rs28495775

Positions:

• chr4-157297399-A-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001083619.3(GRIA2):​c.230-6153A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.25 in 152,072 control chromosomes in the GnomAD database, including 5,502 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.25 (5502 hom., cov: 32)
• Consequence: GRIA2 NM_001083619.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.22

Genes affected

GRIA2 (HGNC:4572): (glutamate ionotropic receptor AMPA 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 a family of glutamate receptors that are sensitive to alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA), and function as ligand-activated cation channels. These channels are assembled from 4 related subunits, GRIA1-4. The subunit encoded by this gene (GRIA2) is subject to RNA editing (CAG->CGG; Q->R) within the second transmembrane domain, which is thought to render the channel impermeable to Ca(2+). Human and animal studies suggest that pre-mRNA editing is essential for brain function, and defective GRIA2 RNA editing at the Q/R site may be relevant to amyotrophic lateral sclerosis (ALS) etiology. Alternative splicing, resulting in transcript variants encoding different isoforms, (including the flip and flop isoforms that vary in their signal transduction properties), has been noted for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.397 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIA2	NM_001083619.3	c.230-6153A>G		intron_variant		ENST00000264426.14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIA2	ENST00000264426.14	c.230-6153A>G		intron_variant		1	NM_001083619.3	P4

Frequencies

GnomAD3 genomes AF: 0.249 AC: 37894 AN: 151954 Hom.: 5479 Cov.: 32

Gnomad AFR AF: 0.401

Gnomad AMI AF: 0.160

Gnomad AMR AF: 0.184

Gnomad ASJ AF: 0.218

Gnomad EAS AF: 0.159

Gnomad SAS AF: 0.172

Gnomad FIN AF: 0.190

Gnomad MID AF: 0.237

Gnomad NFE AF: 0.196

Gnomad OTH AF: 0.244

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.250 AC: 37963 AN: 152072 Hom.: 5502 Cov.: 32 AF XY: 0.247 AC XY: 18341 AN XY: 74328

Gnomad4 AFR AF: 0.402

Gnomad4 AMR AF: 0.184

Gnomad4 ASJ AF: 0.218

Gnomad4 EAS AF: 0.159

Gnomad4 SAS AF: 0.172

Gnomad4 FIN AF: 0.190

Gnomad4 NFE AF: 0.196

Gnomad4 OTH AF: 0.245

Alfa AF: 0.144 Hom.: 347

Bravo AF: 0.257

Asia WGS AF: 0.195 AC: 678 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	0.13
DANN	Benign	0.70

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: rs28495775; hg19: chr4-158218551;