Cytochrome b5 type A pseudogene 4 (CYB5AP4)

Cytochrome b5 type A pseudogene 4 (CYB5AP4) is a processed pseudogene related to the functional CYB5A gene, which encodes the cytochrome b5 type A protein, a membrane-bound hemoprotein functioning as an electron carrier for multiple oxygenases[2][3]. However, as a processed pseudogene, CYB5AP4 itself does not code for a functional protein due to mutations that inactivate its sequence or disrupt regulatory elements required for expression[2]. There is no evidence supporting a direct biological function, disease association, or therapeutic value for this pseudogene in humans. Occasionally, pseudogenes may regulate gene networks at the RNA level (e.g., via miRNA sponging), but there is no published information supporting such a role for CYB5AP4 specifically[2][4].\n\nKey clarifying point: \n- CYB5AP4 is a **pseudogene**—not an enzyme, receptor, transporter, or typical therapeutic target[2]. \n- The functional protein and official therapeutic target is **cytochrome b5 type A** (gene: CYB5A, protein: cytochrome b5 type A), not this pseudogene[3][5]. \n- There is nothing misspelled or factually wrong regarding the existence of CYB5AP4, but using it as a molecular drug target or receptor is incorrect. The correct target would be its parental gene/protein, **CYB5A**.

Other names

bA189G24.1Psgb-5-2