17-80104166-AAGTGGGAGGATTGCTTGAGTCTGGGAGGTGGAGGTTGCAGTGAGCCAGGATCTCACCACAGCACTCTGGCCCAGGCGACAGCTGTTTGGCCTGTTTCAAGTGTCTACCTGCCTTGCTGGTCTTCCTGGGGACATTCTAAGCGTGTTTGATTTGTAACATTTTAGCAGACTGTGCAAGTGCTCTGCACTCCCCTGCTGGAGCTTTTCTCGCCCTTCCTTCTGGCCCTCTCCCCAGTCTAGACAGCAGGGCAACACCCACCCTGGCCACCTTACCCCACCTGCCTGGGTGCTGCAGTGCCAGCCGCGGTTGATGTCTCAGAGCTGCTTTGAGAGCCCCGTGAGTGCCGCCCCTCCCGCCTCCCTGCTGAGCCCGCTTTCTTCTCCCGCAGGCCTGTAGGAGCTGTCCAGGCCATCTCCAACCATGGGAGTGAGGCACCCGCCCTGCTCCCACCGGCTCCTGGCCGTCTGCGCCCTCGTGTCCTTGGCAACCGCTGCACTCCTGGGGCACATCCTACTCCATGATTTCCTGCTGGTTCCCCGAGAGCTGAGTGGCTCCTCCCC-A

Position:

• chr17-80104166-AAGTGGGAGGATTGCTTGAGTCTGGGAGGTGGAGGTTGCAGTGAGCCAGGATCTCACCACAGCACTCTGGCCCAGGCGACAGCTGTTTGGCCTGTTTCAAGTGTCTACCTGCCTTGCTGGTCTTCCTGGGGACATTCTAAGCGTGTTTGATTTGTAACATTTTAGCAGACTGTGCAAGTGCTCTGCACTCCCCTGCTGGAGCTTTTCTCGCCCTTCCTTCTGGCCCTCTCCCCAGTCTAGACAGCAGGGCAACACCCACCCTGGCCACCTTACCCCACCTGCCTGGGTGCTGCAGTGCCAGCCGCGGTTGATGTCTCAGAGCTGCTTTGAGAGCCCCGTGAGTGCCGCCCCTCCCGCCTCCCTGCTGAGCCCGCTTTCTTCTCCCGCAGGCCTGTAGGAGCTGTCCAGGCCATCTCCAACCATGGGAGTGAGGCACCCGCCCTGCTCCCACCGGCTCCTGGCCGTCTGCGCCCTCGTGTCCTTGGCAACCGCTGCACTCCTGGGGCACATCCTACTCCATGATTTCCTGCTGGTTCCCCGAGAGCTGAGTGGCTCCTCCCC-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000152.5(GAA):​c.-32-385_143del variant causes a splice acceptor, 5 prime UTR truncation, exon loss, splice region, intron 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 Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GAA NM_000152.5 splice_acceptor, 5_prime_UTR_truncation, exon_loss, splice_region, intron
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.50

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-80104166-AAGTGGGAGGATTGCTTGAGTCTGGGAGGTGGAGGTTGCAGTGAGCCAGGATCTCACCACAGCACTCTGGCCCAGGCGACAGCTGTTTGGCCTGTTTCAAGTGTCTACCTGCCTTGCTGGTCTTCCTGGGGACATTCTAAGCGTGTTTGATTTGTAACATTTTAGCAGACTGTGCAAGTGCTCTGCACTCCCCTGCTGGAGCTTTTCTCGCCCTTCCTTCTGGCCCTCTCCCCAGTCTAGACAGCAGGGCAACACCCACCCTGGCCACCTTACCCCACCTGCCTGGGTGCTGCAGTGCCAGCCGCGGTTGATGTCTCAGAGCTGCTTTGAGAGCCCCGTGAGTGCCGCCCCTCCCGCCTCCCTGCTGAGCCCGCTTTCTTCTCCCGCAGGCCTGTAGGAGCTGTCCAGGCCATCTCCAACCATGGGAGTGAGGCACCCGCCCTGCTCCCACCGGCTCCTGGCCGTCTGCGCCCTCGTGTCCTTGGCAACCGCTGCACTCCTGGGGCACATCCTACTCCATGATTTCCTGCTGGTTCCCCGAGAGCTGAGTGGCTCCTCCCC-A is Pathogenic according to our data. Variant chr17-80104166-AAGTGGGAGGATTGCTTGAGTCTGGGAGGTGGAGGTTGCAGTGAGCCAGGATCTCACCACAGCACTCTGGCCCAGGCGACAGCTGTTTGGCCTGTTTCAAGTGTCTACCTGCCTTGCTGGTCTTCCTGGGGACATTCTAAGCGTGTTTGATTTGTAACATTTTAGCAGACTGTGCAAGTGCTCTGCACTCCCCTGCTGGAGCTTTTCTCGCCCTTCCTTCTGGCCCTCTCCCCAGTCTAGACAGCAGGGCAACACCCACCCTGGCCACCTTACCCCACCTGCCTGGGTGCTGCAGTGCCAGCCGCGGTTGATGTCTCAGAGCTGCTTTGAGAGCCCCGTGAGTGCCGCCCCTCCCGCCTCCCTGCTGAGCCCGCTTTCTTCTCCCGCAGGCCTGTAGGAGCTGTCCAGGCCATCTCCAACCATGGGAGTGAGGCACCCGCCCTGCTCCCACCGGCTCCTGGCCGTCTGCGCCCTCGTGTCCTTGGCAACCGCTGCACTCCTGGGGCACATCCTACTCCATGATTTCCTGCTGGTTCCCCGAGAGCTGAGTGGCTCCTCCCC-A is described in ClinVar as [Pathogenic]. Clinvar id is 2745468.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GAA	NM_000152.5	c.-32-385_143del	p.Met1fs	frameshift_variant, start_lost, splice_region_variant	2/20	ENST00000302262.8	NP_000143.2
GAA	NM_000152.5	c.-32-385_143del		splice_acceptor_variant, 5_prime_UTR_truncation, exon_loss_variant, splice_region_variant, intron_variant	2/20	ENST00000302262.8	NP_000143.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GAA	ENST00000302262.8	c.-32-388_140del	p.Met1fs	frameshift_variant, start_lost, splice_region_variant	2/20	1	NM_000152.5	ENSP00000305692.3
GAA	ENST00000302262	c.-32-388_140del		splice_acceptor_variant, 5_prime_UTR_truncation, exon_loss_variant, splice_region_variant, intron_variant	2/20	1	NM_000152.5	ENSP00000305692.3

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Glycogen storage disease, type II Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 19, 2023

For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the GAA protein in which other variant(s) (p.Met1?) have been determined to be pathogenic (PMID: 18425781, 22252923, 29124014, 29422078, 31086307). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. This variant has not been reported in the literature in individuals affected with GAA-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the GAA mRNA. The next in-frame methionine is located at codon 122. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-78077965;