The function of Ensembl gene identifier ENSG00000171155 (C1GALT1C1, C1GALT1 specific chaperone 1) is as follows. Probable chaperone required for the generation of 1 O-glycan Gal-beta1-3GalNAc-alpha1-Ser/Thr (T antigen), which is a precursor for many extended O-glycans in glycoproteins. Probably acts as a specific molecular chaperone assisting the folding/stability of core 1 beta-3- galactosyltransferase (C1GALT1). {ECO:0000269|PubMed:12464682, ECO:0000269|PubMed:37216524}.