rs2081370708

Variant names:

• chr20-34928643-G-A
• rs2081370708
• NM_000178.4:c.*185C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000178.4(GSS):​c.*185C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 680,416 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: GSS NM_000178.4 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.945
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• inherited glutathione synthetase deficiency

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• glutathione synthetase deficiency with 5-oxoprolinuria

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.76).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GSS	NM_000178.4	c.*185C>T		3_prime_UTR_variant	Exon 13 of 13	ENST00000651619.1	NP_000169.1
GSS	NM_001322494.1	c.*185C>T		3_prime_UTR_variant	Exon 13 of 13		NP_001309423.1
GSS	NM_001322495.1	c.*185C>T		3_prime_UTR_variant	Exon 13 of 13		NP_001309424.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GSS	ENST00000651619.1	c.*185C>T		3_prime_UTR_variant	Exon 13 of 13		NM_000178.4	ENSP00000498303.1

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 152054 Hom.: 0 Cov.: 31

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: 0.0000294

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000132 AC: 7 AN: 528362 Hom.: 0 Cov.: 6 AF XY: 0.0000178 AC XY: 5 AN XY: 281394

African (AFR) AF: 0.00 AC: 0 AN: 15062

American (AMR) AF: 0.00 AC: 0 AN: 31228

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 17292

East Asian (EAS) AF: 0.00 AC: 0 AN: 31336

South Asian (SAS) AF: 0.00 AC: 0 AN: 55350

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33064

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2340

European-Non Finnish (NFE) AF: 0.0000223 AC: 7 AN: 313728

Other (OTH) AF: 0.00 AC: 0 AN: 28962

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 152054 Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1 AN XY: 74302

African (AFR) AF: 0.00 AC: 0 AN: 41408

American (AMR) AF: 0.00 AC: 0 AN: 15254

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10592

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68004

Other (OTH) AF: 0.00 AC: 0 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inherited glutathione synthetase deficiency Uncertain:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	7.5
DANN	Benign	0.70
PhyloP100		0.94
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

Other links and lift over

dbSNP: rs2081370708; hg19: chr20-33516446;