LIMS1 (LIM zinc finger domain containing 1) is an evolutionarily conserved adaptor protein functioning within the IPP complex to promote F-actin bundling and dynamic cell adhesion events 1. The protein binds zinc ions and regulates actin filament network formation, supporting cell spreading and migration through focal adhesion reorganization. LIMS1 plays critical roles in diverse physiological processes. In bone marrow, PINCH1/2 (LIMS1 orthologs) are essential for mesenchymal stromal cell immunosuppressive function and hematopoietic regulation through CXCL12-MBL2 signaling 2. In kidney, LIMS1 is transcriptionally regulated by HIF-1α and promotes angiotensin II-induced tubulointerstitial fibrosis via vimentin interaction 3. In pancreatic cancer, LIMS1 elevation promotes cell survival under hypoxia-glucose deprivation through AKT/mTOR-dependent HIF1A translation and GLUT1 upregulation 4. Cardiac dysfunction occurs when LIMS1 is lost; zebrafish lims1 mutants develop severe chamber remodeling, systolic dysfunction, and heart failure via gp130/JAK1/STAT3 pathway hyperactivation 1. In transplantation, LIMS1 locus mismatches between donor-recipient pairs represent a minor histocompatibility antigen, associating with allograft rejection and anti-LIMS1 antibody responses 56. These findings establish LIMS1 as a multifunctional adaptor with implications for cardiac, renal, cancer, and transplant pathologies.