rs75863437

Positions:

chr20-34932027-G-A

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_000178.4(GSS):c.941C>T(p.Pro314Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000569 in 1,614,176 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0027 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00035 ( 2 hom. )

Consequence

GSS
NM_000178.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: 0.855

Variant links:

Genes affected

GSS (HGNC:4624): (glutathione synthetase) Glutathione is important for a variety of biological functions, including protection of cells from oxidative damage by free radicals, detoxification of xenobiotics, and membrane transport. The protein encoded by this gene functions as a homodimer to catalyze the second step of glutathione biosynthesis, which is the ATP-dependent conversion of gamma-L-glutamyl-L-cysteine to glutathione. Defects in this gene are a cause of glutathione synthetase deficiency. [provided by RefSeq, Jul 2008]

GSS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.010305792).

BP6

Variant 20-34932027-G-A is Benign according to our data. Variant chr20-34932027-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 8530.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=4, Uncertain_significance=1}.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00269 (409/152314) while in subpopulation AFR AF= 0.00914 (380/41586). AF 95% confidence interval is 0.00838. There are 0 homozygotes in gnomad4. There are 189 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
GSS	NM_000178.4 linkuse as main transcript	c.941C>T	p.Pro314Leu	missense_variant	10/13	ENST00000651619.1	NP_000169.1
GSS	NM_001322494.1 linkuse as main transcript	c.941C>T	p.Pro314Leu	missense_variant	10/13		NP_001309423.1
GSS	NM_001322495.1 linkuse as main transcript	c.941C>T	p.Pro314Leu	missense_variant	10/13		NP_001309424.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GSS	ENST00000651619.1 linkuse as main transcript	c.941C>T	p.Pro314Leu	missense_variant	10/13		NM_000178.4	ENSP00000498303	P1	P48637-1

Frequencies

GnomAD3 genomes

AF:

0.00269

AC:

410

AN:

152196

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00919

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000982

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.000824

AC:

207

AN:

251350

Hom.:

AF XY:

0.000699

AC XY:

AN XY:

135904

show subpopulations

Gnomad AFR exome

AF:

0.00936

Gnomad AMR exome

AF:

0.000549

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00120

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000106

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000348

AC:

509

AN:

1461862

Hom.:

Cov.:

AF XY:

0.000322

AC XY:

234

AN XY:

727232

show subpopulations

Gnomad4 AFR exome

AF:

0.00965

Gnomad4 AMR exome

AF:

0.000604

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00159

Gnomad4 SAS exome

AF:

0.0000812

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000486

Gnomad4 OTH exome

AF:

0.000563

GnomAD4 genome

AF:

0.00269

AC:

409

AN:

152314

Hom.:

Cov.:

AF XY:

0.00254

AC XY:

189

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.00914

Gnomad4 AMR

AF:

0.000980

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000386

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.000947

Alfa

AF:

0.000577

Hom.:

Bravo

AF:

0.00327

ESP6500AA

AF:

0.00794

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000997

AC:

121

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Inherited glutathione synthetase deficiency

Uncertain:1Benign:2

Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 28, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to rule this variant out of causing disease. Therefore, this variant is classified as benign. -
Uncertain significance, criteria provided, single submitter	reference population	Soonchunhyang University Bucheon Hospital, Soonchunhyang University Medical Center	Mar 18, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 27, 2024	- -

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 22, 2022	Variant summary: GSS c.941C>T (p.Pro314Leu) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00082 in 251350 control chromosomes, including one homozygote in the general population (gnomAD). The variant occurs predominantly at a frequency of 0.0094 within the African or African-American subpopulation in the gnomAD database, which is approximately 3 fold of the estimated maximal expected allele frequency for a pathogenic variant in GSS causing Glutathione Synthetase Deficiency phenotype (0.003), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. c.941C>T has been reported in the literature in one individual affected with Glutathione Synthetase Deficiency (Shi_1996), occuring in cis with a second pathogenic variant (GSS c.1139_1144del, p.Val380_Gln381del), providing supporting evidence for a benign role. Experimental evidence evaluating protein function demonstrated the variant does not impact enzyme function in vitro (Njallson_2004) or in a yeast complementation assay (Shi_1996). Four ClinVar submitters have assessed the variant since 2014: one classified the variant as of uncertain significance and three as benign. Based on the evidence outlined above, the variant was classified as benign. -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 22, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Mar 22, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.22

CADD

Benign

DANN

Benign

0.80

DEOGEN2

Pathogenic

0.97

.;D;.;D;D;.

Eigen

Benign

-0.56

Eigen_PC

Benign

-0.72

FATHMM_MKL

Benign

0.49

LIST_S2

Uncertain

0.90

.;.;D;.;D;D

MetaRNN

Benign

0.010

T;T;T;T;T;T

MetaSVM

Uncertain

0.24

MutationAssessor

Pathogenic

3.5

.;H;.;H;H;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Benign

0.27

PROVEAN

Pathogenic

-8.0

.;D;.;.;.;D

REVEL

Uncertain

0.41

Sift

Benign

0.056

.;T;.;.;.;D

Sift4G

Benign

0.065

.;T;.;.;.;T

Polyphen

0.41

.;B;.;B;B;.

Vest4

0.27, 0.29

MVP

0.86

MPC

0.24

ClinPred

0.14

GERP RS

-4.4

Varity_R

0.36

gMVP

0.57

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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