ABC transporters have also been implicated in epigenetic and transcriptional regulation; ABCC7 modulates miR-193b and tumour suppressor expression in prostate cancer, while ABCG2 transports micronutrients like folate that serve as cofactors for methylation reactions affecting chromatin structure and gene expression [65,66,67]. The gene discussed is ABCG2; the disease is prostate carcinoma.