Is GLDC p.Phe63= (c.189C>T) pathogenic?

GLDC p.Phe63= (c.189C>T) is classified Likely benign in GLDC (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-14). Very rare (popmax 0.00113%, sas); Associated with glycine encephalopathy.

What condition is associated with GLDC p.Phe63= (c.189C>T)?

GLDC p.Phe63= (c.189C>T) is associated with glycine encephalopathy (ClinVar).

How common is GLDC p.Phe63= (c.189C>T) in the general population?

GLDC p.Phe63= (c.189C>T) is very rare (popmax 0.00113%, sas) (gnomAD).

How is Glycine encephalopathy inherited?

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

GLDC p.Phe63=

c.189C>T · rs1376845853 · VCV2779589

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00113%, sas)

Conditions

glycine 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 1.3	GERP -0.5, phastCons 1
Overall
CADD	12.02	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00113% South Asian · 1/88,222 alleles

Overall 0.000139% 2/1,442,744 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00113%	88,222
European (non-Finnish)	8.53e-05%	1,172,338

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: GLDC
Protein: p.Phe63=
Coding: c.189C>T
MANE Select: NM_000170
dbSNP: rs1376845853
Type: single nucleotide variant
Location: chr9:6645311 (GRCh38)
Gene constraint: LOEUF 1.09 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.50 · 3 PDB

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

Disease context

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

For Glycine encephalopathy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

GLDC p.Phe63Ile Uncertain significance ★ ⚠ same residue
GLDC c.1401+1G>A Pathogenic/Likely pathogenic ★★ same condition
GLDC c.1580+2T>G Pathogenic ★★ same condition
GLDC c.1851-1G>A Pathogenic ★★ same condition
GLDC c.2053-2A>G Likely pathogenic ★★ same condition
GLDC c.2203-2A>G Pathogenic/Likely pathogenic ★★ same condition
GLDC c.2315+2T>A Pathogenic/Likely pathogenic ★★ same condition
GLDC c.2315+2T>G Pathogenic/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/gldc-p-phe63 (accessed [today's date]).

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