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BRS2 — Methylation & One-Carbon Metabolism

BRS2(S1) - SNP-Sensitive Methylation Efficiency​

1. Definition​

Context-specific regulatory expression describing how variant-sensitive one-carbon metabolism may alter methylation efficiency, methyl-donor responsiveness, and downstream neurochemical tone — spanning MTHFR, COMT cross-talk, and BDNF Val66Met relevance — without redefining core BRS2 methylation mechanisms (BRS2(PM1), BRS2(PM3)).

2. Intervention Breakdown​

Food-State Leaning

3. Functional Role​

↑ methylation-efficiency support; ↑ cofactor sufficiency awareness; ↑ downstream neurochemical resilience support

4. Mechanistic Basis​

Summary​

Variant-sensitive efficiency can shift donor and cofactor responsiveness under the same remethylation and SAMe biology (BRS2(KC1), BRS2(PM1), BRS2(PM3), BRS2(FM1)). Outcomes vary by genotype and diet pattern; this SM explains why that variability matters.

Variant-sensitive pathways
  • MTHFR — folate, B2, and B12 sufficiency weigh more when folate-pathway efficiency is reduced [1]
  • COMT — catecholamine clearance may interact with methylation-adjacent meal patterns (BRS1) [2]
  • BDNF Val66Met — methionine–homocysteine and plasticity relevance downstream [2]
  • Omega-3 / polyphenols — membrane and resilience support alongside one-carbon inputs [3]

5. Underlying Mechanisms and Requirements​

5.1 Co-factors​

  • B2, folate, B12, omega-3

5.2 KCs (Key Constraints)​

5.3 Connected Primary Mechanisms (PMs)​

5.4 Connected Functional Mechanisms (FMs)​

  • BRSX — genotype-sensitive personalization
  • BRS1 — COMT / catecholamine cross-talk

6. Dietary Levers​

Diet

  • B12 ← dairy, seafood, liver

  • B2 ← eggs, dairy, leafy greens

  • Betaine ← beetroot, spinach

  • Choline ← eggs, liver

  • Folate ← leafy greens, legumes, liver

  • Methionine ← eggs, meat, fish

  • Omega-3 (EPA/DHA) ← oily fish, sardines, mackerel

  • Polyphenols ← berries, green tea, dark leafy greens

  • Stable dietary patterns prioritising methyl-donor continuity may support variant-sensitive responsiveness (meal-pattern lever; not a single-substrate map).

7. Lifestyle Levers​

Lifestyle
  • Consistent daily nutrient coverage
  • Sleep and stress recovery supporting metabolic resilience
  • Avoid genotype-driven high-dose nutrient interpretation

8. Scoreable Inputs & Modulation Signals​

Scoreable Input Categories
Input CategoryExample InputsBRS2(S1)
Functional Property Potentialsconsistent_methyl_donor_coverage; riboflavin_folate_context
Realised Functional Stateshomocysteine_modulation_context; omega3_status_context
Substance / Nutrient Signalsfolate; B12; B2; omega-3; methionine
Preparation Transformationsminimally_processed; whole_food_matrix

9. References​

  1. Aragão et al. (2024)
  2. Hünnerkopf et al. (2007)
  3. Ziaei et al. (2024)