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Caenorhabditis elegans mutants defective in the functioning of the motor neurons responsible for egg laying.

Genetics. 1989 Apr;121(4):703-21. doi:10.1093/genetics/121.4.703
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摘要


We have isolated and characterized 45 Caenorhabditis elegans mutants presumed to be defective in the functioning of the hermaphrodite-specific neurons (HSNs). Like hermaphrodites that lack the HSN motor neurons, these mutants are egg-laying defective and do not lay eggs in response to exogenous imipramine but do lay eggs in response to exogenous serotonin. Twenty of the 45 mutations define 10 new egl genes; the other 25 mutations are alleles of five previously defined genes, four of which are known to affect the HSNs. Seven mutations in three genes cause the HSNs to die in hermaphrodites, as they normally do in males. These genes appear to be involved in the determination of the sexual phenotype of the HSNs, and one of them (egl-41) is a newly identified gene that may function generally in sex determination. Five of the 15 genes are defined only by mutations that have dominant effects on egg laying. One gene egl(n1108), is defined by a temperature-sensitive allele that has a temperature-sensitive period after HSN development is complete, suggesting that egl(n1108) may be involved in HSN synaptic transmission. Four of the genes are defined by single alleles, which suggests that other such genes remain to be discovered. Mutations in no more than 4 of the 15 genes specifically affect the HSNs, indicating that there are few genes with functions needed only in this single type of nerve cell.

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