BRS1(FM1) - Catecholaminergic Function (Dopamine + Norepinephrine)
1. Definition
Provision and brain-delivery context of catecholamine precursors and signalling support for dopamine- and norepinephrine-related motivation, attention, arousal, and executive function.
2. Functional Outcome Context
These outcomes describe translational contexts for the FM as an integrated biological capacity. They are not single-mechanism treatment claims. Confidence may increase where multiple child PMs converge on the same functional outcome.
No functional outcome context currently mapped.
3. Intervention Breakdown
Food-State Leaning
4. Functional Role
↑ precursor availability; ↑ tyrosine/tryptophan support; improved brain-delivery context
5. Mechanistic Basis (Integrated FM Narrative)
Catecholaminergic function emerges from the coordinated interaction of several primary mechanisms and supporting biological pools.
5.1 Core Primary Mechanisms
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BRS1-FM1-PM1 — Amino-Acid Availability & Prioritisation Meal-level regulation of amino-acid pool sufficiency, completeness, and dietary prioritisation toward brain-relevant amino-acid availability.
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BRS1-FM2-PM3 — LAT1 Competitive Transport Modulation Meal composition shifts large neutral amino-acid (LNAA) competition at the blood–brain barrier LAT1 transporter and alters precursor entry conditions.
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BRS1-FM1-PM2 — Noradrenergic Signalling (Attention & Executive Modulation) Regulation of attention, arousal, and executive function via norepinephrine signalling pathways.
5.2 Supporting Biological Pools (Key Constraints)
- BRS1(KC2) — Amino Acid Quality & Competitive Balance Provides the shared amino-acid quality and balance pool required for indispensable amino-acid completeness, LNAA ratios, and competitive transport context across multiple BRS1 mechanisms.
5.3 Integrated Functional Narrative
Together, these PMs operationalise BRS1(FM1) as coordinated meal-level control of catecholaminergic and related neurotransmitter signalling.
5.4 Functional Failure Modes
Catecholaminergic function may weaken when amino acid quality & competitive balance declines or when reliance on incomplete protein sources without complementary pairing.
Reliance on incomplete protein sources without complementary pairing may reduce BRS1(KC2) — Amino Acid Quality & Competitive Balance. Chronically low indispensable amino-acid coverage across meals may further strain pool availability, lNAA imbalance favouring transport competition away from key precursors, ultra-processed low-protein dietary patterns, while inconsistent protein distribution across the day.
These pressures may impair BRS1-FM1-PM1 — Amino-Acid Availability & Prioritisation, weaken BRS1-FM2-PM3 — LAT1 Competitive Transport Modulation, and reduce the effectiveness of BRS1-FM1-PM2 — Noradrenergic Signalling (Attention & Executive Modulation). At the FM level, this may shift BRS1(FM1) toward reduced catecholaminergic function performance.
6. Connected Mechanisms
- None listed