Blood Pressure (Diastolic) and Your Genetics
Diastolic blood pressure is the lower of the two numbers in a blood pressure reading and reflects the pressure within arteries during the heart's relaxation phase between contractions. Like its systolic counterpart, diastolic blood pressure has a substantial heritable component documented across decades of genetic research. Large-scale genome-wide association studies (GWAS) have identified dozens of loci associated with diastolic blood pressure, illuminating the polygenic genetic architecture underlying vascular pressure regulation. This page summarizes what that research shows.
What is diastolic blood pressure?
A blood pressure reading is expressed as two values separated by a slash—for example, 120 over 80. The first, higher number is systolic blood pressure; the second, lower number is diastolic blood pressure. Diastolic pressure reflects the baseline force maintained within arterial walls when the heart is between beats: during cardiac diastole, the left ventricle relaxes and refills with blood while the elastic recoil of large arteries sustains forward blood flow to peripheral tissues.
Diastolic blood pressure is shaped by peripheral vascular resistance—the resistance encountered by blood flowing through the smaller arterioles throughout the body. When arteriolar tone is high (blood vessels are contracted), resistance increases and diastolic pressure tends to rise. When arteriolar tone is low (vessels are dilated), resistance decreases and diastolic pressure tends to fall. This relationship between vascular resistance and diastolic pressure is why many antihypertensive medications that dilate blood vessels preferentially lower diastolic readings.
The age trajectory of diastolic blood pressure differs from systolic. Diastolic pressure tends to rise during middle age alongside systolic, but in later adulthood it often plateaus or may decline even as systolic continues to rise. This creates a widening pulse pressure (the difference between systolic and diastolic values) in older populations, which reflects progressive arterial stiffening over the lifespan.
The genetics behind diastolic blood pressure
Diastolic blood pressure is a polygenic trait, meaning its level at the population scale is shaped by many common genetic variants each exerting small effects. The same large-scale GWAS that identified loci for systolic blood pressure also studied diastolic blood pressure, often finding overlapping but not identical sets of associated loci—consistent with the shared but partially distinct physiological determinants of the two measures.
Among the genes at loci associated with diastolic blood pressure in the research literature, ABO encodes the ABO blood group system enzyme responsible for biosynthesis of A and B blood group antigens on red blood cells and vascular endothelium. ABO blood group variants are among the best-replicated examples of a genetic locus with associations across multiple cardiovascular and hematological traits. ABO influences von Willebrand factor levels, endothelial biology, and inflammatory signaling in vessel walls—biological pathways relevant to vascular resistance and blood pressure regulation. Research has identified ABO variants in the context of blood pressure phenotypes in large GWAS.
ABLIM3 encodes an actin-binding LIM domain protein expressed in multiple tissues including cardiac and smooth muscle. Actin-based cytoskeletal structures are integral to smooth muscle cell function and contractility, and proteins that organize or regulate the actin cytoskeleton may influence vascular smooth muscle tone. Variants at the ABLIM3 locus have been associated with blood pressure measures in genetic studies.
ABCA7 encodes an ATP-binding cassette transporter involved in lipid transport and cellular cholesterol homeostasis. ABC transporters in the ABCA family mediate the movement of lipids across cell membranes, and lipid composition of vascular endothelial and smooth muscle cell membranes is a determinant of membrane fluidity, receptor function, and cellular signaling relevant to vascular biology.
The genetic architecture of diastolic blood pressure partially overlaps with systolic blood pressure, reflecting shared regulatory pathways, while also showing distinct locus associations that likely reflect the different physiological determinants of peak versus resting pressure.
What the research says
Research base: Robust
Diastolic blood pressure has been analyzed in the same large-scale GWAS as systolic blood pressure, with findings published across multiple consortium studies spanning more than a decade of research.
Early GWAS consortium analyses identified genome-wide significant loci associated with diastolic blood pressure across thousands of participants, establishing the polygenic genetic architecture and pointing to pathways in kidney function, vascular tone, and endothelial biology as central to blood pressure genetics (Author et al., 2009, PMID: 19430479; Author et al., 2009, PMID: 19430483).
Heritability estimates for diastolic blood pressure from twin and family studies are in the range of 30 to 55 percent. Like systolic blood pressure, diastolic heritability reflects hundreds of common variants rather than a handful of large-effect loci, making it a paradigmatic example of a complex polygenic trait.
Expanded meta-analyses covering data from hundreds of thousands of individuals across diverse ancestries substantially increased the number of identified diastolic blood pressure loci. These studies implicated regulatory pathways in adrenal, kidney, and vascular smooth muscle function, with multiple loci showing pleiotropic effects across blood pressure measures (Author et al., 2016, PMID: 27618452; Author et al., 2016, PMID: 27736895).
Polygenic scores for diastolic blood pressure are statistically associated with measured blood pressure values in independent validation cohorts, and also show correlations with related traits including kidney function measures and cardiovascular outcomes, reflecting the systemic effects of blood pressure genetic architecture.
How diastolic blood pressure affects you
A genetic tendency toward higher diastolic blood pressure represents a population-level statistical association from large GWAS studies—not a fixed individual prediction. The actual blood pressure measured for any individual reflects the combined influence of many genetic and environmental inputs, and the genetic contribution to blood pressure is highly modifiable through lifestyle interventions.
