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The Amount of Telomeres and Telomerase Activity on Chicken Embryonic Cells During Developmental Stages

닭의 발생 단계별 세포내 Telomere의 양적 분포양상과 Telomerase 활성도 분석

  • Cho, E.J. (Department of Animal Science and Technology & RAIRC, Jinju National University) ;
  • Choi, C.H. (National Livestock Research Institute, RDA) ;
  • Sohn, S.H. (Department of Animal Science and Technology & RAIRC, Jinju National University)
  • 조은정 (진주산업대학교 동물생명과학과.동물생명산업연구센터) ;
  • 최철환 (농진청 축산연구소) ;
  • 손시환 (진주산업대학교 동물생명과학과.동물생명산업연구센터)
  • Published : 2005.04.30

Abstract

Telomeres locate at the end of chromosomes and consist of a tandem repeat sequence of $(TIAGGG)^{n}$ and associated proteins. Telomerase is a ribonucleoprotein which act as a template for the synthesis of telomeric DNA. Telomeres are essential for chromosome stability and are related with cell senescence, apoptosis and cancer. This study was carried out to analyze the amount of telomeres and telomerase activity of chicken cells during embryonic and developmental stages. The whole embryos and prenatal tissues such as brain, heart, liver, kidney and testis at different developmental stages were obtained from Korean Native Chicken. The amount of telomeres on embryonic cells was analyzed by quantitative fluorescence in situ hybridization (Q-FISH) techniques using the chicken telomeric DNA probe. Telomerase activity was measured by telomeric repeat amplification protocol (TRAP) assay. Results indicated that the amounts of telomeric DNA on the most embryonic cells were gradually decreased during ontogenesis. Furthermore, the quantity of telomeres was quite different among embryonic tissues according to developmental origin. The relative amount of telomeres has more in regenerative cells such as embryonic disc and testicular cells than in non-regenerative cells such as liver, brain, heart and kidney cells. Telomerase activity was also highly detectable in most chicken cells at early embryonic stages. After 9 days of incubation, however, the telomerase activitie W

Keywords

References

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