1-109739874-G-T

Position:

• chr1-109739874-G-T

Variant summary

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

The NM_000849.5(GSTM3):​c.83C>A​(p.Thr28Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GSTM3 NM_000849.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.97

Genes affected

GSTM3 (HGNC:4635): (glutathione S-transferase mu 3) Cytosolic and membrane-bound forms of glutathione S-transferase are encoded by two distinct supergene families. At present, eight distinct classes of the soluble cytoplasmic mammalian glutathione S-transferases have been identified: alpha, kappa, mu, omega, pi, sigma, theta and zeta. This gene encodes a glutathione S-transferase that belongs to the mu class. The mu class of enzymes functions in the detoxification of electrophilic compounds, including carcinogens, therapeutic drugs, environmental toxins and products of oxidative stress, by conjugation with glutathione. The genes encoding the mu class of enzymes are organized in a gene cluster on chromosome 1p13.3 and are known to be highly polymorphic. These genetic variations can change an individual's susceptibility to carcinogens and toxins as well as affect the toxicity and efficacy of certain drugs. Mutations of this class mu gene have been linked with a slight increase in a number of cancers, likely due to exposure with environmental toxins. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2008]

GSTM3 (HGNC:):

ACMG classification

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	Protein	UniProt
GSTM3	NM_000849.5	c.83C>A	p.Thr28Lys	missense_variant	3/9	ENST00000361066.7	NP_000840.2
GSTM3	NR_024537.2	n.358+366C>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GSTM3	ENST00000361066.7	c.83C>A	p.Thr28Lys	missense_variant	3/9	1	NM_000849.5	ENSP00000354357.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1402908 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 692374

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 12, 2024

The c.83C>A (p.T28K) alteration is located in exon 3 (coding exon 2) of the GSTM3 gene. This alteration results from a C to A substitution at nucleotide position 83, causing the threonine (T) at amino acid position 28 to be replaced by a lysine (K). 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	Pathogenic	0.77
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.15	T;T;.
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.95	D;.;D
M_CAP	Benign	0.011	T
MetaRNN	Uncertain	0.62	D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	M;M;.
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-5.1	D;D;D
REVEL	Uncertain	0.39
Sift	Benign	0.12	T;T;T
Sift4G	Benign	0.29	T;T;T
Polyphen		0.85	P;P;.
Vest4		0.62
MutPred		0.54		Gain of ubiquitination at T28 (P = 0.0325);Gain of ubiquitination at T28 (P = 0.0325);Gain of ubiquitination at T28 (P = 0.0325);
MVP		0.26
MPC		0.35
ClinPred		0.99	D
GERP RS		4.9
Varity_R		0.72
gMVP		0.92

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-110282496;