rs111261964
Variant summary
Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS1
This summary comes from the ClinGen Evidence Repository: The NM_000152.5:c.1552-13G>A variant is located near the acceptor splice region of intron 10 of GAA. The computational splicing predictor SpliceAI predicts that the variant has no impact on splicing (BP4). To our knowledge, functional studies investigating the impact of this variant on splicing are not available. The highest population minor allele frequency in gnomAD v2.1.1 is 0.004705 (607/129008 alleles) in the European non-Finnish population, which meets the ClinGen LSD VCEP’s threshold for BS1 (>0.005) when rounded up (BS1). There are 2 homozygotes in gnomAD v2.1.1. The variant was reported in a patient with Pompe disease along with a variant that has been classified as pathogenic by the ClinGen LD VCEP (c.841C>T (p.Arg281Trp); the phase was not reported in that patient (PMID:31086307). However, analysis of clinical laboratory data in multiple patients with these two variants indicates that they likely occur in cis. There is a ClinVar entry for this variant (Variation ID: 255353). In summary, this variant meets the criteria to be classified as likely benign for Pompe disease. GAA-specific ACMG/AMP criteria met, as specified by the ClinGen Lysosomal Diseases Variant Curation Expert Panel (Specifications Version 2.0): BS1, BP4.Classification approved by the ClinGen Lysosomal Diseases Variant Curation Expert Panel, April 18th, 2023). LINK:https://erepo.genome.network/evrepo/ui/classification/CA8815382/MONDO:0009290/010
Frequency
Consequence
NM_000152.5 intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -5 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes AF: 0.00269 AC: 410AN: 152162Hom.: 1 Cov.: 33
GnomAD3 exomes AF: 0.00278 AC: 698AN: 251278Hom.: 2 AF XY: 0.00280 AC XY: 381AN XY: 135866
GnomAD4 exome AF: 0.00443 AC: 6474AN: 1461588Hom.: 19 Cov.: 36 AF XY: 0.00439 AC XY: 3189AN XY: 727092
GnomAD4 genome AF: 0.00267 AC: 407AN: 152280Hom.: 1 Cov.: 33 AF XY: 0.00246 AC XY: 183AN XY: 74444
ClinVar
Submissions by phenotype
Glycogen storage disease, type II Uncertain:1Benign:4
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The c.1552-13G>A variant in GAA has not been previously reported in individuals with Glycogen Storage Disease II but has been reported as a likely benign variant (by GeneDx, EGL, and Prevention Genetics) and as a VUS (by Illumina) in ClinVar (Variation ID: 255353). This variant has been identified in 0.4705% (607/129008) of European (non-Finnish) chromosomes, including 2 homozygotes, by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs111261964). Although this variant has been seen in the general population, its frequency is not high enough to rule out a pathogenic role. Computational 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 (PMID: 25741868). 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). -
The NM_000152.5:c.1552-13G>A variant is located near the acceptor splice region of intron 10 of GAA. The computational splicing predictor SpliceAI predicts that the variant has no impact on splicing (BP4). To our knowledge, functional studies investigating the impact of this variant on splicing are not available. The highest population minor allele frequency in gnomAD v2.1.1 is 0.004705 (607/129008 alleles) in the European non-Finnish population, which meets the ClinGen LSD VCEP’s threshold for BS1 (>0.005) when rounded up (BS1). There are 2 homozygotes in gnomAD v2.1.1. The variant was reported in a patient with Pompe disease along with a variant that has been classified as pathogenic by the ClinGen LD VCEP (c.841C>T (p.Arg281Trp); the phase was not reported in that patient (PMID: 31086307). However, analysis of clinical laboratory data in multiple patients with these two variants indicates that they likely occur in cis. There is a ClinVar entry for this variant (Variation ID: 255353). In summary, this variant meets the criteria to be classified as likely benign for Pompe disease. GAA-specific ACMG/AMP criteria met, as specified by the ClinGen Lysosomal Diseases Variant Curation Expert Panel (Specifications Version 2.0): BS1, BP4. Classification approved by the ClinGen Lysosomal Diseases Variant Curation Expert Panel, April 18th, 2023). -
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. -
not provided Uncertain:1Benign:3
GAA: BS2 -
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See Variant Classification Assertion Criteria. -
not specified Benign:4
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Variant summary: The GAA c.1552-13G>A variant involves the alteration of a non-conserved intronic nucleotide. One in silico tool predicts a benign outcome for this variant. 5/5 splice prediction tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. This variant was found in 788/277130 control chromosomes (2 homozygotes), predominantly observed in the European (Non-Finnish) subpopulation at a frequency of 0.004675 (592/126628)(gnomAD). This frequency is slightly above the estimated maximal expected allele frequency of a pathogenic GAA variant (0.0042205), suggesting this is likely a benign polymorphism found primarily in the populations of European (Non-Finnish) origin. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as likely benign and one other lab classified it as VUS. Taken together, this variant is classified as likely benign. -
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at