MYBPH (myosin binding protein H) is a sarcomeric protein that regulates muscle contraction through multiple mechanisms. In cardiac muscle, MYBPH functions cooperatively with cardiac myosin binding protein C (cMyBPC) to maintain normal contractility, as demonstrated by reduced cardiac contractility only when both proteins are simultaneously knocked down 1. The protein localizes to sarcomeric structures and contributes to sarcomere organization 1. Beyond its structural role, MYBPH acts as a negative regulator of cell motility by directly inhibiting both ROCK1 kinase and non-muscle myosin heavy chain IIA assembly, thereby reducing actomyosin organization and cell migration 23. In cardiac pathology, genetic variants in MYBPH serve as modifiers of hypertrophy severity in hypertrophic cardiomyopathy patients carrying specific mutations 4. The protein shows altered expression in response to therapeutic interventions, with mavacamten treatment upregulating MYBPH in patient-derived cardiac models 5. Interestingly, MYBPH expression varies significantly across different pathological contexts, being associated with poor prognosis in glioma patients 6 but serving as a potential biomarker for muscle function improvement in myotonic dystrophy 7. These findings establish MYBPH as a multifunctional protein with roles in both normal muscle physiology and disease pathogenesis.