Is ECE2 p.Gly656Ser (c.1966G>A) pathogenic?

ECE2 p.Gly656Ser (c.1966G>A) is classified Uncertain significance in ECE2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-12-18). AlphaMissense: likely pathogenic (0.7965); Rare (popmax 0.346%, mid).

How common is ECE2 p.Gly656Ser (c.1966G>A) in the general population?

ECE2 p.Gly656Ser (c.1966G>A) is rare (popmax 0.346%, mid) (gnomAD).

What do computational predictors say about ECE2 p.Gly656Ser (c.1966G>A)?

AlphaMissense predicts likely pathogenic (score 0.7965) — an in-silico prediction, not a clinical call.

ECE2 p.Gly656Ser

c.1966G>A · rs138732933 · VCV2367549

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.7965 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.346%, mid)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.7965	likely pathogenic
REVEL	0.879	moderately pathogenic-leaning
SaProt	LLR -14.78	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.7, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 16 kb · p 0.014 · regional, not allelic
Overall
CADD	32.0	PHRED · no single calibrated threshold — expert panels disagree

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

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM G702S vs ClinVar G656S) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.346% Middle Eastern · 21/6,062 alleles

Filtering AF 0.232% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.195%

Overall 0.0557% 899/1,613,932 alleles · rare exomes 817/1,461,590 · genomes 82/152,342 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.346%	289
South Asian	0.0725%	1,379
European (non-Finnish)	0.0625%	1,599
Admixed American	0.0517%	1,933
Remaining individualsnot grpmax-eligible	0.0464%	2,155
Finnishnot grpmax-eligible	0.0125%	8,004
African / African-American	0.00666%	15,015
East Asian	0.00223%	44,876

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: ECE2
Protein: p.Gly656Ser
Coding: c.1966G>A
MANE Select: NM_001100121
dbSNP: rs138732933
Type: single nucleotide variant
Location: chr3:184291171 (GRCh38)
Gene constraint: LOEUF 0.965 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 87.75
Residue 702 UniProt numbering: the peptidase m13 domain

Full ECE2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ECE2 p.Arg453Gln Benign ★★ same type
ECE2 p.Ser400= Benign ★★ same type
ECE2 p.Val248= Benign ★★ same type
EEF1AKMT4-ECE2 p.Val127Ala Benign ★★ same type
ECE2 p.Ala338Val Uncertain significance ★ ⚠ same type
ECE2 p.Ala437Thr Uncertain significance ★ ⚠ same type
ECE2 p.Ala575Thr Uncertain significance ★ ⚠ same type
ECE2 p.Ala638Gly 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/ece2-p-gly656ser (accessed [today's date]).

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