rs797044849

Positions:

• chr12-13567164-C-A
• chr12-13567164-C-G
• chr12-13567164-C-T

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_000834.5(GRIN2B):​c.2459G>T​(p.Gly820Val) 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 Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G820A) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GRIN2B NM_000834.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• 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]

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PM1: In a transmembrane_region Helical (size 19) in uniprot entity NMDE2_HUMAN there are 17 pathogenic changes around while only 0 benign (100%) in NM_000834.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-13567164-C-G is described in Lovd as [Pathogenic].
• 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, 0.984
• PP5: Variant 12-13567164-C-A is Pathogenic according to our data. Variant chr12-13567164-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 234635.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-13567164-C-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GRIN2B	NM_000834.5	c.2459G>T	p.Gly820Val	missense_variant	13/14	ENST00000609686.4	NP_000825.2
GRIN2B	NM_001413992.1	c.2459G>T	p.Gly820Val	missense_variant	14/15		NP_001400921.1
GRIN2B	XM_005253351.3	c.245G>T	p.Gly82Val	missense_variant	3/4		XP_005253408.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GRIN2B	ENST00000609686.4	c.2459G>T	p.Gly820Val	missense_variant	13/14	1	NM_000834.5	ENSP00000477455	P1
GRIN2B	ENST00000637214.1	c.69+41439G>T		intron_variant		5		ENSP00000489997
GRIN2B	ENST00000628166.2	n.719G>T		non_coding_transcript_exon_variant	5/5	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

GRIN2B-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 30, 2023

The GRIN2B c.2459G>T variant is predicted to result in the amino acid substitution p.Gly820Val. This missense change was documented de novo in at least two unrelated individuals with developmental delays and intellectual disability (Platzer et al. 2017. PubMed ID: 28377535, Ziats et al. 2020. PubMed ID: 31618753). Additionally, multiple patients with de novo variants leading to different amino acid substitutions at this residue have been reported with features consistent with GRIN2B-related disease (p.Gly820Arg, p.Gly820Ala, p.Gly820Glu; Platzer et al. 2017. PubMed ID: 28377535, Powis et al. 2020. PubMed ID: 31628766, Gao et al. 2018. PubMed ID: 30440138, Marinakis et al. 2021. PubMed ID: 34008892). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. This variant is interpreted as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 24, 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; This variant is associated with the following publications: (PMID: 27839871, 28377535, 27818011, 28636915, 31618753, 34568804) -

Intellectual disability, autosomal dominant 6 Pathogenic:1

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). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.45
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.92	D
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Uncertain	-0.14	T
MutationAssessor	Pathogenic	3.5	M
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.92	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.98
MutPred		0.85		Loss of helix (P = 0.0558);
MVP		0.97
MPC		2.6
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.85
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: rs797044849; hg19: chr12-13720098;