rs397507374
Variant summary
Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4
The NM_000059.4(BRCA2):c.6567C>A(p.Asn2189Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,457,636 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N2189Y) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000027 ( 0 hom. )
Consequence
BRCA2
NM_000059.4 missense
NM_000059.4 missense
Scores
3
13
Clinical Significance
Conservation
PhyloP100: -1.95
Genes affected
BRCA2 (HGNC:1101): (BRCA2 DNA repair associated) Inherited mutations in BRCA1 and this gene, BRCA2, confer increased lifetime risk of developing breast or ovarian cancer. Both BRCA1 and BRCA2 are involved in maintenance of genome stability, specifically the homologous recombination pathway for double-strand DNA repair. The largest exon in both genes is exon 11, which harbors the most important and frequent mutations in breast cancer patients. The BRCA2 gene was found on chromosome 13q12.3 in human. The BRCA2 protein contains several copies of a 70 aa motif called the BRC motif, and these motifs mediate binding to the RAD51 recombinase which functions in DNA repair. BRCA2 is considered a tumor suppressor gene, as tumors with BRCA2 mutations generally exhibit loss of heterozygosity (LOH) of the wild-type allele. [provided by RefSeq, May 2020]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 1 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (MetaRNN=0.37626725).
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
|---|---|---|---|---|---|---|---|
| BRCA2 | NM_000059.4 | c.6567C>A | p.Asn2189Lys | missense_variant | 11/27 | ENST00000380152.8 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|
| BRCA2 | ENST00000380152.8 | c.6567C>A | p.Asn2189Lys | missense_variant | 11/27 | 5 | NM_000059.4 | A2 |
Frequencies
GnomAD3 genomes
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 0.00000274 AC: 4AN: 1457636Hom.: 0 Cov.: 35 AF XY: 0.00000138 AC XY: 1AN XY: 724852
GnomAD4 exome
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1457636
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35
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1
AN XY:
724852
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GnomAD4 genome
GnomAD4 genome
Cov.:
32
Bravo
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Uncertain:8Benign:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
not provided Uncertain:3
| Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Feb 24, 2020 | Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge - |
| Uncertain significance, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | Apr 25, 2019 | - - |
| Uncertain significance, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Mar 06, 2018 | - - |
Hereditary cancer-predisposing syndrome Uncertain:2Benign:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Mar 08, 2023 | The p.N2189K variant (also known as c.6567C>A), located in coding exon 10 of the BRCA2 gene, results from a C to A substitution at nucleotide position 6567. The asparagine at codon 2189 is replaced by lysine, an amino acid with some similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
| Likely benign, criteria provided, single submitter | curation | University of Washington Department of Laboratory Medicine, University of Washington | Mar 23, 2023 | Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673). - |
| Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Oct 11, 2022 | This missense variant replaces asparagine with lysine at codon 2189 of the BRCA2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with hereditary cancer in the literature. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:2
| Uncertain significance, no assertion criteria provided | clinical testing | Sharing Clinical Reports Project (SCRP) | Mar 03, 2010 | - - |
| Uncertain significance, criteria provided, single submitter | clinical testing | Counsyl | Jun 14, 2016 | - - |
Hereditary breast ovarian cancer syndrome Uncertain:1
| Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Dec 05, 2023 | This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 2189 of the BRCA2 protein (p.Asn2189Lys). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with BRCA2-related conditions. ClinVar contains an entry for this variant (Variation ID: 182227). 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 BRCA2 protein function with a negative predictive value of 95%. 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. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Benign
T
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
N
M_CAP
Uncertain
D
MetaRNN
Benign
T;T
MetaSVM
Benign
T
MutationTaster
Benign
N;N
PrimateAI
Benign
T
PROVEAN
Benign
N;N
REVEL
Uncertain
Sift
Uncertain
D;D
Sift4G
Benign
T;T
Vest4
MutPred
Gain of methylation at N2189 (P = 0.0172);Gain of methylation at N2189 (P = 0.0172);
MVP
MPC
0.028
ClinPred
D
GERP RS
gMVP
Splicing
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Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at