Component
Mouse tryptophan hydroxylase 2 / Tph2
Context-specific entity; species, compartment and exposure are stated on each claim.
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
Tph2 knockout markedly reduced mouse brain serotonin while peripheral serotonin was not substantially reduced.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- evidence_access
- Primary abstract
- experimental_model
- Mouse Tph2 knockout versus wild type.
- limitations
- Mouse developmental knockout is not a human dietary depletion experiment.
- nutrient_topic
- Tryptophan collection; molecular form, preparation, species, exposure and manipulation remain explicit. · L-Tryptophan
- plain_language
- The brain and peripheral serotonin factories are not interchangeable.
- primary_references
- Genetic disruption of both tryptophan hydroxylase genes dramatically reduces serotonin and affects behavior in models sensitive to antidepressants. · 2008 · https://pubmed.ncbi.nlm.nih.gov/18923670/ · DOI 10.1371/journal.pone.0003301
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Tryptophan: transport, protein synthesis, neuroactive metabolites, NAD and microbial pathways (2026-09-19) · lines 130–136
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Mouse Tph2 knockout versus wild type. · source_derived_draft · unverified_draft
## tryptophan-tph2-brain-loss The brain and peripheral serotonin factories are not interchangeable. Tph2 knockout markedly reduced mouse brain serotonin while peripheral serotonin was not substantially reduced. Model: Mouse Tph2 knockout versus wild type. Limitations: Mouse developmental knockout is not a human dietary depletion experiment. Evidence access: Primary abstract Genetic disruption of both tryptophan hydroxylase genes dramatically reduces serotonin and affects behavior in models sensitive to antidepressants. · 2008 · https://pubmed.ncbi.nlm.nih.gov/18923670/ · DOI 10.1371/journal.pone.0003301
Complete structured claim and evidence
Where it participates (unsigned role)
Combined Tph1/Tph2 knockout reduced peripheral as well as central serotonin in mice.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- evidence_access
- Primary abstract
- experimental_model
- Mouse double knockout.
- limitations
- Viability and subtle behavioral findings prevent equating any serotonin reduction with one inevitable psychiatric syndrome.
- nutrient_topic
- Tryptophan collection; molecular form, preparation, species, exposure and manipulation remain explicit. · L-Tryptophan
- plain_language
- Removing both enzyme systems affected both compartments.
- primary_references
- Genetic disruption of both tryptophan hydroxylase genes dramatically reduces serotonin and affects behavior in models sensitive to antidepressants. · 2008 · https://pubmed.ncbi.nlm.nih.gov/18923670/ · DOI 10.1371/journal.pone.0003301
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Tryptophan: transport, protein synthesis, neuroactive metabolites, NAD and microbial pathways (2026-09-19) · lines 138–144
AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Mouse double knockout. · source_derived_draft · unverified_draft
## tryptophan-tph-double-loss Removing both enzyme systems affected both compartments. Combined Tph1/Tph2 knockout reduced peripheral as well as central serotonin in mice. Model: Mouse double knockout. Limitations: Viability and subtle behavioral findings prevent equating any serotonin reduction with one inevitable psychiatric syndrome. Evidence access: Primary abstract Genetic disruption of both tryptophan hydroxylase genes dramatically reduces serotonin and affects behavior in models sensitive to antidepressants. · 2008 · https://pubmed.ncbi.nlm.nih.gov/18923670/ · DOI 10.1371/journal.pone.0003301
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.