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鼠标的同源性因霍克斯-3.1基因的零突变引起的
H Le Mouellic1, Y Lallemand, P Brûlet
1Unité de Génétique Cellulaire Collège de France l'Institut Pasteur, URA 1148 du CNRS, Paris, France.
Cell
|April 17, 1992
概括
缺少霍克斯-3.1基因的零突变小鼠在干部表现出骨转变,表明细胞身份改变而不是位置. 这些发现揭示了胚胎发育中的同源基因功能.
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:
- 同源基因,如霍克斯基因,在胚胎发育过程中在建立细分身份方面发挥着至关重要的作用.
- 霍克斯-3.1基因是霍克斯基因集群的一部分,其在哺乳动物发育中的特定功能需要阐明.
研究的目的:
- 通过创建零突变来研究霍克斯-3.1基因在哺乳动物发育中的功能.
- 确定霍克斯-3.1功能丧失对小鼠骨发育和细胞识别的影响.
主要方法:
- 在胚胎干细胞中使用同源重组,用大肠杆菌 lacZ 基因取代 Hox-3.1 编码序列.
- 产生了零突变小鼠 (同位素和异位素) 并对表型异常进行分析,特别是在骨发育方面.
- 作为标记,Beta-galactosidase活性被用来可视化Hox-3.1位点的表达模式.
主要成果:
- 双胞胎性Hox-3.1无突变小鼠出生,但显示活力降低,大多数出生后不久就死亡.
- 在同卵性动物的干部区域观察到显著的骨转变,更像前部段.
- 具体的转变包括将第八条肋骨对附在胸骨上,并在第一个腰椎上形成第14条肋骨对.
- 异构体和同构体中的β-银酸酶表达模式准确地反映了内源性Hox-3.1表达模式.
结论:
- 霍克斯-3.1基因对于保持胚胎细胞在干部区域的正确身份至关重要.
- 失去Hox-3.1的功能导致了同源性转变,改变了骨部分的身份,而不是细胞位置.
- 这项研究提供了对霍克斯基因在脊椎动物轴向模式和细分规范中的作用的关键见解.
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