21-29917613-A-G

Variant names:

• chr21-29917613-A-G
• rs460583
• NM_001330994.2:c.118+21770T>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001330994.2(GRIK1):​c.118+21770T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.233 in 151,902 control chromosomes in the GnomAD database, including 4,934 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 0.23 (4934 hom., cov: 32)
• Consequence: GRIK1 NM_001330994.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.804
• Publications: 4 publications found

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

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.38 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001330994.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIK1	NM_001330994.2	MANE Select	c.118+21770T>C		intron	N/A	NP_001317923.1
	GRIK1	NM_001330993.2		c.118+21770T>C		intron	N/A	NP_001317922.1
	GRIK1	NM_001320616.2		c.118+21770T>C		intron	N/A	NP_001307545.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRIK1	ENST00000327783.9	TSL:5 MANE Select	c.118+21770T>C		intron	N/A	ENSP00000327687.4
	GRIK1	ENST00000399907.6	TSL:1	c.118+21770T>C		intron	N/A	ENSP00000382791.1
	GRIK1	ENST00000389125.7	TSL:1	c.118+21770T>C		intron	N/A	ENSP00000373777.3

Frequencies

GnomAD3 genomes AF: 0.233 AC: 35366 AN: 151784 Hom.: 4925 Cov.: 32

Gnomad AFR AF: 0.385

Gnomad AMI AF: 0.0375

Gnomad AMR AF: 0.221

Gnomad ASJ AF: 0.128

Gnomad EAS AF: 0.184

Gnomad SAS AF: 0.317

Gnomad FIN AF: 0.174

Gnomad MID AF: 0.228

Gnomad NFE AF: 0.159

Gnomad OTH AF: 0.216

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

GnomAD4 genome AF: 0.233 AC: 35407 AN: 151902 Hom.: 4934 Cov.: 32 AF XY: 0.235 AC XY: 17457 AN XY: 74256

African (AFR) AF: 0.385 AC: 15953 AN: 41430

American (AMR) AF: 0.222 AC: 3379 AN: 15244

Ashkenazi Jewish (ASJ) AF: 0.128 AC: 443 AN: 3458

East Asian (EAS) AF: 0.184 AC: 952 AN: 5172

South Asian (SAS) AF: 0.314 AC: 1515 AN: 4820

European-Finnish (FIN) AF: 0.174 AC: 1846 AN: 10584

Middle Eastern (MID) AF: 0.241 AC: 71 AN: 294

European-Non Finnish (NFE) AF: 0.159 AC: 10763 AN: 67886

Other (OTH) AF: 0.214 AC: 451 AN: 2108

Alfa AF: 0.177 Hom.: 3921

Bravo AF: 0.244

Asia WGS AF: 0.262 AC: 912 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	0.31
DANN	Benign	0.46
PhyloP100		-0.80
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs460583; hg19: chr21-31289931;