ISSN:
1573-6849
Keywords:
centromere
;
Ovis aries
;
Robertsonian translocations
;
satellite DNA
;
somatic cell hybrids
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A panel of sheep-hamster somatic cell hybrids containing single sheep chromosomes was used to study the chromosomal distribution and organization of two families of sheep centromeric satellite DNA. This study shows that the centromeres of the sheep metacentric chromosomes 1,2 and 3 differ in their organization and relative quantities of sheep satellite I DNA. The results, when correlated with the proposed formation of these metacentric chromosomes by ancient Robertsonian translocations, suggest a loss or replacement of satellite I centromeric DNA from the centromeres of these sheep chromosomes. Using Southern blot analysis and fluorescencein situ hybridization, this study shows that the recent centric fusion chromosome t2 (rob 9;10) contains little satellite II DNA. Together these resuults suggest the possibility of substantial reorganization of sheep centromeric DNA families after Robertsonian translocations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02254945
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