12-13562832-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_000834.5(GRIN2B):c.4406G>A(p.Ser1469Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,848 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: GRIN2B NM_000834.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.77

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, GRIN2B

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIN2B	NM_000834.5	c.4406G>A	p.Ser1469Asn	missense_variant	14/14	ENST00000609686.4
GRIN2B	NM_001413992.1	c.4406G>A	p.Ser1469Asn	missense_variant	15/15
GRIN2B	XM_005253351.3	c.2192G>A	p.Ser731Asn	missense_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIN2B	ENST00000609686.4	c.4406G>A	p.Ser1469Asn	missense_variant	14/14	1	NM_000834.5	P1
GRIN2B	ENST00000637214.1	c.69+45771G>A		intron_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251490 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135918

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461848 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727234

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, autosomal dominant 6;C4015316:Developmental and epileptic encephalopathy, 27 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

New York Genome Center

Jun 25, 2021

The inherited c.4406G>A, p.Ser1469Asn variant identified in the GRIN2B gene has not been reported in the literature in individuals with GRIN2B-related neurodevelopmental disorders. This variant is absent in gnomAD v3.1.1, suggesting it is not a common benign variant in the populations represented in this database. In silico algorithms predict a conflicting interpretation of pathogenicity. The variant resides at N-methyl D-aspartate receptor 2B3 C-terminus domainof the GluN2B protein. This domain is found at the C-terminus of many NMDA-receptor proteins (PMID:8428958). Given the lack of compelling evidence for its pathogenicity, the inherited c.4406G>A, p.Ser1469Asn variant identified in the GRIN2B gene is reported as a Variant of UncertainSignificance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.41
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.46	T
Eigen	Benign	0.14
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.85	D
M_CAP	Benign	0.0041	T
MetaRNN	Uncertain	0.44	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.5	L
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.75	T
Sift4G	Benign	0.19	T
Polyphen		0.18	B
Vest4		0.54
MutPred		0.65		Gain of relative solvent accessibility (P = 0.0023);
MVP		0.59
MPC		0.93
ClinPred		0.49	T
GERP RS		4.8
Varity_R		0.38
gMVP		0.68

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

Publications

LitVar

Other links and lift over

dbSNP: rs202133231; hg19: chr12-13715766;