Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Reciprocal X;1 translocation in calf Mayr | 305 Genet. Sei. Evol. 30 1998 305-308 Inra Elsevier Paris Note Reciprocal X 1 translocation in a calf B. Mayra H. Korba s. Kiendlera G. Bremb a Institute for Animal Breeding and Genetics Veterinary University Veterinarplatz 1 1210 Vienna Austria b Ludwig Boltzmann Institute for Immuno- Cyto- and Moleculargenetic Research Veterinary University Veterinarplatz 1 1210 Vienna Austria Received 28 November 1997 accepted 26 February 1998 Abstract - A reciprocal translocation 60 XX t X l 42 13 was detected in a 2-month-old chimeric calf. A study of the parents of the calf strongly suggested the de novo origin of the aberration. Inra Elsevier Paris cattle reciprocal translocation X-autosomal cytogenetics Resume - Une translocation réciproque 60 XX t X l 42 13 sur un veau. Une translocation réciproque d un veau chimérique de 2 mois a été détectée. L examen de ses parents fait penser à 1 origine de novo de 1 aberration. Inra Elsevier Paris bovin translocation réciproque X-autosomale I cytogénétique 1. INTRODUCTION Despite the high economic importance of cattle in farm animal breeding very few data are available on reciprocal translocations in this species. Known interautosomal reciprocal exchanges are 60 XY t 10 ll 41 14 in a bull showing a 60-90 days non-return rate of 30 11 12 60 XY t 2q- 20q t 8q- 27q in an infertile bull 15 and 60 XY t 8 15 21 24 in a bull with a 60-90 days non-return rate of 25 13 . Further cases were 60 XY t l 8 9 q43 ql3 q26 with a reduction in 60-90 days non-return of 8 60 XY t 20 24 ql7 q25 with a reduction of 60-90 days non-return of 17 16 and 60 XY t 8 13 qll q24 in a sterile bull 1 In addition to these interautosomal reciprocal translocations there are also a few known cases of X-autosome translocations 2 3 5 6 9 14 . Now we have detected a further reciprocal translocation of the X-autosome type in cattle. Correspondence and reprints E-mail 306 B. Mayr et al. 2. MATERIALS AND METHODS The 50 chimeric twins examined .
