Poly(A)-specific ribonuclease PNLDC1 (PNLDC1)

Poly(A)-specific ribonuclease PNLDC1 is a deadenylase enzyme that specifically trims 3′ poly(A) tails from RNA and is structurally related to poly(A)-specific ribonuclease (PARN), but forms a distinct evolutionary group[1]. It is selectively expressed in mammalian embryonic stem cells, testes, and germline cells, where it plays a crucial role in the maturation of piwi-interacting RNAs (piRNAs) by trimming precursor piRNA 3′ ends, thereby enabling transposon silencing and maintaining genome integrity in the germline[1][2][3][4]. PNLDC1 is essential for spermatogenesis, with its loss causing defective piRNA processing and spermatogenic failure leading to male infertility (SPGF57)[2][3][4][5]. The enzyme's activity is tightly regulated via epigenetic mechanisms, is predominantly cytoplasmic (localized to ER), and is involved in pathways controlling cell cycle, chromatin assembly, and reprogramming during early development[1]. Currently, there are no known direct drugs or small molecules that target PNLDC1, nor is it described as a clinically actionable biomarker, but its disruption is a notable cause of genetic azoospermia[5].

Other names

PARN like ribonuclease domain containing exonuclease 1HsPNLDC1FLJ40240dJ195P10.2TrimmerPARN-like domain-containing protein 1Poly(A)-specific ribonuclease domain-containing protein 1SPGF57poly(A)-specific ribonuclease PARN-like domain-containing protein 1