Molecular genetic characterization of Robertsonian translocations in cattle |
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Authors: | H Joerg D Garner S Rieder D Suwattana & G Stranzinger |
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Institution: | Department of Animal Sciences, Swiss Federal Institute of Technology, Zurich, Switzerland,;XY Inc., ARBL, CSU Foothills Research Campus, Fort Collins, USA,;Department of Animal Husbandry, Chulalongkorn University, Bangkok, Thailand |
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Abstract: | The chromosome fusion of acrocentric chromosomes, known as Robertsonian translocations, are the most common chromosome rearrangement in Bovidae. Cytogenetic studies revealed differences between the centromeres of Robertsonian translocations: the rob(1; 29) is called monocentric, whereas rob(14; 20) is a dicentric chromosome. To analyse the type of fusion, satellite sequences were hybridised to metaphase chromosomes of carriers of rob(1; 29) from different breeds and rob(14; 20) from the Simmental breed. A repeat element of the bovine 1.715 satellite was located in the centromeric regions of all 29 bovine acrocentric chromosomes. No signals were observed on either the X-,Y- or the rob(1; 29) chromosomes. In contrast, all rob(14; 20) chromosomes gave a distinct hybridisation signal. Microsatellite markers in the linkage group, originating from the fusion, revealed a characteristic allele combination for rob(1; 29) in all carriers and were able to confirm the screening of metaphases of 220 daughters of a heterozygote carrier of the rob(1; 29). The results indicate that rob(1; 29) lost parts of both centromeres and that the 1.715 satellite DNA is not necessary for the functioning of the centromere. Furthermore, rob(1; 29) appears to derive from the same mutation and is transmitted according to Mendelian law. |
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