強化されたCpG変異性およびMBD4欠乏マウスの腫瘍発生

Catherine B Millar¹, Jacky Guy, Owen J Sansom

¹Wellcome Trust Centre for Cell Biology, The King's Buildings, Edinburgh University, Edinburgh EH9 3JR, UK.

Science (New York, N.Y.)

|July 20, 2002

まとめ

DNA修復タンパク質MBD4は,CpG部位から有害なウラシルとチミンを除去する. Mbd4欠乏したマウスは,CpG変異の増加と腫瘍形成の加速を示し,がん抑制におけるMBD4の役割を強調しています.

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
がん研究がん研究

背景:

哺乳類のタンパク質MBD4はメチル-CpG結合ドメインを有する.
MBD4は,CpGの不一致部位からのチミン (T) やウラシル (U) を酵素的に除去することができます. in vitro.
これらの機能は,体内で5メチルサイトシン変異性を最小限に抑えるためのMBD4の役割を示唆しています.

研究の目的:

CpG変異性を抑制するMBD4のインビボ機能を調査する.
MBD4欠乏が腫瘍発生に寄与するかどうかを判断する.

主な方法:

CpG変異の頻度を評価するために,Mbd4-/-マウスの分析.
Apc (Min/+) の背景でMbd4-/-マウスにおける腫瘍形成と変異プロファイルの評価.

主要な成果:

Mbd4-/-マウスは,CpG部位におけるC --> Tトランジションの3倍増加を示した.
腫瘍の発達の加速は,Mbd4-/-マウスで観察されました.
Apc遺伝子のCpG --> TpG変異は,Mbd4-/-マウスからの腫瘍で特定されました.

結論:

MBD4はCpGの変異性を in vivoで積極的に抑制する.
MBD4は,CpG変異を制限することによって,腫瘍発生を予防する上で重要な役割を果たします.

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