17-80118674-G-A

Position:

• chr17-80118674-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000302262.8(GAA):​c.2668G>A​(p.Val890Ile) 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 benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V890L) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GAA ENST00000302262.8 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0280

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06941587).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GAA	NM_000152.5	c.2668G>A	p.Val890Ile	missense_variant	19/20	ENST00000302262.8	NP_000143.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GAA	ENST00000302262.8	c.2668G>A	p.Val890Ile	missense_variant	19/20	1	NM_000152.5	ENSP00000305692	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Benign	13
DANN	Benign	0.89
DEOGEN2	Benign	0.23	T;T
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.089	N
LIST_S2	Benign	0.66	.;T
M_CAP	Benign	0.047	D
MetaRNN	Benign	0.069	T;T
MetaSVM	Benign	-0.69	T
MutationAssessor	Benign	1.6	L;L
MutationTaster	Benign	0.90	N;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	0.23	N;N
REVEL	Benign	0.16
Sift	Benign	0.77	T;T
Sift4G	Benign	0.78	T;T
Polyphen		0.0010	B;B
Vest4		0.036
MutPred		0.28		Gain of sheet (P = 0.1208);Gain of sheet (P = 0.1208);
MVP		0.63
MPC		0.089
ClinPred		0.070	T
GERP RS		3.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.058
gMVP		0.51

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs377286472; hg19: chr17-78092473;