rs1799946
Variant in the DEFB1 gene (Defensin Beta 1)
rs1799946 is a single nucleotide polymorphism (SNP) in the DEFB1 gene, involved in epithelial antimicrobial defense. Variants at this position have been studied in relation to immune function, metabolism, and chronic illness.
This page is for educational and informational purposes only. Not a diagnostic tool. Always consult a qualified healthcare provider.
What is the rs1799946 variant?
rs1799946 is a SNP (single nucleotide polymorphism) in the DEFB1 (Defensin Beta 1) gene. It belongs to the Immune Signaling category and is part of the Viral Defense & Interferon Response biological cluster. DEFB1 encodes beta-defensin 1, a constitutively expressed antimicrobial peptide of epithelial surfaces including the respiratory tract.
Biological role and pathway
This variant sits within the DEFB1 gene, which is involved in the epithelial antimicrobial defense pathway. Genes within the Viral Defense & Interferon Response 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 — particularly under conditions of physiological stress such as viral infection or prolonged illness.
rs1799946 and Long COVID / ME-CFS research
Beta-defensin 1 at the respiratory epithelium provides first-line antimicrobial defense; variants may affect susceptibility to SARS-CoV-2 infection and Long COVID.
This information is based on published research and does not constitute medical advice. See references below.
Parent gene: DEFB1
rs1799946 is one of 3 known variants in the DEFB1 gene. To understand the full biological context of this variant, explore the parent gene page.
View DEFB1 gene page →Conditions studied in relation to rs1799946
Research into DEFB1 variants including rs1799946 has explored associations with the following conditions. These are areas of scientific investigation and do not imply causation.
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 DEFB1 and the rs1799946 variant.
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.
Other variants in the DEFB1 gene
The following variants in DEFB1 are also studied in relation to chronic illness and may be analysed together for a more complete picture.
Frequently asked questions
What is the rs1799946 variant in the DEFB1 gene?
rs1799946 is a single nucleotide polymorphism (SNP) located in the DEFB1 (Defensin Beta 1) gene, which is involved in epithelial antimicrobial defense. DEFB1 encodes beta-defensin 1, a constitutively expressed antimicrobial peptide of epithelial surfaces including the respiratory tract.
How may the rs1799946 variant relate to Long COVID or ME/CFS?
Beta-defensin 1 at the respiratory epithelium provides first-line antimicrobial defense; variants may affect susceptibility to SARS-CoV-2 infection and Long COVID.
Can a consumer DNA test detect the rs1799946 variant?
Many consumer DNA tests such as 23andMe, AncestryDNA, and MyHeritage genotype common SNPs. ChronicDNA analyses your raw DNA file and reports on variants studied in relation to chronic illness, immune function, and metabolism. This is not a diagnostic service — results are informational and educational only.
Find out if you carry the rs1799946 variant
Upload your DNA data from 23andMe, AncestryDNA, or MyHeritage and receive a personalised report covering >80 genes relevant to Long COVID and ME/CFS.
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References
The following publications were used in compiling the research context for DEFB1 and its variants. This is not an exhaustive literature review.
- [1]PMID: 32217835
- [2]Nature Genetics
- [3]Journal of Infectious Diseases