rs778143946

Variant names:

Variant summary

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

The NM_005431.2(XRCC2):c.509A>C(p.Glu170Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000347 in 1,614,092 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000032 ( 0 hom. )

Consequence

XRCC2
NM_005431.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 6.50

Variant links:

Genes affected

XRCC2 (HGNC:12829): (X-ray repair cross complementing 2) This gene encodes a member of the RecA/Rad51-related protein family that participates in homologous recombination to maintain chromosome stability and repair DNA damage. This gene is involved in the repair of DNA double-strand breaks by homologous recombination and it functionally complements Chinese hamster irs1, a repair-deficient mutant that exhibits hypersensitivity to a number of different DNA-damaging agents. [provided by RefSeq, Jul 2008]

XRCC2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
XRCC2	NM_005431.2 link	c.509A>C	p.Glu170Ala	missense_variant	Exon 3 of 3	ENST00000359321.2	NP_005422.1	O43543A0A384MEK2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
XRCC2	ENST00000359321.2 link	c.509A>C	p.Glu170Ala	missense_variant	Exon 3 of 3	1	NM_005431.2	ENSP00000352271.1	O43543
XRCC2	ENST00000495707.1 link	n.531A>C		non_coding_transcript_exon_variant	Exon 3 of 3	1
XRCC2	ENST00000698506.1 link	c.341A>C	p.Glu114Ala	missense_variant	Exon 2 of 2			ENSP00000513758.1	A0A8V8TMB7

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.00191

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251380

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135852

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000867

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:

0.0000264

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000322

AC:

AN:

1461888

Hom.:

Cov.:

AF XY:

0.0000330

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000894

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:

0.0000360

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152204

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74348

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000262

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:

0.00191

Alfa

AF:

0.0000254

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Aug 31, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with alanine, which is neutral and non-polar, at codon 170 of the XRCC2 protein (p.Glu170Ala). This variant is present in population databases (rs778143946, gnomAD 0.009%). This missense change has been observed in individual(s) with breast cancer (PMID: 23054243). ClinVar contains an entry for this variant (Variation ID: 409967). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt XRCC2 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change does not substantially affect XRCC2 function (PMID: 27233470). 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. -

Sep 17, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The XRCC2 c.509A>C (p.Glu170Ala) variant has been reported in the published literature in individuals with breast cancer (PMIDs: 23054243 (2012) and 28779002 (2017)). In a large scale breast cancer association study, this variant has been observed in 3 breast cancer cases and 2 reportedly healthy individuals (PMID: 33471991 (2021), see also LOVD (http://databases.lovd.nl/shared)). A functional study demonstrated that this variant does not alter the protein function (PMID: 27233470 (2016)). The frequency of this variant in the general population, 0.000087 (3/34590 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is damaging. Based on the available information, we are unable to determine the clinical significance of this variant. -

Apr 14, 2016

Leiden Open Variation Database

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: curation

Curator: Arleen D. Auerbach. Submitter to LOVD: Florentine Hilbers. -

Hereditary cancer-predisposing syndrome

Uncertain:2

Jul 02, 2018

Mendelics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 23, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.E170A variant (also known as c.509A>C), located in coding exon 3 of the XRCC2 gene, results from an A to C substitution at nucleotide position 509. The glutamic acid at codon 170 is replaced by alanine, an amino acid with dissimilar properties. In one study, this alteration was reported in 1/3548 non-BRCA1/2 familial breast cancer cases and 2/1435 healthy controls (Hilbers FS et al. J. Med. Genet., 2012 Oct;49:618-20). This alteration has also been reported in at least one subject in a study of 13087 breast cancer cases and 5488 control individuals in the UK (Decker B et al. J. Med. Genet., 2017 11;54:732-741). A cDNA complementation assay showed that the DNA repair efficiency of this alteration is similar to wild type (Hilbers FS et al. Hum. Mutat., 2016 09;37:914-25). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. 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

Uncertain

0.51

BayesDel_addAF

Uncertain

0.022

BayesDel_noAF

Uncertain

-0.010

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Benign

0.15

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.59

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.85

M_CAP

Uncertain

0.13

MetaRNN

Uncertain

0.74

MetaSVM

Uncertain

-0.28

MutationAssessor

Uncertain

2.3

PrimateAI

Benign

0.47

PROVEAN

Benign

-2.2

REVEL

Uncertain

0.38

Sift

Uncertain

0.010

Sift4G

Uncertain

0.012

Polyphen

0.97

Vest4

0.66

MutPred

0.46

Loss of disorder (P = 0.0295);

MVP

0.68

MPC

0.28

ClinPred

0.65

GERP RS

5.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.33

gMVP

0.51

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

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