Nuclear GTPase found in germinal center B-cells, where it may inhibit function of the activation-induced cytidine deaminase AICDA (PubMed:19734146). Reduces somatic hypermutation in B-cells which may enhance genome stability (By similarity). . This is the function of Ensembl gene identifier ENSG00000189233 (NUGGC, nuclear GTPase, germinal center associated).