Genetic analysis of defecation in Caenorhabditis elegans.

Genetic analysis of defecation in Caenorhabditis elegans.
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秀丽隐杆线虫排便的遗传分析。

DOI:
10.1093/genetics/124.4.855
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发表时间:
1990
期刊:
影响因子:
3.3
通讯作者:
Thomas,JH
Thomas,JH
中科院分区:
生物学2区
文献类型:
--
作者:
Thomas,JH

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秀丽隐杆线虫的排便是通过一个周期性的定型运动程序来实现的。每个周期的第一步是收缩一组后体肌肉(pBoc),然后收缩一组前体肌肉(aBoc),最后收缩专门的肛门肌肉,打开肛门并排出肠内容物(Exp)。通过测试现有的行为突变体和筛选由于排便缺陷而便秘的新突变体,我已经确定了18个与排便有关的基因。其中16个基因的突变影响运动程序的特定部分:两个基因的突变专门影响pBoc步骤;四个基因的突变影响aBoc步骤;四个基因的突变影响Exp步骤;六个基因的突变影响aBoc和Exp。另外两个基因的突变影响排便周期,但具有正常的运动程序。还描述了调节野生型中的周期定时的感觉输入。排便突变体和双突变体的表型的基础上,我建议一个正式的遗传途径控制排便电机程序。
Defecation in the nematode Caenorhabditis elegans is achieved by a cyclical stereotyped motor program. The first step in each cycle is contraction of a set of posterior body muscles (pBoc), followed by contraction of a set of anterior body muscles (aBoc), and finally contraction of specialized anal muscles that open the anus and expel intestinal contents (Exp). By testing existing behavioral mutants and screening for new mutants that become constipated due to defects in defecation, I have identified 18 genes that are involved in defecation. Mutations in 16 of these genes affect specific parts of the motor program: mutations in two genes specifically affect the pBoc step; mutations in four genes affect the aBoc step; mutations in four genes affect the Exp step; and mutations in six genes affect both aBoc and Exp. Mutations in two other genes affect the defecation cycle period but have a normal motor program. Sensory inputs that regulate the cycle timing in the wild type are also described. On the basis of the phenotypes of the defecation mutants and of double mutants, I suggest a formal genetic pathway for the control of the defecation motor program.
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