chr21-29640839-T-C

Position:

• chr21-29640839-T-C

Variant summary

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

The NM_001330994.2(GRIK1):​c.1098+1987A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.259 in 151,608 control chromosomes in the GnomAD database, including 5,130 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 0.26 (5130 hom., cov: 31)
• Consequence: GRIK1 NM_001330994.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.469

Genes affected

GRIK1 (HGNC:4579): (glutamate ionotropic receptor kainate type subunit 1) 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 (CAG->CGG; Q->R) within the second transmembrane domain, which is thought to alter the properties of ion flow. Alternative splicing, resulting in transcript variants encoding different isoforms, 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=-0.86).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.273 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIK1	NM_001330994.2	c.1098+1987A>G		intron_variant		ENST00000327783.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIK1	ENST00000327783.9	c.1098+1987A>G		intron_variant		5	NM_001330994.2	A1

Frequencies

GnomAD3 genomes AF: 0.259 AC: 39210 AN: 151492 Hom.: 5114 Cov.: 31

Gnomad AFR AF: 0.277

Gnomad AMI AF: 0.320

Gnomad AMR AF: 0.229

Gnomad ASJ AF: 0.222

Gnomad EAS AF: 0.239

Gnomad SAS AF: 0.198

Gnomad FIN AF: 0.237

Gnomad MID AF: 0.222

Gnomad NFE AF: 0.265

Gnomad OTH AF: 0.262

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

GnomAD4 genome AF: 0.259 AC: 39270 AN: 151608 Hom.: 5130 Cov.: 31 AF XY: 0.256 AC XY: 18937 AN XY: 74082

Gnomad4 AFR AF: 0.277

Gnomad4 AMR AF: 0.229

Gnomad4 ASJ AF: 0.222

Gnomad4 EAS AF: 0.239

Gnomad4 SAS AF: 0.199

Gnomad4 FIN AF: 0.237

Gnomad4 NFE AF: 0.265

Gnomad4 OTH AF: 0.262

Alfa AF: 0.257 Hom.: 10156

Bravo AF: 0.261

Asia WGS AF: 0.260 AC: 903 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	7.8
DANN	Benign	0.41

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: rs363598; hg19: chr21-31013159;