NM_000834.5:c.975C>A

Variant names:

• chr12-13753352-G-T
• rs200380868
• NM_000834.5:c.975C>A

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_Strong BS2

The NM_000834.5(GRIN2B):​c.975C>A​(p.His325Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000549 in 1,456,808 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H325Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: GRIN2B NM_000834.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.709
• Publications: 0 publications found

Genes affected

GRIN2B (HGNC:4586): (glutamate ionotropic receptor NMDA type subunit 2B) This gene encodes a member of the N-methyl-D-aspartate (NMDA) receptor family within the ionotropic glutamate receptor superfamily. The encoded protein is a subunit of the NMDA receptor ion channel which acts as an agonist binding site for glutamate. The NMDA receptors mediate a slow calcium-permeable component of excitatory synaptic transmission in the central nervous system. The NMDA receptors are heterotetramers of seven genetically encoded, differentially expressed subunits including NR1 (GRIN1), NR2 (GRIN2A, GRIN2B, GRIN2C, or GRIN2D) and NR3 (GRIN3A or GRIN3B). The early expression of this gene in development suggests a role in brain development, circuit formation, synaptic plasticity, and cellular migration and differentiation. Naturally occurring mutations within this gene are associated with neurodevelopmental disorders including autism spectrum disorder, attention deficit hyperactivity disorder, epilepsy, and schizophrenia. [provided by RefSeq, Aug 2017]

GRIN2B Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
• developmental and epileptic encephalopathy, 27

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• intellectual disability, autosomal dominant 6

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• autosomal dominant non-syndromic intellectual disability

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.04008484).
• BS2: High AC in GnomAdExome4 at 8 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000834.5. 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
	GRIN2B	NM_000834.5	MANE Select	c.975C>A	p.His325Gln	missense	Exon 4 of 14	NP_000825.2
	GRIN2B	NM_001413992.1		c.975C>A	p.His325Gln	missense	Exon 5 of 15	NP_001400921.1
	GRIN2B	NM_001413993.1		c.975C>A	p.His325Gln	missense	Exon 4 of 4	NP_001400922.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIN2B	ENST00000609686.4	TSL:1 MANE Select	c.975C>A	p.His325Gln	missense	Exon 4 of 14	ENSP00000477455.1
	GRIN2B	ENST00000630791.3	TSL:5	c.975C>A	p.His325Gln	missense	Exon 5 of 15	ENSP00000486677.3
	GRIN2B	ENST00000714048.1		n.975C>A		non_coding_transcript_exon	Exon 4 of 13	ENSP00000519339.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000549 AC: 8 AN: 1456808 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 725148

African (AFR) AF: 0.00 AC: 0 AN: 33364

American (AMR) AF: 0.00 AC: 0 AN: 44710

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26110

East Asian (EAS) AF: 0.00 AC: 0 AN: 39680

South Asian (SAS) AF: 0.00 AC: 0 AN: 86138

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5750

European-Non Finnish (NFE) AF: 0.00000632 AC: 7 AN: 1107422

Other (OTH) AF: 0.0000166 AC: 1 AN: 60216

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Aug 19, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.975C>A (p.H325Q) alteration is located in exon 3 (coding exon 2) of the GRIN2B gene. This alteration results from a C to A substitution at nucleotide position 975, causing the histidine (H) at amino acid position 325 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.053
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	0.50
DANN	Benign	0.78
DEOGEN2	Benign	0.24	T
Eigen	Benign	-1.7
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.044	N
LIST_S2	Benign	0.50	T
M_CAP	Benign	0.0058	T
MetaRNN	Benign	0.040	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	-1.4	N
PhyloP100		-0.71
PrimateAI	Uncertain	0.65	T
Sift4G	Benign	0.67	T
Polyphen		0.0	B
Vest4		0.12
MutPred		0.40		Gain of disorder (P = 0.1303)
MVP		0.33
MPC		1.2
ClinPred		0.18	T
GERP RS		-8.7
Varity_R		0.38
gMVP		0.33
Mutation Taster		=78/22	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: rs200380868; hg19: chr12-13906286;