CLDN5 Gene

What is the CLDN5 gene?

CLDN5 encodes claudin 5, a protein involved in tight junction / blood-brain barrier integrity. It belongs to the Vascular category and is part of the Coagulation & Microcirculation biological cluster. CLDN5 encodes claudin-5, a critical tight junction protein at the blood-brain barrier that restricts paracellular passage.

Biological role and pathway

CLDN5 is involved in the tight junction / blood-brain barrier integrity pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Coagulation & Microcirculation cluster work together to maintain balanced function across interconnected biological systems.

Variants in genes within this pathway may influence an individual's predisposition to altered function in these systems — particularly under conditions of physiological stress such as viral infection or prolonged illness.

Known genetic variants

The following variants (SNPs) in the CLDN5 gene have been studied in relation to vascular and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs6539267— CLDN5 variant

Conditions studied in relation to CLDN5

Research into CLDN5 variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that CLDN5 causes or treats any condition.

Genetic insights from DNA data

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 include CLDN5 and related genes in the coagulation & microcirculation pathway.

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. Results are presented in plain English with appropriate scientific context, no medical jargon, no scare tactics. All results should be discussed with a qualified healthcare provider.

Related genes in the Coagulation & Microcirculation pathway

CLDN5 does not act in isolation. The following genes are functionally related and may be analysed together for a more complete picture of your genetic predispositions.

Frequently asked questions