rs772908702

Positions:

• chr17-65538276-G-A
• chr17-65538276-G-C

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4 BP6 BS2

The NM_004655.4(AXIN2):​c.1127C>T​(p.Ser376Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000616 in 1,461,888 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S376P) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: AXIN2 NM_004655.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:1
• Conservation: PhyloP100: 5.95

Genes affected

AXIN2 (HGNC:904): (axin 2) The Axin-related protein, Axin2, presumably plays an important role in the regulation of the stability of beta-catenin in the Wnt signaling pathway, like its rodent homologs, mouse conductin/rat axil. In mouse, conductin organizes a multiprotein complex of APC (adenomatous polyposis of the colon), beta-catenin, glycogen synthase kinase 3-beta, and conductin, which leads to the degradation of beta-catenin. Apparently, the deregulation of beta-catenin is an important event in the genesis of a number of malignancies. The AXIN2 gene has been mapped to 17q23-q24, a region that shows frequent loss of heterozygosity in breast cancer, neuroblastoma, and other tumors. Mutations in this gene have been associated with colorectal cancer with defective mismatch repair. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.3617326).
• BP6: Variant 17-65538276-G-A is Benign according to our data. Variant chr17-65538276-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 956195.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Likely_benign=1}.
• BS2: High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AXIN2	NM_004655.4	c.1127C>T	p.Ser376Leu	missense_variant	5/11	ENST00000307078.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AXIN2	ENST00000307078.10	c.1127C>T	p.Ser376Leu	missense_variant	5/11	1	NM_004655.4	P1
AXIN2	ENST00000375702.5	c.1127C>T	p.Ser376Leu	missense_variant	4/9	1
AXIN2	ENST00000618960.4	c.1127C>T	p.Ser376Leu	missense_variant	5/10	5

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD3 exomes AF: 0.0000318 AC: 8 AN: 251220 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135822

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000202

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000616 AC: 9 AN: 1461888 Hom.: 0 Cov.: 38 AF XY: 0.00000138 AC XY: 1 AN XY: 727244

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.000179

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Oligodontia-cancer predisposition syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 29, 2023

This sequence change replaces serine, which is neutral and polar, with leucine, which is neutral and non-polar, at codon 376 of the AXIN2 protein (p.Ser376Leu). This variant is present in population databases (rs772908702, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with AXIN2-related conditions. ClinVar contains an entry for this variant (Variation ID: 956195). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt AXIN2 protein function with a negative predictive value of 80%. 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. -

Colorectal cancer Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Oct 13, 2023

- -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 17, 2024

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.076
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.13
CADD	Benign	23
DANN	Benign	0.91
Eigen	Benign	0.0026
Eigen_PC	Benign	0.079
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Pathogenic	0.47	D
MetaRNN	Benign	0.36	T;T;T
MetaSVM	Benign	-0.44	T
MutationTaster	Benign	0.93	D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Uncertain	-2.7	D;.;D
REVEL	Uncertain	0.34
Sift	Benign	0.48	T;.;T
Sift4G	Benign	0.69	T;T;T
Polyphen		0.40	.;B;B
Vest4		0.24
MutPred		0.31		Loss of phosphorylation at S376 (P = 0.0171);Loss of phosphorylation at S376 (P = 0.0171);Loss of phosphorylation at S376 (P = 0.0171);
MVP		0.80
MPC		0.16
ClinPred		0.20	T
GERP RS		4.2
gMVP		0.20

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

Publications

LitVar

Other links and lift over

dbSNP: rs772908702; hg19: chr17-63534394; COSMIC: COSV61059082; COSMIC: COSV61059082;