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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kim, Hung J. Vogt, Thomas F. Noben-trauth, Konrad Kachar, Bechara Belyantseva, Inna A. Di Palma, Federica |
| Description | Author Affiliation: Di Palma F ( Section on Neurogenetics, Laboratory of Molecular Biology, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, 5 Research Court, Rockville, MD 20850, USA.); |
| Abstract | Deafness in spontaneously occurring mouse mutants is often associated with defects in cochlea sensory hair cells, opening an avenue to systematically identify genes critical for hair cell structure and function. The classical semidominant mouse mutant varitint-waddler (Va) exhibits early-onset hearing loss, vestibular defects, pigmentation abnormalities, and perinatal lethality. A second allele, Va(J), which arose in a cross segregating for Va, shows a less severe phenotype. By using a positional cloning strategy, we identify two additional members of the mucolipin gene family (Mcoln2 and Mcoln3) in the 350-kb Va(J) minimal interval and provide evidence for Mcoln3 as the gene mutated in varitint-waddler. Mcoln3 encodes a putative six-transmembrane-domain protein with sequence and motif similarities to the family of nonselective transient-receptor-potential (TRP) ion channels. In the Va allele an Ala419Pro substitution occurs in the fifth transmembrane domain of Mcoln3, and in Va(J), a second sequence alteration (Ile362Thr) occurring in cis partially rescues the Va allele. Mcoln3 localizes to cytoplasmic compartments of hair cells and plasma membrane of stereocilia. Hair cell defects are apparent by embryonic day 17.5, assigning Mcoln3 an essential role during early hair cell maturation. Our data suggest that Mcoln3 is involved in ion homeostasis and acts cell-autonomously. Hence, we identify a molecular link between hair cell physiology and melanocyte function. Last, MCOLN2 and MCOLN3 are candidate genes for hereditary and/or sporadic forms of neurosensory disorders in humans. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 99 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2002-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Deafness Genetics Membrane Proteins Mutagenesis Pigmentation Disorders Proteins Amino Acid Sequence Animals Binding Sites Chromosomes, Artificial, Bacterial Cochlea Abnormalities Crosses, Genetic DNA Primers Disease Models, Animal Gene Library Hair Cells, Auditory Mice Mice, Inbred C3H Mice, Inbred C57BL Mice, Inbred Strains Mice, Mutant Strains Molecular Sequence Data Sequence Alignment Sequence Homology, Amino Acid TRPM Cation Channels Transient Receptor Potential Channels Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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