X-123417394-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000828.5(GRIA3):c.1501-8T>C variant causes a splice region, splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000893 in 112,026 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000089 (0 hom., 1 hem., cov: 23)
• Consequence: GRIA3 NM_000828.5 splice_region, splice_polypyrimidine_tract, intron
• Scores: Splicing: ADA: 0.00001517
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.804

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_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIA3	NM_000828.5	c.1501-8T>C		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000622768.5
GRIA3	NM_007325.5	c.1501-8T>C		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		ENST00000620443.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIA3	ENST00000620443.2	c.1501-8T>C		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		1	NM_007325.5	P4
GRIA3	ENST00000622768.5	c.1501-8T>C		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant		5	NM_000828.5	A1
GRIA3	ENST00000620581.4	c.1501-8T>C		splice_region_variant, splice_polypyrimidine_tract_variant, intron_variant, NMD_transcript_variant		1

Frequencies

GnomAD3 genomes AF: 0.00000893 AC: 1 AN: 112026 Hom.: 0 Cov.: 23 AF XY: 0.0000293 AC XY: 1 AN XY: 34186

Gnomad AFR AF: 0.0000324

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 27

GnomAD4 genome AF: 0.00000893 AC: 1 AN: 112026 Hom.: 0 Cov.: 23 AF XY: 0.0000293 AC XY: 1 AN XY: 34186

Gnomad4 AFR AF: 0.0000324

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
Cadd	Benign	7.5
Dann	Benign	0.53

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000015
dbscSNV1_RF	Benign	0.0
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: rs139058646; hg19: chrX-122551245;