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닭의 CaSR 유전자내 단일 염기 변이 탐색 및 경제 형질간의 연관성 분석

Identification of a SNP in Chicken CaSR Gene and Its Effect on Economic Traits

  • Hong, Y.S. (Genomic Informatics Center, Hankyong National University) ;
  • Oh, J.D. (Genomic Informatics Center, Hankyong National University) ;
  • Lee, J.H. (Genomic Informatics Center, Hankyong National University) ;
  • Kong, H.S. (Genomic Informatics Center, Hankyong National University) ;
  • Choi, C.H. (National Institute of Animal Science, Korea) ;
  • Lee, S.S. (National Institute of Animal Science, Korea) ;
  • Jeon, G.J. (Genomic Informatics Center, Hankyong National University) ;
  • Lee, H.K. (Genomic Informatics Center, Hankyong National University)
  • 발행 : 2007.06.30

초록

Calcium Sensing Recepter(CaSR) 유전자는 세포의 밖에서 칼슘의 항상성을 조절하는 역할을 담당하며, 부갑상선 호르몬의 분비를 조절하고 비뇨기에서 칼슘의 흡수를 담당하는 것으로 알려져 있다. CaSR 유전다의 체내 칼슘 농도 조절 기작은 동물의 여러 경제 형질에 영향을 미칠 것으로 추정되며 경제 형질 개량에 강력한 후보 유전자로서 가능성이 잠재되어 있다. 따라서 본 연구는 닭의 CaSR 유전자 내 염기 변이 지역을 탐색하고 이를 통해 검출된 변이 지역과 경제 형질간의 연관성을 규명하고자 실시하였다. 한국 재래닭의 AS 유전자형이 65%로 가장 높은 출현 빈도를 보였으며, SS 유전자형이 23%, AA 유전자형이 12%로 나타났다. 반면, 레그혼 품종에서는 AS 유전자형이 92%로 높은 빈도를 나타냈으며, AA 유전자형이 0.8%의 빈도를 보였다. 그리고 레그혼 품종에서 SS 유전자형은 발견되지 않았다. A963S 유전자형과 경제 형질간의 연관성 분석 결과를 레그혼 집단에서 분석된 결과에 따르면 시산일령에서 유전자형과의 유의한 연관성이 검출되었다. $AA(137.6{\pm}2.63)$ 유전자형은 $AS(143.0{\pm}1.60)$ 유전자형보다 빠른 시산일령을 가진 것으로 나타났다. 한국 재래닭 집단에서 분석된 결과에 따르면 시산일령과 난중에서 유전자형과의 유의한 연관성이 검출되었다. 시산일령의 경우 $AA(151.0{\pm}2.87)$$AS(152.6{\pm}1.21)$ 유전자형은 $SS(159.43{\pm}2.03)$ 유전자형보다 빠른 것으로 나타났으며, 난중은 $SS(50.4{\pm}0.81)$유전자형이 $AA(47.5{\pm}1.15)$$AS(47.85{\pm}0.49)$유전자형보다 무거운 것으로 나타났다. 본 연구의 결과 A963S 지역의 변이가 칼슘 농도의 조절에 영향을 미치고 이에 따른 프로게스테론이나 성장 호르몬 등의 분비에 영향을 미쳐 결과적으로 시산일령과의 유의적인 연관성이 나타난 것으로 추정된다. 대립 유전자 A를 분자 생물학적 마커로 이용하여 경제 형질중 산란일령을 앞당기는데 큰 기여를 할 수 있을 것으로 기대된다.

The Function of the calcium sensing receptor (CaSR) is to control calcium levels by altering PTH (parathyroid hormone) secretion and renal calcium resorption. The influence of calcium on the basal and stimulated release of several hormones from chicken pituitary glands has been determined in vitro. The objective of this study was to identify SNP in chicken CaSR gene and to investigate the effect of the SNP on economic traits. The sequencing analysis method was used to identify nucleotide polymorphisms within chicken CaSR gene. This study identified SNP at position 1949 bp(Genebank accession No : XM_416491) in the exon 1. The SNP changed the amino acid to alanine(GCC) from serine(TCC). This SNP showed three genotypes, AA, AS and SS by digestion with the restriction enzyme NcoⅠ using the PCR-RFLP method. The A963S showed significant effect only on the first lay day (P<0.05) in Leghorn population. Leghorn with the genotype AA had significantly faster the first lay day(137.6) than the genotype AS(143.0, P<0.05). Also, the A963S showed significant effect only on the first lay day(P<0.05) and mean of egg weight(P<0.05) in KNC population. KNC with the genotypes AA ans AS had significantly faster the first lay day (151.0 and 152.6, respectively) than the genotype SS(159.4, P<0.05). And the genotypes SS had significantly heavier the mean of egg weight(50.4 kg, P<0.05) than the genotype AA ans AS (47.5 and 47.8 kg, respectively). According to result of this study, an a allele of the A963S was found to have a significant effect on the first lay day. It will be possible to use this SNP marker on selecting chicken to improve the first lay day.

키워드

참고문헌

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