fig2

Figure 2. MAF1 regulation of pol III may depend on subunit composition. POLR3GL (orange) is the ancestral paralogue and is expressed ubiquitously; it allows repression of pol III by MAF1. POLR3G (purple) is enriched in stem and cancer cells; its incorporation may make pol III more resistant to MAF1 and thereby contribute to unregulated transcription and selective induction of ncRNAs such as BC200 and snaR. ncRNAs: Noncoding RNAs.