14-77329325-A-G

Variant names:

• chr14-77329325-A-G
• rs8177569
• NM_145870.3:c.421+124A>G

Variant summary

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

The NM_145870.3(GSTZ1):​c.421+124A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000172 in 579,718 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000017 (0 hom.)
• Consequence: GSTZ1 NM_145870.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.625
• 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: 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=-0.8).

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.421+124A>G		intron	N/A	NP_665877.1	A0A0C4DFM0
	GSTZ1	NM_001363703.2		c.424+124A>G		intron	N/A	NP_001350632.1	G3V4T6
	GSTZ1	NM_145871.3		c.295+124A>G		intron	N/A	NP_665878.2	A0A0A0MR33

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GSTZ1	ENST00000216465.10	TSL:1 MANE Select	c.421+124A>G		intron	N/A	ENSP00000216465.5	A0A0C4DFM0
	GSTZ1	ENST00000361389.8	TSL:1	c.256+124A>G		intron	N/A	ENSP00000354959.4	O43708-2
	GSTZ1	ENST00000553586.5	TSL:5	c.424+124A>G		intron	N/A	ENSP00000451976.1	G3V4T6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000172 AC: 1 AN: 579718 Hom.: 0 Cov.: 6 AF XY: 0.00000323 AC XY: 1 AN XY: 309982

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 16344

American (AMR) AF: 0.00 AC: 0 AN: 34272

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 18982

East Asian (EAS) AF: 0.00 AC: 0 AN: 32732

South Asian (SAS) AF: 0.00 AC: 0 AN: 62384

European-Finnish (FIN) AF: 0.0000223 AC: 1 AN: 44816

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2420

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 336992

Other (OTH) AF: 0.00 AC: 0 AN: 30776

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	13
DANN	Benign	0.76
PhyloP100		0.63

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

Other links and lift over

dbSNP: rs8177569; hg19: chr14-77795668;