Genetics of Endothelial Dysfunction
Endothelial dysfunction refers to impaired function of the cells lining blood vessels, including loss of vasodilatory capacity, increased pro-inflammatory and pro-thrombotic signalling, and compromised vascular barrier integrity. It is a key feature of Long COVID vascular pathology.
This page is for educational and informational purposes only. Not a diagnostic tool. Always consult a qualified healthcare provider.
What is Endothelial Dysfunction?
The endothelium — a single cell layer lining all blood vessels — performs critical regulatory functions including vasodilation, anti-coagulation, immune cell trafficking control, and vascular permeability regulation. Endothelial dysfunction, characterised by reduced nitric oxide bioavailability, increased expression of adhesion molecules, and pro-thrombotic changes, is an early manifestation of cardiovascular disease and has been documented in Long COVID patients even without prior cardiovascular risk factors. Genetic variants in NOS3, VCAM1, ICAM1, and thrombomodulin genes influence endothelial function and vulnerability to dysfunction under inflammatory conditions.
Biological pathways commonly discussed in relation to Endothelial Dysfunction
Research into Endothelial Dysfunction and Vascular Endothelial Health has highlighted several biological pathways that may be relevant. Genetic variants within these pathways may influence individual susceptibility, symptom severity, or the trajectory of the condition.
Nitric Oxide Signalling
eNOS (NOS3) produces nitric oxide, the primary vasodilatory molecule. Variants in NOS3 — particularly rs1799983 (Glu298Asp) — reduce eNOS activity, impairing vasodilation and endothelial protective function.
Endothelial Inflammation
Adhesion molecules (VCAM-1, ICAM-1, E-selectin) recruit immune cells to inflamed vessels. Variants in VCAM1, ICAM1, and SELE may influence the degree of endothelial inflammatory activation.
Vascular Permeability
Endothelial tight junctions control vascular permeability. Variants affecting VE-cadherin, occludin, and junctional signalling may alter barrier integrity under inflammatory stress.
Thromboregulation
Thrombomodulin (THBD) and EPCR on endothelial surfaces activate anticoagulant Protein C. Variants reducing these protective mechanisms may shift the endothelial surface towards a pro-thrombotic state.
Key genes studied in relation to Endothelial Dysfunction
The following genes have been studied in relation to Endothelial Dysfunction and Vascular Endothelial Health. These genes span the biological pathways most commonly discussed in this area of research.
16 genes total studied in relation to Endothelial Dysfunction across the ChronicDNA dataset.
Genetic variants commonly discussed
The following genetic variants (SNPs) are found in genes that have been studied in relation to Endothelial Dysfunction. Each variant represents a position in the genome where individuals may carry different alleles.
46 variants total across genes studied in relation to Endothelial Dysfunction.
How personal DNA data may provide educational insights
Consumer DNA files from 23andMe, AncestryDNA, and MyHeritage contain raw SNP data. When you upload your file to ChronicDNA, the analysis engine checks your genotype against a curated panel of 80+ genes selected for their relevance to Long COVID, ME/CFS, and connected biological pathways - some of which may relate to areas such as Endothelial Dysfunction.
This is not a diagnostic service. Genetic variants do not determine whether you have Endothelial Dysfunction, nor do they predict your clinical outcomes. The report is educational - it explains which variants you carry, what the research says about them, and how they fit into the biological pathways most relevant to chronic illness. All results should be discussed with a qualified healthcare provider.
Related conditions and pathways
Endothelial Dysfunction shares biological pathways and genetic associations with the following related conditions and areas of research.
Frequently asked questions
What is endothelial dysfunction and why is it relevant to Long COVID?
Endothelial dysfunction — impaired vascular endothelial regulation — has been documented in Long COVID patients. It may contribute to exercise intolerance, vascular symptoms, microclot formation, and multi-organ involvement through reduced vasodilation, increased inflammation, and pro-thrombotic vascular changes.
Which genes are most studied in endothelial function?
Key genes include NOS3, VCAM1, ICAM1, SELE, THBD, PECAM1, and VWF. These cover nitric oxide production, adhesion molecule expression, anticoagulant functions, and platelet-vessel interactions.
What is the NOS3 Glu298Asp variant?
The NOS3 rs1799983 variant (Glu298Asp) reduces eNOS enzyme activity, impairing nitric oxide production. It has been associated with increased cardiovascular risk in population studies and may modify endothelial vulnerability in the context of Long COVID.
How does endothelial dysfunction relate to fatigue?
Impaired endothelial vasodilation and microcirculatory dysfunction may reduce oxygen delivery to tissues, contributing to exercise intolerance and fatigue. This has been proposed as one mechanism underlying post-exertional malaise in Long COVID and ME/CFS.
Explore DNA insights
If you already have DNA data from 23andMe, AncestryDNA, or MyHeritage, upload your raw file to ChronicDNA and receive a personalised educational report covering genes studied in relation to Endothelial Dysfunction and connected biological pathways.
Get Your Personalised DNA ReportInformational and educational only · Not a diagnostic tool · GDPR compliant
16 genes · 46 variants analysed in relation to Endothelial Dysfunction