21-29611955-C-G

Position:

• chr21-29611955-C-G

Variant summary

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

The NM_001330994.2(GRIK1):​c.1099-13018G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.547 in 152,048 control chromosomes in the GnomAD database, including 26,076 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 0.55 (26076 hom., cov: 32)
• Consequence: GRIK1 NM_001330994.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.249

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]

GRIK1-AS2 (HGNC:):

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

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.861 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRIK1	NM_001330994.2	c.1099-13018G>C		intron_variant		ENST00000327783.9
GRIK1-AS2	NR_033368.1	n.864+14261C>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRIK1	ENST00000327783.9	c.1099-13018G>C		intron_variant		5	NM_001330994.2	A1

Frequencies

GnomAD3 genomes AF: 0.546 AC: 82995 AN: 151928 Hom.: 26021 Cov.: 32

Gnomad AFR AF: 0.868

Gnomad AMI AF: 0.366

Gnomad AMR AF: 0.500

Gnomad ASJ AF: 0.325

Gnomad EAS AF: 0.621

Gnomad SAS AF: 0.501

Gnomad FIN AF: 0.431

Gnomad MID AF: 0.392

Gnomad NFE AF: 0.392

Gnomad OTH AF: 0.500

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

GnomAD4 genome AF: 0.547 AC: 83111 AN: 152048 Hom.: 26076 Cov.: 32 AF XY: 0.547 AC XY: 40602 AN XY: 74286

Gnomad4 AFR AF: 0.869

Gnomad4 AMR AF: 0.500

Gnomad4 ASJ AF: 0.325

Gnomad4 EAS AF: 0.621

Gnomad4 SAS AF: 0.501

Gnomad4 FIN AF: 0.431

Gnomad4 NFE AF: 0.392

Gnomad4 OTH AF: 0.499

Alfa AF: 0.487 Hom.: 2504

Bravo AF: 0.566

Asia WGS AF: 0.620 AC: 2156 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	2.5
DANN	Benign	0.43

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: rs363449; hg19: chr21-30984275;