Is NCF2 p.Arg77= (c.229C>A) pathogenic?

NCF2 p.Arg77= (c.229C>A) is classified Likely benign in NCF2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-02-08). Very rare (popmax 0.00333%, amr); Associated with granulomatous disease, chronic, autosomal recessive, cytochrome b-positive, type 2.

How common is NCF2 p.Arg77= (c.229C>A) in the general population?

NCF2 p.Arg77= (c.229C>A) is very rare (popmax 0.00333%, amr) (gnomAD).

How is Chronic granulomatous disease inherited?

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

NCF2 p.Arg77=

Q: What condition is associated with NCF2 p.Arg77= (c.229C>A)?

NCF2 p.Arg77= (c.229C>A) is associated with granulomatous disease, chronic, autosomal recessive, cytochrome b-positive, type 2 (ClinVar).

c.229C>A · rs752901695 · VCV856195

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00333%, amr)

Conditions

granulomatous disease, chronic, autosomal recessive, cytochrome b-positive, type 2

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>A here scores Δ0.40 · evaluated, not missing
Constraint at this position
Conservation	phyloP 3	GERP 1.1, phastCons 1
Overall
CADD	10.17	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00333% Admixed American · 2/59,994 alleles

Filtering AF 0.000553% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000207%

Overall 0.000248% 4/1,613,930 alleles · very rare exomes 3/1,461,802 · genomes 1/152,128 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00333%	29,997
South Asian	0.0011%	91,082
European (non-Finnish)	8.47e-05%	1,179,960

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: NCF2
Protein: p.Arg77=
Coding: c.229C>A
MANE Select: NM_000433
dbSNP: rs752901695
Type: single nucleotide variant
Location: chr1:183586923 (GRCh38)
Gene constraint: LOEUF 0.799 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 78.99 · 7 PDB
Residue 77: a UniProt-annotated variant site (in cgd2); an α-helix

Full NCF2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

granulomatous disease, chronic, autosomal recessive, cytochrome b-positive, type 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Chronic granulomatous disease (Orphanet):

Inheritance: Autosomal recessive, X-linked recessive
Onset: Adolescent, Adult, Childhood, Infancy
Prevalence: 1-9 / 1 000 000 (Worldwide)

Similar variants

NCF2 p.Arg77Ter Pathogenic ★★ same residue
NCF2 p.Arg77Gln Uncertain significance ★★ same residue
NCF2 c.257+1G>A Pathogenic/Likely pathogenic ★★ same condition
NCF2 c.366+1G>A Pathogenic ★★ same condition
NCF2 c.714-2A>G Likely pathogenic ★★ same condition
NCF2 p.Ala202Val Pathogenic/Likely pathogenic ★★ same condition
NCF2 p.Arg102Ter Pathogenic ★★ same condition
NCF2 p.Arg184Ter 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/ncf2-p-arg77 (accessed [today's date]).

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