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ネズミのテロメア特異性クロマチンの核群組織
V L Makarov1, S Lejnine, J Bedoyan
1Department of Biological Sciences, University of Michigan, Ann Arbor 48109-2099.
Cell
|May 21, 1993
まとめ
哺乳類のテロメアは,染色体の保護キャップであり,大量クロマチンのように,ニュクレオソームのように構造されています. これは,テロメアにこの核細胞組織が欠けている下層の真核生物と対照的です.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- テロメアは,真核染色体の末端にある重要な保護構造です.
- 哺乳類のテロメアの構造的組織,特にクロマチンとの関係は,依然として研究分野です.
研究 の 目的:
- ネズミの肝臓の核体構造を研究するために,染色体テロメアをインターフェーズする.
- テロメアクロマチンの構造を,バルククロマチンと低微生物のテロメアと比較する.
主な方法:
- 孤立した核のマイクロコックスの核酵素の消化.
- 結果となる粒子のサクラロース・グラデーション沈殿分析.
- 核タンパク質とDNAゲルの電解.
- DNAアゼI 消化と分析.
主要な成果:
- ネズミの肝臓のテロメアは20~100kbの長さで,マイクロコックスの核酵素の消化時に157bpの周期性を示し,オリゴヌクレオソームに似た粒子を形成する.
- モノメアテロメア粒子は核細胞核粒子と共移動するが,ヒストンH1.1と結合しない.
- DNAase I 消化により,テロメア核タンパク質の ~10.4 bp の間隔が明らかになり,大量核細胞を反映しています.
- ヒストンH1の除去は,大量クロマチンのようにテロメア沈殿に影響します.
結論:
- 哺乳類のテロメアは,大量クロマチンに類似して,密接に距離を置く核細胞に編成されています.
- テロメアのこの核体組織は,下層のエウカリオットで観察されるそのような構造の欠如とは異なる.
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