Is ETHE1 p.Pro22= (c.66C>T) pathogenic?

ETHE1 p.Pro22= (c.66C>T) is classified Likely benign in ETHE1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-02-23). No allele count reported in gnomAD v4.1 (AN 1,557,558); Associated with ethylmalonic encephalopathy.

What condition is associated with ETHE1 p.Pro22= (c.66C>T)?

ETHE1 p.Pro22= (c.66C>T) is associated with ethylmalonic encephalopathy (ClinVar).

How common is ETHE1 p.Pro22= (c.66C>T) in the general population?

ETHE1 p.Pro22= (c.66C>T) is no allele count reported in gnomAD v4.1 (AN 1,557,558) (gnomAD).

How is Ethylmalonic encephalopathy inherited?

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

ETHE1 p.Pro22=

c.66C>T · VCV3683450

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,557,558)

Conditions

ethylmalonic encephalopathy

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 -0.35	GERP 0.081
Overall
CADD	7.498	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,557,558). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: ETHE1
Protein: p.Pro22=
Coding: c.66C>T
MANE Select: NM_014297
Type: single nucleotide variant
Location: chr19:43527112 (GRCh38)
Gene constraint: LOEUF 0.97 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.05 · 1 PDB
Residue 22: an α-helix

Full ETHE1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ethylmalonic encephalopathy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Ethylmalonic encephalopathy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ETHE1 c.505+1G>A Pathogenic ★★★ same condition
ETHE1 c.505+1G>T Pathogenic ★★★ same condition
ETHE1 p.Arg163Gln Pathogenic ★★★ same condition
ETHE1 p.Arg163Trp Pathogenic ★★★ same condition
ETHE1 p.Ala254Val Uncertain significance ★★★ ⚠ same condition
ETHE1 p.Arg124Leu Uncertain significance ★★★ ⚠ same condition
ETHE1 p.Lys66Arg Uncertain significance ★★★ ⚠ same condition
ETHE1 p.Val143Ile 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/ethe1-p-pro22 (accessed [today's date]).

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