Poly [ADP-ribose] polymerase 7 (PARP7), also known as TCDD-inducible poly-ADP-ribose polymerase (TIPARP), is an enzyme of the PARP family that catalyzes the transfer of ADP-ribose from NAD+ to specific amino acids of itself and other substrate proteins. It is encoded by the TIPARP gene on chromosome 3. The 17 members of the PARP family are divided into polyPARPs, monoPARPs, and PARPs without catalytic activity according to different catalytic functions. PARP7 is a monoPARP that catalyzes the transfer of single units of ADP-ribose onto substrates to change their function. PARP7 is involved in tumor generation and immune function recovery.