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BRS1 — Neurotransmitter Regulation

BRS1(SM-SNP1) - COMT Catecholamine Clearance Sensitivity​

1. Definition​

Variant-sensitive overlay describing how reduced COMT-mediated catecholamine clearance may increase sensitivity to tyrosine-rich meals, competitive LNAA transport, and noradrenergic arousal context. Genotype is discussed as modulating interpretation of stable BRS1(FM1) biology — not as a deterministic outcome predictor.

2. Target Functional Outcome / Phenome​

These mappings are translational relationships, not single-mechanism outcome claims. Phenomes are emergent functional patterns supported by multiple interacting PMs across the BRAIN Framework.

No direct functional outcome relationship currently mapped.

3. Intervention Breakdown​

Mixed Modulation

4. Functional Role​

↑ awareness of clearance–precursor coupling; ↑ meal-pattern stability for catecholamine context; ↓ mis-attribution of arousal solely to macronutrients

5. Mechanistic Basis​

Summary​

COMT metabolises catecholamines; lower activity genotypes are sometimes discussed alongside slower clearance and greater sensitivity to dietary tyrosine and meal timing. BRS1-FM1-PM1 and BRS1-FM2-PM4 remain the authoritative mechanism definitions; this SM applies variant context to their joint interpretation within BRS1(FM1).

COMT context, precursors, and transport — interpretive overlay

(Amino-acid pool — PM1)​

Meal-level amino-acid availability and prioritisation support catecholamine-relevant substrate context regardless of COMT genotype; insufficient pool sufficiency limits upstream context before transport and clearance → [Fernstrom, 2013]

(LNAA competition — PM2)​

Competitive LAT1 transport modulates relative brain entry of tyrosine versus tryptophan; meal composition may shift monoamine bias independently of COMT → [Fernstrom, 2013]

(Variant sensitivity without determinism)​

Where COMT activity is lower, the same meal patterns may be experienced as more arousal-prone because clearance is slower relative to synthesis and signalling context. This SM supports dietary pattern stability and cofactor adequacy — not genotype-based prescribing or diagnostic claims.

(Noradrenergic coupling)​

BRS1-FM1-PM2 links noradrenergic attention modulation; variant context may inform how aggressively to rely on tyrosine-forward meals versus balanced LNAA patterns.

6. Underlying Mechanisms and Requirements​

6.1 Cofactors and Supporting Inputs​

  • B6, iron, folate, vitamin C

6.2 KCs (Key Constraints)​

6.3 Connected Primary Mechanisms (PMs)​

6.4 Connected Functional Mechanisms (FMs)​

6.5 Connected Mechanisms​

  • BRS6 — Stress and glycaemic context modulating catecholamine tone

7. Dietary Levers​

Diet

  • Tyrosine ← poultry, eggs, dairy

  • B6 ← lentils, poultry, fish

  • Iron ← red meat, legumes, leafy greens

  • Folate ← leafy greens, legumes

  • Vitamin C ← citrus, peppers, berries

  • Balanced protein distribution rather than isolated high-tyrosine boluses may matter where clearance sensitivity is a concern (meal-pattern lever).

  • LNAA-aware meal pairing (carbohydrate quality, protein completeness) per BRS1-FM2-PM4 (meal-pattern lever).

8. Lifestyle Levers​

Lifestyle
  • Meal timing regularity to avoid stacked catecholamine precursor loads.
  • Stress and sleep recovery reducing concurrent noradrenergic drive.
  • Activity timing where exercise-induced catecholamine surges interact with clearance context.

9. Scoreable Inputs & Modulation Signals​

Scoreable Input Categories
Input CategoryExample InputsSM-SNP1 relevance
Functional Property Potentialslnna_transport_context; complete_protein_contextTransport and precursor scoring.
Realised Functional Statesbalanced_protein_mealStability-oriented meal states.
Substance / Nutrient Signalstyrosine; tryptophan; B6Connected PM1 signals.
Preparation Transformationscomplementary_protein_pairingAmino-acid balance at meals.

10. References​

  1. [Fernstrom, 2013]