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WNK lysine deficient protein kinase 1 (WNK1) is a cytoplasmic serine-threonine kinase expressed in the distal nephron which likely plays an important role in hypertension. WNK1 is responsible for controling Na+ and Cl- ion transport by inhibiting the activity of other related protein kinases, such as WNK4.
WNK1 mutations have been associated with Gordon hyperkalemia-hypertension syndrome (pseudohypoaldosteronism type II) and congenital sensory neuropathy.
WNK1 is also known as Human Accelerated Region 5, and is thought to have played a key role in differentiating humans from apes.