NM_000152.5:c.503G>C

Variant names:

• chr17-80105089-G-C
• rs376685205
• NM_000152.5:c.503G>C

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_000152.5(GAA):​c.503G>C​(p.Arg168Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R168Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GAA NM_000152.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: -0.264
• Publications: 24 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: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 201 curated pathogenic missense variants (we use a threshold of 10). The gene has 50 curated benign missense variants. Gene score misZ: -0.63308 (below the threshold of 3.09). Trascript score misZ: -0.32889 (below the threshold of 3.09). GenCC associations: The gene is linked to glycogen storage disease due to acid maltase deficiency, infantile onset, glycogen storage disease II, glycogen storage disease due to acid maltase deficiency, late-onset.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.844

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.503G>C	p.Arg168Pro	missense	Exon 2 of 20	NP_000143.2	P10253
	GAA	NM_001079803.3		c.503G>C	p.Arg168Pro	missense	Exon 3 of 21	NP_001073271.1	P10253
	GAA	NM_001079804.3		c.503G>C	p.Arg168Pro	missense	Exon 2 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.503G>C	p.Arg168Pro	missense	Exon 2 of 20	ENSP00000305692.3	P10253
	GAA	ENST00000390015.7	TSL:1	c.503G>C	p.Arg168Pro	missense	Exon 3 of 21	ENSP00000374665.3	P10253
	GAA	ENST00000933406.1		c.503G>C	p.Arg168Pro	missense	Exon 2 of 20	ENSP00000603465.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

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

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.63
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Benign	15
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.54	D
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.36
FATHMM_MKL	Benign	0.36	N
LIST_S2	Benign	0.83	T
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.84	D
MetaSVM	Uncertain	-0.097	T
MutationAssessor	Pathogenic	3.2	M
PhyloP100		-0.26
PrimateAI	Benign	0.19	T
PROVEAN	Uncertain	-3.0	D
REVEL	Pathogenic	0.86
Sift	Benign	0.046	D
Sift4G	Uncertain	0.035	D
Polyphen		0.80	P
Vest4		0.62
MutPred		0.68		Loss of catalytic residue at R168 (P = 0.0598)
MVP		0.96
MPC		0.39
ClinPred		0.93	D
GERP RS		-0.81
Varity_R		0.96
gMVP		0.87
Mutation Taster		=15/85	disease causing

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: rs376685205; hg19: chr17-78078888;