Document Detail


Heterosynapsis and axial equalization of the sex chromosomes of the northern bobwhite quail.
MedLine Citation:
PMID:  1611912     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The pairing behavior of the Z and W chromosomes in the female northern bobwhite quail (Colinus virginianus) was analyzed by electron microscopy of silver-stained synaptonemal complexes (SCs). After autosomal pairing was completed, synapsis of the sex chromosomes initiated at the short-arm end of the W chromosome and one end of the Z chromosome. Synapsis then progressed unidirectionally, producing a sex bivalent in which the entire length of the W axis was paired with an equivalent length of the Z axis. Progressive contraction and asymmetrical twisting of the Z axis ultimately resulted in a fully paired configuration with aligned axial ends. Further contraction of the Z axis reduced the extent of asymmetrical twisting such that only the nonaligned centromeric regions distinguished the SC of the ZW bivalent from SCs of similar-sized autosomes in late-pachytene nuclei. Quantitative analyses indicated that the length of the Z axis shortened significantly during the adjustment process, whereas no significant difference occurred in the length of the W axis. The nonalignment of the centromeric regions during transitional stages of ZW synapsis indicates that direct heterosynapsis of nonhomologous segments, followed by axial equalization of the length inequality, is responsible for the length adjustment during synapsis in the sex chromosomes of the bobwhite quail.
Authors:
K M Hogan; G H Jarrell; E J Ryder; I F Greenbaum
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Cytogenetics and cell genetics     Volume:  60     ISSN:  0301-0171     ISO Abbreviation:  Cytogenet. Cell Genet.     Publication Date:  1992  
Date Detail:
Created Date:  1992-07-29     Completed Date:  1992-07-29     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0367735     Medline TA:  Cytogenet Cell Genet     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  131-4     Citation Subset:  IM    
Affiliation:
Department of Biology, Texas A&M University, College Station 77843-3258.
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MeSH Terms
Descriptor/Qualifier:
Animals
Centromere / ultrastructure
Colinus / genetics*
Female
Meiosis / genetics*
Microscopy, Electron
Oocytes / ultrastructure
Sex Chromosomes / ultrastructure*
Silver Staining
Synaptonemal Complex / genetics*
Grant Support
ID/Acronym/Agency:
GM27014/GM/NIGMS NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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