6-146434255-C-G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001278064.2(GRM1):c.3044C>G(p.Pro1015Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000111 in 1,600,386 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P1015S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

GRM1
NM_001278064.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.70

Publications

1 publications found

Variant links:

Genes affected

GRM1 (HGNC:4593): (glutamate metabotropic receptor 1) This gene encodes a metabotropic glutamate receptor that functions by activating phospholipase C. 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 canonical alpha isoform of the encoded protein is a disulfide-linked homodimer whose activity is mediated by a G-protein-coupled phosphatidylinositol-calcium second messenger system. This gene may be associated with many disease states, including schizophrenia, bipolar disorder, depression, and breast cancer. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, May 2013]

GRM1 Gene-Disease associations (from GenCC):

spinocerebellar ataxia 44
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
autosomal recessive spinocerebellar ataxia 13
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, G2P

GRM1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

BP4

Computational evidence support a benign effect (MetaRNN=0.10593167).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GRM1	NM_001278064.2 link	c.3044C>G	p.Pro1015Arg	missense_variant	Exon 8 of 8	ENST00000282753.6	NP_001264993.1	Q13255-1Q59HC2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GRM1	ENST00000282753.6 link	c.3044C>G	p.Pro1015Arg	missense_variant	Exon 8 of 8	1	NM_001278064.2	ENSP00000282753.1		Q13255-1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152232

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:

0.000103

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000537

AC:

AN:

242132

AF XY:

0.0000535

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000119

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000117

AC:

170

AN:

1448154

Hom.:

Cov.:

AF XY:

0.000124

AC XY:

AN XY:

718646

show subpopulations

African (AFR)

AF:

0.0000302

AC:

AN:

33092

American (AMR)

AF:

0.00

AC:

AN:

44020

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25126

East Asian (EAS)

AF:

0.00

AC:

AN:

39462

South Asian (SAS)

AF:

0.00

AC:

AN:

84748

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52952

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5686

European-Non Finnish (NFE)

AF:

0.000150

AC:

166

AN:

1103422

Other (OTH)

AF:

0.0000503

AC:

AN:

59646

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.548

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74364

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41474

American (AMR)

AF:

0.00

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5176

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

68044

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.518

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000126

Hom.:

Bravo

AF:

0.0000453

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000659

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Sep 20, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 1015 of the GRM1 protein (p.Pro1015Arg). This variant is present in population databases (rs199777173, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with GRM1-related conditions. ClinVar contains an entry for this variant (Variation ID: 585962). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Dec 15, 2017

Athena Diagnostics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Uncertain:1

Jul 07, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: GRM1 c.3044C>G (p.Pro1015Arg) results in a non-conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 5.4e-05 in 242132 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in GRM1 causing Autosomal Recessive Spinocerebellar Ataxia 13, allowing no conclusion about variant significance. To our knowledge, no occurrence of c.3044C>G in individuals affected with Autosomal Recessive Spinocerebellar Ataxia 13 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 585962). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.28

CADD

Benign

(source)

DANN

Benign

0.92

DEOGEN2

Benign

0.14

T;T

Eigen

Benign

-0.53

Eigen_PC

Benign

-0.45

FATHMM_MKL

Benign

0.34

LIST_S2

Benign

0.29

T;.

M_CAP

Uncertain

0.22

MetaRNN

Benign

0.11

T;T

MetaSVM

Benign

-0.57

MutationAssessor

Benign

0.34

N;N

PhyloP100

1.7

PrimateAI

Benign

0.39

PROVEAN

Benign

-0.77

N;N

REVEL

Benign

0.20

Sift

Benign

0.051

T;T

Sift4G

Uncertain

0.0060

D;D

Polyphen

0.077

B;B

Vest4

0.24

MVP

0.40

MPC

0.73

ClinPred

0.046

GERP RS

4.1

Varity_R

0.075

gMVP

0.42

Mutation Taster

=79/21

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over