rs1232734822

chr5-112707817-G-Achr5-112707817-G-Cchr5-112707817-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001407446.1(APC):c.100G>A(p.Val34Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000246 in 1,218,342 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 9/12 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V34F) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000025 (0 hom.)
• Consequence: APC NM_001407446.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.40

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1661425).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APC	NM_001407446.1	c.100G>A	p.Val34Ile	missense_variant	1/16
APC	NM_001354897.2	c.100G>A	p.Val34Ile	missense_variant	1/15
APC	NM_001127511.3	c.100G>A	p.Val34Ile	missense_variant	1/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APC	ENST00000507379.6	c.100G>A	p.Val34Ile	missense_variant	1/14	2
APC	ENST00000509732.6	c.-19+168G>A		intron_variant		4		P1
APC	ENST00000505350.2	c.100G>A	p.Val34Ile	missense_variant, NMD_transcript_variant	1/16	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000742 AC: 1 AN: 134712 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 73356

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000952

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000246 AC: 3 AN: 1218342 Hom.: 0 Cov.: 31 AF XY: 0.00000168 AC XY: 1 AN XY: 595206

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000825

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000103

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial adenomatous polyposis 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 08, 2022

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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. ClinVar contains an entry for this variant (Variation ID: 537595). This variant has not been reported in the literature in individuals affected with APC-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant occurs in a non-coding region of the APC gene. It does not change the encoded amino acid sequence of the APC protein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.099	D
BayesDel_noAF	Benign	-0.10
Cadd	Benign	16
Dann	Uncertain	1.0
Eigen	Benign	-0.37
Eigen_PC	Benign	-0.41
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.44	T
MetaRNN	Benign	0.17	T
MetaSVM	Uncertain	0.14	D
MutationTaster	Benign	1.0	D
PROVEAN	Benign	0.56	N
REVEL	Benign	0.20
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.044	D
MutPred		0.23		Loss of sheet (P = 0.0817);
MVP		0.78
ClinPred		0.56	D
GERP RS		3.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1232734822; hg19: chr5-112043514;