rs886043343

Variant names:

• chr17-80118209-CCA-C
• rs886043343
• NM_000152.5:c.2501_2502delCA

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PP4 PM3_Supporting PM2 PVS1

This summary comes from the ClinGen Evidence Repository: This variant, c.2501_2502delCA (p.Thr834Argfs) is predicted to result in a frameshift causing a premature termination codon, nonsense medicated decay, and lack of GAA gene product, meeting PVS1. The variant has a highest population minor allele frequency of 0.00005794 in the Latino population, meeting PM2. This variant was found in compound heterozygosity with a known pathogenic variant, c.-32-13T>G, in three patients, who all meet the ClinGen LSD VCEP's PP4 criterion (PMID 22958975). The phase not confirmed in any of these patients. Additional patients with this variant have been reported but were not included because the residual GAA activity was not provided, and therefore PP4 cannot be assessed (PMIDs 19588081, 29122469), or the in trans data had been counted towards another variant and therefore were not included here to avoid circular logic (c.1933G>A (p.Asp645Asn), (PMID 23601496). The data meet PP4 and PM3_Supporting. There is a ClinVar entry for this variant (Variant ID: 286229; 2 star review status) with three submitters classifying the variant as pathogenic and one as likely pathogenic. In summary, this variant meets the criteria to be classified as pathogenic for Pompe disease. GAA-specific ACMG/AMP criteria applied, as specified by the ClinGen LSD VCEP: PVS1, PM2, PM3_Supporting, PP4. LINK:https://erepo.genome.network/evrepo/ui/classification/CA10605404/MONDO:0009290/010

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: GAA NM_000152.5 frameshift
• Clinical Significance: Pathogenic reviewed by expert panel P:11
• Conservation: PhyloP100: 1.17
• Publications: 7 publications found

Genes affected

GAA (HGNC:4065): (alpha glucosidase) This gene encodes lysosomal alpha-glucosidase, which is essential for the degradation of glycogen to glucose in lysosomes. The encoded preproprotein is proteolytically processed to generate multiple intermediate forms and the mature form of the enzyme. Defects in this gene are the cause of glycogen storage disease II, also known as Pompe's disease, which is an autosomal recessive disorder with a broad clinical spectrum. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

GAA Gene-Disease associations (from GenCC):

• glycogen storage disease II

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, ClinGen, Labcorp Genetics (formerly Invitae), G2P, Laboratory for Molecular Medicine
• glycogen storage disease due to acid maltase deficiency, infantile onset

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• glycogen storage disease due to acid maltase deficiency, late-onset

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM3: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000152.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GAA	NM_000152.5	MANE Select	c.2501_2502delCA	p.Thr834ArgfsTer49	frameshift	Exon 18 of 20	NP_000143.2	P10253
	GAA	NM_001079803.3		c.2501_2502delCA	p.Thr834ArgfsTer49	frameshift	Exon 19 of 21	NP_001073271.1	P10253
	GAA	NM_001079804.3		c.2501_2502delCA	p.Thr834ArgfsTer49	frameshift	Exon 18 of 20	NP_001073272.1	P10253

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GAA	ENST00000302262.8	TSL:1 MANE Select	c.2501_2502delCA	p.Thr834ArgfsTer49	frameshift	Exon 18 of 20	ENSP00000305692.3	P10253
	GAA	ENST00000390015.7	TSL:1	c.2501_2502delCA	p.Thr834ArgfsTer49	frameshift	Exon 19 of 21	ENSP00000374665.3	P10253
	GAA	ENST00000933406.1		c.2516_2517delCA	p.Thr839ArgfsTer49	frameshift	Exon 18 of 20	ENSP00000603465.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000799 AC: 2 AN: 250190 AF XY: 0.00000738

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS 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: 1460844 Hom.: 0 AF XY: 0.00000138 AC XY: 1 AN XY: 726688

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.0000448 AC: 2 AN: 44674

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86192

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52724

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5750

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111848

Other (OTH) AF: 0.00 AC: 0 AN: 60366

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
8	-	-	Glycogen storage disease, type II (8)
3	-	-	not provided (3)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.2
Mutation Taster		=3/197	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs886043343; hg19: chr17-78092008;