Document Detail

Cytogenetic analysis of the paternal sex ratio chromosome of Nasonia vitripennis.
MedLine Citation:
PMID:  7681418     Owner:  NLM     Status:  MEDLINE    
Paternal sex ratio (PSR) is a B chromosome found in the parasitic wasp Nasonia vitripennis. PSR has a unique etiology in that it destroys the paternal chromosomes of fertilized eggs, resulting in the production of all male families. This study examined structural aspects of PSR including size, C-banding, and silver staining. PSR was found to constitute approximately 5.7% of the genome of carrier males. C-banding confirmed the heterochromatic nature of PSR and the data suggest that PSR remains primarily condensed throughout the cell cycle. Examination of prometaphase spermatocytes revealed a secondary constriction on PSR. The constriction, however, did not stain positive for nucleolus organizer activity. During mitosis, PSR and the pericentromeric regions of the A chromosomes displayed a temporal pattern of silver staining, involving dense precipitation of silver prior to metaphase. This reaction is indicative of a protein complex specific to the heterochromatin of these regions. The implications of these findings to the origin of PSR are discussed.
K M Reed
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Genome / National Research Council Canada = Génome / Conseil national de recherches Canada     Volume:  36     ISSN:  0831-2796     ISO Abbreviation:  Genome     Publication Date:  1993 Feb 
Date Detail:
Created Date:  1993-04-23     Completed Date:  1993-04-23     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8704544     Medline TA:  Genome     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  157-61     Citation Subset:  IM    
Department of Biology, University of Rochester, NY 14627.
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MeSH Terms
Centromere / ultrastructure
Chromosomes / ultrastructure
Heterochromatin / ultrastructure
Nucleolus Organizer Region / ultrastructure
Sex Ratio
Staining and Labeling
Wasps / genetics*
Grant Support
Reg. No./Substance:
0/Heterochromatin; 7440-22-4/Silver

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