染色体21と22における大規模な転写活動

Philipp Kapranov¹, Simon E Cawley, Jorg Drenkow

¹Affymetrix, Santa Clara, CA 95051, USA., National Cancer Institute, Bethesda, MD 20892, USA.

Science (New York, N.Y.)

|May 4, 2002

まとめ

研究者らは,ヒト染色体21と22の活性RNA転写をマッピングした. 彼らは,既知の遺伝子エクソンが予測していたよりも,かなり多くのゲノム配列が転写されていることを発見しました.

科学分野:

ゲノミクスゲノミクスとは
分子生物学は分子生物学である.
人間の遺伝学人間の遺伝学

背景:

人間の染色体21と22には,約770の特徴づけられた,予測された遺伝子が含まれています.
遺伝子発現と転写活動の理解は,ゲノム機能を理解するために重要である.

研究の目的:

人間の染色体21と22の活性RNA転写部位の経験的地図を作成する.
ゲノム転写の範囲を既存の配列アノテーションと比較する.

主な方法:

11種類のヒトの細胞系から採取した細胞性ポリアデニル化RNAを用いた.
高解像度マッピングのために~35の塩基対間隔でプローブを持つオリゴヌクレオチド配列を使用しました.
染色体21と22のトランスクリプション領域をマッピングしました.

主要な成果:

染色体21と22の活性RNA転写の詳細なマップを生成しました.
ゲノム配列の著しく大きな部分が,既知のエクソンが占めるよりも以前に転写されていることを確認しました.
アノテーションされたエクソンが予測するよりも,数桁の大きさのトランスクリプション活動が観察されました.

結論:

人間のゲノム,特に21番と22番の染色体は,現在注釈されているよりも高いレベルの転写活性を示しています.
現在の遺伝子アノテーションモデルは,これらの染色体内の機能的複雑性と規制要素を過小評価している可能性があります.
これらの新たに特定された転写された領域の機能と重要性を特徴付けるために,さらなる調査が必要である.

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