chr17-80108569-C-T

Variant names:

• chr17-80108569-C-T
• rs786204517
• NM_000152.5:c.1156C>T

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PP4 PM2 PVS1

This summary comes from the ClinGen Evidence Repository: This variant, c.1156C>T (p.Gln386Ter), is a nonsense variant that is predicted to result in nonsense mediated decay and lack of gene product, meeting PVS1. This variant is absent in gnomAD v2.1.1, meeting PM3. A Korean patient with infantile onset Pompe disease, meeting the specifications for PP4, has been reported. This patient is compound heterozygous for the variant and c.1857C>G (p.Ser619Arg). This in trans data has been used in the assessment of p.Ser619Arg and was not be included here to avoid circular logic. There is a ClinVar entry for this variant (Variation ID: 188858; 1 star review status) with one submitter classifying the variant as likely pathogenic. In summary, this variant meets criteria to be classified as pathogenic for Pompe disease. ACMG/AMP criteria met, as specified by the ClinGen LSD VCEP: PVS1, PM2, PP4. LINK:https://erepo.genome.network/evrepo/ui/classification/CA274049/MONDO:0009290/010

• Frequency: Genomes: not found (cov: 33)
• Consequence: GAA NM_000152.5 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 0.213
• Publications: 4 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, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), PanelApp Australia, ClinGen, G2P
• 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 11 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.
• 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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GAA	NM_000152.5	MANE Select	c.1156C>T	p.Gln386*	stop_gained	Exon 7 of 20	NP_000143.2
	GAA	NM_001079803.3		c.1156C>T	p.Gln386*	stop_gained	Exon 8 of 21	NP_001073271.1
	GAA	NM_001079804.3		c.1156C>T	p.Gln386*	stop_gained	Exon 7 of 20	NP_001073272.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GAA	ENST00000302262.8	TSL:1 MANE Select	c.1156C>T	p.Gln386*	stop_gained	Exon 7 of 20	ENSP00000305692.3
	GAA	ENST00000390015.7	TSL:1	c.1156C>T	p.Gln386*	stop_gained	Exon 8 of 21	ENSP00000374665.3
	GAA	ENST00000570803.6	TSL:5	c.1156C>T	p.Gln386*	stop_gained	Exon 7 of 20	ENSP00000460543.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 38

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

Glycogen storage disease, type II Pathogenic:2

Jun 30, 2014

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com.

Apr 06, 2020

ClinGen Lysosomal Storage Disorder Variant Curation Expert Panel

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

This variant, c.1156C>T (p.Gln386Ter), is a nonsense variant that is predicted to result in nonsense mediated decay and lack of gene product, meeting PVS1. This variant is absent in gnomAD v2.1.1, meeting PM3. A Korean patient with infantile onset Pompe disease, meeting the specifications for PP4, has been reported. This patient is compound heterozygous for the variant and c.1857C>G (p.Ser619Arg). This in trans data has been used in the assessment of p.Ser619Arg and was not be included here to avoid circular logic. There is a ClinVar entry for this variant (Variation ID: 188858; 1 star review status) with one submitter classifying the variant as likely pathogenic. In summary, this variant meets criteria to be classified as pathogenic for Pompe disease. ACMG/AMP criteria met, as specified by the ClinGen LSD VCEP: PVS1, PM2, PP4.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	0.70
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Benign	0.74	D
PhyloP100		0.21
Vest4		0.85
GERP RS		3.3
Mutation Taster		=1/199	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs786204517; hg19: chr17-78082368;