"In genetics, a silencer is a DNA sequence capable of binding transcription regulation factors, called repressors. DNA contains genes and provides the template to produce messenger RNA (mRNA). That mRNA is then translated into proteins that activate or inactivate gene expression in cells. When a repressor protein binds to the silencer region of DNA, RNA polymerase\u2014the enzyme that transcribes DNA into RNA\u2014is prevented from binding to the promoter region."@en . . . . . . . . . .