Component
Vdr-null mouse genotype
Experimental mouse Vdr deletion eliminating functional vitamin D receptor signaling; distinct from dietary vitamin D deficiency.
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
A low-phosphate diet increased intestinal NaPi-IIb protein expression even in Vdr-null mice.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- cross_nutrient
- Vitamin D–calcium–phosphate regulation.
- evidence_locator
- Abstract: reported experimental results
- evidence_scope
- D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.
- experimental_model
- Vdr-null and wild-type mice; intestinal brush-border transporter immunodetection
- exposure
- Vdr deletion plus dietary phosphate restriction; exact dietary percentage and duration not given in the retrieved abstract.
- limitations
- Baseline NaPi-IIb protein and sodium-dependent phosphate transport were lower in knockout mice; preserved adaptation does not imply normal baseline transport.
- nutrient
- Vitamin D2 and D3 · Vitamin D2 and D3
- nutrient_topic
- Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
- organism
- Mus musculus
- plain_language
- The intestine retained a phosphate-conservation response despite loss of vitamin D receptor signaling.
- primary_references
- [vdm-segawa2004] Intestinal Na-P(i) cotransporter adaptation to dietary P(i) content in vitamin D receptor null mice. (2004). https://pubmed.ncbi.nlm.nih.gov/14996670/ DOI: 10.1152/ajprenal.00375.2003
- tissue_or_cell_type
- Intestinal brush-border membrane
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 713–727
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Vdr-null and wild-type mice; intestinal brush-border transporter immunodetection · source_derived_draft · unverified_draft
### vdm-low-phosphate-adaptation-persists-without-vdr A low-phosphate diet increased intestinal NaPi-IIb protein expression even in Vdr-null mice. Condition category: machinery_impairment nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: The intestine retained a phosphate-conservation response despite loss of vitamin D receptor signaling. organism: Mus musculus tissue_or_cell_type: Intestinal brush-border membrane experimental_model: Vdr-null and wild-type mice; intestinal brush-border transporter immunodetection limitations: Baseline NaPi-IIb protein and sodium-dependent phosphate transport were lower in knockout mice; preserved adaptation does not imply normal baseline transport. exposure: Vdr deletion plus dietary phosphate restriction; exact dietary percentage and duration not given in the retrieved abstract. cross_nutrient: Vitamin D–calcium–phosphate regulation. evidence_locator: Abstract: reported experimental results nutrient: Vitamin D2 and D3 evidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison. [vdm-segawa2004] Intestinal Na-P(i) cotransporter adaptation to dietary P(i) content in vitamin D receptor null mice. (2004). https://pubmed.ncbi.nlm.nih.gov/14996670/ DOI: 10.1152/ajprenal.00375.2003
Complete structured claim and evidence
Where it participates (unsigned role)
The combined mineral/lactose rescue diet prevented rickets and osteomalacia in VDR-ablated mice.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- cross_nutrient
- Vitamin D–calcium–phosphate regulation.
- evidence_locator
- Abstract: reported experimental results
- evidence_scope
- D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison.
- experimental_model
- VDR-ablated mice and control littermates receiving a mineral/lactose rescue diet
- exposure
- Combined mineral/lactose rescue diet; individual ingredient contributions and exact formulation are not resolved by the retrieved abstract.
- limitations
- This is a combined dietary rescue of receptor-deficient mice, not phosphate monotherapy, not a D2/D3 trial, and not evidence that VDR has no direct skeletal functions.
- nutrient
- Vitamin D2 and D3 · Vitamin D2 and D3
- nutrient_topic
- Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. · Vitamin D2 and D3
- organism
- Mus musculus
- plain_language
- Improving mineral delivery protected the skeleton even when the vitamin D receptor was missing.
- primary_references
- [vdm-li1998] Normalization of mineral ion homeostasis by dietary means prevents hyperparathyroidism, rickets, and osteomalacia, but not alopecia in vitamin D receptor-ablated mice. (1998). https://pubmed.ncbi.nlm.nih.gov/9751523/ DOI: 10.1210/endo.139.10.6262
- tissue_or_cell_type
- Skeleton
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Vitamin D2 and D3: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 761–775
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · VDR-ablated mice and control littermates receiving a mineral/lactose rescue diet · source_derived_draft · unverified_draft
### vdm-mineral-rescue-prevents-vdr-null-skeletal-defects The combined mineral/lactose rescue diet prevented rickets and osteomalacia in VDR-ablated mice. Condition category: machinery_impairment nutrient_topic: Vitamin D2 and D3 research collection; topical membership is not evidence of a direct dietary effect. plain_language: Improving mineral delivery protected the skeleton even when the vitamin D receptor was missing. organism: Mus musculus tissue_or_cell_type: Skeleton experimental_model: VDR-ablated mice and control littermates receiving a mineral/lactose rescue diet limitations: This is a combined dietary rescue of receptor-deficient mice, not phosphate monotherapy, not a D2/D3 trial, and not evidence that VDR has no direct skeletal functions. exposure: Combined mineral/lactose rescue diet; individual ingredient contributions and exact formulation are not resolved by the retrieved abstract. cross_nutrient: Vitamin D–calcium–phosphate regulation. evidence_locator: Abstract: reported experimental results nutrient: Vitamin D2 and D3 evidence_scope: D3 active metabolite or VDR machinery experiment; not a direct D2-versus-D3 comparison. [vdm-li1998] Normalization of mineral ion homeostasis by dietary means prevents hyperparathyroidism, rickets, and osteomalacia, but not alopecia in vitamin D receptor-ablated mice. (1998). https://pubmed.ncbi.nlm.nih.gov/9751523/ DOI: 10.1210/endo.139.10.6262
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.