Is EPOR p.Pro380Ala (c.1138C>G) pathogenic?

EPOR p.Pro380Ala (c.1138C>G) is classified Benign in EPOR (ClinVar, Multiple submitters, 7 submitters; last evaluated 2026-01-07). AlphaMissense: likely benign (0.0706); Common (popmax 20%, afr) — too common for a highly-penetrant pathogenic allele; Associated with primary familial polycythemia due to EPO receptor mutation.

What condition is associated with EPOR p.Pro380Ala (c.1138C>G)?

EPOR p.Pro380Ala (c.1138C>G) is associated with primary familial polycythemia due to EPO receptor mutation (ClinVar).

How is Primary familial polycythemia inherited?

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

What do computational predictors say about EPOR p.Pro380Ala (c.1138C>G)?

AlphaMissense predicts likely benign (score 0.0706) — an in-silico prediction, not a clinical call.

EPOR p.Pro380Ala

Q: How common is EPOR p.Pro380Ala (c.1138C>G) in the general population?

EPOR p.Pro380Ala (c.1138C>G) is common (popmax 20%, afr) — too common for a highly-penetrant pathogenic allele (gnomAD).

c.1138C>G · rs35423344 · VCV328143

Benign Multiple submitters

Classification

Benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 7 submitters

AlphaMissense

likely benign

0.0706 · ACMG-weighted

gnomAD v4.1

Common

common (popmax 20%, afr) — too common for a highly-penetrant pathogenic allele

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

primary familial polycythemia due to EPO receptor mutation

Computational evidence

Protein change
AlphaMissense	0.0706	likely benign
REVEL	0.143	moderately benign-leaning
SaProt	LLR -6.85	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.9, phastCons 1
Regional constraint	o/e 0.89	unconstrained · MANE · 6,220 bp · p 0.0057 · regional, not allelic
Overall
CADD	19.49	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 20% African / African-American · 14,960/74,974 alleles

Filtering AF 19.7% ClinGen BA1/BS1 input FAF95, joint · FAF99 19.6%

Overall 1.07% 17,236/1,613,328 alleles · common

Ancestry group	Frequency	1 in
African / African-Americangrpmax	20%	5
Remaining individualsnot grpmax-eligible	1.47%	68
Middle Eastern	1.4%	71
Admixed American	1.28%	78
South Asian	0.045%	2,221
European (non-Finnish)	0.039%	2,565
Finnishnot grpmax-eligible	0.00474%	21,098

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: EPOR
Protein: p.Pro380Ala
Coding: c.1138C>G
MANE Select: NM_000121
dbSNP: rs35423344
Type: single nucleotide variant
Location: chr19:11378373 (GRCh38)
Gene constraint: LOEUF 0.787 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 67.74 · 22 PDB
Residue 380: a UniProt-annotated variant site (in)

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

Disease context

primary familial polycythemia due to EPO receptor mutation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Primary familial polycythemia (Orphanet):

Inheritance: Autosomal dominant
Onset: All ages

Similar variants

EPOR p.Pro380Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
EPOR p.Pro380= Likely benign ★ same residue
EPOR p.Trp439Ter Pathogenic ★★ same condition
EPOR p.Pro327Leu Uncertain significance ★★ ⚠ same condition
EPOR c.115+7A>G Benign/Likely benign ★★ same condition
EPOR c.-55G>A Benign ★★ same condition
EPOR c.*35G>A Benign ★★ same condition
EPOR p.Ala186= Benign/Likely benign ★★ 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/epor-p-pro380ala (accessed [today's date]).

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