MYO1H encodes unconventional myosin IH, a motor protein involved in intracellular transport and vesicle trafficking 1. The protein functions in actin cytoskeleton organization, actin filament-based movement, and endocytosis, with expression in microvilli and the plasma membrane [GO annotations]. MYO1H plays a vital role in chondrocyte morphology and intracellular movement, directly influencing mandibular skeletal development 2. Genetically, MYO1H variants are associated with craniofacial skeletal patterns: the rs10850110 polymorphism shows strong association with mandibular prognathism risk (odds ratio 7.44) 3, while rs3825393 associates with mandibular retrognathism 4. The rs3825393 C>T variant (p.Pro1001Leu) is significantly associated with mandibular prognathism, with zebrafish knockdown models demonstrating jaw cartilage defects 5. MYO1H variants associate with both sagittal and vertical craniofacial patterns in Brazilian populations 6. Beyond craniofacial development, MYO1H mutations cause rare recessive congenital central hypoventilation syndrome; a homozygous frameshift mutation impairs CO2 sensitivity in retrotrapezoid neurons controlling respiration 1, and a heterozygous deletion variant may contribute to hereditary spastic paraplegia 7. These findings establish MYO1H as a multifunctional gene critical for skeletal morphogenesis and neurological control.