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Identification of Beef Breed using DNA Marker of Coat Color Genes  

Chung Eui-Ryong (상지대학교 생명자원과학대학 생명공학과)
Chung Ku-Young (상지대학교 생명자원과학대학 동물자원학과)
Publication Information
Food Science of Animal Resources / v.24, no.4, 2004 , pp. 355-360 More about this Journal
Abstract
In Korean beef market, one of the major problems is mislabeling or fraudulent distribution of Holstein dairy meat or imported beef as domestic Hanwoo meat. Therefore, there has been a great need for a development of technology to identify beef breeds in meat and meat products. This study was carried out to develop the accurate and reliable method for the identification of beef breed using PCR-RFLP marker of MC1R, MGF and TYRPl genes affecting coat colors in cattle. A single base substitution (G\longrightarrowT transition) at the codon for amino acid position 104 of MC1R gene was identified between Hanwoo and Holstein and Angus breeds. The change at this position creates Msp I restriction site in Holstein and Angus, but not in Hanwoo. When the DNA amplified products (537 bp) was digested with Msp I, Hanwoo meat showed a single band of 537bp, while two fragments of 329bp and 208 bp were observed in Holstein meat and Angus breed, respectively. Thus, breed-specific RFLP marker in the MC1R gene can be used to distinguish between Hanwoo meat and Holstein and Angus meats. In the RFLP genotype of MGF gene, the frequency of r/r type was 75％ in Manwoo, whereas the frequency of R/R was 80％ in Hereford breed. Holstein and Angus breeds showed 100％ for R/r type. Therefore, Hanwoo meat showed significant difference in the MGF genotype frequencies compared with those of Holstein meat and imported beef cattle breeds. However, TYRP1 gene showed the same genotype in all breeds examined. Thus, this TYRP1 gene can not be used as a molecular marker for breed identification. As a consequence, we suggest that RFLP markers of the MC1R and MGF coat color genes could be used as DNA marker for identification of Hanwoo meat from Holstein and imported meats.
Keywords
coat color genes; PCR-RFLP; DNA marker; beef breed identification;
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