Transcriptional activator. Activates the gene for selenocysteine tRNA (tRNAsec). Binds to the SPH motif of small nuclear RNA (snRNA) gene promoters. Participates in efficient U6 RNA polymerase III transcription via its interaction with CHD8.
The transcription from the minimalCcta promoter was up-regulated 3-fold by ZNF143 and 6-fold by ZNF76 when full-length proteins were co-expressed, indicating that both ZNF143 and ZNF76 can enhance Ccta transcription.