rs879253945

Positions:

• chr12-13608667-T-C
• chr12-13608667-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3_Moderate PP5

The NM_000834.5(GRIN2B):​c.1946A>G​(p.Asn649Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GRIN2B NM_000834.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2
• Conservation: PhyloP100: 8.01

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a topological_domain Extracellular (size 170) in uniprot entity NMDE2_HUMAN there are 37 pathogenic changes around while only 0 benign (100%) in NM_000834.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), GRIN2B. . Gene score misZ 5.4168 (greater than the threshold 3.09). Trascript score misZ 7.3273 (greater than threshold 3.09). GenCC has associacion of gene with autism susceptibility 1, developmental and epileptic encephalopathy, 27, autosomal dominant non-syndromic intellectual disability, complex neurodevelopmental disorder, West syndrome, intellectual disability, autosomal dominant 6.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.908
• PP5: Variant 12-13608667-T-C is Pathogenic according to our data. Variant chr12-13608667-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 435389.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GRIN2B	NM_000834.5	c.1946A>G	p.Asn649Ser	missense_variant	10/14	ENST00000609686.4	NP_000825.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GRIN2B	ENST00000609686.4	c.1946A>G	p.Asn649Ser	missense_variant	10/14	1	NM_000834.5	ENSP00000477455.1
GRIN2B	ENST00000637214.1	c.5A>G	p.Asn2Ser	missense_variant	1/2	5		ENSP00000489997.1
GRIN2B	ENST00000628166.2	n.206A>G		non_coding_transcript_exon_variant	2/5	5
ENSG00000287928	ENST00000652867.1	n.203-6431T>C		intron_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Dec 06, 2022

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jan 11, 2016

- -

Developmental and epileptic encephalopathy, 27 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

3billion

Jan 03, 2022

The is not observed in the gnomAD v2.1.1 dataset (PM2_M). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.623, 3CNET: 0.996, PP3_P). A missense variant is a common mechanism associated with Developmental and epileptic encephalopathy 27 (PP2_P). Therefore, this variant is classified as uncertain significance according to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.061	T
BayesDel_noAF	Benign	-0.15
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	.;D
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Pathogenic	0.75	D
MetaRNN	Pathogenic	0.91	D;D
MetaSVM	Uncertain	0.14	D
MutationAssessor	Pathogenic	3.0	.;M
PrimateAI	Pathogenic	0.80	T
Sift4G	Uncertain	0.0040	.;D
Polyphen		1.0	.;D
Vest4		0.87
MutPred		0.74		.;Loss of sheet (P = 0.0228);
MVP		0.96
MPC		1.0
ClinPred		0.99	D
GERP RS		5.6
Varity_R		0.49
gMVP		0.99

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: rs879253945; hg19: chr12-13761601;