17-65557819-C-G

Variant names:

• chr17-65557819-C-G
• rs745659837
• NM_004655.4:c.802G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004655.4(AXIN2):​c.802G>C​(p.Asp268His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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. D268N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: AXIN2 NM_004655.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.45
• Publications: 2 publications found

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]

AXIN2 Gene-Disease associations (from GenCC):

• oligodontia-cancer predisposition syndrome

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• craniosynostosis

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ENSG00000266076 (HGNC:):

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2245011).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AXIN2	NM_004655.4	c.802G>C	p.Asp268His	missense_variant	Exon 2 of 11	ENST00000307078.10	NP_004646.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AXIN2	ENST00000307078.10	c.802G>C	p.Asp268His	missense_variant	Exon 2 of 11	1	NM_004655.4	ENSP00000302625.5
ENSG00000266076	ENST00000577662.1	n.*978G>C		non_coding_transcript_exon_variant	Exon 4 of 7	2		ENSP00000462418.1
ENSG00000266076	ENST00000577662.1	n.*978G>C		3_prime_UTR_variant	Exon 4 of 7	2		ENSP00000462418.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Oligodontia-cancer predisposition syndrome Uncertain:1

Sep 06, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ClinVar contains an entry for this variant (Variation ID: 1400290). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). 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. This sequence change replaces aspartic acid, which is acidic and polar, with histidine, which is basic and polar, at codon 268 of the AXIN2 protein (p.Asp268His). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with AXIN2-related conditions. -

Hereditary cancer-predisposing syndrome Uncertain:1

Dec 15, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.D268H variant (also known as c.802G>C), located in coding exon 1 of the AXIN2 gene, results from a G to C substitution at nucleotide position 802. The aspartic acid at codon 268 is replaced by histidine, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.0086	T
BayesDel_noAF	Benign	-0.25
CADD	Uncertain	24
DANN	Benign	0.83
DEOGEN2	Benign	0.23	.;T;T;T
Eigen	Benign	-0.17
Eigen_PC	Benign	-0.053
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.88	.;D;.;T
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.22	T;T;T;T
MetaSVM	Benign	-0.28	T
PhyloP100		7.5
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-0.73	N;.;N;.
REVEL	Uncertain	0.33
Sift	Uncertain	0.0090	D;.;D;.
Sift4G	Uncertain	0.011	D;D;D;.
Polyphen		0.55	.;P;P;.
Vest4		0.13
MutPred		0.21		Gain of MoRF binding (P = 0.0401);Gain of MoRF binding (P = 0.0401);Gain of MoRF binding (P = 0.0401);Gain of MoRF binding (P = 0.0401);
MVP		0.68
MPC		0.33
ClinPred		0.53	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
gMVP		0.40
Mutation Taster		=67/33	polymorphism

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: rs745659837; hg19: chr17-63553937;