Keratitis-ichthyosis-deafness syndrome-associated Cx26 mutants produce nonfunctional gap junctions but hyperactive hemichannels when co-expressed with wild type Cx43

Isaac E. García, Jaime Maripillán, Oscar Jara, Ricardo Ceriani, Angelina Palacios-Muñoz, Jayalakshmi Ramachandran, Pablo Olivero, Tomas Perez-Acle, Carlos González, Juan C. Sáez, Jorge E. Contreras, Agustín D. Martínez

Resultado de la investigación: Contribución a una revistaArtículo

44 Citas (Scopus)

Resumen

Mutations in Cx26 gene are found in most cases of human genetic deafness. Some mutations produce syndromic deafness associated with skin disorders, like the Keratitis-Ichthyosis-Deafness syndrome (KID). Because in the human skin connexin 26 (Cx26) is co-expressed with other connexins, like Cx43 and Cx30, and as the KID syndrome is inherited as autosomal dominant condition, it is possible that KID mutations change the way Cx26 interacts with other co-expressed connexins. Indeed, some Cx26 syndromic mutations showed gap junction dominant negative effect when co-expressed with wild-type connexins, including Cx26 and Cx43. The nature of these interactions and the consequences on hemichannels and gap junction channel (GJC) functions remain unknown. In this study, we demonstrate that syndromic mutations, at the N terminus segment of Cx26, change connexin oligomerization compatibility, allowing aberrant interactions with Cx43. Strikingly, heteromeric oligomer formed by Cx43/Cx26 (syndromic mutants) shows exacerbated hemichannel activity but nonfunctional GJCs; this also occurs for those Cx26 KID mutants that do not show functional homomeric hemichannels. Heterologous expression of these hyperactive heteromeric hemichannels increases cell membrane permeability, favoring ATP release and Ca 2+ overload. The functional paradox produced by oligomerization of Cx43 and Cx26 KID mutants could underlie the severe syndromic phenotype in human skin.

Idioma originalInglés
Páginas (desde-hasta)1338-1347
Número de páginas10
PublicaciónJournal of Investigative Dermatology
Volumen135
N.º5
DOI
EstadoPublicada - 22 may 2015

Áreas temáticas de ASJC Scopus

  • Bioquímica
  • Biología molecular
  • Dermatología
  • Biología celular

Huella Profundice en los temas de investigación de 'Keratitis-ichthyosis-deafness syndrome-associated Cx26 mutants produce nonfunctional gap junctions but hyperactive hemichannels when co-expressed with wild type Cx43'. En conjunto forman una huella única.

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    García, I. E., Maripillán, J., Jara, O., Ceriani, R., Palacios-Muñoz, A., Ramachandran, J., Olivero, P., Perez-Acle, T., González, C., Sáez, J. C., Contreras, J. E., & Martínez, A. D. (2015). Keratitis-ichthyosis-deafness syndrome-associated Cx26 mutants produce nonfunctional gap junctions but hyperactive hemichannels when co-expressed with wild type Cx43. Journal of Investigative Dermatology, 135(5), 1338-1347. https://doi.org/10.1038/jid.2015.20