rs672601378

Positions:

• chr12-13615149-C-T

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2 PP2 PP3_Moderate PP5_Very_Strong

The NM_000834.5(GRIN2B):​c.1619G>A​(p.Arg540His) 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. 11/18 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GRIN2B NM_000834.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 7.90

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]

(HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• 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, 0.927
• PP5: Variant 12-13615149-C-T is Pathogenic according to our data. Variant chr12-13615149-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 162087.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-13615149-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GRIN2B	NM_000834.5	c.1619G>A	p.Arg540His	missense_variant	8/14	ENST00000609686.4	NP_000825.2
LOC105369668	XR_001749013.2	n.536C>T		non_coding_transcript_exon_variant	4/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GRIN2B	ENST00000609686.4	c.1619G>A	p.Arg540His	missense_variant	8/14	1	NM_000834.5	ENSP00000477455	P1
	ENST00000652867.1	n.254C>T		non_coding_transcript_exon_variant	2/3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1460874 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726830

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.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Intellectual disability, autosomal dominant 6 Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 01, 2014	- -
Likely 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). -

Inborn genetic diseases Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 23, 2020

The c.1619G>A (p.R540H) alteration is located in exon 7 (coding exon 6) of the GRIN2B gene. This alteration results from a G to A substitution at nucleotide position 1619, causing the arginine (R) at amino acid position 540 to be replaced by a histidine (H). Based on data from the Genome Aggregation Database (gnomAD), the GRIN2B c.1619G>A alteration was not observed, with coverage at this position. This variant was reported as de novo in multiple individuals with intellectual disability and seizures (Lemke, 2014; Platzer, 2017). This missense alteration is located in a region that has a low rate of benign missense variation (Lek, 2016; Firth, 2009). The p.R540H alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, this alteration is classified as likely pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 15, 2023

Published functional studies demonstrate a damaging effect (Swanger et al., 2016; Lemke et al., 2014); 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; This variant is associated with the following publications: (PMID: 33796003, 28533163, 24272827, 33004838, 28377535, 27839871, 35741674) -

Intellectual disability Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Diagnostic Laboratory, Strasbourg University Hospital

Sep 10, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Pathogenic	0.98
Eigen_PC	Pathogenic	0.96
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Benign	-0.60	T
MutationAssessor	Pathogenic	3.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.90	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.88
MutPred		0.60		Loss of methylation at R540 (P = 0.1104);
MVP		0.96
MPC		2.3
ClinPred		0.98	D
GERP RS		6.2
Varity_R		0.63
gMVP		0.95

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: rs672601378; hg19: chr12-13768083; COSMIC: COSV74204705;