Plays a role as a mediator of E2F1-induced apoptosis in the absence of p53/TP53 (PubMed:15565177). Plays a role as a mediator of E2F1-induced apoptosis in the absence of p53/TP53. Inhibits TLR9 response to nucelic acids and regulates TLR9-mediated innate immune response (By similarity). {ECO:0000250|UniProtKB:Q8CB44, ECO:0000269|PubMed:15565177}. This is the function of Ensembl gene identifier ENSG00000075240 (GRAMD4, GRAM domain containing 4).