人間の腫瘍における神経線維症1遺伝子の体内変異
1Department of Human Genetics, University of Utah School of Medicine, Salt Lake City 84112.
Cell
|April 17, 1992
まとめ
ニューロフィブロマトーシス1 (NF1) 遺伝子の変異は,腫瘍を引き起こす可能性があります. 特定のNF1変異により,神経線維素タンパク質のLys-1423が変化し,その腫瘍抑制機能が損なわれ,様々な癌に寄与する.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- ニューロフィブロマトーシス1 (NF1) は,神経線維素をコードするNF1遺伝子の変異によって引き起こされます.
- ニューロフィブロミンのGTPase活性化タンパク質 (GAP) 関連ドメイン (NF1 GRD) は,細胞の成長と分化における重要な要因であるp21rasを調節する.
- 変異性ニューロフィブロミンによるrasシグナル伝達経路の調節障害は,腫瘍の発達に関与しています.
研究 の 目的:
- NF1 GRDにおける特定のアミノ酸置換 (Lys-1423) の機能的影響を調査する.
- この変異がNF1患者および散発性腫瘍の腫瘍発育に寄与するかどうかを判断する.
主な方法:
- NF1 GRDのGTPase活性化タンパク質 (GAP) の活性に関する分析.
- 変異したNF1GRDのp21ras.への結合親和性の評価.
- 腫瘍サンプルをLys-1423変異の有無に検査する.
主要な成果:
- NF1 GRD.では特定のアミノ酸置換 (Lys-1423) が特定されました.
- 変異したNF1GRDは,野生型と比較してGAPの活性が著しく低下 (200〜400倍低い) した.
- この変異は,大腸腺癌,骨髄膜症候群,アナプラスティック・アストロサイトーマ,および神経線維腫1の家族で発見されました.
- 変異したNF1GRDのp21rasへの結合親和性は影響を受けませんでした.
結論:
- 神経線維腫症1を引き起こす生殖系NF1変異は,体内でも発生することがあります.
- NF1 GRDの特定された変異は,その腫瘍抑制機能を損なう.
- この体的変異は,NF1.1と典型的に関連していない腫瘍を含む,散発的な腫瘍の発生に寄与する.
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