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The Caenorhabditis elegans unc-93 gene encodes a putative transmembrane protein that regulates muscle contraction.

J. Cell Biol.1992 Apr;117(1):143-55. doi:10.1083/jcb.117.1.143
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摘要


unc-93 is one of a set of five interacting genes involved in the regulation or coordination of muscle contraction in Caenorhabditis elegans. Rare altered-function alleles of unc-93 result in sluggish movement and a characteristic "rubber band" uncoordinated phenotype. By contrast, null alleles cause no visibly abnormal phenotype, presumably as a consequence of the functional redundancy of unc-93. To understand better the role of unc-93 in regulating muscle contraction, we have cloned and molecularly characterized this gene. We isolated transposon-insertion alleles and used them to identify the region of DNA encoding the unc-93 protein. Two unc-93 proteins differing at their NH2 termini are potentially encoded by transcripts that differ at their 5' ends. The putative unc-93 proteins are 700 and 705 amino acids in length and have two distinct regions: the NH2 terminal portion of 240 or 245 amino acids is extremely hydrophilic, whereas the rest of the protein has multiple potential membrane-spanning domains. The unc-93 transcripts are low in abundance and the unc-93 gene displays weak codon usage bias, suggesting that the unc-93 protein is relatively rare. The unc-93 protein has no sequence similarity to proteins listed in current data-bases. Thus, unc-93 is likely to encode a novel membrane-associated muscle protein. We discuss possible roles for the unc-93 protein either as a component of an ion transport system involved in excitation-contraction coupling in muscle or in coordinating muscle contraction between muscle cells by affecting the functioning of gap junctions.

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