Component
A2PE-H2 bisretinoid precursor
Dihydro-bisretinoid phosphatidylethanolamine species; distinct from A2E.
1 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.
Where it participates (unsigned role)
Vitamin A-supplemented diets increased ocular A2E/bisretinoid accumulation in wild-type and Abca4-null mice relative to control diets.
Experimental context and source evidence
- experimental_model
- Dietary supplementation versus control; biochemical and morphologic endpoints
- exposure
- dietary vitamin A excess/supplementation
- genotype
- wild type and Abca4-null
- limitations
- Mouse exposure; no human dose or treatment recommendation follows. Degeneration depended on pigmentation and occurred on both diets.
- nutrient_topic
- Vitamin A research collection; topical membership is not evidence of a direct dietary effect. · Vitamin A
- organism
- Mus musculus
- plain_language
- Extra vitamin A increased visual-cycle by-products in these mice.
- primary_references
- [radu-2008] Accelerated accumulation of lipofuscin pigments in the RPE of a mouse model for ABCA4-mediated retinal dystrophies following Vitamin A supplementation (2008). https://pubmed.ncbi.nlm.nih.gov/18515570/ DOI: 10.1167/iovs.07-1470
- tissue_or_cell_type
- Eye/RPE
Vitamin A: forms, mechanisms, deficiency and excess (2026-09-17) · lines 847–858
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Dietary supplementation versus control; biochemical and morphologic endpoints · source_derived_draft · unverified_draft
### a-vision-excess-bisretinoids Vitamin A-supplemented diets increased ocular A2E/bisretinoid accumulation in wild-type and Abca4-null mice relative to control diets. Condition category: normal nutrient_topic: Vitamin A research collection; topical membership is not evidence of a direct dietary effect. plain_language: Extra vitamin A increased visual-cycle by-products in these mice. organism: Mus musculus tissue_or_cell_type: Eye/RPE experimental_model: Dietary supplementation versus control; biochemical and morphologic endpoints limitations: Mouse exposure; no human dose or treatment recommendation follows. Degeneration depended on pigmentation and occurred on both diets. exposure: dietary vitamin A excess/supplementation genotype: wild type and Abca4-null [radu-2008] Accelerated accumulation of lipofuscin pigments in the RPE of a mouse model for ABCA4-mediated retinal dystrophies following Vitamin A supplementation (2008). https://pubmed.ncbi.nlm.nih.gov/18515570/ DOI: 10.1167/iovs.07-1470
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.