rs202064115

Variant names:

• chr17-80110771-A-G
• rs202064115
• NM_000152.5:c.1482A>G

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Strong BP6 BP7

The NM_000152.5(GAA):​c.1482A>G​(p.Thr494Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000725 in 1,613,948 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).

• Frequency:
  • Genomes: 𝑓 0.000085 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000071 (0 hom.)
• Consequence: GAA NM_000152.5 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:8
• Conservation: PhyloP100: 0.858
• Publications: 5 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: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 17-80110771-A-G is Benign according to our data. Variant chr17-80110771-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 286163.
• BP7: Synonymous conserved (PhyloP=0.858 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.1482A>G	p.Thr494Thr	synonymous	Exon 10 of 20	NP_000143.2
	GAA	NM_001079803.3		c.1482A>G	p.Thr494Thr	synonymous	Exon 11 of 21	NP_001073271.1
	GAA	NM_001079804.3		c.1482A>G	p.Thr494Thr	synonymous	Exon 10 of 20	NP_001073272.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GAA	ENST00000302262.8	TSL:1 MANE Select	c.1482A>G	p.Thr494Thr	synonymous	Exon 10 of 20	ENSP00000305692.3
	GAA	ENST00000390015.7	TSL:1	c.1482A>G	p.Thr494Thr	synonymous	Exon 11 of 21	ENSP00000374665.3
	GAA	ENST00000933406.1		c.1497A>G	p.Thr499Thr	synonymous	Exon 10 of 20	ENSP00000603465.1

Frequencies

GnomAD3 genomes AF: 0.0000855 AC: 13 AN: 152110 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000191

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000796 AC: 20 AN: 251214 AF XY: 0.0000662

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000114

Gnomad OTH exome AF: 0.000489

GnomAD4 exome AF: 0.0000711 AC: 104 AN: 1461838 Hom.: 0 Cov.: 37 AF XY: 0.0000646 AC XY: 47 AN XY: 727228

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.000224 AC: 10 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53376

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.0000809 AC: 90 AN: 1112002

Other (OTH) AF: 0.0000497 AC: 3 AN: 60396

GnomAD4 genome AF: 0.0000855 AC: 13 AN: 152110 Hom.: 0 Cov.: 33 AF XY: 0.0000673 AC XY: 5 AN XY: 74286

African (AFR) AF: 0.00 AC: 0 AN: 41424

American (AMR) AF: 0.00 AC: 0 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10614

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000191 AC: 13 AN: 68008

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.000197 Hom.: 0

Bravo AF: 0.0000869

EpiCase AF: 0.000273

EpiControl AF: 0.000237

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	4	Glycogen storage disease, type II (4)
-	1	1	not provided (2)
-	-	1	Cardiovascular phenotype (1)
-	-	1	GAA-related disorder (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	4.6
DANN	Benign	0.29
PhyloP100		0.86
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs202064115; hg19: chr17-78084570;