DBNL (drebrin like) encodes a multifunctional adapter protein that serves as a critical regulator of actin cytoskeleton dynamics and cellular architecture. The protein exists as a physiological dimer under normal conditions and binds F-actin filaments to control cytoskeletal organization 1. DBNL plays essential roles in multiple cellular processes, including endocytosis, cell polarity maintenance, and immunological function. In epithelial cells, DBNL collaborates with β-catenin to promote N-cadherin maturation and adherens junction formation, which is crucial for maintaining apico-basal polarity 2. In immune cells, particularly CD4+ T lymphocytes, DBNL localizes to immunological synapses where it regulates T cell activation through interactions with the actin cytoskeleton and CXCR4 chemokine receptor, and notably provides resistance against HIV-1 infection 3. The protein has emerged as a potential biomarker in various pathological conditions, with autoantibodies against DBNL identified in idiopathic small fiber neuropathy patients 4 and altered expression observed in rosacea lesions where it correlates with disease severity 5. DBNL's diverse functions underscore its importance as a key cytoskeletal adapter protein linking membrane dynamics, cell signaling, and structural organization across multiple cell types.