Additional abnormalities included hypomagnesemia in three patients (mean serum magnesium: 0.74 mmol/L), vitamin D deficiency in two (mean 25OHD: 27.6 ng/mL), hyperphosphatemia in two (mean phosphorus 1.41 mmol/L), and universal elevated plasma renin activity. The gene discussed is REN; the disease is vitamin D deficiency.