Pseudohypoaldosteronism type 2
Pseudohypoaldosteronism type 2 is characterized by metabolic acidosis and hyperkalemia as usual. It differs in low renin and usually normal aldosteron levels and hypertension. The mode of inheritance is autosomal dominant.
Inheritance of Pseudohypoaldosteronism type 2 is autsomal dominant. As in all kinds of hypoaldosteronism metabolic acidosis and hyperkalemia are present. In contrast to othe other forms renin is suppressed but aldosteron is usually normal. Hight blood pressure is typical. Pathognomonic and of therapeutic relevance is prompt responsiveness to thiazide.
In pseudohypoaldosteronism measurements of blood gases, serum electrolytes (Na, K, Cl), renin, and aldosterone are required. The diagnosis is made based on low renin and normal aldosterone levels. Blood pressure is elevated. Furthermore, the adequate respons to aldosterone may be tested. The correction of all abnormalities by low dose thiazide can is pathonomonic.
Mutations in two members of the WNK serine-threonine kinase family (WNK1 and WNK4) are known to cause the disease though still not understood is the precise pathogenic mechanisms. The protein product of these two genes is dentified in the distal convoluted tubule (DCT) and cortical collecting duct (CCD). The extracellular portion is found close to the tight junctions. There is an other locus on chromosome 1 (1q31-q42) associated with this disease. The gene still waits to become identified.
|Pseudohypoaldosteronism type 2|
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