chr21-29595188-C-A

Variant names:

• chr21-29595188-C-A
• rs2832407
• NM_001330994.2:c.1251+1338G>T

Variant summary

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

The NM_001330994.2(GRIK1):​c.1251+1338G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.511 in 151,768 control chromosomes in the GnomAD database, including 22,801 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 0.51 (22801 hom., cov: 30)
• Consequence: GRIK1 NM_001330994.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.885
• Publications: 49 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]

BACH1 (HGNC:935): (BTB domain and CNC homolog 1) This gene encodes a transcription factor that belongs to the cap'n'collar type of basic region leucine zipper factor family (CNC-bZip). The encoded protein contains broad complex, tramtrack, bric-a-brac/poxvirus and zinc finger (BTB/POZ) domains, which is atypical of CNC-bZip family members. These BTB/POZ domains facilitate protein-protein interactions and formation of homo- and/or hetero-oligomers. When this encoded protein forms a heterodimer with MafK, it functions as a repressor of Maf recognition element (MARE) and transcription is repressed. Multiple alternatively spliced transcript variants have been identified for this gene. [provided by RefSeq, May 2009]

ACMG classification

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

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.801 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GRIK1	NM_001330994.2	c.1251+1338G>T		intron_variant	Intron 9 of 17	ENST00000327783.9	NP_001317923.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GRIK1	ENST00000327783.9	c.1251+1338G>T		intron_variant	Intron 9 of 17	5	NM_001330994.2	ENSP00000327687.4

Frequencies

GnomAD3 genomes AF: 0.511 AC: 77508 AN: 151648 Hom.: 22763 Cov.: 30

Gnomad AFR AF: 0.808

Gnomad AMI AF: 0.530

Gnomad AMR AF: 0.484

Gnomad ASJ AF: 0.313

Gnomad EAS AF: 0.590

Gnomad SAS AF: 0.470

Gnomad FIN AF: 0.406

Gnomad MID AF: 0.335

Gnomad NFE AF: 0.362

Gnomad OTH AF: 0.464

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

GnomAD4 genome AF: 0.511 AC: 77604 AN: 151768 Hom.: 22801 Cov.: 30 AF XY: 0.512 AC XY: 37931 AN XY: 74132

African (AFR) AF: 0.808 AC: 33446 AN: 41384

American (AMR) AF: 0.484 AC: 7375 AN: 15250

Ashkenazi Jewish (ASJ) AF: 0.313 AC: 1084 AN: 3468

East Asian (EAS) AF: 0.589 AC: 3027 AN: 5136

South Asian (SAS) AF: 0.469 AC: 2250 AN: 4796

European-Finnish (FIN) AF: 0.406 AC: 4275 AN: 10520

Middle Eastern (MID) AF: 0.340 AC: 100 AN: 294

European-Non Finnish (NFE) AF: 0.362 AC: 24590 AN: 67908

Other (OTH) AF: 0.464 AC: 976 AN: 2104

Alfa AF: 0.400 Hom.: 35918

Bravo AF: 0.531

Asia WGS AF: 0.580 AC: 2016 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.19
DANN	Benign	0.45
PhyloP100		-0.89
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: rs2832407; hg19: chr21-30967508;