The function of CRAMP1 (cramped chromatin regulator 1, ENSG00000007545) is as follows. Transcription factor, which specifically drives expression of histone H1 genes (PubMed:40516528, PubMed:40516529). Binds to the promoters of H1 genes (H1-2, H1-3, H1-4, H1-5 and H1-10/H1x) together with NPAT and GON4L, positively regulating their transcription (PubMed:40516528, PubMed:40516529). {ECO:0000269|PubMed:40516528, ECO:0000269|PubMed:40516529}.