Vitamin A precursor pathway

The "Vitamin A precursor pathway" refers broadly to the series of biochemical reactions that convert dietary provitamin A carotenoids—primarily beta-carotene—into active forms of vitamin A such as retinal and retinoic acid. This process involves several key enzymes including β-carotene 15,15'-dioxygenase and various dehydrogenases. The resulting compounds play essential roles in vision (as 11-cis-retinal), regulation of gene transcription via nuclear receptors (retinoic acid acting on RARs/RXRs), immune system modulation, embryonic development, cell differentiation, skin integrity, reproduction, and maintenance of epithelial tissues. Disruption at any step can lead to clinical consequences ranging from visual impairment to increased infection risk or developmental defects. However, this is a **metabolic/biochemical pathway**, not a discrete molecular target such as an enzyme or receptor.[1][2][4][5][6] **Note:** The entry "Vitamin A precursor pathway" is **not** a canonical therapeutic target but describes an entire metabolic process involving multiple molecules and enzymes. It does not correspond to a single protein/receptor/enzyme that can be targeted by drugs in the conventional sense used for pharmacological targets. Therefore: *is_target*: false *is_incorrect*: true This entry should be replaced with specific enzymes within the vitamin A biosynthetic/metabolic cascade if structured information about druggable targets is required—for example: “β-Carotene 15,15'-monooxygenase” or “Retinol dehydrogenase.”

Other names

Vitamin A biosynthesis pathwayRetinoid metabolic pathwayProvitamin A conversion pathwayCarotenoid to retinol conversion