Workup for hypercalcemia revealed a serum PTH level of 15.8 (normal 10–65 and SI unit: 15.8 ng/L (10–650), total vitamin D 25-OH which was 30.2 ng/mL (normal 14–60 and SI unit 75.38 nmol/L (35–150)), and vitamin D 1,25 dihydroxy level which was elevated at 128 pg/mL (normal 25–45 and SI units 78.5 pmol/L (60–108)). The gene discussed is PTH; the disease is Hypercalcemia.