Is GRIN2A p.Pro57= (c.171C>T) pathogenic?

GRIN2A p.Pro57= (c.171C>T) is classified Conflicting classifications of pathogenicity in GRIN2A (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2025-07-30). Very rare (popmax 0.000932%, nfe); Associated with Landau-Kleffner syndrome.

What condition is associated with GRIN2A p.Pro57= (c.171C>T)?

GRIN2A p.Pro57= (c.171C>T) is associated with Landau-Kleffner syndrome (ClinVar).

How common is GRIN2A p.Pro57= (c.171C>T) in the general population?

GRIN2A p.Pro57= (c.171C>T) is very rare (popmax 0.000932%, nfe) (gnomAD).

How is Landau-Kleffner syndrome inherited?

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

GRIN2A p.Pro57=

c.171C>T · rs781693549 · VCV211114

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000932%, nfe)

Conditions

Landau-Kleffner syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -5.5	GERP -3
Overall
CADD	4.966	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000932% European (non-Finnish) · 11/1,180,022 alleles

Filtering AF 0.0005% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000366%

Overall 0.000806% 13/1,613,878 alleles · very rare exomes 12/1,461,684 · genomes 1/152,194 · joint denominator

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0032%	31,243
European (non-Finnish)grpmax	0.000932%	107,275

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: GRIN2A
Protein: p.Pro57=
Coding: c.171C>T
MANE Select: NM_001134407
dbSNP: rs781693549
Type: single nucleotide variant
Location: chr16:10180241 (GRCh38)
Gene constraint: LOEUF 0.268 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 60.70 · 37 PDB
Residue 57: a UniProt-annotated variant site (found in a cutaneous malignant melanoma sample; somatic mutation)

Full GRIN2A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Landau-Kleffner syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Landau-Kleffner syndrome (Orphanet):

Inheritance: Autosomal dominant, Unknown
Onset: Childhood
Prevalence: 1-9 / 1 000 000 (Japan)

Similar variants

GRIN2A p.Pro57Ser Uncertain significance ★ ⚠ same residue
GRIN2A c.1007+1G>A Pathogenic/Likely pathogenic ★★ same condition
GRIN2A c.1007+1G>T Pathogenic ★★ same condition
GRIN2A c.1123-2A>G Pathogenic/Likely pathogenic ★★ same condition
GRIN2A c.1497+1G>T Pathogenic/Likely pathogenic ★★ same condition
GRIN2A c.2007+1G>T Likely pathogenic ★★ same condition
GRIN2A c.2168+1G>C Pathogenic/Likely pathogenic ★★ same condition
GRIN2A c.415-2A>G 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/grin2a-p-pro57 (accessed [today's date]).

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