Is EPOR p.Thr440= (c.1320A>G) pathogenic?

EPOR p.Thr440= (c.1320A>G) is classified Likely benign in EPOR (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-30). Absent from gnomAD v4.1; Associated with primary familial polycythemia due to EPO receptor mutation.

What condition is associated with EPOR p.Thr440= (c.1320A>G)?

EPOR p.Thr440= (c.1320A>G) is associated with primary familial polycythemia due to EPO receptor mutation (ClinVar).

How common is EPOR p.Thr440= (c.1320A>G) in the general population?

EPOR p.Thr440= (c.1320A>G) is absent from gnomAD v4.1 (gnomAD).

How is Primary familial polycythemia inherited?

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

EPOR p.Thr440=

c.1320A>G · VCV4686000

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

primary familial polycythemia due to EPO receptor mutation

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 -4.9	GERP -3.7
Overall
CADD	0.405	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: EPOR
Protein: p.Thr440=
Coding: c.1320A>G
MANE Select: NM_000121
Type: single nucleotide variant
Location: chr19:11378191 (GRCh38)
Gene constraint: LOEUF 0.787 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 67.74 · 22 PDB

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.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
EPOR p.Ala219= Benign ★★ same condition
EPOR p.Arg56= 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-thr440 (accessed [today's date]).

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