17-80107817-C-T

Variant names:

• chr17-80107817-C-T
• rs763216519
• NM_000152.5:c.876C>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6 BP7

The NM_000152.5(GAA):​c.876C>T​(p.Tyr292Tyr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000116 in 1,459,568 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). The gene GAA is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: GAA NM_000152.5 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:4
• Conservation: PhyloP100: -2.90
• Publications: 2 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

Specifications for GAA are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).
• BP6: Variant 17-80107817-C-T is Benign according to our data. Variant chr17-80107817-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 255368.
• BP7: Synonymous conserved (PhyloP=-2.89 with no splicing effect.

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.876C>T	p.Tyr292Tyr	synonymous	Exon 5 of 20	NP_000143.2	P10253
	GAA	NM_001079803.3		c.876C>T	p.Tyr292Tyr	synonymous	Exon 6 of 21	NP_001073271.1	P10253
	GAA	NM_001079804.3		c.876C>T	p.Tyr292Tyr	synonymous	Exon 5 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.876C>T	p.Tyr292Tyr	synonymous	Exon 5 of 20	ENSP00000305692.3	P10253
	GAA	ENST00000390015.7	TSL:1	c.876C>T	p.Tyr292Tyr	synonymous	Exon 6 of 21	ENSP00000374665.3	P10253
	GAA	ENST00000933406.1		c.876C>T	p.Tyr292Tyr	synonymous	Exon 5 of 20	ENSP00000603465.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000122 AC: 3 AN: 245364 AF XY: 0.00000749

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000272

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000116 AC: 17 AN: 1459568 Hom.: 0 Cov.: 57 AF XY: 0.0000124 AC XY: 9 AN XY: 726098

African (AFR) AF: 0.00 AC: 0 AN: 33460

American (AMR) AF: 0.00 AC: 0 AN: 44556

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26084

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39658

South Asian (SAS) AF: 0.00 AC: 0 AN: 86144

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52260

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5616

European-Non Finnish (NFE) AF: 0.0000144 AC: 16 AN: 1111542

Other (OTH) AF: 0.00 AC: 0 AN: 60248

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000372 Hom.: 0

Bravo AF: 0.0000151

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	1	not provided (2)
-	-	1	Cardiovascular phenotype (1)
-	-	1	Glycogen storage disease, type II (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	0.57
DANN	Benign	0.62
PhyloP100		-2.9

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs763216519; hg19: chr17-78081616;