FCER1A Gene

What is the FCER1A gene?

FCER1A encodes fc epsilon receptor ia, a protein involved in IgE receptor / mast cell and basophil activation. It belongs to the Immune Signaling category and is part of the Histamine & MCAS biological cluster. FCER1A encodes the alpha subunit of the high-affinity IgE receptor, which binds IgE on mast cells and basophils to initiate allergic responses.

Biological role and pathway

FCER1A is involved in the IgE receptor / mast cell and basophil activation pathway, which plays a central role in regulating physiological processes relevant to immune defence, cellular energy, and systemic homeostasis. Genes within the Histamine & MCAS 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 FCER1A gene have been studied in relation to immune signaling and chronic illness. Each variant represents a single nucleotide position where individuals may carry different alleles.

• rs2251746— FCER1A variant
• rs2427837— FCER1A variant

Conditions studied in relation to FCER1A

Research into FCER1A variants has explored associations with the following conditions. These are areas of scientific investigation and do not imply that FCER1A 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 FCER1A and related genes in the histamine & mcas 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 Histamine & MCAS pathway

FCER1A 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