ClinVar Miner

Submissions for variant NM_007294.4(BRCA1):c.5123C>T (p.Ala1708Val)

gnomAD frequency: 0.00008  dbSNP: rs28897696
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Total submissions: 19
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV000048803 SCV000076816 uncertain significance Hereditary breast ovarian cancer syndrome 2023-12-15 criteria provided, single submitter clinical testing This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1708 of the BRCA1 protein (p.Ala1708Val). This variant is present in population databases (rs28897696, gnomAD 0.03%). This missense change has been observed in individual(s) with a personal and/or family history of breast cancer and/or kidney cancer (PMID: 16489001, 18036263, 22034289, 26287763, 26689913, 27495310). This variant is also known as 5242C>T (A1708V). ClinVar contains an entry for this variant (Variation ID: 37640). Advanced modeling performed at Invitae incorporating data from internal and/or published experimental studies (PMID: 30209399) indicates that this missense variant is not expected to disrupt BRCA1 function with a negative predictive value of 95%. Experimental studies are conflicting or provide insufficient evidence to determine the effect of this variant on BRCA1 function (PMID: 18036263, 20516115, 26689913, 30209399). This variant disrupts the p.Ala1708 amino acid residue in BRCA1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 1157798, 11802208, 15923272, 19404736, 23867111). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.
Ambry Genetics RCV000131166 SCV000186111 uncertain significance Hereditary cancer-predisposing syndrome 2023-04-26 criteria provided, single submitter clinical testing The p.A1708V variant (also known as c.5123C>T), located in coding exon 16 of the BRCA1 gene, results from a C to T substitution at nucleotide position 5123. The alanine at codon 1708 is replaced by valine, an amino acid with similar properties. This alteration impacts the functionally important BRCT domain and has been associated with reduced/partial BRCA1 function, suggesting that p.A1708V may act as a low or moderate disease risk allele (Lu C et al. Nat Commun. 2015 Dec;6:10086; Lee MS et al. Cancer Res. 2010 Jun;70:4880-90; Lovelock PK et al. Breast Cancer Res. 2007;9:R82). Based on one functional study, using saturation genome editing, this alteration does not affect the BRCA1 protein (Findlay GM et al. Nature. 2018 10;562:217-222). Of note, this alteration is also known as 5242C>T in published literature. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence conflicting at this time, the clinical significance of this alteration remains unclear.
GeneDx RCV000589633 SCV000210201 uncertain significance not provided 2023-09-26 criteria provided, single submitter clinical testing Published functional studies showed mixed results with respect to folding ability, binding activity and specificity, homologous recombination repair activity, transcriptional activation, centrosome amplification, foci formation in response to DNA damage, and cell survival (Lovelock et al., 2007; Lee et al., 2010; Lu et al., 2015; Woods et al., 2016; Findlay et al., 2018; Langerud et al., 2018; Fernandes et al., 2019; Petitalot et al., 2019; Iversen et al., 2022; Bassi et al., 2023); Observed in individuals with a personal and/or family history of breast and other cancers (Chenevix-Trench et al., 2006; Fackenthal et al., 2012; Lu et al., 2015; Pal et al., 2015; Zhang et al., 2022; Rioki et al., 2023); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Also known as 5242C>T; This variant is associated with the following publications: (PMID: 24607278, 22889855, 17403394, 26689913, 26287763, 30263132, 29625052, 16489001, 18036263, 20516115, 22034289, 25637381, 20522429, 15744030, 12161611, 24055113, 28024868, 27720647, 27495310, 28781887, 30209399, 30458859, 30765603, 23867111, 21702907, 15923272, 11802208, 31409081, 30257991, 30678073, 32377563, 25348405, 35665744, 37085799, 35918668, 36451132, 34621001, 37719058, 1157798, 34981296)
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV000212194 SCV000494396 uncertain significance not specified 2023-12-28 criteria provided, single submitter clinical testing Variant summary: BRCA1 c.5123C>T (p.Ala1708Val) results in a non-conservative amino acid change located in the BRCT domain (IPR001357) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 2.8e-05 in 251672 control chromosomes (gnomAD). Another BRCA1 missense change at the same residue p.Ala1708Glu (c.5123C>A) is a known pathogenic variant. It must be noted that while p.Ala1708Glu leads to change in amino acid charge (neutral to polar), this variant, (p.Ala1708Val) does not. c.5123C>T has been reported in the literature in individuals affected with breast and/or ovarian and other cancers (example: Caldes_2002, Chenevix-Trench_2006, Lovelock_2007, Fackenthal_2012, Lu_2015, Pal_2015, Jarhelle_2016, Moller_2019, Zhang_2022, Yang_2022). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. This variant was also reported in the FLOSSIES database in women older than age 70 years who have never had cancer. Co-occurrences with pathogenic BRCA2 variants have been observed at our laboratory (c.5641_5644delAAAT, p.Lys1881GlnfsX27; c.8188G>C, p.Ala2730Pro; c.3939_3943delCAAGA, p.Y1313X), while an additional non-specified BRCA2 co-occurrence has been reported by an external laboratory in the ClinVar database (SCV000076816.10), providing supporting evidence for a benign role. Multiple publications have reported experimental evidence evaluating an impact on protein function. The most pronounced variant effect leads to varied outcomes depending upon types of assays performed (example, Lovelock_2007, Lee_2008, Lu_2015, Findlay_2018, Fernandes_2019, Petitalot_2019, Bassi_2023). The variant had normal effect on protein expression and foci formation in response to DNA damage, functional homology directed repair (HDR) activity, but had conflicting results ranging from normal to intermediate/strong effect on transcription, protein folding, centrosome amplification and phosphopeptide binding. For these reasons, a recent study reports this variant among those having an intermediate impact (Petitalot_2019). The possibility of the variant being a hypomorphic mildly causative allele associated with a late onset/variable penetrance cannot be ruled out. The following publications have been ascertained in the context of this evaluation (PMID: 30263132, 25637381, 12161611, 16489001, 24055113, 22034289, 30765603, 30209399, 21702907, 29625052, 27495310, 30458859, 20516115, 15744030, 18036263, 26689913, 30678073, 26287763, 30257991, 17403394, 22889855, 28781887, 11802208, 35918668, 35918668, 37085799).Ten ClinVar submitters have assessed this variant since 2014: all submitters classified the variant as uncertain significance. Some submitters cite overlapping but not identical evidence utilized in the context of this evaluation. Based on the evidence outlined above, the variant was classified as uncertain significance.
