22-24225620-C-A

Variant names:

• chr22-24225620-C-A
• NM_004121.5:c.1262G>T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_004121.5(GGT5):​c.1262G>T​(p.Gly421Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,460,760 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: GGT5 NM_004121.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.00

Genes affected

GGT5 (HGNC:4260): (gamma-glutamyltransferase 5) This gene is a member of the gamma-glutamyl transpeptidase gene family, and some reports indicate that it is capable of cleaving the gamma-glutamyl moiety of glutathione. The protein encoded by this gene is synthesized as a single, catalytically-inactive polypeptide, that is processed post-transcriptionally to form a heavy and light subunit, with the catalytic activity contained within the small subunit. The encoded enzyme is able to convert leukotriene C4 to leukotriene D4, but appears to have distinct substrate specificity compared to gamma-glutamyl transpeptidase. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Oct 2014]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GGT5	NM_004121.5	c.1262G>T	p.Gly421Val	missense_variant	Exon 9 of 12	ENST00000327365.10	NP_004112.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GGT5	ENST00000327365.10	c.1262G>T	p.Gly421Val	missense_variant	Exon 9 of 12	1	NM_004121.5	ENSP00000330080.4
GGT5	ENST00000398292.3	c.1262G>T	p.Gly421Val	missense_variant	Exon 9 of 12	1		ENSP00000381340.3
GGT5	ENST00000263112.11	c.1166G>T	p.Gly389Val	missense_variant	Exon 8 of 11	1		ENSP00000263112.7
GGT5	ENST00000425408.5	c.68G>T	p.Gly23Val	missense_variant	Exon 2 of 6	5		ENSP00000402917.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1460760 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726782

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: 0.00000450

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Oct 29, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1262G>T (p.G421V) alteration is located in exon 9 (coding exon 9) of the GGT5 gene. This alteration results from a G to T substitution at nucleotide position 1262, causing the glycine (G) at amino acid position 421 to be replaced by a valine (V). 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	0.97
BayesDel_addAF	Pathogenic	0.41	D
BayesDel_noAF	Pathogenic	0.35
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.42	.;T;.
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.88	D;D;D
M_CAP	Pathogenic	0.56	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Uncertain	0.68	D
MutationAssessor	Pathogenic	3.9	.;H;H
PrimateAI	Uncertain	0.69	T
PROVEAN	Pathogenic	-8.2	D;D;D
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	D;D;D
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.96
MutPred		0.95		.;Loss of catalytic residue at T420 (P = 0.0858);Loss of catalytic residue at T420 (P = 0.0858);
MVP		0.96
MPC		0.82
ClinPred		1.0	D
GERP RS		4.5
Varity_R		0.98
gMVP		0.96

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-24621588;