Clinical and Experimental Pediatrics

The Korean Pediatric Society (대한소아청소년과학회)
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The relationship between Gly71Arg and TATA box polymorphism of GT1A1 gene and prolonged hyperbilirubinemia of breast milk feeding infant in Korean

지속성 고빌리루빈혈증과 연관된 모유 황달에서 UGT1A1(Gly71Arg, TATA box) 다형성에 대한 연구

  • Lee, Jae Myoung (Department of Pediatrics, Sung-Ae General Hospital) ;
  • Han, Young Ji (Department of Pediatrics, Sung-Ae General Hospital) ;
  • Kim, Ji Sook (Department of Pediatrics, Sung-Ae General Hospital) ;
  • Kim, Eun Ryoung (Department of Pediatrics, Sung-Ae General Hospital)
  • 이재명 (성애병원 소아청소년과) ;
  • 한영지 (성애병원 소아청소년과) ;
  • 김지숙 (성애병원 소아청소년과) ;
  • 김은령 (성애병원 소아청소년과)
  • Received : 2007.09.10
  • Accepted : 2007.10.16
  • Published : 2008.02.15
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Abstract

Purpose : It has been known that breast milk cause prolonged unconjugated hyperbilirubinemia. UGT1A1 is a important gene of uridine diphosphate glucuronosyltransferase (UGT) which has a major role of bilirubin metabolism. These findings suggest that there is a relationship between UGT1A1 gene mutation and prolonged jaundice of breast feeding infant. The aim of study was to investigate whether a polymorphism of the UGT1A1 gene exist in prolonged hyperbilirubinemia of breast milk feeding Korean infant. Methods : The genomic DNA was isolated from 50 full term Korean neonates, who had greater than a 10 mg/dL of serem bilirubin after 2 weeks of birth with no significant cause, and the other genomic DNA was isolated from 162 full term Korean neonates of the control population. Both group fed breast milk. We performed direct sequencing of TATA box and Gly71Arg polymorphism of the UGT1A1 gene. Results : Two of the 50 neonates with hyperbilirubinemia had AA polymorphism, and 40 had GA polymorphism. Five of the 129 neonates of the control group had AA polymorphism, and 4 had GA polymorphism. The allele frequency of G>A polymorphism in the hyperbilirubinemia group was 44.0%; it was significantly higher than 5.4% of the control group. TATA box polymorpism was not different both group significantly. Conclusion : Our result indicated that Gly71Arg polymorphism is associated with the prolonged hyperbilirubinemia of breast milk-feeding infant in Korean, while TATA box polymorphism is not associated with the prolonged hyperbilirubinemia of breast milk-feeding infant in Korean.

목 적 : 모유 황달은 지속성 황달을 일으키는 중요한 원인이다. 모유 황달은 모유의 여러 가지 성분으로 인해 일어난다고 알려져 있지만 아직 그 원인이 명확하게 밝혀지지 않았으나 이전의 연구에서는 모유 황달이 가족력과 관계있다는 결과도 제시되었다. 이에 저자들은 신생아 황달을 가진 모유수유 환아들에서 Gly71Arg와 TATA box 유전자의 다형성을 조사한 후 이것이 한국인 신생아의 지속성 황달과 연관성이 있는지 알아보고자 본 연구를 시행하였다. 방 법 : 혈중 빌리루빈 수치가 10 mg/dL 이상의 건강하고 위험인자가 없는 모유수유를 시행한 만삭아 중 신생아 황달 환자 50명과 대조군 162명으로부터 혈액 0.5 cc를 채취하여 DNA를 분리하였고 TATA box와 Gly71Arg 유전자를 PCR 증폭하였다. 이를 염기서열 분석 방법을 통해 각 유전자의 다형성을 확인하였다. 결 과 : Gly71Arg 다형성은 환자군 50명 중 2명(4.0%)에서 AA로 40명(80.0%)은 GA로 나타났으며, 유전자가 분석된 대조군 129명 중 5명(3.9%)에서 AA로 4명(3.1%)은 GA로 나타났고, 대립유전자 빈도는 대조군에서 44.0% 환자군에서 5.5%로 나타났다(P=0.000001). TATA box는 환자군 50명 중 1명에서 $A(TA)_6TAA/A(TA)_7TAA$로 나타났으며 대조군에서 모두 $A(TA)_6TAA/A(TA)_6TAA$로 나타났다. 결 론 : 모유수유한 한국인 신생아 지속성 고빌리루빈혈증에서 UGT1A1의 Gly71Arg과 TATA box의 다형성을 확인하였으며, Gly71Arg 유전자의 다형성은 고빌리루빈혈증군에서 대조군에 비해 의미 있게 증가되어 모유수유한 한국인 신생아 지속성 고빌리루빈혈증과 연관이 있었고, TATA box의 다형성은 연관이 없었다.

Keywords

References

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