Abstract
The aim of this study was to determine the frequency of the 12-bp and 23-bp indel polymorphisms in the prion protein gene (PRNP) in cattle and to investigate the association between these frequencies and the occurrence of bovine spongiform encephalopathy (BSE). There was no significant difference in the 12-bp indel frequency between the BSE animals and control group. For the 23-bp indel, the BSE animals had a significantly lower + + (insins) genotype frequency and + allele frequency compared with the control animals. The - - / - - genotype frequency in the BSE animals was not significantly higher when compared with the control animals. One - allele increased the risk of BSE by a factor of 1.55 (i.e. by 55%) for the 12-bp indel and by a factor of 2.10 for the 23-bp indel. When both indels are considered, one - allele increased the risk of BSE by a factor of 1.54.
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