FCGR2A

Chr 1ADAR

Fc gamma receptor IIa

Binds to the Fc region of immunoglobulins gamma. Low affinity receptor. By binding to IgG it initiates cellular responses against pathogens and soluble antigens. Promotes phagocytosis of opsonized antigens

OMIMResearchGenerating clinical summary…
MultiplemechanismAD/ARLOEUF 1.353 OMIM phenotypes
Clinical SummaryFCGR2A
Population Constraint (gnomAD)
Low constraint (pLI 0.00) — loss-of-function variants are relatively tolerated in the population.
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Clinical Trials
2 active or recruiting trials — potential therapeutic options may be available
Some data sources returned errors (1)

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Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

Tolerant — LoF & missense variants common in population
LoF Constraint?
1.35LOEUF
pLI 0.000
Z-score 0.67
OE 0.79 (0.491.35)
Tolerant

Highly tolerant — LoF variants common in population

Missense Constraint?
0.35Z-score
OE missense 0.92 (0.811.05)
161 obs / 174.1 exp
Tolerant

Mild missense constraint

Observed / Expected Ratios?
LoF OE?0.79 (0.491.35)
00.351.4
Missense OE?0.92 (0.811.05)
00.61.4
Synonymous OE?1.18
01.21.6
LoF obs/exp: 10 / 12.6Missense obs/exp: 161 / 174.1Syn Z: -1.16

This gene — mechanism propensity

DN
0.82top 10%
GOF
0.74top 25%
LOF
0.2092th %ile

This gene has evidence for multiple mechanisms of pathogenicity (dominant-negative and gain-of-function). Both the Badonyi & Marsh prediction and the broader genomic evidence point to dominant-negative as the predominant mechanism. Different variants in this gene may act through different mechanisms — interpret in context of the specific variant.

DNprediction above median
GOFprediction above median

Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.

Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.

ClinVar Variant Classifications

0 submitted variants in ClinVar

Protein Context — Lollipop Plot

FCGR2A · protein map & ClinVar variants

Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.