Cardiovascular Pathway
Summary
The cardiovascular system is the body's logistics network — delivering oxygen, nutrients, hormones, and immune cells to every tissue while clearing metabolic waste. Genetic variation across this system affects three fundamentally different risk domains that most people (and most genetic reports) conflate:
Evidence detail
System Overview
The cardiovascular system is the body's logistics network — delivering oxygen, nutrients, hormones, and immune cells to every tissue while clearing metabolic waste. Genetic variation across this system affects three fundamentally different risk domains that most people (and most genetic reports) conflate:
1. Vascular tone and blood pressure (ACE, AGT, AGTR1, GNB3, ADRB1): The renin-angiotensin-aldosterone system (RAAS) controls blood vessel constriction, sodium retention, and fluid balance. The adrenergic system controls heart rate and cardiac output. These five genes determine your baseline blood pressure set point and how strongly your cardiovascular system reacts to stress, exercise, sodium, and medication.
2. Lipid metabolism and atherosclerosis (APOE): How your body processes cholesterol, triglycerides, and lipoproteins. APOE genotype affects lifetime cardiovascular disease risk through lipid-mediated mechanisms and — in the case of ε4 — neurodegeneration risk.
3. Clotting and thrombosis (Factor V Leiden, F2 Prothrombin): Completely separate from blood pressure and lipids. These variants affect how your blood forms clots — relevant for DVT, pulmonary embolism, stroke, and decisions about hormonal contraception, surgery, and long-haul travel.
Why the compound picture matters: A user with high ACE + high AGT + enhanced GNB3 + enhanced ADRB1 has a fundamentally different cardiovascular profile than someone with just one of these variants. The individual entries give specific actions per gene. This hub captures the compound interactions — where multiple unfavourable findings create emergent risk that no single entry describes, and where the priority ordering of interventions shifts based on the combination.
Cross-System Connections
| External System | Gene(s) | How It Connects |
|----------------|---------|-----------------|
| System 1: Methylation | MTHFR (rs1801133) | MTHFR TT → elevated homocysteine → vascular damage and accelerated atherosclerosis. Homocysteine is an independent cardiovascular risk factor that compounds any lipid or BP-related genetic risk. Methylfolate supplementation addresses this. |
| System 3: Neurotransmitters | COMT (rs4680) | COMT Met/Met → slow catecholamine clearance → prolonged sympathetic activation. Compounds ADRB1 Arg/Arg and any RAAS amplification. The cardiovascular stress response is partly determined by how long catecholamines persist, not just how the heart responds to them. |
| System 6: Lipid Metabolism | APOA2 (rs5082) | APOA2 AA → saturated fat sensitivity → higher BMI → increased cardiovascular burden. Compounds APOE ε4 (both worsen with high saturated fat). Mediterranean diet addresses both. |
| System 8: Inflammation | IL6 (rs1800795) | IL6 GG → higher baseline inflammation → accelerated atherosclerosis and vascular dysfunction. Chronic low-grade inflammation compounds every cardiovascular risk pathway in this hub. Anti-inflammatory diet and exercise address this. |
| System 12: Appetite & Weight | FTO (rs9939609) | FTO AA → obesity risk → hypertension, dyslipidaemia, diabetes. Obesity is the single largest modifiable cardiovascular risk factor. Compounds every BP and lipid variant in this hub through haemodynamic and metabolic mechanisms. |
| System 13: Pharmacogenomics | CYP2C9, VKORC1 | If anticoagulation needed (clotting variants): CYP2C9 and VKORC1 genotype determines warfarin sensitivity. If beta-blockers needed: ADRB1 Arg389Gly predicts response. If ACE inhibitors needed: ACE genotype may modulate response. |