Component
Retinol dehydrogenase 8 / RDH8
Photoreceptor outer-segment retinal reductase.
2 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What it acts on
Single-cell knockout comparisons showed RDH8 supplies most reduction of bleach-generated all-trans-retinal in mouse rod outer segments.
Experimental context and source evidence
- experimental_model
- Wild-type/Rdh8-null/Rdh12-null rod fluorescence
- limitations
- Residual reductases exist; this does not establish an exclusive enzyme.
- nutrient_topic
- Vitamin A research collection; topical membership is not evidence of a direct dietary effect. · Vitamin A
- organism
- Mus musculus
- plain_language
- RDH8 converts the aldehyde photoproduct back to retinol in the outer segment.
- primary_references
- [chen-2012] Reduction of all-trans-retinal in vertebrate rod photoreceptors requires the combined action of RDH8 and RDH12 (2012). https://pubmed.ncbi.nlm.nih.gov/22621924/ DOI: 10.1074/jbc.M112.354514
- tissue_or_cell_type
- Rod outer segment
Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17) · lines 756–765
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Wild-type/Rdh8-null/Rdh12-null rod fluorescence · source_derived_draft · unverified_draft
### a-vision-rdh8-reduction Single-cell knockout comparisons showed RDH8 supplies most reduction of bleach-generated all-trans-retinal in mouse rod outer segments. Condition category: normal nutrient_topic: Vitamin A research collection; topical membership is not evidence of a direct dietary effect. plain_language: RDH8 converts the aldehyde photoproduct back to retinol in the outer segment. organism: Mus musculus tissue_or_cell_type: Rod outer segment experimental_model: Wild-type/Rdh8-null/Rdh12-null rod fluorescence limitations: Residual reductases exist; this does not establish an exclusive enzyme. [chen-2012] Reduction of all-trans-retinal in vertebrate rod photoreceptors requires the combined action of RDH8 and RDH12 (2012). https://pubmed.ncbi.nlm.nih.gov/22621924/ DOI: 10.1074/jbc.M112.354514
Complete structured claim and evidence
Where it participates (unsigned role)
Abca4/Rdh8 double-knockout mice developed early RPE/photoreceptor dystrophy in the retinal-clearance study.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- experimental_model
- Double-knockout retinoid and retinal phenotype
- limitations
- Light and genetic background influence phenotype; the experiment does not isolate A2E as sole cause.
- nutrient_topic
- Vitamin A research collection; topical membership is not evidence of a direct dietary effect. · Vitamin A
- organism
- Mus musculus
- plain_language
- Removing both disposal routes made the retina vulnerable.
- primary_references
- [maeda-2008] Retinopathy in mice induced by disrupted all-trans-retinal clearance (2008). https://pubmed.ncbi.nlm.nih.gov/18658157/ DOI: 10.1074/jbc.M804505200
- tissue_or_cell_type
- RPE and photoreceptors
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17) · lines 825–834
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Double-knockout retinoid and retinal phenotype · source_derived_draft · unverified_draft
### a-vision-clearance-retinopathy Abca4/Rdh8 double-knockout mice developed early RPE/photoreceptor dystrophy in the retinal-clearance study. Condition category: machinery_impairment nutrient_topic: Vitamin A research collection; topical membership is not evidence of a direct dietary effect. plain_language: Removing both disposal routes made the retina vulnerable. organism: Mus musculus tissue_or_cell_type: RPE and photoreceptors experimental_model: Double-knockout retinoid and retinal phenotype limitations: Light and genetic background influence phenotype; the experiment does not isolate A2E as sole cause. [maeda-2008] Retinopathy in mice induced by disrupted all-trans-retinal clearance (2008). https://pubmed.ncbi.nlm.nih.gov/18658157/ DOI: 10.1074/jbc.M804505200
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.