Initial clinical assessments revealed biochemical and hormonal imbalances, characterized by hypophosphatemia, hyperparathyroidism, vitamin D deficiency, hyperalkaline phosphatasemia, and elevated levels of FGF23 and its co‐receptor α‐Klotho, while serum calcium levels remained within normal parameters (Table S1, Supporting Information). The gene discussed is FGF23; the disease is vitamin D deficiency.