Potential transcription factor that may play a role in the regulation of genes involved in cell cycle G1/S transition (PubMed:1868030, PubMed:31141247). May bind to regulatory elements of genes, including the promoter of the transcription factor FOXO1 (PubMed:31141247). {ECO:0000269|PubMed:1868030, ECO:0000269|PubMed:31141247}. This is the function of ENSG00000137310 (TCF19, transcription factor 19).