CD4 Gene

What is the CD4 gene?

CD4 encodes cd4 molecule, a protein involved in MHC class II T cell signaling. It belongs to the Lymphocyte category and is part of the Lymphocyte Biology biological cluster. CD4 encodes the co-receptor for MHC class II, expressed on helper T cells and macrophages; also serves as a SARS-CoV-2 entry receptor.

Biological role and pathway

CD4 is involved in the MHC class II T cell signaling pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Lymphocyte Biology 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 CD4 gene have been studied in relation to lymphocyte and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs2395471— CD4 variant

Conditions studied in relation to CD4

Research into CD4 variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that CD4 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 CD4 and related genes in the lymphocyte biology 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 Lymphocyte Biology pathway

CD4 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