Is C3 p.Arg573Gln (c.1718G>A) pathogenic?

C3 p.Arg573Gln (c.1718G>A) is classified Uncertain significance in C3 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-04-24). AlphaMissense: likely benign (0.0847); Very rare (popmax 0.00288%, nfe); Associated with complement component 3 deficiency.

What condition is associated with C3 p.Arg573Gln (c.1718G>A)?

C3 p.Arg573Gln (c.1718G>A) is associated with complement component 3 deficiency, age related macular degeneration 9, atypical hemolytic-uremic syndrome with C3 anomaly (ClinVar).

How common is C3 p.Arg573Gln (c.1718G>A) in the general population?

C3 p.Arg573Gln (c.1718G>A) is very rare (popmax 0.00288%, nfe) (gnomAD).

How is Complement component 3 deficiency inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about C3 p.Arg573Gln (c.1718G>A)?

AlphaMissense predicts likely benign (score 0.0847) — an in-silico prediction, not a clinical call.

C3 p.Arg573Gln

c.1718G>A · rs780877533 · VCV2982590

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.0847 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00288%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

complement component 3 deficiency

Computational evidence

Protein change
AlphaMissense	0.0847	likely benign
REVEL	0.055	moderately benign-leaning
SaProt	LLR -5.36	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.83	GERP -2.8
Regional constraint	o/e 0.74	unconstrained · MANE · 35 kb · p 3.5e-28 · regional, not allelic
Overall
CADD	10.33	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00288% European (non-Finnish) · 34/1,180,028 alleles

Filtering AF 0.00207% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00183%

Overall 0.00229% 37/1,613,782 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00288%	34,707
East Asian	0.00223%	44,872
Remaining individualsnot grpmax-eligible	0.0016%	62,484
African / African-American	0.00134%	74,852

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: C3
Protein: p.Arg573Gln
Coding: c.1718G>A
MANE Select: NM_000064
dbSNP: rs780877533
Type: single nucleotide variant
Location: chr19:6709811 (GRCh38)
Gene constraint: LOEUF 0.541 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.84 · 80 PDB
Residue 573: a β-strand; a disulfide bond

Full C3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

complement component 3 deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: age related macular degeneration 9 atypical hemolytic-uremic syndrome with C3 anomaly

For Complement component 3 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

C3 p.Arg573Leu Uncertain significance ★★ ⚠ same residue
C3 p.Arg573Trp Uncertain significance ★★ ⚠ same residue
C3 c.1003+1G>A Pathogenic/Likely pathogenic ★★ same condition
C3 c.2863+1G>T Likely pathogenic ★★ same condition
C3 c.4030-2A>G Likely pathogenic ★★ same condition
C3 p.Arg161Trp Pathogenic/Likely pathogenic ★★ ⚠ same condition
C3 p.Arg592Gln Pathogenic/Likely pathogenic ★★ ⚠ same condition
C3 p.Arg592Trp Likely pathogenic ★★ ⚠ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/c3-p-arg573gln (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown