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. Intervention Breakdown

Mixed Modulation

3. Functional Role

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

4. 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(PM1) and BRS1(PM2) remain the authoritative mechanism definitions; this SM applies variant context to their joint interpretation within BRS1(FM1).

COMT context, precursors, and transport — interpretive overlay

(Precursor supply unchanged — PM1)

Tyrosine from dietary protein supports catecholamine synthesis regardless of COMT genotype; insufficient supply limits substrate context → Wurtman et al. (2003) [1]

(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) [2]

(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(PM5) links noradrenergic attention modulation; variant context may inform how aggressively to rely on tyrosine-forward meals versus balanced LNAA patterns.

5. Underlying Mechanisms and Requirements

5.1 Co-factors

• B6, iron, folate, vitamin C

5.2 KCs (Key Constraints)

• BRS1(KC1) — Amino Acid Substrate Sufficiency
• BRS1(KC2) — Amino Acid Completeness & Balance

5.3 Connected Primary Mechanisms (PMs)

• BRS1(PM1) — Tyrosine / Tryptophan Precursor Supply
• BRS1(PM2) — LAT1 Competitive Transport Modulation
• BRS1(PM5) — Noradrenergic Signalling (Attention & Executive Modulation)

5.4 Connected Functional Mechanisms (FMs)

• BRS1(FM1) — Catecholaminergic Function (Dopamine + Norepinephrine)

5.5 Cross-BRS Links

• BRS6 — Stress and glycaemic context modulating catecholamine tone

6. 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(PM2) (meal-pattern lever).

7. 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.

8. Scoreable Inputs & Modulation Signals

Scoreable Input Categories

Input Category	Example Inputs	SM-SNP1 relevance
Functional Property Potentials	lnna_transport_context; complete_protein_context	Transport and precursor scoring.
Realised Functional States	balanced_protein_meal	Stability-oriented meal states.
Substance / Nutrient Signals	tyrosine; tryptophan; B6	Connected PM1 signals.
Preparation Transformations	complementary_protein_pairing	Amino-acid balance at meals.

9. References

1. Wurtman et al. (2003)
2. Fernstrom (2013)