NM_000030.3:c.299_307dupTCCTGGTTG

Variant names:

• chr2-240869302-T-TTCCTGGTTG
• rs180177193
• NM_000030.3:c.299_307dupTCCTGGTTG

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM4 PP5_Moderate

The NM_000030.3(AGXT):​c.299_307dupTCCTGGTTG​(p.Val102_Gly103insValLeuVal) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. G103G) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: AGXT NM_000030.3 disruptive_inframe_insertion
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.03
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• alanine glyoxylate aminotransferase deficiency

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• primary hyperoxaluria type 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Myriad Women’s Health, Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet

ENSG00000297735 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_000030.3
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_000030.3.
• PP5: Variant 2-240869302-T-TTCCTGGTTG is Pathogenic according to our data. Variant chr2-240869302-T-TTCCTGGTTG is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 242577.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AGXT	NM_000030.3	c.299_307dupTCCTGGTTG	p.Val102_Gly103insValLeuVal	disruptive_inframe_insertion	Exon 2 of 11	ENST00000307503.4	NP_000021.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AGXT	ENST00000307503.4	c.299_307dupTCCTGGTTG	p.Val102_Gly103insValLeuVal	disruptive_inframe_insertion	Exon 2 of 11	1	NM_000030.3	ENSP00000302620.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary hyperoxaluria, type I Pathogenic:1

Oct 27, 2023

Rare Kidney Stone Consortium and the Mayo Clinic Hyperoxaluria Center, Mayo Clinic

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG:PM2 PM3 PM4 PP4 PP5 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.0
Mutation Taster		=14/86	disease causing

Splicing

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

Other links and lift over

dbSNP: rs180177193; hg19: chr2-241808719;