Is C3 p.Asn247= (c.741C>T) pathogenic?

C3 p.Asn247= (c.741C>T) is classified Benign/Likely benign in C3 (ClinVar, Multiple submitters, 10 submitters; last evaluated 2026-02-04). Low-frequency (popmax 1.73%, nfe); Associated with atypical hemolytic-uremic syndrome.

What condition is associated with C3 p.Asn247= (c.741C>T)?

C3 p.Asn247= (c.741C>T) is associated with atypical hemolytic-uremic syndrome, age related macular degeneration 9, atypical hemolytic-uremic syndrome with C3 anomaly (ClinVar).

How common is C3 p.Asn247= (c.741C>T) in the general population?

C3 p.Asn247= (c.741C>T) is low-frequency (popmax 1.73%, nfe) (gnomAD).

How is Atypical hemolytic uremic syndrome inherited?

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

C3 p.Asn247=

c.741C>T · rs11569571 · VCV330336

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 10 submitters

gnomAD v4.1

Rare

low-frequency (popmax 1.73%, nfe)

Conditions

atypical hemolytic-uremic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.12	GERP -3.5, phastCons 0.63
Overall
CADD	2.949	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 1.73% European (non-Finnish) · 20,354/1,178,764 alleles

Filtering AF 1.71% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.7%

Overall 1.4% 22,612/1,609,592 alleles · low-frequency

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	1.73%	58
Amishnot grpmax-eligible	1.22%	82
Remaining individualsnot grpmax-eligible	1.18%	85
Finnishnot grpmax-eligible	0.972%	103
Ashkenazi Jewishnot grpmax-eligible	0.463%	216
Admixed American	0.435%	230
South Asian	0.364%	274
African / African-American	0.213%	469
Middle Eastern	0.132%	757
East Asian	0.00894%	11,190

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.Asn247=
Coding: c.741C>T
MANE Select: NM_000064
dbSNP: rs11569571
Type: single nucleotide variant
Location: chr19:6714024 (GRCh38)
Gene constraint: LOEUF 0.541 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 79.84 · 80 PDB

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

Disease context

atypical hemolytic-uremic syndrome — 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 complement component 3 deficiency

For Atypical hemolytic uremic syndrome (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Not applicable
Onset: All ages
Prevalence: 1-9 / 1 000 000 (United States)

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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
C3 p.Ile1157Thr 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-asn247 (accessed [today's date]).

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