rs1555050171

Positions:

• chr11-105926821-C-G

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate PP5

The NM_000829.4(GRIA4):​c.1928C>G​(p.Ala643Gly) 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. A643D) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GRIA4 NM_000829.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 7.91

Genes affected

GRIA4 (HGNC:4574): (glutamate ionotropic receptor AMPA type subunit 4) 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 of this gene results in transcript variants encoding different isoforms, which may vary in their signal transduction properties. Some haplotypes of this gene show a positive association with schizophrenia. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_000829.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-105926821-C-A is described in Lovd as [Likely_pathogenic].
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), GRIA4. . Gene score misZ 3.4196 (greater than the threshold 3.09). Trascript score misZ 3.1365 (greater than threshold 3.09). GenCC has associacion of gene with neurodevelopmental disorder with or without seizures and gait abnormalities.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.939
• PP5: Variant 11-105926821-C-G is Pathogenic according to our data. Variant chr11-105926821-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 446208.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr11-105926821-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIA4	NM_000829.4	c.1928C>G	p.Ala643Gly	missense_variant	13/17	ENST00000282499.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIA4	ENST00000282499.10	c.1928C>G	p.Ala643Gly	missense_variant	13/17	5	NM_000829.4	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Neurodevelopmental disorder with or without seizures and gait abnormalities Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Feb 07, 2018

- -

Intellectual disability Pathogenic:1

Likely pathogenic, no assertion criteria provided

clinical testing

Institute of Human Genetics, University of Leipzig Medical Center

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.93	D;.;.;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;.;.
M_CAP	Uncertain	0.093	D
MetaRNN	Pathogenic	0.94	D;D;D;D
MetaSVM	Uncertain	0.37	D
MutationAssessor	Pathogenic	3.7	H;.;.;H
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.87	D
PROVEAN	Uncertain	-3.6	D;D;D;D
REVEL	Pathogenic	0.66
Sift	Uncertain	0.0010	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;D;D;D
Vest4		0.72
MutPred		0.90		Loss of stability (P = 0.0915);Loss of stability (P = 0.0915);Loss of stability (P = 0.0915);Loss of stability (P = 0.0915);
MVP		0.84
MPC		2.2
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.94
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1555050171; hg19: chr11-105797547;