ClinVar Miner

Submissions for variant NM_000059.4(BRCA2):c.6866T>G (p.Leu2289Ter)

dbSNP: rs1555285146
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Color Diagnostics, LLC DBA Color Health RCV000583617 SCV000689006 likely pathogenic Hereditary cancer-predisposing syndrome 2020-04-28 criteria provided, single submitter clinical testing This variant alters 1 nucleotide in exon 12 of the BRCA2 gene, creating a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. Loss of BRCA2 function is a known mechanism of disease. This variant has been reported in an individual affected with breast cancer (PMID: 28831036). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). It has been shown that a transcript lacking exon 12 (delEx12) is detected at low levels (10-20%) in healthy individuals (PMID: 19795481, 32046981). This delEx12 transcript has shown varying levels of BRCA2 activity in BRCA2-null mouse embryonic stem cells (PMID: 19795481, 32046981). Of note, two of 11 truncation variants occurring in exon 12 have been shown to increase the delEx12 transcript levels to ~50% of total transcripts in the cells derived from two carriers (PMID: 32046981). However, family studies did not show a correlation of this observation with clinical outcome, and the delEx12 transcript-inducing variants were observed in multiple individuals affected with breast cancer (PMID: 32046981). In summary, limited data suggest that the deleterious effects of certain truncation variants occurring in exon 12 may be alleviated due to the induction of delEx12 transcript. However, the clinical relevance of this observation is not clearly established. Although additional studies are necessary to determine the role of this c.6849del variant in disease conclusively, the available evidence indicates that this variant is likely to result in the loss of BRCA2 function. Therefore, this variant is classified as Likely Pathogenic.
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV001584400 SCV001821480 likely pathogenic Hereditary breast ovarian cancer syndrome 2021-08-09 criteria provided, single submitter clinical testing Variant summary: BRCA2 c.6866T>G (p.Leu2289X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 248798 control chromosomes (gnomAD). To our knowledge, no occurrence of c.6866T>G in individuals affected with Hereditary Breast And Ovarian Cancer Syndrome and no experimental evidence demonstrating its impact on protein function have been reported. One ClinVar submitter (evaluation after 2014) cites the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic.
Ambry Genetics RCV000583617 SCV002667650 uncertain significance Hereditary cancer-predisposing syndrome 2018-10-03 criteria provided, single submitter clinical testing The p.L2289* variant (also known as c.6866T>G), located in coding exon 11 of the BRCA2 gene, results from a T to G substitution at nucleotide position 6866. This changes the amino acid from a leucine to a stop codon within coding exon 11 (also known as exon 12) which is skipped in one of the natural in-frame minor isoforms expressed in normal individuals (known in the literature as BRCA2 delta 12) (Fackenthal J et al. J Med Genet. 2016 Aug; 53(8):548-58). In one study, BRCA2 exon 12 has been shown to be functionally redundant using mouse embryonic stem cells (Li L et al. Hum Mutat. 2009 Nov; 30(11):1543-50). Although alterations that result in premature protein truncation are typically deleterious in nature, protein truncating alterations that occur in exons that are skipped in naturally occurring in-frame minor isoforms have an uncertain impact on pathogenicity since it is possible that the naturally occurring isoform that lacks coding exon 11 may be partially functional. As such, the clinical significance of this alteration remains unclear.

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