rs55773834
Variant summary
Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBP6
The NM_000059.4(BRCA2):c.2813C>A(p.Ala938Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000018 in 1,613,576 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict 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. A938T) has been classified as Likely benign.
Frequency
Consequence
NM_000059.4 missense
Scores
Clinical Significance
Conservation
Publications
- breast-ovarian cancer, familial, susceptibility to, 2Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen
- Fanconi anemia complementation group D1Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen, G2P
- pancreatic cancer, susceptibility to, 2Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
- sarcomaInheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
- hereditary breast ovarian cancer syndromeInheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
- Fanconi anemiaInheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
- medulloblastomaInheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
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ACMG classification
Our verdict: Likely_benign. The variant received -3 ACMG points.
Transcripts
RefSeq
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| BRCA2 | ENST00000380152.8 | c.2813C>A | p.Ala938Glu | missense_variant | Exon 11 of 27 | 5 | NM_000059.4 | ENSP00000369497.3 | ||
| BRCA2 | ENST00000530893.7 | c.2444C>A | p.Ala815Glu | missense_variant | Exon 11 of 27 | 1 | ENSP00000499438.2 | |||
| BRCA2 | ENST00000614259.2 | n.2813C>A | non_coding_transcript_exon_variant | Exon 10 of 26 | 2 | ENSP00000506251.1 |
Frequencies
GnomAD3 genomes AF: 0.000138 AC: 21AN: 152130Hom.: 0 Cov.: 32 show subpopulations
GnomAD2 exomes AF: 0.0000279 AC: 7AN: 250824 AF XY: 0.0000295 show subpopulations
GnomAD4 exome AF: 0.00000547 AC: 8AN: 1461446Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1AN XY: 727014 show subpopulations
Age Distribution
GnomAD4 genome AF: 0.000138 AC: 21AN: 152130Hom.: 0 Cov.: 32 AF XY: 0.000175 AC XY: 13AN XY: 74318 show subpopulations
Age Distribution
ClinVar
Submissions by phenotype
Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:4
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This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -
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Hereditary cancer-predisposing syndrome Uncertain:1Benign:3
Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673). -
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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. -
not provided Uncertain:2
In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Identified in individuals with glioblastoma and breast cancer (PMID: 26689913, Renata Mendes de Freitas et al. (2022) Mastology. 32; Published functional studies demonstrate cell viability and drug sensitivity comparable to wild type in mouse embryonic stem cells (PMID: 37922907); This variant is associated with the following publications: (PMID: 28873162, 23929434, 26689913, 28122867, de Freitas_2022, 32377563, 31911673, 26295337, 29884841, 31853058, 37922907) -
The BRCA2 c.2813C>A (p.Ala938Glu) variant has been reported in the published literature in individuals affected with breast cancer (Freitas et al. 2022. Mastology 32:e20220003), glioblastoma (PMID: 26689913 (2015)), and an advanced cancer (PMID: 28873162 (2017)). A published functional study has reported that this variant retains BRCA2 function (PMID: 37922907 (2023)). The frequency of this variant in the general population, 0.0004 (10/24886 chromosomes in African/African American subpopulation (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is higher than would generally be expected for pathogenic variants in this gene. 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 benign. Based on the available information, we are unable to determine the clinical significance of this variant. -
not specified Uncertain:1
Variant summary: BRCA2 c.2813C>A (p.Ala938Glu) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 2.8e-05 in 250824 control chromosomes. Although the observed frequency does not exceed the estimated maximal expected allele frequency of a pathogenic variant in this gene (0.00075), the variant may represent a rare ethnic-specific functional polymorphism as evidenced by it being found in 3 African American women over 70 years old who have never had cancer (FLOSSIES database). c.2813C>A has been reported in the literature in individuals affected with cancer, including glioblastoma (example, Lu_2015, Mandelker_2017). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. The variant was reported as functional via a mouse embryonic stem cell (mESC)-based assays (Biwas_2023). ClinVar contains an entry for this variant (Variation ID: 51353). Based on the evidence outlined above, the variant was classified as uncertain significance. -
BRCA2-related disorder Uncertain:1
The BRCA2 c.2813C>A variant is predicted to result in the amino acid substitution p.Ala938Glu. This variant has been reported in individuals with breast cancer, an individual with glioblastoma multiforme, and an individual with advanced cancer (Infante et al. 2013. PubMed ID: 23929434; Table S13, Lu et al. 2015. PubMed ID: 26689913; eTable, Mandelker et al. 2017. PubMed ID: 28873162). This variant occurs within a region of the BRCA2 gene that is predicted to be tolerant to variation (Table 2, Dines et al. 2020. PubMed ID: 31911673). This variant is reported in 0.040% of alleles in individuals of African descent in gnomAD. It has conflicting interpretations of likely benign and uncertain significance in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/51353/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -
Hereditary breast ovarian cancer syndrome Benign:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at