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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Deafness associated changes in expression of two-pore domain potassium channels in the rat cochlear nucleus.

Two-pore domain potassium channels (K(2PD)(+)) play an important role in setting resting membrane potential by regulating background leakage of potassium ions, which in turn controls neuronal excitability. To determine whether these channels contribute to activity-dependent plasticity following deafness, we used quantitative real-time PCR to examine the expression of 10 K(2PD)(+) subunits in the rat cochlear nucleus at 3 days, 3 weeks and 3 months after bilateral cochlear ablation. There was a large sustained decrease in the expression of TASK-5, a subunit that is predominantly expressed in auditory brain stem neurons, and in the TASK-1 subunit which is highly expressed in several types of cochlear nucleus neurons. TWIK-1 and THIK-2 also showed significant decreases in expression that were maintained across all time points. TWIK-2, TREK-1 and TREK-2 showed no significant change in expression at 3 days but showed large decreases at 3 weeks and 3 months following deafness. TRAAK and TASK-3 subunits showed significant decreases at 3 days and 3 weeks following deafness, but these differences were no longer significant at 3 months. Dramatic changes in expression of K(2PD)(+) subunits suggest these channels may play a role in deafness-associated changes in the excitability of cochlear nucleus neurons.[1]


  1. Deafness associated changes in expression of two-pore domain potassium channels in the rat cochlear nucleus. Holt, A.G., Asako, M., Keith Duncan, R., Lomax, C.A., Juiz, J.M., Altschuler, R.A. Hear. Res. (2006) [Pubmed]
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