RRC ID 46575
Author Chatzigeorgiou M, Grundy L, Kindt KS, Lee WH, Driscoll M, Schafer WR.
Title Spatial asymmetry in the mechanosensory phenotypes of the C. elegans DEG/ENaC gene mec-10.
Journal J Neurophysiol
Abstract DEG/ENaC channels have been broadly implicated in mechanosensory transduction, yet many questions remain about how these proteins contribute to complexes that sense mechanical stimuli. In C. elegans, two DEG/ENaC channel subunits are thought to contribute to a gentle touch transduction complex: MEC-4, which is essential for gentle touch sensation, and MEC-10, whose importance is less well defined. By characterizing a mec-10 deletion mutant, we have found that MEC-10 is important, but not essential, for gentle touch responses in the body touch neurons ALM, PLM, and PVM. Surprisingly, the requirement for MEC-10 in ALM and PLM is spatially asymmetric; mec-10 animals show significant behavioral and physiological responses to stimulation at the distal end of touch neuron dendrites, but respond poorly to stimuli applied near the neuronal cell body. The subcellular distribution of a rescuing MEC-10::GFP translational fusion was found to be restricted to the neuronal cell body and proximal dendrite, consistent with the hypothesis that MEC-10 protein is asymmetrically distributed within the touch neuron process. These results suggest that MEC-10 may contribute to only a subset of gentle touch mechanosensory complexes found preferentially at the proximal dendrite.
Volume 104(6)
Pages 3334-44
Published 2010-12-1
DOI 10.1152/jn.00330.2010
PII jn.00330.2010
PMID 20881202
PMC PMC3007656
MeSH Alleles Animals Animals, Genetically Modified Caenorhabditis elegans / genetics Caenorhabditis elegans / physiology* Caenorhabditis elegans Proteins / genetics Caenorhabditis elegans Proteins / physiology* Calcium / analysis Dendrites / chemistry Gene Deletion Green Fluorescent Proteins / analysis Mechanotransduction, Cellular / physiology* Membrane Proteins / deficiency Membrane Proteins / genetics Membrane Proteins / physiology* Recombinant Fusion Proteins / analysis Sensory Receptor Cells / physiology* Sensory Receptor Cells / ultrastructure Subcellular Fractions / chemistry Touch / physiology*
IF 2.234
Times Cited 15
C.elegans tm1552