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ARTICLE |
-hydroxysteroid dehydrogenase gene
1 Division of Farm Animal Science, School of Clinical Veterinary Science, University of Bristol, Langford, Bristol, BS40 5DU, UK.
* To whom correspondence should be addressed. E-mail: e.udovikova{at}bristol.ac.uk.
| Abstract |
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The entire sequence of the pig 3
-hydroxysteroid dehydrogenase (3
-HSD) gene has recently become known. This gene is deemed to be important in androstenone metabolism in pig liver and its defective expression has been shown to be related to androstenone accumulation in adipose tissue and the development of boar taint. The aim of the present work was (i) to define the structure of the pig 3
-HSD gene and (ii) to compare 3
-HSD DNA sequences from pigs of different breeds, which vary in adipose tissue androstenone levels in order to identify a polymorphism which might be responsible for differential 3
-HSD expression. The 5' flanking and the coding region of 3
-HSD were cloned and sequenced by conventional techniques. The 3
-HSD coding regions were identical in pigs of different breeds and in animals with high and low androstenone levels. Significant sequence variations were found in the 5' flanking region of the 3
-HSD gene, where differences in the number of TTAT repeats and 3 SNP were observed. The SNP were associated with the number of the TTAT repeats. These variations in the 3
-HSD DNA sequence were not associated with androstenone level in subcutaneous adipose tissue but were breed-dependent. The results of this work might be used for detection of the presence of Meishan genes in Western pig breeds especially if phenotype is not clearly established.
Key Words: breed, pig, 3-beta-hydroxysteroid dehydrogenase, polymorphism
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