1 MCQs in Pediatrics for NEET PG
A 4-year-old girl presents with vaginal bleeding, breast development, and multiple bone lesions with a characteristic ground-glass appearance on X-ray. Physical examination reveals irregular, jagged brown macules on her trunk that respect the midline. Genetic testing of affected bone tissue reveals a post-zygotic somatic activating mutation in the gene marked **A** in the diagram. Which of the following best explains why this mutation causes autonomous hormone secretion in affected tissues?
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