CRB1 antibodies are immunochemical tools targeting the Crumbs homolog 1 (CRB1) protein, a transmembrane glycoprotein critical for retinal photoreceptor integrity and cell polarity. These antibodies enable researchers to study CRB1’s roles in retinal diseases such as retinitis pigmentosa (RP) and Leber congenital amaurosis (LCA) . CRB1 antibodies are used to visualize protein localization, quantify expression levels, and investigate molecular interactions in retinal tissues and disease models .
CRB1 antibodies have been used to map protein expression in human retinal organoids. Studies show CRB1 localizes to the outer limiting membrane (OLM) of photoreceptors and Müller glial cells, with reduced expression observed in CRB1-mutant organoids . Antibodies against the extracellular domain (ECD) and intracellular domain (ICD) reveal distinct staining patterns, suggesting isoform-specific roles .
Proximity ligation assays using CRB1 antibodies demonstrated interactions between CRB1 and NOTCH1 extracellular domains, implicating CRB1 in Notch signaling pathways . Co-immunoprecipitation studies further confirmed CRB1 forms homo- and heteromeric complexes with CRB2 .
CRB1 antibodies identified dysregulated endosomal trafficking in CRB1-mutant retinal organoids, including reduced RAB11A+ recycling endosomes and increased WDFY1+ vesicles . These findings link CRB1 loss to defective receptor recycling and autophagy .
Human retina: Cytoplasmic staining in all retinal layers (Novus NBP2-56113) .
Mouse eye: Strong signal at the OLM (Proteintech 26598-1-AP) .