9-137139640-C-G

Variant names:

• chr9-137139640-C-G
• rs950054021
• NM_007327.4:c.154C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4 BP6

The NM_007327.4(GRIN1):​c.154C>G​(p.Arg52Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,466 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R52Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: GRIN1 NM_007327.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 0.917
• Publications: 0 publications found

Genes affected

GRIN1 (HGNC:4584): (glutamate ionotropic receptor NMDA type subunit 1) The protein encoded by this gene is a critical subunit of N-methyl-D-aspartate receptors, members of the glutamate receptor channel superfamily which are heteromeric protein complexes with multiple subunits arranged to form a ligand-gated ion channel. These subunits play a key role in the plasticity of synapses, which is believed to underlie memory and learning. Cell-specific factors are thought to control expression of different isoforms, possibly contributing to the functional diversity of the subunits. Alternatively spliced transcript variants have been described. [provided by RefSeq, Jul 2008]

GRIN1 Gene-Disease associations (from GenCC):

• neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal dominant

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• complex neurodevelopmental disorder

  Inheritance: AR, AD Classification: DEFINITIVE Submitted by: ClinGen
• neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal recessive

  Inheritance: AR Classification: DEFINITIVE, MODERATE Submitted by: G2P, Ambry Genetics
• developmental and epileptic encephalopathy 101

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.36100566).
• BP6: Variant 9-137139640-C-G is Benign according to our data. Variant chr9-137139640-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 539838.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007327.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIN1	NM_007327.4	MANE Select	c.154C>G	p.Arg52Gly	missense	Exon 1 of 20	NP_015566.1
	GRIN1	NM_001437330.1		c.154C>G	p.Arg52Gly	missense	Exon 1 of 21	NP_001424259.1
	GRIN1	NM_001185090.2		c.154C>G	p.Arg52Gly	missense	Exon 1 of 21	NP_001172019.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIN1	ENST00000371561.8	TSL:1 MANE Select	c.154C>G	p.Arg52Gly	missense	Exon 1 of 20	ENSP00000360616.3
	GRIN1	ENST00000371553.8	TSL:1	c.154C>G	p.Arg52Gly	missense	Exon 1 of 21	ENSP00000360608.3
	GRIN1	ENST00000371560.5	TSL:1	c.154C>G	p.Arg52Gly	missense	Exon 1 of 20	ENSP00000360615.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000800 AC: 2 AN: 250114 AF XY: 0.00000739

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461466 Hom.: 0 Cov.: 32 AF XY: 0.00000688 AC XY: 5 AN XY: 727040

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.0000671 AC: 3 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53168

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000540 AC: 6 AN: 1111846

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Mar 25, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.154C>G (p.R52G) alteration is located in exon 1 (coding exon 1) of the GRIN1 gene. This alteration results from a C to G substitution at nucleotide position 154, causing the arginine (R) at amino acid position 52 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Neurodevelopmental disorder with or without hyperkinetic movements and seizures, autosomal dominant Benign:1

Jun 12, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.22
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.41	T
Eigen	Benign	-0.29
Eigen_PC	Benign	-0.23
FATHMM_MKL	Benign	0.12	N
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.45	D
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-0.36	T
MutationAssessor	Benign	0.34	N
PhyloP100		0.92
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.26
Sift	Benign	0.070	T
Sift4G	Benign	0.37	T
Polyphen		0.47	P
Vest4		0.38
MutPred		0.36		Loss of stability (P = 0.0211)
MVP		0.87
MPC		2.3
ClinPred		0.34	T
GERP RS		2.2
PromoterAI		-0.026	Neutral
Varity_R		0.34
gMVP		0.82
Mutation Taster		=79/21	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs950054021; hg19: chr9-140034092;