Transcriptional repressor that targets mainly transposable elements (PubMed:37973953). Primarily targets the long terminal repeat of endogenous retroviruses classified as MER11 elements which comprise subfamilies A, B and C (PubMed:37973953). May silence transposable elements through the establishment of heterochromatin-associated trimethylation of 'Lys-9' of histone H3 (H3K9me3) (PubMed:37973953). Can also bind to certain gene promoters and other genomic regions (PubMed:37973953). Represses transcription of specific MER11 elements during differentiation toward pancreatic lineages in early pancreas development (PubMed:37973953). By repressing transcription, prevents a liver gene expression program from being aberrantly activated during pancreas differentiation (PubMed:37973953). . This is the function of ZNF808 (zinc finger protein 808, Ensembl gene identifier ENSG00000198482).