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Mutations in the Caenorhabditis elegans gene mec-8 were previously shown to cause defects in mechanosensation and in the structure and dye filling of certain chemosensory neurons. Using noncomplementation screens, we have identified eight new mec-8 alleles and a deficiency that uncovers the locus. Strong mec-8 mutants exhibit an incompletely penetrant cold-sensitive embryonic and larval arrest, which we have correlated with defects in the attachment of body muscle to the hypodermis and cuticle. Mutations in mec-8 strongly enhance the mutant phenotype of unc-52(viable) mutations; double mutants exhibit an unconditional arrest and paralysis at the twofold stage of embryonic elongation, a phenotype characteristic of lethal alleles of unc-52, a gene previously shown to encode a homolog of the core protein of heparan sulfate proteoglycan, found in basement membrane, and to be involved in the anchorage of myofilament lattice to the muscle cell membrane. We have identified and characterized four extragenic recessive suppressors of a mec-8; unc-52(viable) synthetic lethality. The suppressors, which define the genes smu-1 and smu-2, can weakly suppress all mec-8 mutant phenes. They also suppress the muscular dystrophy conferred by an unc-52(viable) mutation.

The mec-8 gene of Caenorhabditis elegans affects muscle and sensory neuron function and interacts with three other genes: unc-52, smu-1 and smu-2.