Genetic Variant GRM7:c.736+31077T>C (chr3-7177745-T-C) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The NM_000844.4(GRM7):c.736+31077T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.389 in 152,044 control chromosomes in the GnomAD database, including 12,635 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 0.39 ( 12635 hom., cov: 32)

Consequence

GRM7
NM_000844.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.436

Publications

0 publications found

Variant links:

Genes affected

GRM7 (HGNC:4599): (glutamate metabotropic receptor 7) L-glutamate is the major excitatory neurotransmitter in the central nervous system, and it 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 three 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. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2009]

GRM7 Gene-Disease associations (from GenCC):

neurodevelopmental disorder with seizures, hypotonia, and brain imaging abnormalities
Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics

GRM7 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.86).

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.566 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GRM7	NM_000844.4 link	c.736+31077T>C		intron_variant	Intron 2 of 9	ENST00000357716.9	NP_000835.1	Q14831-1B2R693Q59G95

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GRM7	ENST00000357716.9 link	c.736+31077T>C		intron_variant	Intron 2 of 9	1	NM_000844.4	ENSP00000350348.4		Q14831-1
GRM7	ENST00000440923.7 link	n.736+31077T>C		intron_variant	Intron 2 of 11	2		ENSP00000412329.3		H7C3K2

Frequencies

GnomAD3 genomes

AF:

0.389

AC:

59067

AN:

151926

Hom.:

12596

Cov.:

show subpopulations

Gnomad AFR

AF:

0.571

Gnomad AMI

AF:

0.248

Gnomad AMR

AF:

0.243

Gnomad ASJ

AF:

0.213

Gnomad EAS

AF:

0.213

Gnomad SAS

AF:

0.271

Gnomad FIN

AF:

0.402

Gnomad MID

AF:

0.199

Gnomad NFE

AF:

0.344

Gnomad OTH

AF:

0.333

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

GnomAD4 genome

AF:

0.389

AC:

59154

AN:

152044

Hom.:

12635

Cov.:

AF XY:

0.384

AC XY:

28515

AN XY:

74318

show subpopulations

African (AFR)

AF:

0.572

AC:

23710

AN:

41466

American (AMR)

AF:

0.242

AC:

3701

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.213

AC:

738

AN:

3466

East Asian (EAS)

AF:

0.213

AC:

1100

AN:

5168

South Asian (SAS)

AF:

0.270

AC:

1300

AN:

4808

European-Finnish (FIN)

AF:

0.402

AC:

4251

AN:

10578

Middle Eastern (MID)

AF:

0.207

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.344

AC:

23360

AN:

67958

Other (OTH)

AF:

0.334

AC:

707

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

1725

3450

5174

6899

8624

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

546

1092

1638

2184

2730

<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:

0.347

Hom.:

7069

Bravo

AF:

0.382

Asia WGS

AF:

0.324

AC:

1128

AN:

3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.86

CADD

Benign

5.4

(source)

DANN

Benign

0.43

PhyloP100

0.44

Mutation Taster

=100/0

polymorphism (auto)

(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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over