rs397507890
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000059.4(BRCA2):c.7004_7007+2del variant causes a splice donor, coding sequence change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. F2335F) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Consequence
BRCA2
NM_000059.4 splice_donor, coding_sequence
NM_000059.4 splice_donor, coding_sequence
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 6.50
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 Pathogenic. Variant got 18 ACMG points.
PVS1
?
Splicing variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 13-32346891-CTTTCGG-C is Pathogenic according to our data. Variant chr13-32346891-CTTTCGG-C is described in ClinVar as [Pathogenic]. Clinvar id is 9317.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
BRCA2 | NM_000059.4 | c.7004_7007+2del | splice_donor_variant, coding_sequence_variant | 13/27 | ENST00000380152.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
BRCA2 | ENST00000380152.8 | c.7004_7007+2del | splice_donor_variant, coding_sequence_variant | 13/27 | 5 | NM_000059.4 | A2 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
We have no GnomAD4 exomes data on this position. Probably position not covered by the project.
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Breast-ovarian cancer, familial, susceptibility to, 2 Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Dec 21, 1995 | - - |
Hereditary cancer-predisposing syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | May 07, 2020 | The c.7004_7007+2delTTCGGT pathogenic mutation located in the BRCA2 gene, is caused by the deletion of the last four nucleotides of coding exon 12 as well as the first two intronic nucleotides downstream of this coding exon, causing a disruption of the canonical splice donor site. This alteration was identified in an HBOC family and segregated strongly with breast cancer in that family (Wooster et al. Nature. 1996 Dec;378(6559):789-92). RNA studies have demonstrated that this alteration results in abnormal splicing in the set of samples tested (Ambry internal data). As such, this alteration is classified as a disease-causing mutation. - |
Hereditary breast ovarian cancer syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jun 30, 2022 | For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 9317). This variant has been observed in individual(s) with breast cancer (PMID: 8524414, 21394826, 22505045). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This variant results in the deletion of part of exon 13 of the BRCA2 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in BRCA2 are known to be pathogenic (PMID: 20104584). - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at