Advances in molecular genetics have expanded the IPFDs landscape to include defects in other platelet receptors (Glycoprotein (GP)-VI, P2Y12, and thromboxane A2[TxA2]-R), signaling mediators (RASGRP2, FERMT3, G-protein regulators, PLC, and TxA2 pathway enzymes), and granule biogenesis disorders such as Hermansky–Pudlak and Chediak–Higashi syndromes. The gene discussed is P2RY12; the disease is Chediak-Higashi syndrome.