NM_000152.5(GAA):c.955+14C>A AND Glycogen storage disease, type II

Germline classification:: Conflicting interpretations of pathogenicity (3 submissions)
Last evaluated:: Jan 21, 2024
Review status:: criteria provided, conflicting classifications

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000346137.16

Allele description [Variation Report for NM_000152.5(GAA):c.955+14C>A]

NM_000152.5(GAA):c.955+14C>A

Gene:

GAA:alpha glucosidase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

17q25.3

Genomic location:

Preferred name:

NM_000152.5(GAA):c.955+14C>A

HGVS:

NC_000017.11:g.80107910C>A
NG_009822.1:g.11355C>A
NM_000152.5:c.955+14C>AMANE SELECT
NM_001079803.3:c.955+14C>A
NM_001079804.3:c.955+14C>A
LRG_673t1:c.955+14C>A
LRG_673:g.11355C>A
NC_000017.10:g.78081709C>A
NC_000017.10:g.78081709C>A
NM_000152.3:c.955+14C>A
NM_000152.4(GAA):c.955+14C>A

Links:

dbSNP: rs756921041

NCBI 1000 Genomes Browser:

rs756921041

Molecular consequence:

NM_000152.5:c.955+14C>A - intron variant - [Sequence Ontology: SO:0001627]
NM_001079803.3:c.955+14C>A - intron variant - [Sequence Ontology: SO:0001627]
NM_001079804.3:c.955+14C>A - intron variant - [Sequence Ontology: SO:0001627]

Condition(s)

Name:: Glycogen storage disease, type II (GSD2)
Synonyms:: ACID ALPHA-GLUCOSIDASE DEFICIENCY; GLYCOGENOSIS, GENERALIZED, CARDIAC FORM; GSD II; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0009290; MedGen: C0017921; Orphanet: 365; OMIM: 232300

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000407275	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Uncertain significance (Jan 12, 2018)	germline	clinical testing	Citation Link,
SCV001423121	Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard	criteria provided, single submitter (ACMG Guidelines, 2015)	Likely benign (Jan 22, 2020)	germline	curation	PubMed (1) [See all records that cite this PMID] Citation Link,
SCV002419399	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Likely benign (Jan 21, 2024)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000407275

Illumina Laboratory Services, Illumina

criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)

Uncertain significance
(Jan 12, 2018)

germline

clinical testing

Citation Link,

SCV001423121

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

criteria provided, single submitter

(ACMG Guidelines, 2015)

Likely benign
(Jan 22, 2020)

germline

curation

PubMed (1)
[See all records that cite this PMID]

Citation Link,

SCV002419399

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Likely benign
(Jan 21, 2024)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing, curation

Citations

PubMed

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee..

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Illumina Laboratory Services, Illumina, SCV000407275.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard, SCV001423121.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	curation	PubMed (1)

Description

The c.955+14C>A variant in GAA has not been previously reported in individuals with Glycogen Storage Disease II but has been identified in 0.254% (24/9456) of Ashkenazi Jewish chromosomes and 0.005% (1/19214) of African chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs756921041). Although this variant has been seen in the general population, its frequency is not high enough to rule out a pathogenic role. This variant has also been reported as a VUS by Illumina and a likely benign variant by GeneDx in ClinVar (Variation ID: 325784). This variant is located in the 5' splice region. Computational splice prediction tools and conservation analyses suggest that this variant may not impact the protein, though this information is not predictive enough to rule out pathogenicity. However, novel synonymous variants supported by computational evidence without raised suspicion for an impact are likely benign (Richards 2015). In summary, although additional studies are required to fully establish its clinical significance, this variant is likely benign. ACMG/AMP Criteria applied: BP4, BP7 (Richards 2015).

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Labcorp Genetics (formerly Invitae), Labcorp, SCV002419399.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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