Ribulose-5-phosphate-3-epimerase pseudogene 4 (RPEP4)

Ribulose-5-phosphate-3-epimerase pseudogene 4 (RPEP4) is a genomic region with sequence similarity to the ribulose-5-phosphate-3-epimerase (RPE) gene, which encodes an enzyme involved in the pentose phosphate pathway and the Calvin cycle[2][6][4][8]. RPEP4, however, is classified as a pseudogene, meaning it is not translated into a functional protein[7][5]. Pseudogenes were historically regarded as nonfunctional "junk" DNA, but some are known to possess regulatory roles such as competitive endogenous RNA in certain cellular contexts[5]. Currently, there is no scientific evidence supporting a functional role, disease association, or drug target status for RPEP4 specifically. It should not be mistaken for the functional enzyme RPE (ribulose-5-phosphate 3-epimerase), which participates in key cellular metabolic pathways[2][6][8][4]. If you require information on the functional enzyme or its gene, refer instead to "ribulose-5-phosphate 3-epimerase" (RPE), which is an enzyme with metabolic and potential disease relevance[2][6][8][4].