Phenotypic overlap with Noonan syndrome 3 (609942) or cardiofaciocutaneous syndrome (115150) [MISCELLANEOUS] Associated with advanced paternal age [MISCELLANEOUS] Characteristic facial features become more apparent with age [MISCELLANEOUS] Sudden death [MISCELLANEOUS] Caused by mutation in the V-Ha-RAS Harvey rat sarcoma viral oncogene homolog gene (HRAS, 190020.0001) [MOLECULAR BASIS] De novo mutation in most cases [MISCELLANEOUS]
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