7-126533224-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000845.3(GRM8):c.2158C>T(p.His720Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.0000136 in 1,612,298 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

GRM8
NM_000845.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.71

Variant links:

Genes affected

GRM8 (HGNC:4600): (glutamate metabotropic receptor 8) 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. Alternatively spliced transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

GRM8 links:

LOC101928357 (HGNC:):

LOC101928357 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GRM8	NM_000845.3 linkuse as main transcript	c.2158C>T	p.His720Tyr	missense_variant	9/11	ENST00000339582.7
LOC101928357	XR_927937.3 linkuse as main transcript	n.215-1528G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GRM8	ENST00000339582.7 linkuse as main transcript	c.2158C>T	p.His720Tyr	missense_variant	9/11	5	NM_000845.3	P1	O00222-1

Frequencies

GnomAD3 genomes

AF:

0.0000264

AC:

AN:

151432

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000728

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:

0.0000953

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000200

AC:

AN:

249764

Hom.:

AF XY:

0.0000222

AC XY:

AN XY:

134978

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000232

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000123

AC:

AN:

1460866

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

726740

show subpopulations

Gnomad4 AFR exome

AF:

0.000120

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000101

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000169

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000264

AC:

AN:

151432

Hom.:

Cov.:

AF XY:

0.0000271

AC XY:

AN XY:

73858

show subpopulations

Gnomad4 AFR

AF:

0.0000728

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000953

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 21, 2021

The c.2158C>T (p.H720Y) alteration is located in exon 9 (coding exon 8) of the GRM8 gene. This alteration results from a C to T substitution at nucleotide position 2158, causing the histidine (H) at amino acid position 720 to be replaced by a tyrosine (Y). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

-0.060

Cadd

Uncertain

Dann

Uncertain

0.99

DEOGEN2

Benign

0.36

T;.;.

Eigen

Uncertain

0.47

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.96

D;.;D

M_CAP

Benign

0.063

MetaRNN

Uncertain

0.51

D;D;D

MetaSVM

Uncertain

0.49

MutationAssessor

Uncertain

2.0

M;M;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.60

PROVEAN

Uncertain

-2.9

D;D;.

REVEL

Uncertain

0.54

Sift

Benign

0.035

D;D;.

Sift4G

Uncertain

0.035

D;D;D

Polyphen

0.37

B;D;.

Vest4

0.64

MutPred

0.58

Gain of phosphorylation at H720 (P = 0.0609);Gain of phosphorylation at H720 (P = 0.0609);.;

MVP

0.71

MPC

0.83

ClinPred

0.66

GERP RS

5.6

Varity_R

0.66

gMVP

0.74

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