14-77327941-G-T

Variant names:

• chr14-77327941-G-T
• rs773031901
• NM_145870.3:c.246G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_145870.3(GSTZ1):​c.246G>T​(p.Met82Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,652 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M82T) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GSTZ1 NM_145870.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.75
• Publications: 0 publications found

Genes affected

GSTZ1 (HGNC:4643): (glutathione S-transferase zeta 1) This gene is a member of the glutathione S-transferase (GSTs) super-family which encodes multifunctional enzymes important in the detoxification of electrophilic molecules, including carcinogens, mutagens, and several therapeutic drugs, by conjugation with glutathione. This enzyme catalyzes the conversion of maleylacetoacetate to fumarylacetoacatate, which is one of the steps in the phenylalanine/tyrosine degradation pathway. Deficiency of a similar gene in mouse causes oxidative stress. Several transcript variants of this gene encode multiple protein isoforms. [provided by RefSeq, Jul 2015]

GSTZ1 Gene-Disease associations (from GenCC):

• maleylacetoacetate isomerase deficiency

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09496966).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_145870.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GSTZ1	NM_145870.3	MANE Select	c.246G>T	p.Met82Ile	missense	Exon 5 of 9	NP_665877.1	A0A0C4DFM0
	GSTZ1	NM_001363703.2		c.249G>T	p.Met83Ile	missense	Exon 5 of 9	NP_001350632.1	G3V4T6
	GSTZ1	NM_001312660.2		c.81G>T	p.Met27Ile	missense	Exon 6 of 10	NP_001299589.1	O43708-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GSTZ1	ENST00000216465.10	TSL:1 MANE Select	c.246G>T	p.Met82Ile	missense	Exon 5 of 9	ENSP00000216465.5	A0A0C4DFM0
	GSTZ1	ENST00000361389.8	TSL:1	c.81G>T	p.Met27Ile	missense	Exon 6 of 10	ENSP00000354959.4	O43708-2
	GSTZ1	ENST00000553838.5	TSL:1	n.775G>T		non_coding_transcript_exon	Exon 4 of 4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461652 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727144

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53386

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111836

Other (OTH) AF: 0.00 AC: 0 AN: 60386

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	11
DANN	Benign	0.92
DEOGEN2	Benign	0.0051	T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.038	N
LIST_S2	Uncertain	0.95	D
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.095	T
MetaSVM	Benign	-1.1	T
PhyloP100		-1.7
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-0.28	N
REVEL	Benign	0.072
Sift	Benign	0.082	T
Sift4G	Benign	0.13	T
Vest4		0.11
MutPred		0.34		Gain of catalytic residue at P84 (P = 0.0426)
MVP		0.35
MPC		0.052
ClinPred		0.36	T
GERP RS		-9.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
gMVP		0.73
Mutation Taster		=77/23	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs773031901; hg19: chr14-77794284;