Average Blood Pressure and Your Genetics

Written by Scott Peeples, BS Biomedical Sciences · ExomeDNA Founder

Research base: Robust.

Mean arterial pressure (MAP) — approximately diastolic blood pressure plus one-third of pulse pressure — represents the time-averaged force arteries sustain throughout the full cardiac cycle and is the primary determinant of organ perfusion pressure. Aggregated across nine independent GWAS spanning European, East Asian, and multi-ancestry cohorts — including studies by Kato et al. (2015), Liu et al. (2016), and Kanai et al. (2018) — 463 associated genes have been identified for MAP, making this the most comprehensively mapped blood pressure phenotype in this analysis series. Top-ranked signals include FGF5, SWAP70, INPP5A, FES, and AGT, spanning vascular smooth muscle growth factor signaling, calcium regulation, immune-vascular biology, and the renin-angiotensin-aldosterone system.

What is mean arterial pressure?

Mean arterial pressure is a time-averaged measure of the pressure arteries sustain throughout the full cardiac cycle. Unlike systolic or diastolic readings — which capture only peak or resting-phase pressure — MAP integrates the entire waveform, weighted by the longer duration of diastole. In clinical and research contexts, MAP is the most direct proxy for the sustained perfusion pressure experienced by organ capillary beds.

MAP rises when cardiac output increases, when peripheral vascular resistance rises, or when both occur together. The genetic architecture of MAP therefore reflects the combined biology of blood pressure regulation rather than only the systolic or diastolic component. This makes MAP genetics particularly useful for identifying pathways with broad cardiovascular relevance.

The genetics behind mean arterial pressure

Nine independent GWAS datasets together identify 463 associated genes for MAP — the most comprehensive blood pressure genetic map in this series. Top-ranked signals:

FGF5 (rank 1 by gene prioritization) encodes fibroblast growth factor 5, the most replicated blood-pressure locus across global populations. FGF5 influences vascular smooth muscle tone through paracrine signaling loops and appears at or near the top of gene rankings across virtually every blood pressure phenotype in this dataset, including MAP.

SWAP70 (rank 2) encodes a guanine nucleotide exchange factor for Rho family GTPases, expressed in B cells and involved in actin cytoskeletal remodeling. Rho GTPase signaling in vascular smooth muscle directly controls contractile force generation. SWAP70 frequently co-localizes with FGF5 near chromosome 4q21, suggesting the region harbors multiple regulatory elements influencing arterial tone.

INPP5A (rank 3) encodes inositol polyphosphate-5-phosphatase A, which degrades IP3 — the intracellular trigger for calcium release in smooth muscle. Reduced INPP5A activity leads to greater IP3 persistence and elevated calcium-mediated contraction, raising MAP through a mechanism upstream of L-type calcium channels.

FES (rank 4) encodes a non-receptor tyrosine kinase involved in cytokine signaling, innate immune activation, and myeloid cell differentiation. FES reinforces the immune-vascular inflammatory axis as a MAP determinant, consistent with its appearance across diastolic and MAP phenotypes.

AGT (rank 5) encodes angiotensinogen, the RAAS precursor and one of the most replicated blood pressure loci in human genetics. Its strong signal across both systolic and diastolic BP phenotypes naturally combines into a robust MAP association.

Additional associated genes include ADO (cysteamine dioxygenase; taurine biosynthesis pathway with vasodilatory relevance), ADRB1 (beta-1 adrenergic receptor, direct target of beta-blocker antihypertensives), ALDH2 (mitochondrial aldehyde dehydrogenase, a major East Asian pharmacogenomics locus), ABCC8 (SUR1, the sulfonylurea receptor subunit of KATP channels, expressed in both pancreatic beta cells and vascular smooth muscle), and ADCY10 (adenylyl cyclase 10, a bicarbonate-responsive enzyme regulating intracellular cAMP).

Research snapshot: 463 genes identified for mean arterial pressure aggregated across nine GWAS studies. FGF5, INPP5A, FES, and AGT are among the top-ranked signals. Research base: Robust.

What the research says

The nine source studies span a decade of MAP genetics, from Kato et al. (2015) — the first large trans-ancestry blood pressure GWAS linking methylation pathways — through Liu et al. (2016), which identified variants overlapping metabolic loci, and Kanai et al. (2018), which added Japanese population signals linking cell-type-specific biology to cardiovascular phenotypes. The 463-gene set represents aggregated evidence across diverse study designs, ancestry groups, and sample sizes.

