トランスクリプトーム全体のノイズ制御は,哺乳類の祖先細胞における系統選択を制御する
Hannah H Chang1, Martin Hemberg, Mauricio Barahona
1Vascular Biology Programme, Department of Pathology and Surgery, Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|May 24, 2008
まとめ
幹細胞の細胞個性は,ランダムなノイズではなく,ゆっくりとした遺伝子発現の変動から生じる. これらのメタスタブル状態は,細胞の運命決定に影響を与え,血液形成の原始細胞における系統のコミットメントに影響を与えます.
科学分野:
- 発達生物学 発達生物学について
- 幹細胞生物学 幹細胞生物学
- 遺伝学 遺伝学とは
背景:
- クローン集団におけるフェノタイプの細胞間変異性は,遺伝子発現ノイズや安定した変異から生じる可能性があります.
- 非遺伝的細胞の個性は,哺乳類の細胞のタンパク質レベルの緩やかな変動から生じ,異質性を生み出します.
- ストキャスティック幹細胞の運命決定におけるこの異質性の役割はよく理解されていません.
研究 の 目的:
- 非遺伝的細胞の個性が,幹細胞におけるストキャスティック細胞運命を決定することに寄与するかどうかを調査する.
- ネズミの血液型原始細胞のクローン集団における遺伝子発現の変動の動態を特徴づける.
主な方法:
- クローンマウスの血液生成原始細胞におけるSca-1 (Ly6a) 発現の異常値の分析.
- Sca-1アウトラー細胞のトランスクリプトーム分析.
- ガウス混合モデルを使用して,遺伝子発現のリラックスダイナミクスのモデリング.
主要な成果:
- 自発的なSca-1発現の異常値は,親分布に遡って,ゆっくりとしたリラックスダイナミクス (>1週間) を示した.
- アウトリア細胞は,異なったトランスクリプトームを持ち,遺伝的でない個性を示す.
- これらの特異的なトランスクリプトームは,一時的なものではあるが,特定の転写因子発現 (Gata1, PU.1) と関連付けられている,赤色線維細胞または骨髄細胞の運命に対する系統のコミットメントに影響を与えました.
結論:
- 遺伝子発現におけるクローン異質性は,独立した遺伝子ノイズではなく,転移性トランスクリプトーム状態を反映しています.
- これらのゆっくりと変動する,明確な細胞状態は,ストキャスティックな細胞運命を決定するための多能原始細胞の可逆的なプライミングを制御します.
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