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Bacterial Phylum Spirochaetes
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cdx4変異体は血の祖先を特定できず,複数のホックス遺伝子によって救出されることがあります
Alan J Davidson1, Patricia Ernst, Yuan Wang
1Department of Medicine, Division of Hematology/Oncology, Children's Hospital and Dana-Farber Cancer Institute, Howard Hughes Medical Institute, Boston, Massachusetts 02115, USA.
Nature
|September 19, 2003
まとめ
斑馬魚の遺伝子cdx4は,血液細胞の発達と胚のパターニングに不可欠です. cdx4の突然変異は,ホックス遺伝子発現を変化させ,脊椎動物の胚形成におけるその役割を強調することによって,血液形成性幹細胞の形成を妨げます.
科学分野:
- 発達生物学 発達生物学とは
- 遺伝学 遺伝学とは
- ヘマトポエーシス (血液形成) とは
背景:
- オルガノゲネシスは,細胞のタイプ差異化に依存しています.
- ホックス遺伝子は,前後軸に沿って位置的アイデンティティを確立します.
- ゼブラフィッシュの変異体は,発達障害を研究するためのモデルを提供します.
研究 の 目的:
- ゼブラフィッシュ変異クゲリグ (kgg) の遺伝子を特定する.
- cdx4が血液形成および前後部形成における役割を研究する.
- cdx4,ホックス遺伝子,および血液細胞の運命の仕様との関係を明らかにする.
主な方法:
- ゼブラフィッシュの遺伝子スクリーンは,ミュータントを識別する.
- 遺伝子発現分析 (ホックス遺伝子).
- 遺伝子の過剰発現 (hoxb7a,hoxa9a,hoxb8a,scl,cdx4) を含む救出実験を行った.
- マウスの胚性幹細胞の研究.
主要な成果:
- kgg変異は,尾関節に関連する遺伝子cdx4.4の欠陥によって引き起こされます.
- kggミュータントは早期の造血欠陥と異常な前後部パターンを表しており,ホックス遺伝子発現が変化している.
- 特定のホックス遺伝子 (hoxb7a,hoxa9a) の過剰発現は,kgg胚の血液欠乏症を救済した.
- cdx4過剰発現は,ゼブラフィッシュとマウスの胚性幹細胞で血液形成を誘発し,ホックス遺伝子発現を調節した.
結論:
- cdx4はホックス遺伝子発現を調節する.
- cdx4は,脊椎動物の発達中の血液形成細胞運命を指定するために不可欠です.
- cdx4とHOX遺伝子は,血の発達のための後部のメソデームの能力を確立するために協力します.
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