Expression of Tbx6 in paraxial mesoderm
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Tbx6 is expressed in the primitive streak and then expression continues in the paraxial mesoderm (Chapman et al. 1996). Notch signaling acting through Rbpj activates expression of Tbx6 in paraxial mesoderm (White et al. 2005). Wnt signaling (Dunty et al. 2008, Nowotschin et al. 2012) and Fgf signaling (Ciruna and Rossant 2001) also directly or indirectly activate expression of Tbx6 in paraxial mesoderm. Tbxt is not required for initial activation of Tbx6 expression, but Tbxt is required for maintenance of Tbx6 expression (Chapman et al. 1996). Mesogenin1 (Msgn1), which is itself activated by Tbx6, activates Tbx6 in a reinforcing loop (Chalamalasetty et al. 2014).
Tbx6基因在原始条形索中表达,随后在旁轴中胚层中持续表达(Chapman 等,1996年)。通过Rbpj激活的Notch信号(White 等,2005年)能够直接或间接地激活旁轴中胚层中Tbx6的表达。Wnt信号(Dunty 等,2008年,Nowotschin 等,2012年)和Fgf信号(Ciruna 和 Rossant,2001年)亦能直接或间接地激活旁轴中胚层中Tbx6的表达。Tbxt对于Tbx6表达初始激活并非必需,但Tbxt对于Tbx6表达维持至关重要(Chapman 等,1996年)。Mesogenin1(Msgn1),其自身被Tbx6激活,通过正反馈环激活Tbx6(Chalamalasetty 等,2014年)。
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