BACKGROUND: Gordon syndrome (GS) is a rare form of monogenic hypertension characterized by low renin hypertension, hyperkalemia, hyperchloremic metabolic acidosis, and normal glomerular filtration rate. To date, four genes causing GS have been identified as: WNK1, WNK4, CUL3, and KLHL3. CASE PRESENTATION: We report three cases of GS in two families. All patients presented with typical clinical features of GS and had a known dominant KLHL3 mutation. Oral thiazide treatment with low salt diet resulted in normalization of blood pressure and serum electrolytes in all three cases. CONCLUSIONS: GS should be considered in patients with low renin hypertension and hyperkalemia. Although it is a rare disease, the correct diagnosis of GS is clinically important, as it can easily be treated with a low sodium diet or thiazides. In addition, family studies can identify individuals with undiagnosed GS as all mutations causing this disease, except for some recessive KLHL3 mutations, are dominant mutations.
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