Component
Local thyroid-hormone metabolism
Tissue-dependent activation and inactivation of thyroid hormones.
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 acts on it
Human SECISBP2 deficiency is associated with an abnormal thyroid-hormone profile.
Experimental context and source evidence
- availability_state
- Rare genetic SECISBP2 deficiency, distinct from inadequate dietary selenium.
- experimental_scope
- Rare human genetic disorder and biochemical role of SECIS-dependent recoding.
- limitations
- Growth, muscle, and reproductive findings in genetic disease are not direct phenocopies of ordinary dietary deficiency. Adequate intake does not define machinery function.
- trigger_kind
- machinery_impairment
Selenium deficiency: a mechanism-first reference · lines 505–509
Supplied selenium deficiency reference · supports · Supplied reference; verify the primary study and experimental context. · source_derived_draft · unverified_draft
SECISBP2 (SBP2) SECISBP2 deficiency Abnormal thyroid-hormone profile, growth and muscle phenotypes, male infertility and other multisystem effects
Complete structured claim and evidenceRestriction-related changes in deiodinase activity can change local thyroid-hormone metabolism.
Experimental context and source evidence
- availability_state
- Selenium restriction affects deiodinase expression or activity in a particular tissue.
- experimental_scope
- Mechanistic synthesis; deiodinase responses and clinical consequences are tissue- and context-dependent.
- limitations
- Normal serum TSH neither directly measures local T3 generation nor establishes hidden clinical tissue hypothyroidism. Combined iodine deficiency is a distinct context.
- trigger_kind
- nutrient_deficiency
Selenium deficiency: a mechanism-first reference · lines 319–327
Supplied selenium deficiency reference · supports · Supplied reference; verify the primary study and experimental context. · source_derived_draft · unverified_draft
DIO1, DIO2, and DIO3 are selenoproteins. Selenium restriction can therefore affect deiodinase biology and local thyroid-hormone metabolism. selenium restriction ↓ changes in deiodinase expression/activity ↓ changes in local T4 ↔ T3 / rT3 metabolism Serum TSH does not directly measure tissue-specific T3 generation. At the same time, a normal TSH should not be taken as proof that a neuron or other tissue is clinically “hypothyroid.” The degree of clinically important tissue-level decoupling in ordinary nutritional selenium deficiency is not captured by a single validated threshold.
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.