MATK (megakaryocyte-associated tyrosine kinase) is an intracellular tyrosine kinase that plays a critical regulatory role in hematopoietic cell signaling. The protein functions as a negative regulator of Src-family tyrosine kinases by specifically phosphorylating their C-terminal regulatory tyrosine residue 1. This regulatory mechanism is particularly important in megakaryocytic cells, where MATK participates in growth control pathways and megakaryocyte progenitor proliferation 1. The MATK gene is highly conserved between humans and mice (85% homology) and is located on chromosome 19 in humans 1. Structurally, the gene consists of 13 exons with separate genetic units encoding SH3 and SH2 domains, indicating sophisticated regulatory capabilities 1. Recent studies have identified MATK as a biomarker in various contexts, including stem cell proliferation where its expression in microvesicles correlates with enhanced cell growth 2. Additionally, MATK has emerged as a potential diagnostic marker in inflammatory diseases, with differential expression patterns observed between Behçet's disease and inflammatory bowel disease, suggesting distinct functional states in neutrophil-mediated immune responses 3. These findings highlight MATK's broader role beyond hematopoiesis in immune system regulation and inflammatory processes.