rs137852350

Positions:

• chrX-123482856-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_000828.5(GRIA3):​c.2497G>A​(p.Gly833Arg) 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. 10/17 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: GRIA3 NM_000828.5 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 10.0

Genes affected

GRIA3 (HGNC:4573): (glutamate ionotropic receptor AMPA type subunit 3) Glutamate receptors are the predominant excitatory neurotransmitter receptors in the mammalian brain and are activated in a variety of normal neurophysiologic processes. These receptors are heteromeric protein complexes composed of multiple subunits, arranged to form ligand-gated ion channels. The classification of glutamate receptors is based on their activation by different pharmacologic agonists. The subunit encoded by this gene belongs to a family of AMPA (alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate)-sensitive glutamate receptors, and is subject to RNA editing (AGA->GGA; R->G). Alternative splicing at this locus results in different isoforms, which may vary in their signal transduction properties. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant X-123482856-G-A is Pathogenic according to our data. Variant chrX-123482856-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 10356.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-123482856-G-A is described in Lovd as [Pathogenic]. Variant chrX-123482856-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GRIA3	NM_000828.5	c.2497G>A	p.Gly833Arg	missense_variant	15/16	ENST00000622768.5	NP_000819.4
GRIA3	NM_007325.5	c.2497G>A	p.Gly833Arg	missense_variant	15/16	ENST00000620443.2	NP_015564.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GRIA3	ENST00000620443.2	c.2497G>A	p.Gly833Arg	missense_variant	15/16	1	NM_007325.5	ENSP00000478489	P4
GRIA3	ENST00000622768.5	c.2497G>A	p.Gly833Arg	missense_variant	15/16	5	NM_000828.5	ENSP00000481554	A1
GRIA3	ENST00000620581.4	c.*137G>A		3_prime_UTR_variant, NMD_transcript_variant	16/17	1		ENSP00000481875
GRIA3	ENST00000460123.1	n.134G>A		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Syndromic X-linked intellectual disability 94 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Nov 13, 2007

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Mar 12, 2024

Published functional studies demonstrate G833R is damaging to GluR3 protein function (PMID: 17989220); Not observed 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: 17989220, 24721225, 26350204) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.88	D;D;.
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Pathogenic	0.99	D;.;D
M_CAP	Pathogenic	0.86	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Uncertain	-0.049	T
MutationAssessor	Pathogenic	3.4	M;M;M
MutationTaster	Benign	1.0	A;A;A;A
PrimateAI	Pathogenic	0.93	D
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.97
MutPred		0.93		Gain of methylation at G833 (P = 0.0062);Gain of methylation at G833 (P = 0.0062);Gain of methylation at G833 (P = 0.0062);
MVP		1.0
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.99
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: rs137852350; hg19: chrX-122616707;