MRTFA (myocardin-related transcription factor A) is a transcriptional coactivator that forms complexes with serum response factor (SRF) to regulate cytoskeletal gene expression and cellular responses to mechanical stimuli 1. The protein functions as a mechanotransduction sensor through its RPEL repeats, which bind globular actin (G-actin), allowing MRTFA to respond to changes in actin dynamics and translocate to the nucleus where it activates SRF-dependent transcription 2. MRTFA plays critical roles in cellular differentiation, including cardiomyocyte maturation, where it regulates sarcomere assembly and mitochondrial metabolism 2, and vascular smooth muscle cell phenotype switching in atherosclerosis 3. Disease relevance includes immunodeficiency, with compound heterozygous mutations causing neutrophil dysfunction, impaired neutrophil migration, and autoinflammatory manifestations 4. MRTFA also contributes to cancer progression, promoting pancreatic cancer growth and metastasis through KRAS and epithelial-mesenchymal transition signaling pathways 5. Additionally, MRTFA responds to matrix stiffness in intervertebral disc degeneration, regulating nucleus pulposus cell glycolysis through AMPK pathway modulation 6. The protein's ability to couple mechanical forces to transcriptional responses makes it a key regulator in tissue homeostasis and disease progression.