Diastolic blood pressure responds to many of the same lifestyle factors that influence systolic blood pressure: body weight, sodium intake, physical activity, alcohol consumption, and stress all have documented effects on diastolic readings. Additionally, factors that specifically affect peripheral vascular resistance—such as aerobic fitness level and dietary potassium intake—have particular relevance to diastolic pressure, given that peripheral resistance is its primary physiological determinant.
Working with your diastolic blood pressure profile
The ExomeDNA diastolic blood pressure result reflects genetic associations from large population GWAS and should be interpreted as a probabilistic tendency rather than a personal blood pressure measurement. The following lifestyle factors have the most consistent research evidence for influencing diastolic pressure:
- Regular aerobic exercise: Sustained aerobic activity lowers peripheral vascular resistance and is associated with reductions in both systolic and diastolic blood pressure. Effects are seen across a range of exercise intensities and durations in clinical research.
- Dietary potassium: Higher dietary potassium intake—from vegetables, fruits, and legumes—is associated with lower blood pressure, partly through effects on renal sodium excretion and vascular smooth muscle function.
- Sodium reduction: Dietary sodium restriction is one of the most evidence-supported dietary interventions for blood pressure and has documented effects on diastolic as well as systolic pressure.
- Alcohol moderation: Reducing heavy alcohol use is associated with meaningful reductions in diastolic blood pressure across controlled trials and observational studies.
- Stress management: Chronic psychological stress is associated with sustained sympathetic nervous system activation, which raises vascular resistance and blood pressure. Mindfulness, stress reduction, and adequate sleep may help support healthier diastolic levels.
For personalized guidance about blood pressure management, a healthcare professional is the appropriate resource.
Research base: Robust. This genetic association is supported by large-scale, replicated GWAS evidence from diverse populations. Association does not imply causation, and individual outcomes depend on many genetic and non-genetic factors. See our methodology page for how ExomeDNA evaluates evidence quality.
Related traits and genes
Diastolic blood pressure shares substantial genetic architecture with systolic blood pressure and pulse pressure. Loci identified for one blood pressure measure frequently reach significance for others, reflecting the integrated physiology of cardiovascular pressure regulation.
The ABO gene connects diastolic blood pressure genetics to endothelial biology, coagulation, and blood group biology—one of the best-replicated pleiotropic gene-phenotype relationships in human genetics. ABLIM3 links blood pressure genetics to actin cytoskeleton biology in smooth muscle. ABCA7 connects blood pressure research to lipid transport and membrane biology in vascular cells.
Related traits: Blood Pressure (Systolic) | Pulse Pressure | Heart Rate Tendency | Arterial Stiffness | HDL Cholesterol Tendency
Frequently asked questions
Is diastolic blood pressure genetic? Yes. Twin and family studies estimate that 30 to 55 percent of population variation in diastolic blood pressure is attributable to genetic factors. GWAS have identified dozens of loci associated with diastolic blood pressure, with ongoing discovery as sample sizes grow.
What genes are associated with diastolic blood pressure? Genes at GWAS-identified loci associated with diastolic blood pressure include ABO (the blood group enzyme with documented cardiovascular associations), ABLIM3 (an actin-binding protein expressed in smooth muscle), and ABCA7 (a lipid transporter with roles in membrane biology), among many others in pathways spanning kidney function, vascular tone, and endothelial signaling.
How does diastolic blood pressure differ from systolic in genetic architecture? Systolic and diastolic blood pressure share many GWAS loci, reflecting their shared physiological determinants. However, each measure also has distinct associated loci, consistent with the different biological factors that primarily determine peak (systolic) versus resting (diastolic) arterial pressure. Peripheral vascular resistance is a particularly important determinant of diastolic pressure.
Can lifestyle changes lower diastolic blood pressure? Yes. Regular aerobic exercise, dietary sodium reduction, higher dietary potassium intake, moderate alcohol consumption, and stress management all have documented effects on diastolic blood pressure in clinical research. These lifestyle factors influence peripheral vascular resistance, the primary physiological driver of diastolic pressure.
What is ABO and why does it appear in blood pressure genetics? ABO encodes the enzyme that determines ABO blood group antigens on red blood cells and vascular endothelium. Beyond blood typing, ABO variants influence von Willebrand factor levels, endothelial function, and inflammatory signaling—biological pathways that intersect with blood pressure regulation. The ABO locus is one of the best-replicated pleiotropic genetic associations in cardiovascular research.
Written by Scott Peeples, BS Biomedical Sciences | ExomeDNA Founder Reviewed by ExomeDNA Editorial Process
Results are not a clinical test, not a treatment recommendation, and not a substitute for professional healthcare. This page provides wellness education and is not a substitute for clinical care.
References
- Author et al. (2009). Genome-wide association study identifies loci associated with blood pressure. PMID: 19430479.
- Author et al. (2009). Genome-wide association identifies multiple blood pressure loci. PMID: 19430483.
- Author et al. (2011). Blood pressure GWAS meta-analysis. PMID: 21909115.
- Author et al. (2015). Blood pressure genetic architecture study. PMID: 26390057.
- Author et al. (2016). Large-scale genome-wide analysis of diastolic blood pressure. PMID: 27618452.
- Author et al. (2016). Multi-ancestry blood pressure GWAS. PMID: 27736895.
Data sources: GWAS Catalog | Open Targets | ClinVar | ClinGen