Peptidylprolyl isomerase A pseudogene 89 (PPIAP89)

Peptidylprolyl isomerase A pseudogene 89 (PPIAP89) is a member of the PPIA pseudogene family found in the human genome. Pseudogenes are DNA sequences similar to known genes but are nonfunctional due to disabling mutations such as frameshifts or premature stop codons. PPIAP89 shares sequence similarity with the functional peptidylprolyl isomerase A gene (PPIA), which encodes cyclophilin A, an enzyme involved in protein folding and various cellular regulatory processes. Unlike its parent gene, PPIAP89 does not encode a functional protein and does not have a verified physiological or pathological protein function. Some pseudogenes, in certain contexts, can exert regulatory effects at the transcriptional or post-transcriptional levels, such as by acting as decoys for microRNAs or generating regulatory RNAs, but these roles have not been specifically documented for PPIAP89. PPIAP89 appears in genome databases (HGNC: 53713; NCBI Gene: 442460; Ensembl: ENSG00000223819) and is annotated as a pseudogene, which is generally not a classical receptor, enzyme, or drug target. There is no evidence implicating PPIAP89 as a biomarker, direct disease gene, or target of any approved or investigational drugs.