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MEX-3是一种KH域蛋白质,它调节了早期C. elegans胚胎中的囊原体身份

B W Draper¹, C C Mello, B Bowerman

¹Department of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA.

|October 18, 1996

概括

mex-3基因的突变使C. elegans胚胎的前细胞能够发展肌肉,这种命运通常仅限于后细胞. 这表明mex-3调节基因表达,以建立细胞命运差异.

科学领域:

发展生物学发展生物学
遗传学是一个遗传学.
分子生物学分子生物学

背景情况:

早期的C. elegans胚胎表现出不对称的细胞分裂,导致截然不同的前置和后置芽细胞体.
后部胚芽细胞通常会产生肌肉细胞,而前部胚芽细胞不会.

研究的目的:

研究mex-3基因在C. elegans胚胎中建立前后发育不对称性的作用.
了解mex-3如何影响胚胎第一次分裂后的细胞命运决定.

主要方法:

在Mex-3基因中对母亲效应致命突变的分析.
在Mex-3突变体中前额叶芽细胞的后裔中观察肌肉发育模式.
早期胚胎中MEX-3蛋白分布的特征及其与P颗粒的关联.

主要成果:

在mex-3中发生的母性效应突变导致前叶芽细胞的后代形成肌肉,模仿后叶细胞的发育.
mex-3基因编码了一个可能的RNA结合蛋白,在早期胚胎中分布不均.
MEX-3局部存在于P颗粒中,P颗粒是生殖系特有的结构.

结论:

在C. elegans中,MEX-3在保持前后发育不对称方面发挥着至关重要的作用.
MEX-3可能通过调节特定的信使RNAs (mRNAs) 来起作用,这些RNAs决定后部细胞的命运.
蛋白质的定位和功能表明一种控制基因表达的机制,以指定不同的细胞系.

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