Article (Scientific journals)
Meiotic segregation analysis in cows carrying the t(1;29) Robertsonian translocation.
Bonnet-Garnier, A; Lacaze, S; Beckers, Jean-François et al.
2008In Cytogenetic and Genome Research, 120, p. 91-96
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Abstract :
[en] Heterozygous carriers of Robertsonian translocations generally have a normal phenotype but present reproductive failure. In cattle, the t(1;29) Robertsonian translocation is very common and carriers show a 3-5% decrease in fertility. Some data suggest that female carriers have a higher decrease than male carriers but no direct studies of the chromosome content of oocytes from a t(1;29) carrier cow have been performed so far. Four heterozygous carrier cows underwent hormonal stimulations and follicles punctions and about 800 oocytes were matured in vitro. Six hundred metaphase II preparations were obtained and analysed by fluorescent in situ hybridization with bovine chromosome 1 and 29 painting probes. Proportions of different kinds of oocytes were assessed: 74.11% (292/394) were normal and balanced, 4.06% (16/394) unbalanced and 21.83% (86/394) diploid. For all cows, the number of normal oocytes was not significantly different from the number of translocated oocytes but the diploidy and unbalanced rate were significantly different between them. As found in bulls, the meiotic segregation pattern in cows has shown a preponderance of alternate products. However, the frequency of unbalanced gametes determined in females (4.06%) was significantly higher than the frequency observed in males (2.76%). The divergence in the rate of diploid gametes (0.04% vs. 21.83%) is mainly explained by the difference between males and females.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Bonnet-Garnier, A
Lacaze, S
Beckers, Jean-François  ;  Université de Liège - ULiège > Département de sciences fonctionnelles > Physiologie de la reproduction
Berland, HM
Pinton, A
Yerle, M
Ducos, A
Language :
English
Title :
Meiotic segregation analysis in cows carrying the t(1;29) Robertsonian translocation.
Publication date :
2008
Journal title :
Cytogenetic and Genome Research
ISSN :
1424-8581
eISSN :
1424-859X
Publisher :
S. Karger
Volume :
120
Pages :
91-96
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 March 2009

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