chr4-93331209-G-C

Variant names:

• chr4-93331209-G-C
• rs1433666
• NM_001510.4:c.1246-64398G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001510.4(GRID2):​c.1246-64398G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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: not found (cov: 24)
• Consequence: GRID2 NM_001510.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.148
• Publications: 6 publications found

Genes affected

GRID2 (HGNC:4576): (glutamate ionotropic receptor delta type subunit 2) The protein encoded by this gene is a member of the family of ionotropic glutamate receptors which are the predominant excitatory neurotransmitter receptors in the mammalian brain. The encoded protein is a multi-pass membrane protein that is expressed selectively in cerebellar Purkinje cells. A point mutation in the mouse ortholog, associated with the phenotype named 'lurcher', in the heterozygous state leads to ataxia resulting from selective, cell-autonomous apoptosis of cerebellar Purkinje cells during postnatal development. Mice homozygous for this mutation die shortly after birth from massive loss of mid- and hindbrain neurons during late embryogenesis. This protein also plays a role in synapse organization between parallel fibers and Purkinje cells. Alternate splicing results in multiple transcript variants encoding distinct isoforms. Mutations in this gene cause cerebellar ataxia in humans. [provided by RefSeq, Apr 2014]

GRID2 Gene-Disease associations (from GenCC):

• autosomal recessive spinocerebellar ataxia 18

  Inheritance: AR, AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001510.4. 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
	GRID2	NM_001510.4	MANE Select	c.1246-64398G>C		intron	N/A	NP_001501.2
	GRID2	NM_001440459.1		c.1246-64398G>C		intron	N/A	NP_001427388.1
	GRID2	NM_001286838.1		c.961-64398G>C		intron	N/A	NP_001273767.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRID2	ENST00000282020.9	TSL:1 MANE Select	c.1246-64398G>C		intron	N/A	ENSP00000282020.4
	GRID2	ENST00000611049.4	TSL:1	c.1003-64398G>C		intron	N/A	ENSP00000483084.1
	GRID2	ENST00000510992.5	TSL:1	c.961-64398G>C		intron	N/A	ENSP00000421257.1

Frequencies

GnomAD3 genomes Cov.: 24

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

GnomAD4 genome Cov.: 24

Alfa AF: 0.00 Hom.: 40118

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	0.40
DANN	Benign	0.63
PhyloP100		-0.15

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: rs1433666; hg19: chr4-94252360;