A Putative Cation Channel and Its Novel Regulator: Cross-Species Conservation of Effects on General Anesthesia
| Autor: | Terrance P. Snutch, Kevin S. Hamming, Howard A. Nash, Phil G. Morgan, John A. Humphrey, Margaret M. Sedensky, Robert L. Scott, Colin Thacker |
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| Rok vydání: | 2007 |
| Předmět: |
Mutant
Molecular Sequence Data Regulator Drug action Anesthesia General General Biochemistry Genetics and Molecular Biology Ion Channels MOLNEURO Enflurane 03 medical and health sciences 0302 clinical medicine Cytosol Animals Drosophila Proteins Caenorhabditis elegans Caenorhabditis elegans Proteins Gene Ion channel 030304 developmental biology Genetics 0303 health sciences biology Agricultural and Biological Sciences(all) Biochemistry Genetics and Molecular Biology(all) fungi Membrane Proteins biology.organism_classification Phenotype Biological Evolution 3. Good health Caenorhabditis Drosophila melanogaster Anesthesia Anesthetics Inhalation Mutation General Agricultural and Biological Sciences Halothane 030217 neurology & neurosurgery |
| Zdroj: | Current Biology. 17(7):624-629 |
| ISSN: | 0960-9822 |
| DOI: | 10.1016/j.cub.2007.02.037 |
| Popis: | Summary Volatile anesthetics like halothane and enflurane are of interest to clinicians and neuroscientists because of their ability to preferentially disrupt higher functions that make up the conscious state. All volatiles were once thought to act identically; if so, they should be affected equally by genetic variants. However, mutations in two distinct genes, one in Caenorhabditis and one in Drosophila , have been reported to produce much larger effects on the response to halothane than enflurane [1, 2]. To see whether this anesthesia signature is adventitious or fundamental, we have identified orthologs of each gene and determined the mutant phenotype within each species. The fly gene, narrow abdomen ( na ), encodes a putative ion channel whose sequence places it in a unique family; the nematode gene, unc-79 , is identified here as encoding a large cytosolic protein that lacks obvious motifs. In Caenorhabditis , mutations that inactivate both of the na orthologs produce an Unc-79 phenotype; in Drosophila , mutations that inactivate the unc-79 ortholog produce an na phenotype. In each organism, studies of double mutants place the genes in the same pathway, and biochemical studies show that proteins of the UNC-79 family control NA protein levels by a posttranscriptional mechanism. Thus, the anesthetic signature reflects an evolutionarily conserved role for the na orthologs, implying its intimate involvement in drug action. |
| Databáze: | OpenAIRE |
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