コメントへの返信 "DNAの損傷は,配列の誤差の蔓延的な原因であり,直接変種識別を混乱させる"
Lixin Chen1, Pingfang Liu1, Thomas C Evans2
1New England Biolabs Inc., Ipswich, MA 01938, USA.
まとめ
DNAの損傷,特に酸化による損傷は,がんゲノムアトラス (TCGA) のデータにおける変異検出の正確性に影響します. これは癌ゲノム研究における体的変異の特定の信頼性に影響する.
科学分野:
- ゲノミクス
- バイオ情報学
- 癌 研究
背景:
- 体の変異を正確に特定することは,がんの発症を理解するために極めて重要です.
- DNA損傷は配列データにアーティファクトを導入し,潜在的に変異検出を混乱させる可能性があります.
- 過去の分析では,全てのDNA損傷の原因が 完全には説明されなかったかもしれない.
研究 の 目的:
- 癌ゲノムアトラス (TCGA) のデータを用いて,DNA損傷による変異の影響を再評価する.
- ゲノムシーケンシングデータにおける酸化ダメージに関する発見を確認する.
- シーケンシングの日付と文脈が変異検出の正確性に与える影響を評価する.
主な方法:
- TCGAの配列データを再分析する.
- スチュワートらによって提案された特定のパラメータの適用.
- オキシダティブダメージの兆候のシーケンス文脈の検査
主要な成果:
- 分析されたすべてのシーケンスの中で酸化的損傷が検出されました.
- 配列決定の日付に関係なく,酸化ダメージの証拠は存在しました.
- 発見はDNA損傷が 変異呼び出しパイプラインを 損なうことを再確認します
結論:
- DNAの損傷,特に酸化的損傷は,体的変異の識別の正確さに影響する重要な要因です.
- 変異を誘発するパイプラインは DNAの損傷を 正確に説明する必要があります
- 信頼性の高いがんゲノム解析には,バイオ情報学のツールのさらなる最適化が必要である.
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Overview of DNA Repair
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...


