Kcnj10 Conditional Knockout mouse models

Kcnj10, the mouse ortholog of human KCNJ10, encodes Kir4.1, the principal inwardly rectifying potassium channel of astrocytes, Bergmann glia, oligodendrocytes, and retinal Muller cells, where it clamps the glial membrane near the potassium equilibrium potential and performs spatial buffering of extracellular potassium released during neuronal firing. Kir4.1 functions as a homotetramer or as an obligate partner in Kir4.1/Kir5.1 heteromers with the Kcnj16 product, which confers steep intracellular pH sensitivity, and it also operates in the distal convoluted tubule and stria vascularis, coupling to the sodium pump and to chloride handling. Biallelic human mutations cause SeSAME/EAST syndrome with seizures, ataxia, sensorineural deafness, and renal salt wasting, and constitutive nulls die in the early postnatal period with hypomyelination and severe motor impairment, so glia-restricted conditional deletion using Gfap-Cre or Aldh1l1-CreER is required for adult work. No other glial Kir substitutes effectively, so match allele to whether the endpoint is potassium clearance, seizure threshold, or renal electrolyte handling.

Tissue restricted knockout of Kcnj10 keeps wild type function everywhere else. Breeding is often more robust, and the setup mirrors patient biology where mutations arise in a subset of cells.