Is EPAS1 p.Ala22= (c.66T>C) pathogenic?

EPAS1 p.Ala22= (c.66T>C) is classified Likely benign in EPAS1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-03-12). Ultra-rare (popmax 0.0164%, mid); Associated with Inborn genetic diseases.

What condition is associated with EPAS1 p.Ala22= (c.66T>C)?

EPAS1 p.Ala22= (c.66T>C) is associated with Inborn genetic diseases (ClinVar).

How common is EPAS1 p.Ala22= (c.66T>C) in the general population?

EPAS1 p.Ala22= (c.66T>C) is ultra-rare (popmax 0.0164%, mid) (gnomAD).

EPAS1 p.Ala22=

c.66T>C · rs749668860 · VCV1754998

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0164%, mid)

Conditions

Inborn genetic diseases

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 -12	GERP -5.6
Overall
CADD	0.156	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0164% Middle Eastern · 1/6,084 alleles

Filtering AF 0.000953% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000787%

Overall 0.00118% 19/1,614,080 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0164%	6,084
European (non-Finnish)	0.00153%	65,558

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: EPAS1
Protein: p.Ala22=
Coding: c.66T>C
MANE Select: NM_001430
dbSNP: rs749668860
Type: single nucleotide variant
Location: chr2:46346912 (GRCh38)
Gene constraint: LOEUF 0.366 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 59.41 · 43 PDB
Residue 22: the bhlh domain; the 'disordered' region

Full EPAS1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

EPAS1 p.Ala22Val Uncertain significance ★ ⚠ same residue
EPAS1 p.Ala439Gly Uncertain significance ★★ ⚠ same condition
EPAS1 p.Ala463Thr Uncertain significance ★★ ⚠ same condition
EPAS1 p.Ala698Pro Uncertain significance ★★ ⚠ same condition
EPAS1 p.Ala758Thr Uncertain significance ★★ ⚠ same condition
EPAS1 p.Ala81Thr Uncertain significance ★★ ⚠ same condition
EPAS1 p.Ala83Asp Uncertain significance ★★ ⚠ same condition
EPAS1 p.Ala94Val Uncertain significance ★★ ⚠ 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/epas1-p-ala22 (accessed [today's date]).

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