rs764318570
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000642.3(AGL):c.3554del(p.Thr1185LysfsTer42) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000558 in 1,613,674 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)
Exomes 𝑓: 0.0000055 ( 0 hom. )
Consequence
AGL
NM_000642.3 frameshift
NM_000642.3 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 1.24
Genes affected
AGL (HGNC:321): (amylo-alpha-1, 6-glucosidase, 4-alpha-glucanotransferase) This gene encodes the glycogen debrancher enzyme which is involved in glycogen degradation. This enzyme has two independent catalytic activities which occur at different sites on the protein: a 4-alpha-glucotransferase activity and a amylo-1,6-glucosidase activity. Mutations in this gene are associated with glycogen storage disease although a wide range of enzymatic and clinical variability occurs which may be due to tissue-specific alternative splicing. Alternatively spliced transcripts encoding different isoforms have been described. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
?
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
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Very rare variant in population databases, with high coverage;
PP5
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Variant 1-99900826-AC-A is Pathogenic according to our data. Variant chr1-99900826-AC-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 370894.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
AGL | NM_000642.3 | c.3554del | p.Thr1185LysfsTer42 | frameshift_variant | 26/34 | ENST00000361915.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
AGL | ENST00000361915.8 | c.3554del | p.Thr1185LysfsTer42 | frameshift_variant | 26/34 | 1 | NM_000642.3 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00000658 AC: 1AN: 152052Hom.: 0 Cov.: 32
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GnomAD4 exome AF: 0.00000547 AC: 8AN: 1461622Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2AN XY: 727160
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ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Glycogen storage disease type III Pathogenic:4
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Apr 06, 2022 | Variant summary: AGL c.3554delC (p.Thr1185LysfsX42) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 251464 control chromosomes (gnomAD). c.3554delC has been reported in the literature in individuals affected with Glycogen Storage Disease Type III (Goldstein_2010, Sentner_2016, Decostre_2016), including one verified occurrence in trans with a pathogenic nonsense variant (Decostre_2016). These data indicate that the variant is likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three ClinVar submitters have assessed the variant since 2014: one classified the variant as likely pathogenic and two as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Sep 17, 2023 | For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 370894). This premature translational stop signal has been observed in individual(s) with AGL-related conditions (PMID: 20648714). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Thr1185Lysfs*42) in the AGL gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in AGL are known to be pathogenic (PMID: 19299494). - |
Pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Jul 15, 2021 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Counsyl | May 11, 2016 | - - |
Computational scores
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at