May be involved in transcriptional regulation. Has in vitro transcription inhibition activity. Acts as a tumor suppressor in hepatocellular carcinoma (HCC) cells. {ECO:0000269|PubMed:14586771, ECO:0000269|PubMed:24565846}. This is the function of Ensembl gene identifier ENSG00000242220 (TCP10L, t-complex 10 like).