USP18 Gene

What is the USP18 gene?

USP18 encodes ubiquitin specific peptidase 18, a protein involved in interferon regulation. It belongs to the Innate Immunity category and is part of the Innate Immunity & Interferons biological cluster. USP18 is a negative regulator of type I interferon signaling that cleaves ISG15 conjugates and directly inhibits JAK1 association with IFNAR2. Inherited USP18 deficiency causes severe type I interferonopathy.

Biological role and pathway

USP18 is involved in the interferon regulation pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Innate Immunity & Interferons 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 USP18 gene have been studied in relation to innate immunity and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs2240896— USP18 variant
• rs12628— USP18 variant
• rs67939904— USP18 variant

Conditions studied in relation to USP18

Research into USP18 variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that USP18 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 USP18 and related genes in the innate immunity & interferons 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 Innate Immunity & Interferons pathway

USP18 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