rs62638202

Positions:

chr5-178994497-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2PP3_StrongPP5_Moderate

The NM_000843.4(GRM6):c.448G>A(p.Gly150Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000154 in 1,432,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

GRM6
NM_000843.4 missense

Scores

Clinical Significance

Likely pathogenic criteria provided, single submitter P:2O:1

Conservation

PhyloP100: 5.91

Variant links:

Genes affected

GRM6 (HGNC:4598): (glutamate metabotropic receptor 6) L-glutamate is the major excitatory neurotransmitter in the central nervous system and activates both ionotropic and metabotropic glutamate receptors. Glutamatergic neurotransmission is involved in most aspects of normal brain function and can be perturbed in many neuropathologic conditions. The metabotropic glutamate receptors are a family of G protein-coupled receptors, that have been divided into 3 groups on the basis of sequence homology, putative signal transduction mechanisms, and pharmacologic properties. Group I includes GRM1 and GRM5 and these receptors have been shown to activate phospholipase C. Group II includes GRM2 and GRM3 while Group III includes GRM4, GRM6, GRM7 and GRM8. Group II and III receptors are linked to the inhibition of the cyclic AMP cascade but differ in their agonist selectivities. Mutations in this gene result in congenital stationary night blindness type 1B. [provided by RefSeq, May 2018]

GRM6 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.981

PP5

Variant 5-178994497-C-T is Pathogenic according to our data. Variant chr5-178994497-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 5843.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GRM6	NM_000843.4 linkuse as main transcript	c.448G>A	p.Gly150Ser	missense_variant	2/11	ENST00000517717.3	NP_000834.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
GRM6	ENST00000517717.3 linkuse as main transcript	c.448G>A	p.Gly150Ser	missense_variant	2/11	5	NM_000843.4	ENSP00000430767	P1
GRM6	ENST00000231188.9 linkuse as main transcript	c.448G>A	p.Gly150Ser	missense_variant	1/10	2		ENSP00000231188	P1
GRM6	ENST00000650031.1 linkuse as main transcript	c.448G>A	p.Gly150Ser	missense_variant	3/12			ENSP00000497110	P1

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

151968

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000736

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000133

AC:

AN:

1280910

Hom.:

Cov.:

AF XY:

0.0000127

AC XY:

AN XY:

629678

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000150

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000146

Gnomad4 OTH exome

AF:

0.0000190

GnomAD4 genome

AF:

0.0000329

AC:

AN:

151968

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74226

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000736

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2Other:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Pathogenic:1Other:1

Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 30, 2021	In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Experimental studies have shown that this missense change affects GRM6 function (PMID: 17405131). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt GRM6 protein function. ClinVar contains an entry for this variant (Variation ID: 5843). This missense change has been observed in individual(s) with congenital stationary night blindness (PMID: 15781871). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is present in population databases (rs62638202, gnomAD 0.007%). This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 150 of the GRM6 protein (p.Gly150Ser). -
not provided, no classification provided	literature only	Retina International	-	- -

Congenital stationary night blindness 1B

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 29, 2005

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Pathogenic

0.53

BayesDel_noAF

Pathogenic

0.53

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.77

D;D;D

Eigen

Pathogenic

0.88

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Uncertain

0.90

LIST_S2

Pathogenic

0.99

D;.;.

M_CAP

Uncertain

0.25

MetaRNN

Pathogenic

0.98

D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.0

H;H;H

MutationTaster

Benign

1.0

A;A

PrimateAI

Pathogenic

0.94

PROVEAN

Pathogenic

-4.5

D;D;.

REVEL

Pathogenic

0.97

Sift

Uncertain

0.0010

D;D;.

Sift4G

Uncertain

0.0030

D;D;.

Polyphen

1.0

D;D;D

Vest4

0.95

MutPred

0.91

Gain of glycosylation at G150 (P = 0.0135);Gain of glycosylation at G150 (P = 0.0135);Gain of glycosylation at G150 (P = 0.0135);

MVP

0.95

MPC

2.5

ClinPred

1.0

GERP RS

5.0

Varity_R

0.70

gMVP

0.77

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over