NM_000038.6:c.6796_6810delACAGCCACCACTTCT

Variant names:

• chr5-112842389-AACAGCCACCACTTCT-A
• rs1057517569
• NM_000038.6:c.6796_6810delACAGCCACCACTTCT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 1P and 1B. BS2_Supporting PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.6796_6810del variant is predicted to cause a change in the length of the protein due to an in-frame deletion of 5 amino acids (p.Thr2266_Ser2270del). This variant has been observed in 3 heterozygous individuals over the age of 50 with no features of FAP or family history of FAP, which is worth 3 healthy individual points (BS2_Supporting; Invitae internal data). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). Due to insufficient evidence, this variant is classified as a Variant of Uncertain Significance (VUS) for FAP based on the ACMG/AMP criteria applied, as specified by the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis Variant Curation Expert Panel: BS2_Supporting and PM2_Supporting (VCEP specifications version 1; date of approval: 12/12/2022). LINK:https://erepo.genome.network/evrepo/ui/classification/CA16042098/MONDO:0021056/089

• Frequency: Genomes: not found (cov: 32)
• Consequence: APC NM_000038.6 conservative_inframe_deletion
• Clinical Significance: Uncertain significance reviewed by expert panel U:5
• Conservation: PhyloP100: 5.04
• Publications: 0 publications found

Genes affected

APC (HGNC:583): (APC regulator of WNT signaling pathway) This gene encodes a tumor suppressor protein that acts as an antagonist of the Wnt signaling pathway. It is also involved in other processes including cell migration and adhesion, transcriptional activation, and apoptosis. Defects in this gene cause familial adenomatous polyposis (FAP), an autosomal dominant pre-malignant disease that usually progresses to malignancy. Mutations in the APC gene have been found to occur in most colorectal cancers, where disease-associated mutations tend to be clustered in a small region designated the mutation cluster region (MCR) and result in a truncated protein product. [provided by RefSeq, Jun 2022]

APC Gene-Disease associations (from GenCC):

• classic or attenuated familial adenomatous polyposis

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• desmoid tumor

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp
• familial adenomatous polyposis 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics
• gastric adenocarcinoma and proximal polyposis of the stomach

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen, Orphanet
• sarcoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• APC-related attenuated familial adenomatous polyposis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Turcot syndrome with polyposis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Cenani-Lenz syndactyly syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000258864 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• BS2: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APC	NM_000038.6	c.6796_6810delACAGCCACCACTTCT	p.Thr2266_Ser2270del	conservative_inframe_deletion	Exon 16 of 16	ENST00000257430.9	NP_000029.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APC	ENST00000257430.9	c.6796_6810delACAGCCACCACTTCT	p.Thr2266_Ser2270del	conservative_inframe_deletion	Exon 16 of 16	5	NM_000038.6	ENSP00000257430.4
ENSG00000258864	ENST00000520401.1	n.228+13418_228+13432delACAGCCACCACTTCT		intron_variant	Intron 3 of 7	3		ENSP00000454861.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: reviewed by expert panel

Submissions by phenotype

Familial adenomatous polyposis 1 Uncertain:4

Mar 06, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.6796_6810del, results in the deletion of 5 amino acid(s) of the APC protein (p.Thr2266_Ser2270del), but otherwise preserves the integrity of the reading frame. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with APC-related conditions. ClinVar contains an entry for this variant (Variation ID: 371858). 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. -

May 23, 2016

Counsyl

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Feb 14, 2023

Myriad Genetics, Inc.

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Feb 26, 2023

ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis Variant Curation Expert Panel

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

The c.6796_6810del variant is predicted to cause a change in the length of the protein due to an in-frame deletion of 5 amino acids (p.Thr2266_Ser2270del). This variant has been observed in 3 heterozygous individuals over the age of 50 with no features of FAP or family history of FAP, which is worth 3 healthy individual points (BS2_Supporting; Invitae internal data). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). Due to insufficient evidence, this variant is classified as a Variant of Uncertain Significance (VUS) for FAP based on the ACMG/AMP criteria applied, as specified by the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis Variant Curation Expert Panel: BS2_Supporting and PM2_Supporting (VCEP specifications version 1; date of approval: 12/12/2022). -

Hereditary cancer-predisposing syndrome Uncertain:1

Sep 02, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.6796_6810del15 variant (also known as p.T2266_S2270del) is located in coding exon 15 of the APC gene. This variant results from an in-frame deletion of 15 nucleotides at nucleotide positions 6796 to 6810. This results in the in-frame deletion of 5 amino acids at codons 2266 to 2270. This amino acid region is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive (Choi Y et al. PLoS ONE. 2012; 7(10):e46688). Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1057517569; hg19: chr5-112178086;