The Robust designation reflects deep cross-study replication, multi-ancestry validation, and the inclusion of top-ranked genes (AGT, FGF5) with decades of independent biological and pharmacological support. MAP's integrative nature — absorbing both systolic and diastolic BP genetics — means its genetic architecture is necessarily broader than either component in isolation.

How mean arterial pressure affects you

MAP is the pressure that determines organ perfusion. Sustained MAP elevation progressively damages the microcirculation supplying the kidneys, retina, heart, and brain. The FES and SWAP70 signals in MAP genetics reflect an immune-vascular inflammatory dimension: chronic arterial wall inflammation raises peripheral resistance and shifts MAP upward independent of classical RAAS and calcium-channel mechanisms.

MAP and organ perfusion: Mean arterial pressure is the primary physiological determinant of tissue blood flow. For this reason, MAP targets — not systolic pressure alone — guide clinical management of critical illness, stroke, and severe hypertension in hospital settings.

The ABCC8 signal is notable: ABCC8 encodes the SUR1 regulatory subunit of KATP channels. In pancreatic beta cells this channel is the target of sulfonylurea diabetes medications. KATP channels also regulate vascular smooth muscle tone; ABCC8 variants may modulate vascular KATP activity and MAP independent of pancreatic effects.

Working with your variant profile

Lifestyle strategies with the broadest MAP-lowering evidence include sodium restriction, the DASH dietary pattern, aerobic exercise, weight management, and stress reduction. For individuals whose results highlight AGT or FES signals, the RAAS and immune-vascular axes are particularly relevant. Consult a licensed healthcare provider about pharmacological options.

Related traits and genes

• Systolic blood pressure — shares FGF5, SWAP70, AGT, and many other top loci
• Diastolic blood pressure — shares INPP5A, FES, AGT, ADO, and other signals
• Pulse pressure — the systolic-minus-diastolic difference; shares arterial stiffness biology
• Coronary artery disease — AGT, FES, and multiple MAP loci overlap with CAD risk
• Type 2 diabetes — ABCC8 (SUR1) and ALDH2 signals overlap with metabolic disease genetics

Frequently asked questions

What is mean arterial pressure? MAP is the time-averaged pressure arteries sustain throughout the cardiac cycle, calculated approximately as diastolic BP plus one-third of pulse pressure. It represents the average force driving blood through organ capillary beds and is the most clinically informative single blood pressure number for assessing tissue perfusion.

Why does MAP have 463 associated genes? MAP combines systolic and diastolic pressure biology, inheriting signals from both components plus their shared determinants. The 463-gene count reflects nine independent studies aggregated over a decade, capturing signals that no single study could detect alone.

What is SWAP70 and why does it appear in MAP genetics? SWAP70 is a guanine nucleotide exchange factor that activates Rho GTPases controlling actin cytoskeletal organization. In vascular smooth muscle, Rho GTPase activity directly modulates contractile force. SWAP70 frequently co-localizes with FGF5 at chromosome 4q21, suggesting this region harbors multiple regulatory elements influencing arterial tone.

How does ABCC8 relate to blood pressure? ABCC8 encodes SUR1, the regulatory subunit of KATP channels. These channels regulate electrical excitability in multiple tissues including vascular smooth muscle, where KATP opening causes hyperpolarization and vasodilation. ABCC8 variants that shift vascular KATP gating may alter resting smooth muscle membrane potential and MAP.

How are FGF5 and SWAP70 related in blood pressure genetics? FGF5 and SWAP70 lie close to each other on chromosome 4 and often appear together in blood pressure GWAS. Their co-localization may reflect a shared regulatory element or independent signals at adjacent loci. Both genes have plausible vascular mechanisms: FGF5 through smooth muscle growth factor signaling, SWAP70 through Rho GTPase-mediated contractility.

Why does MAP have a different gene count than individual systolic or diastolic BP? MAP aggregates genetic signals from the full cardiac pressure waveform. Variants affecting both SBP and DBP simultaneously — particularly those in the RAAS and calcium-handling pathways — contribute additively to MAP significance, producing a broader gene count than either component phenotype alone.

References:

1. Kato N et al. (2015). PMID 26390057. Nat Genet.
2. Liu C et al. (2016). PMID 27618448. Nat Genet.
3. Kanai M et al. (2018). PMID 29403010. Nat Genet.