species analysed here, lead us to propose that what hedgehogs have inherited from their common ancestor is a mechanism which permits the accumulation of heterochromatin on specific chromosomes, rather than the heterochromatin itself.
A Sánchez; R Jiménez; M Burgos; S Stitou; F Zurita; R Díaz de la Guardia
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Heredity     Volume:  75 ( Pt 1)     ISSN:  0018-067X     ISO Abbreviation:  Heredity     Publication Date:  1995 Jul 
Date Detail:
Created Date:  1995-09-27     Completed Date:  1995-09-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0373007     Medline TA:  Heredity     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  10-6     Citation Subset:  IM    
Departamento de Genética, Facultad de Ciencias, Universidad de Granada, Spain.
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MeSH Terms
Chromosome Banding / methods
DNA, Ribosomal / genetics
Hedgehogs / genetics*
Heterochromatin / chemistry*
In Situ Hybridization
Nucleolus Organizer Region / chemistry*
Polymorphism, Genetic
RNA, Ribosomal, 18S / genetics
Silver Staining*
Reg. No./Substance:
0/DNA, Ribosomal; 0/Heterochromatin; 0/RNA, Ribosomal, 18S

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