rs397507365
Variant summary
Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP6
The NM_000059.4(BRCA2):c.6196G>A(p.Val2066Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000434 in 1,612,716 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. V2066A) 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 -1 ACMG points.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| BRCA2 | NM_000059.4 | c.6196G>A | p.Val2066Ile | missense_variant | Exon 11 of 27 | ENST00000380152.8 | NP_000050.3 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| BRCA2 | ENST00000380152.8 | c.6196G>A | p.Val2066Ile | missense_variant | Exon 11 of 27 | 5 | NM_000059.4 | ENSP00000369497.3 | ||
| BRCA2 | ENST00000530893.7 | c.5827G>A | p.Val1943Ile | missense_variant | Exon 11 of 27 | 1 | ENSP00000499438.2 | |||
| BRCA2 | ENST00000614259.2 | n.6196G>A | non_coding_transcript_exon_variant | Exon 10 of 26 | 2 | ENSP00000506251.1 |
Frequencies
GnomAD3 genomes AF: 0.0000329 AC: 5AN: 152194Hom.: 0 Cov.: 33 show subpopulations
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1460522Hom.: 0 Cov.: 45 AF XY: 0.00000138 AC XY: 1AN XY: 726460 show subpopulations
Age Distribution
GnomAD4 genome AF: 0.0000329 AC: 5AN: 152194Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2AN XY: 74356 show subpopulations
ClinVar
Submissions by phenotype
Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:4
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.
This missense variant replaces valine with isoleucine at codon 2066 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 been reported in an individual affected with prostate cancer (PMID: 35666082). A multifactorial analysis using co-occurrence with another pathogenic variant and family history likelihood ratios has determined that this variant is unlikely to be disease-causing (PMID: 31131967). 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.
Hereditary cancer-predisposing syndrome Uncertain:3Benign:1
Missense variant in a coldspot region where missense variants are very unlikely to be pathogenic (PMID:31911673).
The p.V2066I variant (also known as c.6196G>A), located in coding exon 10 of the BRCA2 gene, results from a G to A substitution at nucleotide position 6196. The valine at codon 2066 is replaced by isoleucine, an amino acid with highly similar properties. This alteration was identified amongst a cohort of 427 patients undergoing genetic testing due to a diagnosis of prostate cancer (Giri VN et al. JCO Precis Oncol, 2022 May;6:e2200234). This alteration was classified as likely benign in a multifactorial model of variant interpretation that incorporates co-segregation, family history, co-occurrence and tumor pathology and case-control data (Parsons MT et al. Hum Mutat, 2019 09;40:1557-1578). 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 alteration remains unclear.
This missense variant replaces valine with isoleucine at codon 2066 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 been reported in an individual affected with prostate cancer (PMID: 35666082). A multifactorial analysis using co-occurrence with another pathogenic variant and family history likelihood ratios has determined that this variant is unlikely to be disease-causing (PMID: 31131967). 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.
not provided Uncertain:1Benign:1
Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 26155992, 31131967)
not specified Uncertain:1
Variant summary: BRCA2 c.6196G>A (p.Val2066Ile) results in a conservative amino acid change located in the BRCA2 repeat region (IPR002093) of the encoded protein sequence. 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. The variant was absent in 250212 control chromosomes. c.6196G>A has been reported in an individual with prostate cancer, however without strong evidence for causality (e.g., Giri_2022), as well as detected in a tumor sample from an individual with cervical squamous cell carcinoma, but without corresponding testing of germline DNA and without causative evidence related to the disease (e.g., Muller_2015). These reports therefore do not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer Syndrome. Co-occurrences with other pathogenic variant(s) have been reported (BRCA2 c.7558C>T, p.Arg2520X), providing supporting evidence for a benign role. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. A recent multifactorial likelihood analysis predicted this variant to be likely benign (Parsons_2019). The following publications have been ascertained in the context of this evaluation (PMID: 31294896, 35666082, 26155992, 31112341, 31131967). ClinVar contains an entry for this variant (Variation ID: 38024). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic.
Medulloblastoma;C0346153:Familial cancer of breast;C1838457:Fanconi anemia complementation group D1;C2675520:Breast-ovarian cancer, familial, susceptibility to, 2;C2751641:Glioma susceptibility 3;C2931456:Familial prostate cancer;C3150546:Pancreatic cancer, susceptibility to, 2;CN033288:Wilms tumor 1 Uncertain:1
Hereditary breast ovarian cancer syndrome Benign:1
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at