Is GLUL p.Asp122= (c.366C>T) pathogenic?

GLUL p.Asp122= (c.366C>T) is classified Likely benign in GLUL (ClinVar, Single submitter, 1 submitter; last evaluated 2023-11-24). Very rare (popmax 0.00289%, nfe); Associated with congenital brain dysgenesis due to glutamine synthetase deficiency.

What condition is associated with GLUL p.Asp122= (c.366C>T)?

GLUL p.Asp122= (c.366C>T) is associated with congenital brain dysgenesis due to glutamine synthetase deficiency (ClinVar).

How common is GLUL p.Asp122= (c.366C>T) in the general population?

GLUL p.Asp122= (c.366C>T) is very rare (popmax 0.00289%, nfe) (gnomAD).

GLUL p.Asp122=

Q: How is Congenital brain dysgenesis due to glutamine synthetase deficiency inherited?

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

c.366C>T · rs375568739 · VCV724171

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00289%, nfe)

Conditions

congenital brain dysgenesis due to glutamine synthetase 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 1.5	GERP -0.067, phastCons 1
Overall
CADD	10.68	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00289% European (non-Finnish) · 34/1,178,040 alleles

Filtering AF 0.00208% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00183%

Overall 0.0023% 37/1,611,856 alleles · very rare exomes 34/1,459,672 · genomes 3/152,184 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00289%	34,648
African / African-American	0.00267%	37,438
Admixed American	0.00167%	60,010

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: GLUL
Protein: p.Asp122=
Coding: c.366C>T
MANE Select: NM_001033044
dbSNP: rs375568739
Type: single nucleotide variant
Location: chr1:182386365 (GRCh38)
Gene constraint: LOEUF 0.377 · pLI 1.00 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 97.58 · 12 PDB
Residue 122: the gs catalytic domain; an α-helix

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

Disease context

congenital brain dysgenesis due to glutamine synthetase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Congenital brain dysgenesis due to glutamine synthetase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

GLUL p.Asp122Gly Uncertain significance ★ ⚠ same residue
GLUL c.*129G>T Uncertain significance ★★ same condition
GLUL c.*272C>G Uncertain significance ★★ same condition
GLUL c.*849C>T Uncertain significance ★★ same condition
GLUL p.Arg181Gln Uncertain significance ★★ ⚠ same condition
GLUL p.Arg286His Uncertain significance ★★ ⚠ same condition
GLUL p.Arg357Cys Uncertain significance ★★ ⚠ same condition
GLUL p.Arg90Cys 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/glul-p-asp122 (accessed [today's date]).

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