rs879253985
Variant summary
Our verdict is Uncertain significance. Variant got 2 ACMG points: 6P and 4B. PVS1_StrongPM2BS2
The NM_000038.6(APC):βc.8441_8444delβ(p.Lys2814SerfsTer26) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000345 in 1,450,384 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (β β ). Synonymous variant affecting the same amino acid position (i.e. T2813T) has been classified as Likely benign.
Frequency
Consequence
NM_000038.6 frameshift
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 2 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
APC | NM_000038.6 | c.8441_8444del | p.Lys2814SerfsTer26 | frameshift_variant | 16/16 | ENST00000257430.9 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
APC | ENST00000257430.9 | c.8441_8444del | p.Lys2814SerfsTer26 | frameshift_variant | 16/16 | 5 | NM_000038.6 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 exomes AF: 0.00000841 AC: 2AN: 237876Hom.: 0 AF XY: 0.0000156 AC XY: 2AN XY: 128428
GnomAD4 exome AF: 0.00000345 AC: 5AN: 1450384Hom.: 0 AF XY: 0.00000693 AC XY: 5AN XY: 721204
GnomAD4 genome ? Cov.: 32
ClinVar
Submissions by phenotype
Familial adenomatous polyposis 1 Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Baylor Genetics | Jun 07, 2023 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jul 16, 2023 | This sequence change creates a premature translational stop signal (p.Lys2814Serfs*26) in the APC gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 30 amino acid(s) of the APC protein. This variant is present in population databases (rs765424268, gnomAD 0.0009%). This premature translational stop signal has been observed in individual(s) with biliary cancer (PMID: 26556299). ClinVar contains an entry for this variant (Variation ID: 245889). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. - |
not provided Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Jul 08, 2019 | Not observed in large population cohorts (Lek 2016); Frameshift variant predicted to result in protein truncation as the last 30 amino acids are lost and replaced with 25 incorrect amino acids, although loss-of-function variants have not been reported downstream of this position in the protein; Has not been previously published as pathogenic or benign to our knowledge; Disrupts a critical functional domain: hDLG binding domain (Azzopardi 2008); This variant is associated with the following publications: (PMID: 26556299) - |
Uncertain significance, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Apr 25, 2016 | Variant summary: The c.8441_8444delAGAA (p.Lys2814Serfs) variant results in a premature termination codon, predicted to cause a truncated protein, which is a commonly known mechanism for disease. However, the variant affects an amino acid that is located 29 amino acids from the end of the protein coding region of the gene, and creates a premature termination 26 amino acids downstream, therefore the effect of this variant may be reduced considering its location. The variant was observed in the large and broad cohorts of the ExAC project at an allele frequency of 0.0008% which does not exceed the maximal expected allele frequency for a pathogenic variant in APC (0.006%). The variant of interest has not, to our knowledge, been reported in affected individuals via publications and/or reputable databases/clinical laboratories; nor evaluated for functional impact by in vivo/vitro studies. Because of the absence of clinical information and the lack of functional studies, the variant was classified as a variant of uncertain significance (VUS) until additional information becomes available. - |
Hereditary cancer-predisposing syndrome Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | May 26, 2020 | This variant deletes 4 nucleotides in exon 16 of the APC gene, creating a frameshift and premature translation stop signal in the last coding exon. This mutant transcript is predicted to escape nonsense-mediated decay and be expressed as a truncated protein. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with biliary cancer (PMID: 26556299). This variant has also been identified in 2/237876 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this C-terminal truncation variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Jan 22, 2024 | The c.8441_8444delAGAA variant, located in coding exon 15 of the APC gene, results from a deletion of 4 nucleotides at nucleotide positions 8441 to 8444, causing a translational frameshift with a predicted alternate stop codon (p.K2814Sfs*26). This alteration, designated c.8439_8442delAAAG, has been previously identified in the germline and tumor of an individual with biliary carcinoma, but polyp history was not provided (Schrader KA et al. JAMA Oncol. 2016 Jan;2(1):104-11). Frameshifts are typically deleterious in nature, however, this frameshift occurs at the 3' terminus of APC and impacts only the last 30 amino acids of the protein. The exact functional impact of these altered amino acids is unknown at this time. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Classic or attenuated familial adenomatous polyposis Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | Sep 05, 2023 | This variant deletes 4 nucleotides in exon 16 of the APC gene, creating a frameshift and premature translation stop signal in the last coding exon. This mutant transcript is predicted to escape nonsense-mediated decay and be expressed as a truncated protein. To our knowledge, functional studies have not been reported for this variant. This variant has been reported in an individual affected with biliary cancer (PMID: 26556299). This variant has also been identified in 2/237876 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this C-terminal truncation variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at