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Cancers Originate from Somatic Mutations in a Single Cell02:21

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Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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Cancers Originate from Somatic Mutations in a Single Cell02:21

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No description available
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Tumor Progression02:07

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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
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ソマティック変異は,肺アデノカルシノーマの重要な経路に影響します.

Li Ding1, Gad Getz, David A Wheeler

  • 1The Genome Center at Washington University, Department of Genetics, Washington University School of Medicine, St Louis, Missouri 63108, USA.

Nature
|October 25, 2008
PubMed
まとめ

研究者らは,肺アデノカルシノーマ188種で1,000以上の体変異を発見し,がん発症に関与する可能性が高い26の頻繁に変異した遺伝子を特定しました. これらの発見は,肺がん治療のための新しい分子標的を提供する.

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科学分野:

  • 腫瘍学 腫瘍学
  • 遺伝学 遺伝学とは
  • 分子生物学は分子生物学である.

背景:

  • 癌の遺伝的基盤を理解するには,大規模な腫瘍の収集を分析する必要があります.
  • 肺アデノカルシノーマは,がんに関連する死亡の主な原因であり,より深い遺伝的洞察を必要とします.

研究 の 目的:

  • 主要肺アデノカルシノーマの体内変異を特定するために.
  • 肺腺癌で頻繁に変異する遺伝子を発見し,がん発生におけるそれらの潜在的な役割.
  • 変異プロフィールを臨床的特徴とDNA修復欠陥と相関させる.

主な方法:

  • 188の原発性肺アデノカルシノーマにおける623の癌に関連する遺伝子の包括的なDNAシーケンシング.
  • 有意に変異した遺伝子を特定するための統計分析.
  • シングルヌクレオチドポリモルフィズム配列と遺伝子発現配列データによるデータ統合.

主要な成果:

  • サンプル全体で1,000以上の体性変異が特定されました.
  • タイロシンキナーゼ (ERBB4,EPHA3,KDR,NTRK) を含む26の遺伝子が頻繁に変異しました.
  • ソマティック突然変異は,既知の腫瘍抑制遺伝子 (NF1,APC,RB1,ATM) および他の遺伝子 (PTPRD,LRP1B) で発見されました.
  • 臨床的特徴,喫煙状態,DNA修復欠陥と相関する変異プロファイル.

結論:

  • この研究では,肺アデノカルシノーマ発症に関与する重要なシグナル伝達経路を特定しました.
  • 頻繁に変異した遺伝子は,新しい肺がん治療のための潜在的な分子標的を表しています.
  • 遺伝的変異は,肺アデノカルシノーマの病原性についての洞察を提供します.