rs200151646
Variant summary
Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBP6
The NM_000038.6(APC):āc.6525A>Gā(p.Thr2175Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000237 in 1,611,204 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. T2175T) has been classified as Likely benign.
Frequency
Consequence
NM_000038.6 synonymous
Scores
Clinical Significance
Conservation
Publications
- classic or attenuated familial adenomatous polyposisInheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
- desmoid tumorInheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp
- familial adenomatous polyposis 1Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
- gastric adenocarcinoma and proximal polyposis of the stomachInheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet
- sarcomaInheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
- APC-related attenuated familial adenomatous polyposisInheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
- Turcot syndrome with polyposisInheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
- Cenani-Lenz syndactyly syndromeInheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
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ACMG classification
Our verdict: Likely_benign. The variant received -5 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.6525A>G | p.Thr2175Thr | synonymous_variant | Exon 16 of 16 | 5 | NM_000038.6 | ENSP00000257430.4 | ||
ENSG00000258864 | ENST00000520401.1 | n.228+13147A>G | intron_variant | Intron 3 of 7 | 3 | ENSP00000454861.1 |
Frequencies
GnomAD3 genomes AF: 0.0000920 AC: 14AN: 152184Hom.: 0 Cov.: 32 show subpopulations
GnomAD2 exomes AF: 0.000112 AC: 28AN: 248902 AF XY: 0.000156 show subpopulations
GnomAD4 exome AF: 0.000252 AC: 368AN: 1458902Hom.: 0 Cov.: 34 AF XY: 0.000244 AC XY: 177AN XY: 725856 show subpopulations
Age Distribution
GnomAD4 genome AF: 0.0000919 AC: 14AN: 152302Hom.: 0 Cov.: 32 AF XY: 0.0000940 AC XY: 7AN XY: 74486 show subpopulations
Age Distribution
ClinVar
Submissions by phenotype
not specified Uncertain:1Benign:2
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Variant Summary: The c.6525A>G (p.Thr2175Thr) variant involves the alteration of a non-conserved nucleotide resulting in a synonymous change. 4/5 in silico tools via Alamut predict the strengthening of a cryptic splice donor site as well as minor changes to other binding motifs, however, the significance of these predictions has not been supported with functional studies. The variant was observed in the general population dataset of gnomAD at an allele frequency of 0.00011 (32/275542 chromosomes tested), predominantly observed in the European (Non-Finnish) subpopulation at a frequency of 0.0002 (26/126026 chromosomes). This frequency exceeds the maximal expected allele frequency for a pathogenic variant in APC (0.00007) by 3-folds, strongly supporting that this is a benign polymorphism found primarily in population(s) of European origin. The variant has been reported once in the literature in a CRC patient without strong evidence for or against pathogenicity (Borras_2013). In addition, multiple clinical laboratories/reputable databases have classified the variant as likely benign. Taken together, this variant has been classified as benign. -
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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Classic or attenuated familial adenomatous polyposis Uncertain:1Benign:1
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Familial adenomatous polyposis 1 Benign:2
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This variant is considered benign. This variant is a silent/synonymous amino acid change and it is not expected to impact splicing. -
not provided Benign:2
This variant is associated with the following publications: (PMID: 23709753, 28526081) -
APC: BP4, BP7 -
APC-Associated Polyposis Disorders Uncertain:1
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. -
APC-related disorder Benign:1
This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at