rs879253931

Positions:

• chr12-13567084-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000834.5(GRIN2B):​c.2539C>T​(p.Arg847Ter) variant causes a stop gained change. 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 Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GRIN2B NM_000834.5 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:11
• Conservation: PhyloP100: 5.82

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 24 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 12-13567084-G-A is Pathogenic according to our data. Variant chr12-13567084-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 245756.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-13567084-G-A is described in Lovd as [Pathogenic]. Variant chr12-13567084-G-A is described in Lovd as [Likely_pathogenic]. Variant chr12-13567084-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIN2B	NM_000834.5	c.2539C>T	p.Arg847Ter	stop_gained	13/14	ENST00000609686.4
GRIN2B	NM_001413992.1	c.2539C>T	p.Arg847Ter	stop_gained	14/15
GRIN2B	XM_005253351.3	c.325C>T	p.Arg109Ter	stop_gained	3/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIN2B	ENST00000609686.4	c.2539C>T	p.Arg847Ter	stop_gained	13/14	1	NM_000834.5	P1
GRIN2B	ENST00000637214.1	c.69+41519C>T		intron_variant		5
GRIN2B	ENST00000628166.2			downstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1461848 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727236

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:11

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:4

Likely pathogenic, criteria provided, single submitter	clinical testing	Clinical Genetics and Genomics, Karolinska University Hospital	Feb 12, 2015	- -
Pathogenic, no assertion criteria provided	clinical testing	Laboratory of Molecular Genetics (Pr. Bezieau's lab), CHU de Nantes	Jun 27, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 08, 2021	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 27572814, 28377535) -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2018	- -

Intellectual disability, autosomal dominant 6 Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Victorian Clinical Genetics Services, Murdoch Childrens Research Institute	Jul 17, 2023	Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with intellectual developmental disorder, autosomal dominant 6, with or without seizures (MIM#613970) and developmental and epileptic encephalopathy 27 (MIM#616139). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0201 - Variant is predicted to cause nonsense-mediated decay (NMD) and loss of protein (premature termination codon is located at least 54 nucleotides upstream of the final exon-exon junction). (SP) 0251 - This variant is heterozygous. (I) 0301 - Variant is absent from gnomAD (both v2 and v3). (SP) 0701 - Other NMD predicted variants comparable to the one identified in this case have very strong previous evidence for pathogenicity (DECIPHER). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported with de novo inheritance in multiple individuals with intellectual disability and developmental delay (ClinVar, DECIPHER, PMID: 27572814, 28377535). (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -
Pathogenic, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	-	Consanguinity: Absent Clinical symptoms: Developmental delay, not interested in surrounding, delay in fine motor, microcephaly, eyes not focusing, no hearing concerns, unable to stand, Mongolian spots, right side hyperpigmented macule, central hypotonia, hyper mobile joints, genu recurvatum and abnormal coordination. Biochemical Testing: CPK 172/168. Family History: Mother had 1 missed pregnancy. Clinical suspicion: Global developmental delay/Myopathy/Carbohydrate deficient glycoprotein. -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, University of Leipzig Medical Center	Apr 04, 2017	This variant was identified as de novo (maternity and paternity confirmed). -
Pathogenic, criteria provided, single submitter	clinical testing	Kasturba Medical College, Manipal, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India	-	- -

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

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 27, 2023

This sequence change creates a premature translational stop signal (p.Arg847*) in the GRIN2B gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in GRIN2B are known to be pathogenic (PMID: 28377535). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with early infantile epileptic encephalopathy and intellectual disability (PMID: 27572814, 28377535; Invitae). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 245756). For these reasons, this variant has been classified as Pathogenic. -

Complex neurodevelopmental disorder Pathogenic:1

Pathogenic, no assertion criteria provided

provider interpretation

GenomeConnect - Simons Searchlight

Sep 05, 2018

Submission from Simons Searchlight facilitated by GenomeConnect. Variant interpreted by the Simons Searchlight team most recently on 2018-09-05 and interpreted as Pathogenic. The reporting laboratory might also submit to ClinVar. This variant was identified in multiple probands enrolled in Simons Searchlight. -

Developmental and epileptic encephalopathy, 27 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Molecular Genetics Lab, CHRU Brest

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	43
DANN	Uncertain	1.0
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Uncertain	0.96	D
MutationTaster	Benign	1.0	A
Vest4		0.92
GERP RS		3.9

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: rs879253931; hg19: chr12-13720018; COSMIC: COSV74206073; COSMIC: COSV74206073;