13-99254912-G-A

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_001098200.2(GPR18):c.961C>T(p.Arg321Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000868 in 1,613,756 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

GPR18
NM_001098200.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.86

Variant links:

Genes affected

GPR18 (HGNC:4472): (G protein-coupled receptor 18) Predicted to enable G protein-coupled receptor activity. Predicted to be involved in positive regulation of Rho protein signal transduction and positive regulation of cytosolic calcium ion concentration involved in phospholipase C-activating G protein-coupled signaling pathway. Predicted to act upstream of or within T cell differentiation; negative regulation of leukocyte chemotaxis; and negative regulation of tumor necrosis factor production. Predicted to be located in plasma membrane. Predicted to be integral component of plasma membrane. [provided by Alliance of Genome Resources, Apr 2022]

GPR18 links:

UBAC2 (HGNC:20486): (UBA domain containing 2) Involved in negative regulation of canonical Wnt signaling pathway and negative regulation of retrograde protein transport, ER to cytosol. Acts upstream of or within protein localization to endoplasmic reticulum. Located in endoplasmic reticulum. [provided by Alliance of Genome Resources, Apr 2022]

UBAC2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.35977653).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPR18	NM_001098200.2 link	c.961C>T	p.Arg321Trp	missense_variant	Exon 2 of 2	ENST00000397470.5	NP_001091670.1	Q14330H9NIM1
UBAC2	NM_001144072.2 link	c.389+10288G>A		intron_variant	Intron 4 of 8	ENST00000403766.8	NP_001137544.1	Q8NBM4-1A0A024RE02A8K2S7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPR18	ENST00000397470.5 link	c.961C>T	p.Arg321Trp	missense_variant	Exon 2 of 2	1	NM_001098200.2	ENSP00000380610.2		Q14330
UBAC2	ENST00000403766.8 link	c.389+10288G>A		intron_variant	Intron 4 of 8	2	NM_001144072.2	ENSP00000383911.3		Q8NBM4-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152106

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251134

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135720

show subpopulations

Gnomad AFR exome

AF:

0.0000615

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:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000753

AC:

AN:

1461650

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727110

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000720

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152106

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74292

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000227

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 21, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.961C>T (p.R321W) alteration is located in exon 3 (coding exon 1) of the GPR18 gene. This alteration results from a C to T substitution at nucleotide position 961, causing the arginine (R) at amino acid position 321 to be replaced by a tryptophan (W). 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

0.19

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Benign

-0.28

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.058

T;T;T

Eigen

Benign

-0.22

Eigen_PC

Benign

-0.023

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.95

.;D;.

M_CAP

Benign

0.035

MetaRNN

Benign

0.36

T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.55

N;N;N

PrimateAI

Uncertain

0.68

PROVEAN

Benign

-2.0

N;N;N

REVEL

Benign

0.095

Sift

Uncertain

0.0010

D;D;D

Sift4G

Uncertain

0.0070

D;D;D

Polyphen

0.071

B;B;B

Vest4

0.64

MutPred

0.53

Loss of disorder (P = 0.0149);Loss of disorder (P = 0.0149);Loss of disorder (P = 0.0149);

MVP

0.61

MPC

0.38

ClinPred

0.69

GERP RS

4.4

Varity_R

0.28

gMVP

0.72

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