Dual-specificity kinase which possesses both serine/threonine and tyrosine kinase activities. Plays an essential role in ribosomal DNA (rDNA) double-strand break repair and rDNA copy number maintenance (PubMed:33469661). During DNA damage, mediates transcription silencing in part via phosphorylating and enforcing DSB accumulation of the histone methyltransferase EHMT2 (PubMed:32611815). Enhances the transcriptional activity of TCF1/HNF1A and FOXO1. Inhibits epithelial cell migration. Mediates colon carcinoma cell survival in mitogen-poor environments. Inhibits the SHH and WNT1 pathways, thereby enhancing adipogenesis. In addition, promotes expression of the gluconeogenic enzyme glucose-6-phosphatase catalytic subunit 1 (G6PC1). {ECO:0000269|PubMed:10910078, ECO:0000269|PubMed:11980910, ECO:0000269|PubMed:14500717, ECO:0000269|PubMed:24827035, ECO:0000269|PubMed:33469661}. This is the function of ENSG00000105204 (DYRK1B, dual specificity tyrosine phosphorylation regulated kinase 1B).