- The human gene for the poly(A)-specific ribonuclease (PARN) maps to 16p13 and has a truncated copy in the Prader-Willi/Angelman syndrome region on 15q11-->q13. Buiting, K., Körner, C., Ulrich, B., Wahle, E., Horsthemke, B. Cytogenet. Cell Genet. (1999)