Korean Journal of Poultry Science (한국가금학회지)

The Korean Society of Poultry Science (한국가금학회)
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Effect of Maternal Age on Chromosome Aberrations and Telomere Quantity in Chick Embryos

닭의 모체 연령에 따른 생산 배아의 염색체 이상 빈도 및 텔로미어 함량 분석

  • Lee, Soo-Hee (Department of Animal Science and Biotechnology, Jinju National University) ;
  • Subramani, Vinod K. (Department of Animal Science and Biotechnology, Jinju National University) ;
  • Sohn, Sea-Hwan (Department of Animal Science and Biotechnology, Jinju National University)
  • 이수희 (진주산업대학교 동물생명과학과) ;
  • ;
  • 손시환 (진주산업대학교 동물생명과학과)
  • Published : 2009.12.31
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Abstract

The rate of fetus with abnormal chromosomes increase with maternal age. Nondisjunction of aging oocyte chromosome is a major reason for the increased rate of abnormalities. Telomeres are the ends of eukaryotic chromosome, which are essential for chromosome stability and are related in cell senescence. This study was carried out to analyze the chromosome aberration rate and amount of telomeric DNA in chick embryo along with maternal age. Fertilized eggs and blood were sampled from White Leghorn layers starting at 20 weeks through to 70 weeks age at 10 weeks interval. Chromosome aberration rate was analyzed by karyotyping. The amounts of telomeric DNA in embryonic cells and lymphocytes were quantified by Quantitative Fluorescence in situ Hybridization method. The chromosome aberration rate in chick embryos significantly differed with maternal age. The chromosome aberration rate increased at early laying period and beyond 70 weeks of maternal age. Therefore, chromosome aberration rate was affected by maternal age due to ovulated oocytes state. However, the amount of telomeric DNA on embryonic cells did not differ significantly with maternal age. Thus, maternal age does not affects telomere quantity in their embryos due to cellular reprograming at early embryonic stage after fertilization.

모체 출산 연령이 늦어짐에 따라 태아의 염색체 이상 빈도는 증가하는 것으로 알려져 있는데, 이는 난자의 노화에 따른 염색체의 비분리 현상의 증가 등이 주된 원인이다. 염색체 양 말단에 존재하는 텔로미어는 염색체의 안정성에 관여하고 세포분열이 진행됨으로써 이의 길이가 짧아져 노화의 지표로 활용되고 있다. 따라서 본 연구는 모체의 노화가 생산 배아에 미치는 영향을 알아보기 위하여 닭의 산란 연령별 배아의 염색체 이상 빈도와 이들의 텔로미어 함량을 분석하였다. 시험 분석은 20주령에서부터 70주령까지의 화이트 레그혼 종을 공시하고 10주 간격으로 생산된 수정란의 초기 배아에 대한 핵형 분석과 양적형광보인법(Q-FISH)을 이용한 모계 및 생산 배아의 텔로미어 함량을 분석하였다. 분석 결과, 초기 배아의 염색체 이상 빈도는 산란 연령에 따른 유의적인 차이가 있었는데, 산란 초기에 상대적으로 높은 염색체 이상 빈도를 보이다가 산란 중기에서 안정된 빈도를 유지하고, 후기부터 다시 이상 빈도가 증가하는 양상을 보여 모체의 노화가 태아의 염색체 이상 빈도에 영향을 미치는 것으로 나타났다. 개체의 텔로미어 함량은 연령이 증가함에 따라 점진적 감소 양상을 나타내는 반면, 모계 연령에 따른 생산 배아들의 텔로미어 함량은 연령 간에 차이가 없는 것으로 나타나 모체의 노화가 수정 배아의 텔로미어 함량에는 영향을 미치지 않는 것으로 보여진다. 이는 배란 후 수정이 된 배아는 초기 발생 과정 중 세포들의 reprograming이 일어나 텔로미어가 복구됨을 의미한다.

Keywords

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