chr17-80110027-A-C

Position:

chr17-80110027-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 1P and 1B. PM2_SupportingBP4

This summary comes from the ClinGen Evidence Repository: The NM_000152.5:c.1409A>C variant in GAA is a missense variant predicted to cause substitution of Asn by Thr at amino acid 470 (p.Asn470Thr). The highest population minor allele frequency in gnomAD v4.0.0 is 0.0001068 (8/74918 alleles) in the African population, which is lower than the ClinGen Lysosomal Diseases VCEP’s threshold for PM2_Supporting (<0.001), meeting this criterion (PM2_Supporting). The computational predictor REVEL gives a score of 0.468 which is below the threshold of 0.5, evidence that does not predict a damaging effect on GAA function (BP4). It has been reported in two cases identified as affected by newborn screening (PMID 23430949, 37087815). There is insufficient data to apply PP4. There is a ClinVar entry for this variant (Variation ID: 526525, 2 star review status) with 3 submitters classifying the variant as Uncertain significance. In summary, this variant meets the criteria to be classified as Uncertain significance for Pompe disease based on the ACMG/AMP criteria applied, as specified by the ClinGen Lysosomal Diseases Variant Curation Expert panel (specifications Version 2.0): PM2_supporting.(Classification approved by the ClinGen Lysosomal Diseases Variant Curation Expert Panel on December 19, 2023). LINK:https://erepo.genome.network/evrepo/ui/classification/CA8815309/MONDO:0009290/010

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

GAA
NM_000152.5 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel P:1U:4

Conservation

PhyloP100: 6.91

Variant links:

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 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

BP4

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GAA	NM_000152.5 linkuse as main transcript	c.1409A>C	p.Asn470Thr	missense_variant	9/20	ENST00000302262.8	NP_000143.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GAA	ENST00000302262.8 linkuse as main transcript	c.1409A>C	p.Asn470Thr	missense_variant	9/20	1	NM_000152.5	ENSP00000305692	P1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000240

AC:

AN:

249584

Hom.:

AF XY:

0.0000222

AC XY:

AN XY:

135436

show subpopulations

Gnomad AFR exome

AF:

0.0000630

Gnomad AMR exome

AF:

0.0000869

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000178

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000123

AC:

AN:

1460852

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

726766

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000989

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152168

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74344

show subpopulations

Gnomad4 AFR

AF:

0.000145

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000387

Hom.:

Bravo

AF:

0.0000567

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Glycogen storage disease, type II

Pathogenic:1Uncertain:3

Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 20, 2023	- -
Uncertain significance, reviewed by expert panel	curation	ClinGen Lysosomal Storage Disorder Variant Curation Expert Panel	Dec 19, 2023	The NM_000152.5:c.1409A>C variant in GAA is a missense variant predicted to cause substitution of Asn by Thr at amino acid 470 (p.Asn470Thr). The highest population minor allele frequency in gnomAD v4.0.0 is 0.0001068 (8/74918 alleles) in the African population, which is lower than the ClinGen Lysosomal Diseases VCEP’s threshold for PM2_Supporting (<0.001), meeting this criterion (PM2_Supporting). The computational predictor REVEL gives a score of 0.468 which is below the threshold of 0.5, evidence that does not predict a damaging effect on GAA function (BP4). It has been reported in two cases identified as affected by newborn screening (PMID 23430949, 37087815). There is insufficient data to apply PP4. There is a ClinVar entry for this variant (Variation ID: 526525, 2 star review status) with 3 submitters classifying the variant as Uncertain significance. In summary, this variant meets the criteria to be classified as Uncertain significance for Pompe disease based on the ACMG/AMP criteria applied, as specified by the ClinGen Lysosomal Diseases Variant Curation Expert panel (specifications Version 2.0): PM2_supporting. (Classification approved by the ClinGen Lysosomal Diseases Variant Curation Expert Panel on December 19, 2023). -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 01, 2022	This sequence change replaces asparagine, which is neutral and polar, with threonine, which is neutral and polar, at codon 470 of the GAA protein (p.Asn470Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individual(s) with Pompe disease (PMID: 23430949). ClinVar contains an entry for this variant (Variation ID: 526525). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt GAA protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Sep 13, 2021	- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Oct 26, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Benign

-0.062

BayesDel_noAF

Benign

-0.14

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.86

D;D

Eigen

Uncertain

0.23

Eigen_PC

Uncertain

0.26

FATHMM_MKL

Uncertain

0.96

LIST_S2

Benign

0.77

.;T

M_CAP

Pathogenic

0.33

MetaRNN

Pathogenic

0.86

D;D

MetaSVM

Uncertain

0.25

MutationAssessor

Benign

0.88

L;L

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.54

PROVEAN

Uncertain

-3.2

D;D

REVEL

Uncertain

0.47

Sift

Benign

0.094

T;T

Sift4G

Uncertain

0.042

D;D

Polyphen

0.89

P;P

Vest4

0.74

MVP

1.0

MPC

0.34

ClinPred

0.48

GERP RS

5.4

Varity_R

0.38

gMVP

0.83

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over