rs150209825
Variant summary
Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS2
The NM_000038.6(APC):c.2222A>G(p.Asn741Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000026 in 1,613,932 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. N741N) has been classified as Benign.
Frequency
Consequence
NM_000038.6 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -7 ACMG points.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
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APC | ENST00000257430.9 | c.2222A>G | p.Asn741Ser | missense_variant | Exon 16 of 16 | 5 | NM_000038.6 | ENSP00000257430.4 | ||
ENSG00000258864 | ENST00000520401.1 | n.228+8844A>G | intron_variant | Intron 3 of 7 | 3 | ENSP00000454861.1 |
Frequencies
GnomAD3 genomes AF: 0.0000197 AC: 3AN: 152198Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000200 AC: 5AN: 250138Hom.: 0 AF XY: 0.0000222 AC XY: 3AN XY: 135256
GnomAD4 exome AF: 0.0000267 AC: 39AN: 1461734Hom.: 0 Cov.: 33 AF XY: 0.0000261 AC XY: 19AN XY: 727164
GnomAD4 genome AF: 0.0000197 AC: 3AN: 152198Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2AN XY: 74352
ClinVar
Submissions by phenotype
Familial adenomatous polyposis 1 Uncertain:4
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This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 741 of the APC protein (p.Asn741Ser). This variant is present in population databases (rs150209825, gnomAD 0.005%). This missense change has been observed in individual(s) with colorectal cancer, suspected Lynch syndrome, and/or parathyroid adenomas (PMID: 25559809, 25980754, 28944238, 36900197). ClinVar contains an entry for this variant (Variation ID: 184580). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt APC protein function with a negative predictive value of 95%. 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. -
This variant is classified as a variant of uncertain significance as there is insufficient evidence to determine its impact on protein function and/or cancer risk. -
Hereditary cancer-predisposing syndrome Uncertain:1Benign:2
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This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
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not provided Uncertain:2
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Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 25980754, 25559809, 28944238, 18199528, 36900197) -
not specified Uncertain:1
Variant summary: APC c.2222A>G (p.Asn741Ser) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 2e-05 in 250138 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.2222A>G has been reported in the literature in individuals testing for Lynch syndrome, affected with early onset familial colorectal cancer and other types of tumors (examples: Chubb _2015, Yurgelun__2015, Moradian_2021, Storvall_2023). These report(s) do not provide unequivocal conclusions about association of the variant with Familial Adenomatous Polyposis. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 25559809, 33558524, 36900197, 25980754). ClinVar contains an entry for this variant (Variation ID: 184580). Based on the evidence outlined above, the variant was classified as uncertain significance. -
APC-related disorder Uncertain:1
The APC c.2222A>G variant is predicted to result in the amino acid substitution p.Asn741Ser. This variant has been reported in individuals with colorectal cancer (Table A1. Chubb et al 2015. PubMed ID: 25559809; Table S2. DeRycke et al 2017. PubMed ID: 28944238), suspected Lynch syndrome (Suppl Table 2. Yurgelun et al 2015. PubMed ID: 25980754), or parathyroid adenomas (Table 2. Storvall et al 2023. PubMed ID: 36900197). This variant is reported in 0.0039% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpreted as uncertain by majority of the submitters in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/184580/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -
Classic or attenuated familial adenomatous polyposis Benign:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at