Is C3 p.Arg505His (c.1514G>A) pathogenic?

C3 p.Arg505His (c.1514G>A) is classified Uncertain significance in C3 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-01-29). AlphaMissense: likely benign (0.2075); Very rare (popmax 0.00167%, amr); Associated with atypical hemolytic-uremic syndrome with C3 anomaly.

What condition is associated with C3 p.Arg505His (c.1514G>A)?

C3 p.Arg505His (c.1514G>A) is associated with atypical hemolytic-uremic syndrome with C3 anomaly, age related macular degeneration 9, complement component 3 deficiency (ClinVar).

How common is C3 p.Arg505His (c.1514G>A) in the general population?

C3 p.Arg505His (c.1514G>A) is very rare (popmax 0.00167%, amr) (gnomAD).

What do computational predictors say about C3 p.Arg505His (c.1514G>A)?

AlphaMissense predicts likely benign (score 0.2075) — an in-silico prediction, not a clinical call.

C3 p.Arg505His

c.1514G>A · VCV3584159

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2075 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

atypical hemolytic-uremic syndrome with C3 anomaly

Computational evidence

Protein change
AlphaMissense	0.2075	likely benign
REVEL	0.305	indeterminate
SaProt	LLR -8.27	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.1	GERP -1.5, phastCons 1
Regional constraint	o/e 0.74	unconstrained · MANE · 35 kb · p 3.5e-28 · regional, not allelic
Overall
CADD	23.6	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 0.00167% Admixed American · 1/60,004 alleles

Filtering AF 0.000615% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000474%

Overall 0.000991% 16/1,613,816 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	60,004
Remaining individualsnot grpmax-eligible	0.0016%	62,480
European (non-Finnish)	0.0011%	90,770
South Asian	0.0011%	91,090

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.Arg505His
Coding: c.1514G>A
MANE Select: NM_000064
Type: single nucleotide variant
Location: chr19:6710811 (GRCh38)
Gene constraint: LOEUF 0.541 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.84 · 80 PDB
Residue 505: a β-strand

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

Disease context

atypical hemolytic-uremic syndrome with C3 anomaly — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: age related macular degeneration 9 complement component 3 deficiency

Similar variants

C3 p.Arg505Cys 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
C3 p.Arg764Ter Pathogenic/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-arg505his (accessed [today's date]).

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