12-13608792-C-G

Position:

• chr12-13608792-C-G

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PS1 PM1 PM2 PM5 PP2 PP3_Strong PP5

The NM_000834.5(GRIN2B):​c.1821G>C​(p.Trp607Cys) 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 (no stars). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin Lovd. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. W607S) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GRIN2B NM_000834.5 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• 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 16 ACMG points.

• PS1: Transcript NM_000834.5 (GRIN2B) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd
• PM1: In a region_of_interest Pore-forming (size 19) in uniprot entity NMDE2_HUMAN there are 7 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 chr12-13608793-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, 0.989
• PP5: Variant 12-13608792-C-G is Pathogenic according to our data. Variant chr12-13608792-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 374327.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GRIN2B	NM_000834.5	c.1821G>C	p.Trp607Cys	missense_variant	10/14	ENST00000609686.4	NP_000825.2
LOC105369668	XR_001749013.2	n.342+35C>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GRIN2B	ENST00000609686.4	c.1821G>C	p.Trp607Cys	missense_variant	10/14	1	NM_000834.5	ENSP00000477455	P1
	ENST00000652867.1	n.203-6306C>G		intron_variant, non_coding_transcript_variant
GRIN2B	ENST00000628166.2	n.81G>C		non_coding_transcript_exon_variant	2/5	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Intellectual disability, autosomal dominant 6 Pathogenic:1

Likely pathogenic, no assertion criteria provided

clinical testing

Baylor Genetics

Mar 13, 2015

Our laboratory reported dual molecular diagnoses in GRIN2B (NM_000834.3, c.1821G>C) and SHOX (NM_000451.3, c.544+1G>A) in a single individual who has features which include delayed motor milestones, delayed speech, intellectual disability, hypotonia, short stature, reflexes at knees and ankles, failure to thrive, seborrheic dermatitis, and unilateral testicle atrophy. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	32
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.96	D
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.71	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Uncertain	0.22	D
MutationAssessor	Pathogenic	3.7	H
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.94	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.99
MutPred		0.89		Gain of methylation at K604 (P = 0.1102);
MVP		0.94
MPC		2.9
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.87
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1057518700; hg19: chr12-13761726;