Is GCDH p.Ile97= (c.291T>C) pathogenic?

GCDH p.Ile97= (c.291T>C) is classified Likely benign in GCDH (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-07). Ultra-rare (popmax 0.0165%, mid); Associated with glutaryl-CoA dehydrogenase deficiency.

What condition is associated with GCDH p.Ile97= (c.291T>C)?

GCDH p.Ile97= (c.291T>C) is associated with glutaryl-CoA dehydrogenase deficiency (ClinVar).

How common is GCDH p.Ile97= (c.291T>C) in the general population?

GCDH p.Ile97= (c.291T>C) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

How is Glutaryl-CoA dehydrogenase deficiency inherited?

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

GCDH p.Ile97=

c.291T>C · rs766788256 · VCV1666987

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

glutaryl-CoA dehydrogenase deficiency

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 0.19	GERP 0.44, phastCons 0.012
Overall
CADD	11.82	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,062 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000372% 6/1,614,162 alleles · ultra-rare exomes 6/1,461,884 · genomes 0/152,278 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,062
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,606
Remaining individualsnot grpmax-eligible	0.0032%	31,254
European (non-Finnish)	0.000169%	590,012

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: GCDH
Protein: p.Ile97=
Coding: c.291T>C
MANE Select: NM_000159
dbSNP: rs766788256
Type: single nucleotide variant
Location: chr19:12892135 (GRCh38)
Gene constraint: LOEUF 0.752 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.23 · 4 PDB
Residue 97: an α-helix

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

Disease context

glutaryl-CoA dehydrogenase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Glutaryl-CoA dehydrogenase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: >1 / 1000 (Specific population)

Similar variants

GCDH c.1082+2T>C Pathogenic/Likely pathogenic ★★ same condition
GCDH c.1243+1G>T Pathogenic ★★ same condition
GCDH c.1244-2A>C Pathogenic ★★ same condition
GCDH c.127+1G>A Pathogenic ★★ same condition
GCDH c.127+1G>T Pathogenic/Likely pathogenic ★★ same condition
GCDH c.271+1G>A Pathogenic ★★ same condition
GCDH c.334+1G>A Likely pathogenic ★★ same condition
GCDH c.505+1G>A 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/gcdh-p-ile97 (accessed [today's date]).

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