The function of QSER1 (glutamine and serine rich 1, ENSG00000060749) is as follows. Plays an essential role in the protection and maintenance of transcriptional and developmental programs. Protects many bivalent promoters and poised enhancers from hypermethylation, showing a marked preference for these regulatory elements over other types of promoters or enhancers. Mechanistically, cooperates with TET1 and binds to DNA in a common complex to inhibit the binding of DNMT3A/3B and therefore de novo methylation. .