Is ERN1 p.Lys341Arg (c.1022A>G) pathogenic?

ERN1 p.Lys341Arg (c.1022A>G) is classified Uncertain significance in ERN1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-02-12). AlphaMissense: likely benign (0.0763); Ultra-rare (popmax 0.0468%, eas).

How common is ERN1 p.Lys341Arg (c.1022A>G) in the general population?

ERN1 p.Lys341Arg (c.1022A>G) is ultra-rare (popmax 0.0468%, eas) (gnomAD).

What do computational predictors say about ERN1 p.Lys341Arg (c.1022A>G)?

AlphaMissense predicts likely benign (score 0.0763) — an in-silico prediction, not a clinical call.

ERN1 p.Lys341Arg

c.1022A>G · rs371802368 · VCV3090317

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0763 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0468%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0763	likely benign
REVEL	0.223	benign-leaning
SaProt	LLR -6.94	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 7.8	GERP 2.1, phastCons 1
Regional constraint	o/e 0.79	unconstrained · MANE · 72 kb · p 4e-07 · regional, not allelic
Overall
CADD	21.9	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0468% East Asian · 21/44,904 alleles

Filtering AF 0.0313% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0262%

Overall 0.00192% 31/1,613,848 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0468%	2,138
Remaining individualsnot grpmax-eligible	0.0128%	7,808
European (non-Finnish)	0.00017%	589,936

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: ERN1
Protein: p.Lys341Arg
Coding: c.1022A>G
MANE Select: NM_001433
dbSNP: rs371802368
Type: single nucleotide variant
Location: chr17:64064051 (GRCh38)
Gene constraint: LOEUF 0.498 · pLI 0.95 (gnomAD)
Structure: AlphaFold pLDDT 73.50 · 26 PDB

Full ERN1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ERN1 p.Leu786= Benign ★★ same type
ERN1 p.Pro550Arg Benign ★★ same type
ERN1 p.Ala427Thr Uncertain significance ★ ⚠ same type
ERN1 p.Ala431Pro Uncertain significance ★ ⚠ same type
ERN1 p.Ala435Asp Uncertain significance ★ ⚠ same type
ERN1 p.Ala435Thr Uncertain significance ★ ⚠ same type
ERN1 p.Ala435Val Uncertain significance ★ ⚠ same type
ERN1 p.Ala641Gly Uncertain significance ★ ⚠ same type

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/ern1-p-lys341arg (accessed [today's date]).

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