rs180177255

Variant names:

• chr2-240874060-CAAGT-C
• rs180177255
• NM_000030.3:c.679_680+2delAAGT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000030.3(AGXT):​c.679_680+2delAAGT​(p.Lys228ArgfsTer45) variant causes a frameshift, splice donor, splice region, intron change. The variant allele was found at a frequency of 0.00000205 in 1,461,118 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: AGXT NM_000030.3 frameshift, splice_donor, splice_region, intron
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 7.08

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-240874060-CAAGT-C is Pathogenic according to our data. Variant chr2-240874060-CAAGT-C is described in ClinVar as [Pathogenic]. Clinvar id is 204195.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AGXT	NM_000030.3	c.679_680+2delAAGT	p.Lys228ArgfsTer45	frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant	Exon 6 of 11	ENST00000307503.4	NP_000021.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AGXT	ENST00000307503.4	c.679_680+2delAAGT	p.Lys228ArgfsTer45	frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant	Exon 6 of 11	1	NM_000030.3	ENSP00000302620.3
AGXT	ENST00000476698.1	n.332+1012_332+1015delAAGT		intron_variant	Intron 2 of 3	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000120 AC: 3 AN: 250856 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135676

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000163

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461118 Hom.: 0 AF XY: 0.00000138 AC XY: 1 AN XY: 726872

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000756

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: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Primary hyperoxaluria, type I Pathogenic:4

May 16, 2022

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 26, 2024

Chinese Inherited Urolithiasis Consortium, The Affiliated Yantai Yuhuangding Hospital of Qingdao University

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

Variant_type:truncating/MutationTaster:NONE/CADD:NONE/phyloP:NONE/phastCons:NONE/gnomAD_exome_EastAsian:NONE/ExAC_EastAsian:NONE/dbSNP:NONE -

Nov 27, 2014

Clinical Biochemistry Laboratory, Health Services Laboratory

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Sep 06, 2021

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Pathogenic:1

Sep 25, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 204195). This variant is also known as 679-(IVS6+2)delAAgt . This variant has been observed in individual(s) with hyperoxaluria (PMID: 11708860). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is present in population databases (rs180177255, gnomAD 0.02%). This variant results in the deletion of part of exon 6 (c.679_680+2del) of the AGXT gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in AGXT are known to be pathogenic (PMID: 19479957). -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.99		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.99		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs180177255; hg19: chr2-241813477;