chr13-32398735-A-T
Variant names:
Variant summary
Our verdict is Likely benign. Variant got -6 ACMG points: 2P and 8B. PVS1_ModerateBP6_Very_Strong
The NM_000059.4(BRCA2):c.10222A>T(p.Lys3408*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000173 in 1,613,940 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).
Frequency
Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000016 ( 0 hom. )
Consequence
BRCA2
NM_000059.4 stop_gained
NM_000059.4 stop_gained
Scores
2
5
Clinical Significance
Conservation
PhyloP100: -0.805
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 Likely_benign. Variant got -6 ACMG points.
PVS1
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.00341 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
BP6
Variant 13-32398735-A-T is Benign according to our data. Variant chr13-32398735-A-T is described in ClinVar as [Likely_benign]. Clinvar id is 51056.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| BRCA2 | ENST00000380152.8 | c.10222A>T | p.Lys3408* | stop_gained | Exon 27 of 27 | 5 | NM_000059.4 | ENSP00000369497.3 | ||
| BRCA2 | ENST00000530893.7 | c.9853A>T | p.Lys3285* | stop_gained | Exon 27 of 27 | 1 | ENSP00000499438.2 | |||
| BRCA2 | ENST00000614259.2 | n.*2280A>T | non_coding_transcript_exon_variant | Exon 26 of 26 | 2 | ENSP00000506251.1 | ||||
| BRCA2 | ENST00000614259.2 | n.*2280A>T | 3_prime_UTR_variant | Exon 26 of 26 | 2 | ENSP00000506251.1 |
Frequencies
GnomAD3 genomes 0.0000263 AC: 4AN: 152220Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251000Hom.: 0 AF XY: 0.00000737 AC XY: 1AN XY: 135680
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GnomAD4 exome AF: 0.0000164 AC: 24AN: 1461720Hom.: 0 Cov.: 31 AF XY: 0.0000193 AC XY: 14AN XY: 727160
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GnomAD4 genome 0.0000263 AC: 4AN: 152220Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1AN XY: 74368
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ClinVar
Significance: Benign/Likely benign
Submissions summary: Uncertain:1Benign:8
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Breast-ovarian cancer, familial, susceptibility to, 2 Uncertain:1Benign:2
| Benign, no assertion criteria provided | clinical testing | Breast Cancer Information Core (BIC) (BRCA2) | - | - - |
| Uncertain significance, no assertion criteria provided | clinical testing | Department of Pathology and Laboratory Medicine, Sinai Health System | - | The p.Lys3408X variant was not identified in the literature but was identified in the BIC database (1X with no clinical importance), dbSNP (ID: rs80358402), and in the ClinVar database (classified as likely benign by GeneDx and Ambry Genetics; classified as benign by BIC; classification not provided by Invitae). The variant was listed in the Exome Aggregation Consortium (ExAC) database in 1 of 65858 chromosomes (frequency: 0.00002) from a population of European (Non-Finnish) individuals; however, this single observation and low frequency is not substantive enough to determine the prevalence of the variant in the general population and its relationship to disease. The variant results in termination of translation at amino acid position 3408 and the loss of the terminal 9 amino acids of the expressed BRCA2 protein. Borg (2010) identified three variants in the BRCA2 gene near the 3’-end which were predicted to result in protein truncation (c.9976A>T (BIC: K3326X), c.10095delCins11 (BIC: 10323delCins11), c.10150C>T (BIC: R3384X), but were “ruled as exceptions that could not be classified because of their location near the 3’-end and possibly dispensable part of the gene”. The p.Lys3408X variant is located even farther downstream than these variants (i.e. closer to the 3’- end of the gene). Stop codon or nonsense mutations in the last exon of a gene may not be subjected to nonsense mediated RNA decay, although further study would be required to validate this hypothesis and it is currently not possible to determine whether or not this might influence the severity of the disorder. Segregation and/or functional studies are recommended to further elucidate the pathogenicity of this variant. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of unknown significance. - |
| Likely benign, criteria provided, single submitter | clinical testing | Counsyl | Apr 05, 2017 | - - |
not provided Benign:2
| Likely benign, criteria provided, single submitter | clinical testing | GeneDx | Jul 25, 2022 | See Variant Classification Assertion Criteria. - |
| Likely benign, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | Jan 17, 2023 | - - |
Hereditary cancer-predisposing syndrome Benign:2
| Likely benign, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Feb 22, 2017 | - - |
| Likely benign, criteria provided, single submitter | clinical testing | Ambry Genetics | Mar 12, 2019 | 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 specified Benign:1
| Likely benign, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jan 30, 2025 | Variant summary: BRCA2 c.10222A>T (p.Lys3408X) results in a premature termination codon, predicted to cause a truncation of the encoded protein but not expected to undergo nonsense mediated decay. The variant allele was found at a frequency of 1.7e-05 in 1613940 control chromosomes (gnomAD). This frequency is not significantly higher than estimated for a pathogenic variant in BRCA2 causing Hereditary Breast and Ovarian Cancer Syndrome (1.7e-05 vs 0.00075), allowing no conclusion about variant significance. c.10222A>T has been reported in the literature in individuals affected with Hereditary Breast and Ovarian Cancer Syndrome without strong evidence for or against pathogenicity (example: Pirim_2020, Darst_2021, Bisgin_2022). These report(s) do not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 32599251, 32853339, 35753294). ClinVar contains an entry for this variant (Variation ID: 51056). Based on the evidence outlined above, the variant was classified as likely benign. - |
Hereditary breast ovarian cancer syndrome Benign:1
| Benign, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 23, 2025 | - - |
Computational scores
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Name
Calibrated prediction
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BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Benign
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
N
Vest4
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at