Retinal (RAL) (RAL)

Retinal is the polyene aldehyde form of Vitamin A and serves as the essential light-sensitive chromophore in all visual pigments (Source: PubChem CID 638015). In the vertebrate eye, 11-cis-retinal is covalently bound to opsin proteins via a Schiff base linkage; upon photon absorption, it isomerizes to all-trans-retinal, initiating the phototransduction cascade (Source: Kiser et al., 2014, Chem Rev). This process is vital for vision, and the regeneration of 11-cis-retinal occurs through the enzymatic visual cycle (Source: NIH, StatPearls). Dysregulation of this cycle leads to the accumulation of toxic byproducts like A2E, which are implicated in Stargardt disease and age-related macular degeneration (Source: Sparrow et al., 2010, J Lipid Res). Therapeutic strategies include visual cycle modulators like Emixustat to reduce metabolic stress or synthetic retinoids like QLT091001 to replace deficient chromophores (Source: ClinicalTrials.gov). Monitoring efficacy often involves fundus autofluorescence to track lipofuscin levels and electroretinography to assess retinal sensitivity (Source: NIH).

Other names

RetinaldehydeVitamin A aldehyde11-cis-retinalAll-trans-retinalRetinene

Visual cycle modulation to reduce toxic byproduct accumulation or chromophore replacement therapy (Source: Kubota et al., 2014; Koenekoop et al., 2014)