Reproductive and Developmental Biology

The Korean Society of Animal Reproduction (한국동물번식학회)
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Effect of Sequence Variation in Mitochondrial DNA D-loop Region on Milk and Milk Fat Production in Holstein Cows

Holstein의 유량과 유지방 생산에 미치는 Mitochondrial DNA D-loop 영역의 염기 서열 변이 효과

  • Oh J. D. (Genomic Informatics Center, Hankyong National University) ;
  • Kong H. S. (Genomic Informatics Center, Hankyong National University) ;
  • Lee H. K. (Genomic Informatics Center, Hankyong National University) ;
  • Jeon G. J. (Genomic Informatics Center, Hankyong National University)
  • 오재돈 (국립한경대학교 유전정보연구소) ;
  • 공홍식 (국립한경대학교 유전정보연구소) ;
  • 이학교 (국립한경대학교 유전정보연구소) ;
  • 전광주 (국립한경대학교 유전정보연구소)
  • Published : 2005.03.01
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Abstract

This study was performed to analyze the sequence variation in mtDNA D-loop and their effects on milk and milk fat production in Holstein cows. The analyzed sequences were compared with previously published sequences from other cattle breeds (GenBank J01394). PCR was performed to amplify a total of 964 bp between nucleotide 15758 and 383 within D-loop region of mtDNA using specific primers. Thirty five polymorphic sites by nucleotide substitution were found in mtDNA. The frequencies of positions at 106, 169, 16057, 16231 and 16255 nt with high levels of sequence polymorphism were 0.090, 0.555, 0.055, 0.090 and 0.050, respectively. The substitution effect at 169 nt was found significant on milk production, and substitution effect at 16118, 16139 and 16302 nt was highly significant (p<0.1) on milk fat production. Polymorphism of mtDNA sequence in D-loop region might be useful for the analysis of cytoplasmic genetic variation and associations with the other economically important traits and maternal lineage analysis in Holstein cows.

본 연구는 젖소(Holstein종)의 mtDNA D-loop 영역 염기변이 다형성과 경제형질간의 관련성을 분석하기 위하여 수행하였다. 젖소의 mtDNA D-loop 영역에서 단일염기의 치환에 의해 총 35개의 polymorphic site가 확인되었다. 그중 주요 Polymorphic site의 염기변이 빈도는 106, 169, 16057, 16231 및 16255 지역에서 높은 빈도의 염기치환이 검출되었다. 169 지역은 A가 G로 염기치환이 일어났고 그 빈도는 0.555로 높게 나타났으며 염기치환에 의한 산유량 효과는 1259.6 kg(P<0.05)로 나타났다. 유지방과의 관계를 분석한 결과 16118 지역은 A가 G로 치환되는 빈도가 0.02로 검출되었으며, 16135 지역은 T가 C로 치환되는 빈도가 0.02로 검출되었고, 16302 지역은 G가 A로 치환되는 빈도가 0.04로 검출되었다. 이 지역들이 유지방에 미치는 변이 효과는 - 156, - 118.15 및 - 67.77 kg(P<0.1)으로 나타났다. 본 연구에서 검출한 젖소 mtDNA내 D-loop 영역의 염기서열 변이 빈도와 유량, 유지방과의 연관성 분석 결과 등은 젖소집단의 유전적 변이성 추정과 좀 더 다양한 경제형질과의 관련성 분석으로 다양한 유전적 지표인자 발굴에 도움이 될 것이며 이를 통해 분자유전학적 기법을 이용한 젖소의 육종전략을 확립하는데 기초 자료가 되는 것은 물론 분자육종학적인 연구에 기초 자료로서 유용하게 활용할 수 있을 것으로 기대된다.

Keywords

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