Is ECHS1 p.Asp202fs (c.605_611del) pathogenic?

ECHS1 p.Asp202fs (c.605611del) is classified Likely pathogenic in ECHS1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-05-02). Very rare (popmax 8.48e-05%, nfe); Associated with mitochondrial short-chain Enoyl-Coa hydratase 1 deficiency.

What condition is associated with ECHS1 p.Asp202fs (c.605_611del)?

ECHS1 p.Asp202fs (c.605_611del) is associated with mitochondrial short-chain Enoyl-Coa hydratase 1 deficiency (ClinVar).

How common is ECHS1 p.Asp202fs (c.605_611del) in the general population?

ECHS1 p.Asp202fs (c.605_611del) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

ECHS1 p.Asp202fs

Q: How is Mitochondrial short-chain enoyl-CoA hydratase 1 deficiency inherited?

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

c.605_611del · VCV3779304

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

Conditions

mitochondrial short-chain Enoyl-Coa hydratase 1 deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 5 of 8
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 1.3	phastCons 1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,696 alleles

Overall 6.85e-05% 1/1,458,882 alleles · very rare

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: ECHS1
Protein: p.Asp202fs
Coding: c.605_611del
MANE Select: NM_004092
Type: Deletion
Location: chr10:133366897 (GRCh38)
Gene constraint: LOEUF 0.907 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 91.54 · 6 PDB
Residue 202: an α-helix

Full ECHS1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

mitochondrial short-chain Enoyl-Coa hydratase 1 deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Mitochondrial short-chain enoyl-CoA hydratase 1 deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy, Neonatal

Similar variants

ECHS1 p.Asp202= Likely benign ★★ same residue
ECHS1 p.Tyr137fs Conflicting classifications of pathogenicity ★ same condition
ECHS1 c.414+1G>A Pathogenic/Likely pathogenic ★★ same condition
ECHS1 c.88+5G>A Pathogenic/Likely pathogenic ★★ same condition
ECHS1 p.Ala132Thr Pathogenic/Likely pathogenic ★★ same condition
ECHS1 p.Ala173Val Pathogenic/Likely pathogenic ★★ ⚠ same condition
ECHS1 p.Ala238Val Pathogenic/Likely pathogenic ★★ ⚠ same condition
ECHS1 p.Ala278Thr Likely pathogenic ★★ 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/echs1-p-asp202fs (accessed [today's date]).

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