配列の基準ではなく機能的基準によって識別されるβ-カテニンと,Wnt/MAPK信号伝達におけるその役割

Ambrose R Kidd¹, Jennifer A Miskowski, Kellee R Siegfried

¹Program in Cellular and Molecular Biology, University of Wisconsin-Madison, Wisconsin 53706, USA.

Cell

|June 7, 2005

まとめ

新型SYS-1遺伝子はベータ-カタニンとして作用し,C. elegansの発達における細胞運命を調節する. Wnt/MAPKのシグナリングはSYS-1レベルを制御し,遺伝子転写に影響を与え,動物の発達を通じて潜在的に保存されます.

科学分野:

発達生物学発達生物学について
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

Wnt信号伝達経路は,動物の発達に極めて重要です.
Wnt/MAPKシグナル伝達は,Wntシグナル伝達の一種で,細胞の運命決定に関与しています.
Wnt/MAPKシグナル伝達とともに,C. elegansの発達におけるsys-1遺伝子の役割は,以前は不明でした.

研究の目的:

C. elegansの発達におけるsys-1遺伝子の機能を調査する.
SYS-1がベータカタニンとして機能するかどうかを判断する.
SYS-1,POP-1/TCF,およびWnt/MAPKのシグナリングの関係を解明する.

主な方法:

バー-1/ベータ-カタニンヌル突然変異体を使った遺伝的救助実験.
POP-1/TCFタンパク質へのSYS-1結合の分析.
POP-1-依存トランスクリプションのSYS-1共活性化に関するアッセイ.
SYS-1レベルとPOP-1活動に関する遺伝子および分子解析.

主要な成果:

SYS-1タンパク質配列は新しいのですが,機能的にはβ-cateninとして作用します.
SYS-1はβ-カテニンのヌル変異体を救出し,POP-1/TCFに結合する.
SYS-1レベルはPOP-1の活動に極めて重要であり,Wnt/MAPKシグナリングがPOP-1の核輸出を制御することを示唆しています.
この発見は,正規および非正規のWnt信号伝達メカニズムをリンクしています.

結論:

SYS-1は,C. elegansの発達中のWnt/MAPKシグナル伝達に関与する新しいβ-カタニンである.
この発見は,β-カテニンの定義と,Wnt経路におけるその役割の定義を拡大する.
SYS-1/β-カタニンとWnt/MAPKのシグナル伝達を含む同様の発達経路は,他の動物でも保存されることがあります.

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