Spatiotemporal pattern and isoforms of cadherin 23 in wild type and waltzer mice during inner ear hair cell development.

Mutant alleles of the gene encoding cadherin 23 are associated with Usher syndrome type 1 (USH1D), isolated deafness (DFNB12) in humans, and deafness and circling behavior in waltzer (v) mice. Stereocilia of waltzer mice are disorganized and the kinocilia misplaced, indicating the importance of cadherin 23 for hair bundle development. Cadherin 23 was localized to developing stereocilia and proposed as a component of the tip link. We show that, during development of the inner ear, cadherin 23 is initially detected in centrosomes at E14.5, then along the length of emerging stereocilia, and later becomes concentrated at and subsequently disappears from the tops of stereocilia. In mature vestibular hair bundles, cadherin 23 is present along the kinocilium and in the region of stereocilia-kinocilium bonds, a pattern conserved in mammals, chicks, and frogs. Cadherin 23 is also present in Reissner's membrane (RM) throughout development. In homozygous v(6J) mice, a reported null allele, cadherin 23 was absent from stereocilia, but present in kinocilia, RM, and centrosomes. We reconciled these results by identifying two novel isoforms of Cdh23 unaffected in sequence and expression by the v(6J) allele. Our results suggest that Cdh23 participation in stereocilia links may be restricted to developing hair bundles.
AuthorsAyala Lagziel, Zubair M Ahmed, Julie M Schultz, Robert J Morell, Inna A Belyantseva, Thomas B Friedman
JournalDevelopmental biology (Dev Biol) Vol. 280 Issue 2 Pg. 295-306 (Apr 15 2005) ISSN: 0012-1606 [Print] United States
PMID15882574 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)
Chemical References
  • CDH23 protein, human
  • Cadherins
  • Cdh23 protein, mouse
  • DNA, Complementary
  • Protein Isoforms
  • Alleles
  • Animals
  • Blotting, Northern
  • Blotting, Western
  • Cadherins (biosynthesis, chemistry, metabolism)
  • Cell Adhesion
  • Centrosome (metabolism)
  • Chick Embryo
  • Cilia (metabolism)
  • DNA, Complementary (metabolism)
  • Ear, Inner (embryology)
  • Gene Expression Regulation, Developmental
  • Hair Cells, Auditory (embryology)
  • HeLa Cells
  • Homozygote
  • Humans
  • Intracellular Membranes (metabolism)
  • Mice
  • Mice, Mutant Strains (metabolism)
  • Microscopy, Fluorescence
  • Models, Genetic
  • Mutation
  • Polymerase Chain Reaction
  • Protein Isoforms
  • Protein Structure, Tertiary
  • Time Factors
  • Transfection
  • Xenopus

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research network!

Choose Username:
Verify Password: