4-177440352-GCTCT-GCTCTCT

Variant names:

• chr4-177440352-G-GCT
• rs386833420
• NM_000027.4:c.200_201dupAG

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000027.4(AGA):​c.200_201dupAG​(p.Gln68SerfsTer7) variant causes a frameshift 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 (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: AGA NM_000027.4 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.418
• Publications: 0 publications found

Genes affected

AGA (HGNC:318): (aspartylglucosaminidase) This gene encodes a member of the N-terminal nucleophile (Ntn) hydrolase family of proteins. The encoded preproprotein is proteolytically processed to generate alpha and beta chains that comprise the mature enzyme. This enzyme is involved in the catabolism of N-linked oligosaccharides of glycoproteins. It cleaves asparagine from N-acetylglucosamines as one of the final steps in the lysosomal breakdown of glycoproteins. Mutations in this gene are associated with the lysosomal storage disease aspartylglycosaminuria that results in progressive neurodegeneration. Alternative splicing results in multiple transcript variants, at least one of which encodes an isoform that is subject to proteolytic processing. [provided by RefSeq, Nov 2015]

AGA Gene-Disease associations (from GenCC):

• aspartylglucosaminuria

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

ACMG classification

Our verdict: Pathogenic. The variant received 12 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 4-177440352-G-GCT is Pathogenic according to our data. Variant chr4-177440352-G-GCT is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2680811.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AGA	NM_000027.4	c.200_201dupAG	p.Gln68SerfsTer7	frameshift_variant	Exon 2 of 9	ENST00000264595.7	NP_000018.2
AGA	NM_001171988.2	c.200_201dupAG	p.Gln68SerfsTer7	frameshift_variant	Exon 2 of 9		NP_001165459.1
AGA	XM_047449722.1	c.200_201dupAG	p.Gln68SerfsTer7	frameshift_variant	Exon 2 of 7		XP_047305678.1
AGA	NR_033655.2	n.262_263dupAG		non_coding_transcript_exon_variant	Exon 2 of 8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AGA	ENST00000264595.7	c.200_201dupAG	p.Gln68SerfsTer7	frameshift_variant	Exon 2 of 9	1	NM_000027.4	ENSP00000264595.2
AGA	ENST00000506853.5	n.234_235dupAG		non_coding_transcript_exon_variant	Exon 2 of 6	2
AGA	ENST00000510955.5	n.234_235dupAG		non_coding_transcript_exon_variant	Exon 2 of 4	2
AGA	ENST00000511231.1	n.234_235dupAG		non_coding_transcript_exon_variant	Exon 2 of 2	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Aspartylglucosaminuria Pathogenic:1

Oct 25, 2022

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.42

Splicing

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

Other links and lift over

dbSNP: rs386833420; hg19: chr4-178361506;