Is CYBA p.Ala101= (c.303C>G) pathogenic?

CYBA p.Ala101= (c.303C>G) is classified Likely benign in CYBA (ClinVar, Single submitter, 1 submitter; last evaluated 2023-03-03). Very rare (popmax 8.67e-05%, nfe); Associated with granulomatous disease, chronic, autosomal recessive, cytochrome b-negative.

What condition is associated with CYBA p.Ala101= (c.303C>G)?

CYBA p.Ala101= (c.303C>G) is associated with granulomatous disease, chronic, autosomal recessive, cytochrome b-negative (ClinVar).

How common is CYBA p.Ala101= (c.303C>G) in the general population?

CYBA p.Ala101= (c.303C>G) is very rare (popmax 8.67e-05%, nfe) (gnomAD).

How is Chronic granulomatous disease inherited?

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

CYBA p.Ala101=

c.303C>G · rs768942360 · VCV2078361

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 8.67e-05%, nfe)

Conditions

granulomatous disease, chronic, autosomal recessive, cytochrome b-negative

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 -11	GERP -2.6
Overall
CADD	0.04	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.67e-05% European (non-Finnish) · 1/1,152,806 alleles

Overall 7.13e-05% 1/1,403,222 alleles · very rare

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: CYBA
Protein: p.Ala101=
Coding: c.303C>G
MANE Select: NM_000101
dbSNP: rs768942360
Type: single nucleotide variant
Location: chr16:88646182 (GRCh38)
Gene constraint: LOEUF 1.726 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.28 · 7 PDB
Residue 101: an α-helix

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

Disease context

granulomatous disease, chronic, autosomal recessive, cytochrome b-negative — 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

CYBA p.Ala101Thr Uncertain significance ★★ ⚠ same residue
CYBA p.Ala101Pro Uncertain significance ★ ⚠ same residue
CYBA c.128+2T>C Likely pathogenic ★★ same condition
CYBA c.204-2A>G Pathogenic/Likely pathogenic ★★ same condition
CYBA c.287+1G>T Pathogenic/Likely pathogenic ★★ same condition
CYBA c.287+2T>C Pathogenic/Likely pathogenic ★★ same condition
CYBA c.288-1G>T Pathogenic/Likely pathogenic ★★ same condition
CYBA c.369+1G>A 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/cyba-p-ala101 (accessed [today's date]).

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