AICDA and breast carcinoma: In the present study, two human microRNAs, miR-155 and miR-93, were each shown to repress the translation of human AID through interactions with the AID 3'UTR in the MCF-7 breast carcinoma cell line which aberrantly expresses AID. Together, our data suggest that low-level errant AID expression and subsequent genome damage may be prevented through protective miR-93 and/or miR-155 regulation.