Enables several functions, including ATP binding activity; ATP-activated inward rectifier potassium channel activity; and potassium ion binding activity. Involved in several processes, including cellular response to magnesium ion; potassium ion transport; and response to potassium ion. Located in plasma membrane. Biomarker of nephrotic syndrome. Human ortholog(s) of this gene implicated in Bartter disease type 2. Orthologous to human KCNJ1 (potassium inwardly rectifying channel subfamily J member 1). [provided by Alliance of Genome Resources, Apr 2022]