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돼지 Landrace 품종에서 Myostatin 유전자의 유전적 다형성과 성장형질과의 연관성

Association Between MSTN Gene Polymorphism and Growth Traits in Landrace Pigs

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참고문헌

주제분류축산학

초록

돼지 myostatin 유전자는 근아세포의 분화와 근육발달에 핵심적인 역할을 수행하는 것으로 알려져 있다. MSTN 유전자의 유전적 다형성을 SSCP 분석과 DNA 염기서열 분석법으로 조사하여 exon 3에서 단일염기치환(C2150T)를 발견하였다. Landrace 집단에서 다형성과 표현형의 연관을 시험한 결과 대립인자 T가 집단 내에서 돈육 성장형질들에 대한 양의 효과를 확인하였다. 생시 체중과 12주령 체중은 TT나 TC 유전자형이 CC 유전자형에서보다 더 무거운 것으로 드러났으나 유의적인 차이를 보이지 않았다. 반면, 대립인자 T는 등심단면적과 유의적인 상관관계를 나타내었다(P<0.05). 본 연구결과에서 MSTN exon 3에서 대립인자 T는 등지방두께의 감소와는 상관없이 등심단면적의 증가에 유의적인 효과를 나타내었다. 본 연구에서 확인된 exon 3의 유전적 다형성은 아미노산의 변화는 없지만, SSCP 분석 결과와 정확히 일치하는 TaqⅠ-RFLP 기법은 Landrace 돼지 육종에서 중대한 표지 마커로서 유용하게 이용될 것으로 사료된다.

Abstract

Porcine myostatin(MSTN) gene plays a key role in the differentiation of myoblast and muscle development. Genetic polymorphism was screened by single stranded conformation polymorphism(SSCP) analysis and subsequent DNA sequencing detected a nucleotide substitution(C2150T) in exon 3 of MSTN gene. Phenotypic association of the polymorphism was tested in a Landrace population and positive effects of the allele T for lean growth traits were found in the population. Even though it is not significant, the pigs have TT and TC genotypes were heavier for the body weight at birth and at twenty weeks of age than those containing genotype CC. However, the allele T was significantly associated with higher eye muscle area(P<0.05). As a result of this study, we suggested that the allele T in exon 3 of MSTN gene comes a significant effect for increasing the eye muscle area without decreasing backfat thickness. This polymorphism did not change the amino acid but TaqⅠ-RFLP matched to SSCP band patterns in exon 3 of MSTN gene, which will be an useful molecular marker for breeding of Landrace pigs.

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