Human neuronal acid-sensitive cationic channels, its cloning...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/12 (2006.01) C07K 14/705 (2006.01) G01N 33/68 (2006.01)

Patent

CA 2336221

Non-inactivating or slowly inactivating proton-gated cation channels are thought to play an important role in the perception of pain that accompanies tissue acidosis. We have identified a human proton-gated cation channel subunit that has biphasic desensitisationkinetics with both a rapidly inactivating Na+ -selective and a sustained component. The protein shares 84% sequence identity with the proton-gated cation channel rASIC3 (rDRASIC) from rat sensory neurones. The biphasic desnsitisation kinetics and the sequence homology suggest that this clone (hASIC3) is the human orthologue of rASIC3 (rDRASIC). While rASIC3 (rDRASIC) requires very acidic pH (< pH 4.5) for activation of the sustained current, the non-inactivating hASIC3 current starts to be activated when the pH decreases to below pH 6. hASIC3 is an acid sensor and might play an important role in the detection of lasting pH changes in human. We localized the hASIC3 gene to the human chromosome 7q35, 6.4 cRad telomeric from the microsatellite AFD4A082XC9.

On croit savoir que les canaux cationiques à porte protonique non inactivants ou lentement inactivants jouent un rôle important dans la perception de la douleur qui accompagne l'acidose tissulaire. Nous avons identifié une sous-unité de canal cationique à porte protonique caractérisée par une cinétique de désensibilisation biphasique avec à la fois une composante Na?+¿ sélective rapide et une composante persistante. La protéine est à 84 % identique à la séquence du canal cationique à porte protonique rASIC3 (rDRASIC) des neurones sensoriels du rat. La cinétique de désensibilisation biphasique et l'homologie de séquence suggèrent que ce clone (hASIC3) est l'orthologue humain de rASIC3 (rDRASIC). Alors que rASIC3 (rDRASIC) exige un pH très acide (?pH 4,5) pour la production d'un courant persistant, le courant hASIC3 non-inactivant commence à être activé lorsque le pH tombe au dessous de 6. Le gène hASIC3 est un capteur d'acidité qui pourrait jouer un rôle important dans la détection de modifications durables de pH chez l'homme. Nous avons localisé le gène hASIC3 dans le chromosome humain 7q35, à 6.4 cRad en direction du télomère à partir du microsatellite AFMA082XC9.

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