rs775783026

Positions:

chr17-65537837-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 9P and 4B. PVS1PP5BS2

The NM_004655.4(AXIN2):c.1201-2A>G variant causes a splice acceptor change. The variant allele was found at a frequency of 0.00000711 in 1,547,836 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000064 ( 0 hom. )

Consequence

AXIN2
NM_004655.4 splice_acceptor

Scores

Splicing: ADA: 1.000

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:5U:1O:1

Conservation

PhyloP100: 6.98

Variant links:

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 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.

PP5

Variant 17-65537837-T-C is Pathogenic according to our data. Variant chr17-65537837-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 464525.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=5, not_provided=1, Uncertain_significance=1}.

BS2

High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AXIN2	NM_004655.4 linkuse as main transcript	c.1201-2A>G		splice_acceptor_variant		ENST00000307078.10	NP_004646.3

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	Appris
AXIN2	ENST00000307078.10 linkuse as main transcript	c.1201-2A>G	splice_acceptor_variant	1	NM_004655.4	ENSP00000302625	P1
AXIN2	ENST00000375702.5 linkuse as main transcript	c.1201-2A>G	splice_acceptor_variant	1		ENSP00000364854
AXIN2	ENST00000618960.4 linkuse as main transcript	c.1201-2A>G	splice_acceptor_variant	5		ENSP00000478916

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152026

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000645

AC:

AN:

1395810

Hom.:

Cov.:

AF XY:

0.00000437

AC XY:

AN XY:

687130

show subpopulations

Gnomad4 AFR exome

AF:

0.0000317

Gnomad4 AMR exome

AF:

0.00

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:

0.00000741

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152026

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74228

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.00000829

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:5Uncertain:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Oligodontia-cancer predisposition syndrome

Pathogenic:3

Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 11, 2022	This sequence change affects an acceptor splice site in intron 5 of the AXIN2 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in AXIN2 are known to be pathogenic (PMID: 15042511, 21416598). 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 has not been reported in the literature in individuals affected with AXIN2-related conditions. ClinVar contains an entry for this variant (Variation ID: 464525). Studies have shown that disruption of this splice site is associated with altered splicing resulting in multiple RNA products (Invitae). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	May 17, 2023	This variant is considered likely pathogenic. This variant occurs within a consensus splice junction and is predicted to result in abnormal mRNA splicing of either an out-of-frame exon or an in-frame exon necessary for protein stability and/or normal function. -
Likely pathogenic, criteria provided, single submitter	clinical testing	MGZ Medical Genetics Center	Mar 24, 2022	- -

Colorectal cancer

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Feb 17, 2024

- -

Hereditary cancer-predisposing syndrome

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 28, 2023

The c.1201-2A>G intronic variant results from an A to G substitution two nucleotides upstream from coding exon 5 in the AXIN2 gene. This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice acceptor site and may result in the creation or strengthening of a novel splice acceptor site; however, direct evidence is insufficient at this time (Ambry internal data). Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as likely pathogenic. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jun 21, 2022

Not observed at significant frequency in large population cohorts (gnomAD); Canonical splice site variant with an unclear effect on protein function and both splice predictors and evolutionary conservation support a deleterious effect, although in the absence of functional evidence the actual effect of this sequence change is unknown.; Observed in an individual with glioblastoma (Huang 2018); This variant is associated with the following publications: (PMID: 29625052) -

AXIN2-related attenuated familial adenomatous polyposis

Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

Variant interpreted as Likely pathogenic and reported on 01-10-2020 by Lab or GTR ID 61756. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.60

BayesDel_noAF

Benign

-0.24

CADD

Pathogenic

DANN

Benign

0.97

Eigen

Pathogenic

0.95

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Pathogenic

0.98

MutationTaster

Benign

1.0

D;D

GERP RS

5.3

RBP_binding_hub_radar

0.67

RBP_regulation_power_radar

1.8

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.73

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.34

Position offset: -9

DS_AL_spliceai

0.99

Position offset: -2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over