PPP4R3C (protein phosphatase 4 regulatory subunit 3C) is a regulatory subunit of the protein phosphatase 4 complex involved in DNA damage response and double-strand break repair. Based on limited published evidence, PPP4R3C localizes to the nucleoplasm and exhibits protein phosphatase activator activity. A single transcriptomic study 1 identified PPP4R3C as differentially expressed in fetal testicular tissue under nutrient restriction conditions, though functional characterization in this context remains unexplored. Direct molecular mechanisms and physiological roles require further investigation.