NM_000834.5(GRIN2B):c.448A>G (p.Ile150Val) AND multiple conditions

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jul 30, 2021
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV001852459.5

Allele description [Variation Report for NM_000834.5(GRIN2B):c.448A>G (p.Ile150Val)]

NM_000834.5(GRIN2B):c.448A>G (p.Ile150Val)

Gene:

GRIN2B:glutamate ionotropic receptor NMDA type subunit 2B [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

12p13.1

Genomic location:

Preferred name:

NM_000834.5(GRIN2B):c.448A>G (p.Ile150Val)

HGVS:

NC_000012.12:g.13753879T>C
NG_031854.2:g.233134A>G
NM_000834.5:c.448A>GMANE SELECT
NP_000825.2:p.Ile150Val
NC_000012.11:g.13906813T>C
NM_000834.3:c.448A>G

Protein change:

I150V

Links:

dbSNP: rs796052570

NCBI 1000 Genomes Browser:

rs796052570

Molecular consequence:

NM_000834.5:c.448A>G - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Intellectual disability, autosomal dominant 6 (MRD6)
Synonyms:: INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL DOMINANT 6, WITH OR WITHOUT SEIZURES
Identifiers:: MONDO: MONDO:0013509; MedGen: C3151411; OMIM: 613970

Name:: Developmental and epileptic encephalopathy, 27 (DEE27)
Synonyms:: Epileptic encephalopathy, early infantile, 27
Identifiers:: MONDO: MONDO:0014505; MedGen: C4015316; Orphanet: 3451; OMIM: 616139

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002181914	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jul 30, 2021)	germline	clinical testing	PubMed (3) [See all records that cite these PMIDs] 26633542, 28377535, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV002181914

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jul 30, 2021)

germline

clinical testing

PubMed (3)
[See all records that cite these PMIDs]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Clinical application of whole-exome sequencing across clinical indications.

Retterer K, Juusola J, Cho MT, Vitazka P, Millan F, Gibellini F, Vertino-Bell A, Smaoui N, Neidich J, Monaghan KG, McKnight D, Bai R, Suchy S, Friedman B, Tahiliani J, Pineda-Alvarez D, Richard G, Brandt T, Haverfield E, Chung WK, Bale S.

Genet Med. 2016 Jul;18(7):696-704. doi: 10.1038/gim.2015.148. Epub 2015 Dec 3.

PubMed [citation]

PMID:: 26633542

GRIN2B encephalopathy: novel findings on phenotype, variant clustering, functional consequences and treatment aspects.

Platzer K, Yuan H, Schütz H, Winschel A, Chen W, Hu C, Kusumoto H, Heyne HO, Helbig KL, Tang S, Willing MC, Tinkle BT, Adams DJ, Depienne C, Keren B, Mignot C, Frengen E, Strømme P, Biskup S, Döcker D, Strom TM, Mefford HC, et al.

J Med Genet. 2017 Jul;54(7):460-470. doi: 10.1136/jmedgenet-2016-104509. Epub 2017 Apr 4.

PubMed [citation]

PMID:: 28377535
PMCID:: PMC5656050

See all PubMed Citations (3)

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV002181914.4

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (3)

Description

This missense change has been observed in individual(s) with clinical features of GRIN2B-related conditions (PMID: 26633542, 28377535). This variant is not present in population databases (ExAC no frequency). ClinVar contains an entry for this variant (Variation ID: 205709). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt GRIN2B protein function. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This sequence change replaces isoleucine with valine at codon 150 of the GRIN2B protein (p.Ile150Val). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and valine.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Mar 5, 2025

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