rs121908522

Positions:

• chr2-240869249-G-A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000030.3(AGXT):​c.245G>A​(p.Gly82Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000958 in 1,461,588 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 Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000096 (0 hom.)
• Consequence: AGXT NM_000030.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8 O:1
• Conservation: PhyloP100: 7.32

Genes affected

AGXT (HGNC:341): (alanine--glyoxylate aminotransferase) This gene is expressed only in the liver and the encoded protein is localized mostly in the peroxisomes, where it is involved in glyoxylate detoxification. Mutations in this gene, some of which alter subcellular targetting, have been associated with type I primary hyperoxaluria. [provided by RefSeq, Jul 2008]

AGXT (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.996
• PP5: Variant 2-240869249-G-A is Pathogenic according to our data. Variant chr2-240869249-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 5643.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AGXT	NM_000030.3	c.245G>A	p.Gly82Glu	missense_variant	2/11	ENST00000307503.4	NP_000021.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AGXT	ENST00000307503.4	c.245G>A	p.Gly82Glu	missense_variant	2/11	1	NM_000030.3	ENSP00000302620.3
AGXT	ENST00000472436.1	n.265G>A		non_coding_transcript_exon_variant	2/5	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000199 AC: 5 AN: 251218 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135828

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000163

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000958 AC: 14 AN: 1461588 Hom.: 0 Cov.: 34 AF XY: 0.0000151 AC XY: 11 AN XY: 727092

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: 0.000151

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Primary hyperoxaluria, type I Pathogenic:6 Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 17, 2000	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 15, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Neuberg Centre For Genomic Medicine, NCGM	-	The observed missense variant c.245G>A (p.Gly82Glu) in gene has been reported in homozygous and compound heterozygous state individuals affected with Hyperoxaluria, primary (Milliner DS et al. 2022; Coulter-Mackie MB et al. 2001). Experimental studies have shown that this missense change affects AGXT function (Cellini B et al. 2007). The p.Gly82Glu variant has allele frequency 0.002% in gnomAD Exomes. This variant has been submitted to the ClinVar database as Likely Pathogenic / Pathogenic (multiple submitters). The amino acid change p.Gly82Glu in AGXT is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. The amino acid Gly at position 82 is changed to a Glu changing protein sequence and it might alter its composition and physico-chemical properties. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	in vitro	Clinical Biochemistry Laboratory, Health Services Laboratory	Nov 27, 2014	- -
Pathogenic, no assertion criteria provided	literature only	Yale Center for Mendelian Genomics, Yale University	Jan 17, 2019	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Mar 07, 2016	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Primary hyperoxaluria Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

May 10, 2023

Variant summary: AGXT c.245G>A (p.Gly82Glu) results in a non-conservative amino acid change located in the Aminotransferase class V domain (IPR000192) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 2e-05 in 251218 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.245G>A has been reported in the literature in multiple homozygous and compound heterozygous individuals affected with Primary Hyperoxaluria Type 1 (e.g., Purdue_1992, Coulter-Mackie_2001). These data indicate that the variant is very likely to be associated with disease. Several publications report experimental evidence evaluating an impact on protein function, finding that the variant results in less than ~2% of normal catalytic activity in both patient derived samples and in an in vitro expression system (e.g., Purdue_1992, Cellini_2007). The following publications have been ascertained in the context of this evaluation (PMID: 17696873, 11708860, 1349575). Three ClinVar submitters (evaluation after 2014) have cited the variant, and all laboratories classified the variant as pathogenic (n = 2) or likely pathogenic (n = 1). Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 25, 2023

This sequence change replaces glycine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 82 of the AGXT protein (p.Gly82Glu). This variant is present in population databases (rs121908522, gnomAD 0.02%). This missense change has been observed in individual(s) with primary hyperoxaluria (PMID: 1349575). This variant is also known as G367A. ClinVar contains an entry for this variant (Variation ID: 5643). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt AGXT protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects AGXT function (PMID: 10960483, 17696873). This variant disrupts the p.Gly82 amino acid residue in AGXT. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 15253729). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.40
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.95	D
Eigen	Uncertain	0.35
Eigen_PC	Benign	0.12
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.91	D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	1.0	D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Pathogenic	4.2	H
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-7.4	D
REVEL	Pathogenic	0.81
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.98
MutPred		0.99		Loss of glycosylation at S81 (P = 0.0387);
MVP		0.97
MPC		0.27
ClinPred		0.99	D
GERP RS		3.4
Varity_R		0.99
gMVP		0.99

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

LitVar

Other links and lift over

dbSNP: rs121908522; hg19: chr2-241808666;