1 MCQs in Pediatrics for NEET PG
A 4-year-old boy presents with failure to thrive, coarse facial features, curly hair, and characteristic perioral papillomas. Genetic testing reveals an activating germline mutation in the HRAS proto-oncogene at the locus marked **A** (11p15.5). Which of the following best describes the pathogenic mechanism underlying Costello syndrome in this patient?
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