Vitamin D resistant rickets occurs due to all Except
Correct Answer: alpha 1 hydroxylase deficiency
Description: The disorder is due to missing or inactive PHEX gene. PHEX inactivates phosphatonins that mediate phosphate wasting. Thus, patients with Vitamin D resistant rickets cannot retain phosphate, leading to renal phosphate wasting. ref - Harrisons internal medicine 20e p2920
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