The function of Ensembl gene identifier ENSG00000149308 (NPAT, nuclear protein, coactivator of histone transcription) is as follows. Transcription regulator required for progression through the G1 and S phases of the cell cycle and for S phase entry (PubMed:12665581, PubMed:15555599, PubMed:9472014). Acts as a key transcription regulator of histones (PubMed:10995386, PubMed:10995387, PubMed:12724424, PubMed:14585971, PubMed:14612403, PubMed:15988025, PubMed:16131487, PubMed:17163457, PubMed:25339177, PubMed:40516528, PubMed:40516529). Activates transcription of the histone H2A, histone H2B, histone H3 and histone H4 genes in conjunction with GON4L and MIZF (PubMed:10995386, PubMed:10995387, PubMed:12724424, PubMed:14585971, PubMed:14612403, PubMed:15988025, PubMed:16131487, PubMed:17163457, PubMed:25339177). Together with CRAMP1, binds to the promoters of H1 genes (H1-2, H1-3, H1-4, H1-5 and H1-10/H1x), driving their transcription (PubMed:40516528, PubMed:40516529). Also positively regulates the ATM, MIZF and PRKDC promoters (PubMed:17826007, PubMed:17974976, PubMed:8743993, PubMed:8923007). Transcriptional activation may be accomplished at least in part by the recruitment of the NuA4 histone acetyltransferase (HAT) complex to target gene promoters (PubMed:17967892). {ECO:0000269|PubMed:10995386, ECO:0000269|PubMed:10995387, ECO:0000269|PubMed:12665581, ECO:0000269|PubMed:12724424, ECO:0000269|PubMed:14585971, ECO:0000269|PubMed:14612403, ECO:0000269|PubMed:15555599, ECO:0000269|PubMed:15988025, ECO:0000269|PubMed:16131487, ECO:0000269|PubMed:17163457, ECO:0000269|PubMed:17826007, ECO:0000269|PubMed:17967892, ECO:0000269|PubMed:17974976, ECO:0000269|PubMed:25339177, ECO:0000269|PubMed:40516528, ECO:0000269|PubMed:40516529, ECO:0000269|PubMed:8743993, ECO:0000269|PubMed:8923007, ECO:0000269|PubMed:9472014}.