rs748950853

Positions:

• chr6-102035558-C-G
• chr6-102035558-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_021956.5(GRIK2):​c.2303C>G​(p.Thr768Ser) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: GRIK2 NM_021956.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.91

Genes affected

GRIK2 (HGNC:4580): (glutamate ionotropic receptor kainate type subunit 2) Glutamate receptors are the predominant excitatory neurotransmitter receptors in the mammalian brain and are activated in a variety of normal neurophysiologic processes. This gene product belongs to the kainate family of glutamate receptors, which are composed of four subunits and function as ligand-activated ion channels. The subunit encoded by this gene is subject to RNA editing at multiple sites within the first and second transmembrane domains, which is thought to alter the structure and function of the receptor complex. Alternatively spliced transcript variants encoding different isoforms have also been described for this gene. Mutations in this gene have been associated with autosomal recessive cognitive disability. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a topological_domain Extracellular (size 162) in uniprot entity GRIK2_HUMAN there are 8 pathogenic changes around while only 1 benign (89%) in NM_021956.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.753

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIK2	NM_021956.5	c.2303C>G	p.Thr768Ser	missense_variant	15/17	ENST00000369134.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIK2	ENST00000369134.9	c.2303C>G	p.Thr768Ser	missense_variant	15/17	5	NM_021956.5	P4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 25

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Nov 12, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.88
BayesDel_addAF	Uncertain	0.035	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.64	D;.;.;D;.;T
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D;D;D;D
M_CAP	Benign	0.027	D
MetaRNN	Pathogenic	0.75	D;D;D;D;D;D
MetaSVM	Benign	-1.0	T
MutationAssessor	Pathogenic	3.0	M;M;M;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-3.4	D;D;D;N;N;.
REVEL	Uncertain	0.45
Sift	Uncertain	0.0010	D;D;D;T;T;.
Sift4G	Uncertain	0.017	D;D;D;D;D;D
Polyphen		1.0	D;D;D;.;.;.
Vest4		0.74
MutPred		0.78		Gain of glycosylation at T768 (P = 0.0424);Gain of glycosylation at T768 (P = 0.0424);Gain of glycosylation at T768 (P = 0.0424);.;.;.;
MVP		0.65
MPC		2.1
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.94
gMVP		0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs748950853; hg19: chr6-102483433;