The consequences of disrupting cardiac inwardly rectifying K(+) current (I(K1)) as revealed by the targeted deletion of the murine Kir2.1 and Kir2.2 genes.

Abstract excerpt

1. Ventricular myocytes demonstrate a steeply inwardly rectifying K(+) current termed I(K1). We investigated the molecular basis for murine I(K1) by removing the genes encoding Kir2.1 and Kir2.2. The physiological consequences of the loss of these genes were studied in newborn animals because mice lacking Kir2.1 have a cleft palate and die shortly after birth. 2. Kir2.1 (-/-) ventricular myocytes lack detectable...

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