4-92304696-T-G

Variant names:

• chr4-92304696-T-G
• rs1725285029
• NM_001510.4:c.40T>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001510.4(GRID2):​c.40T>G​(p.Trp14Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. W14R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GRID2 NM_001510.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.59
• Publications: 0 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), Orphanet, G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37276933).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRID2	NM_001510.4	MANE Select	c.40T>G	p.Trp14Gly	missense	Exon 1 of 16	NP_001501.2	O43424-1
	GRID2	NM_001440459.1		c.40T>G	p.Trp14Gly	missense	Exon 1 of 16	NP_001427388.1
	GRID2	NM_001286838.1		c.40T>G	p.Trp14Gly	missense	Exon 1 of 15	NP_001273767.1	O43424-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GRID2	ENST00000282020.9	TSL:1 MANE Select	c.40T>G	p.Trp14Gly	missense	Exon 1 of 16	ENSP00000282020.4	O43424-1
	GRID2	ENST00000510992.5	TSL:1	c.40T>G	p.Trp14Gly	missense	Exon 1 of 15	ENSP00000421257.1	O43424-2
	GRID2	ENST00000505687.5	TSL:1	n.212T>G		non_coding_transcript_exon	Exon 1 of 6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.062	T
BayesDel_noAF	Benign	-0.33
CADD	Uncertain	24
DANN	Benign	0.97
DEOGEN2	Benign	0.081	T
Eigen	Benign	-0.28
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Benign	0.54	T
M_CAP	Benign	0.0084	T
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.0	L
PhyloP100		3.6
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.50	N
REVEL	Benign	0.15
Sift	Uncertain	0.0050	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.0	B
Vest4		0.44
MutPred		0.71		Loss of helix (P = 0.0167)
MVP		0.26
MPC		0.48
ClinPred		0.56	D
GERP RS		3.4
PromoterAI		0.023	Neutral
Varity_R		0.16
gMVP		0.46
Mutation Taster		=75/25	polymorphism

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: rs1725285029; hg19: chr4-93225847;