NM_000038.6:c.4735A>T

Variant names:

• chr5-112840329-A-T
• rs587781935
• NM_000038.6:c.4735A>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2_Supporting PS4_Supporting BP1 PS3_Supporting

This summary comes from the ClinGen Evidence Repository: The NM_000038.6(APC):c.4735A>T variant in APC is a missense variant predicted to cause substitution of Isoleucine by Phenylalanine at amino acid position 1579 (p.Ile1579Phe). β-catenin regulated transcription activity assay in SW480 cells showed increased β-catenin regulated transcription activity indicating that this variant impacts protein function (PS3_Supporting, PMID:18199528). This variant has been reported in 3 probands meeting phenotypic criteria, resulting in a total phenotype score of 1.5 points (PS4_Supporting [Ambry Genetics, Invitae, GeneDx]). The variant has been reported in 1 additional proband with a colorectal cancer/polyposis associated phenotype not meeting phenotypic criteria (Ambry Genetics). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). APC, in which the variant was identified, is defined by the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis VCEP (HCCP VCEP) as a gene for which primarily truncating variants are known to cause disease (BP1). In summary, this variant is a VUS for autosomal-dominant inherited FAP based on the ACMG/AMP criteria applied, as specified by the HCCP VCEP: BP1, PS3_Supporting, PS4_Supporting, PM2_Supporting (VCEP specifications version v2.1.0; date of approval 11/24/2023). LINK:https://erepo.genome.network/evrepo/ui/classification/CA10584253/MONDO:0021056/089

• Frequency: Genomes: not found (cov: 32)
• Consequence: APC NM_000038.6 missense
• Clinical Significance: Uncertain significance reviewed by expert panel P:1 U:4
• Conservation: PhyloP100: 8.95
• Publications: 4 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: Ambry Genetics, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• gastric adenocarcinoma and proximal polyposis of the stomach

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

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• BP1: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000038.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	APC	NM_000038.6	MANE Select	c.4735A>T	p.Ile1579Phe	missense	Exon 16 of 16	NP_000029.2
	APC	NM_001407446.1		c.4819A>T	p.Ile1607Phe	missense	Exon 16 of 16	NP_001394375.1
	APC	NM_001354896.2		c.4789A>T	p.Ile1597Phe	missense	Exon 17 of 17	NP_001341825.1	R4GMU6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	APC	ENST00000257430.9	TSL:5 MANE Select	c.4735A>T	p.Ile1579Phe	missense	Exon 16 of 16	ENSP00000257430.4	P25054-1
	APC	ENST00000508376.6	TSL:1	c.4735A>T	p.Ile1579Phe	missense	Exon 17 of 17	ENSP00000427089.2	P25054-1
	APC	ENST00000508624.5	TSL:1	n.*4057A>T		non_coding_transcript_exon	Exon 17 of 17	ENSP00000424265.1	E7EMH9

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 66

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
-	2	-	Familial adenomatous polyposis 1 (2)
-	1	-	Classic or attenuated familial adenomatous polyposis (1)
1	-	-	Hereditary cancer-predisposing syndrome (1)
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.48
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.90	D
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Uncertain	2.0	M
PhyloP100		8.9
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-2.9	D
REVEL	Pathogenic	0.87
Sift	Uncertain	0.0090	D
Sift4G	Uncertain	0.0070	D
Polyphen		1.0	D
Vest4		0.84
MutPred		0.79		Gain of glycosylation at S1581 (P = 0.0994)
MVP		0.98
ClinPred		0.95	D
GERP RS		6.2
Varity_R		0.74
gMVP		0.84
Mutation Taster		=9/91	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs587781935; hg19: chr5-112176026;