Color Diagnostics, LLC DBA Color Health RCV000131166 SCV000688538 uncertain significance Hereditary cancer-predisposing syndrome 2024-01-18 criteria provided, single submitter clinical testing This missense variant replaces alanine with valine at codon 1708 of the BRCA1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function. Functional studies have reported conflicting findings on the activity of the variant protein on various in vitro and ex vivo assays (PMID: 18036263, 20516115, 26689913, 30209399, 30458859). This variant has been reported in individuals with personal and/or family history of breast or ovarian cancer (PMID: 15744030, 16489001, 17403394, 22034289, 26287763, 27495310) including individuals who also had a BRCA2 pathogenic co-variant (PMID: 15744030, 17403394) and in healthy controls (PMID: 15744030, 24055113, 25637381). This variant has also been reported in an individual affected with kidney renal clear cell carcinoma (PMID: 26689913). A different variant affecting the same codon (p.Ala1708Glu) is considered to be disease-causing (ClinVar variation ID: 55407), suggesting that alanine or similar amino acid at this position is important for the protein function. This variant has been identified in 8/282694 chromosomes 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.
St. Jude Molecular Pathology, St. Jude Children's Research Hospital RCV000048803 SCV000891002 uncertain significance Hereditary breast ovarian cancer syndrome 2021-08-04 criteria provided, single submitter clinical testing
Quest Diagnostics Nichols Institute San Juan Capistrano RCV000589633 SCV001133610 uncertain significance not provided 2023-01-27 criteria provided, single submitter clinical testing The frequency of this variant in the general population, 0.00028 (7/24954 chromosomes in African/African American subpopulation, http://gnomad.broadinstitute.org), is higher than would generally be expected for pathogenic variants in this gene. In the published literature, the variant has been reported in individuals affected with breast cancer (PMID: 17403394 (2007), 22034289 (2012), 26287763 (2015), 27495310 (2016), and kidney cancer (PMID: 26689913 (2015), 29625052 (2018)). Assessment of experimental analysis yielded conflicting results regarding the impact of this variant on protein function (PMID: 18036263 (2007), 20516115 (2010), 22889855 (2012), 26689913 (2015), 30209399 (2018), 30458859 (2018), 30257991 (2018)). 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 damaging. Based on the available information, we are unable to determine the clinical significance of this variant.
Institute of Human Genetics, University of Leipzig Medical Center RCV000031221 SCV001429075 uncertain significance Breast-ovarian cancer, familial, susceptibility to, 1 2018-07-09 criteria provided, single submitter clinical testing
Genetic Services Laboratory, University of Chicago RCV000212194 SCV002064591 uncertain significance not specified 2020-06-09 criteria provided, single submitter clinical testing DNA sequence analysis of the BRCA1 gene demonstrated a sequence change, c.5123C>T, in exon 17 that results in an amino acid change, p.Ala1708Val. This sequence change has been described in patients with a personal and/or family history of breast cancer, as well as in control populations undergoing exome sequencing (PMIDs: 25637381, 24055113). PMID 20516115 demonstrated a severe folding defect and compromised binding activity and binding specificity associated with the p.Ala1708Val change. However, PMID 18036263 demonstrated an intermediate effect on transcriptional transactivation associated with the p.Ala1708Val change, more suggestive of a low or moderate risk allele. This sequence change has been described in the gnomAD database with a low population frequency of 0.03% (dbSNP rs28897696). The p.Ala1708Val change affects a highly conserved amino acid residue located in a domain of the BRCA1 protein that is known to be functional. The p.Ala1708Val substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). Due to these contrasting evidences and the lack of functional studies, the clinical significance of the p.Ala1708Val change remains unknown at this time.
Sema4, Sema4 RCV000131166 SCV002537814 uncertain significance Hereditary cancer-predisposing syndrome 2021-06-15 criteria provided, single submitter curation
Baylor Genetics RCV000031221 SCV004212680 uncertain significance Breast-ovarian cancer, familial, susceptibility to, 1 2023-10-24 criteria provided, single submitter clinical testing
Sharing Clinical Reports Project (SCRP) RCV000031221 SCV000053821 uncertain significance Breast-ovarian cancer, familial, susceptibility to, 1 2012-05-01 no assertion criteria provided clinical testing
CSER _CC_NCGL, University of Washington RCV000148393 SCV000190092 uncertain significance Breast and/or ovarian cancer 2014-06-01 no assertion criteria provided research
Department of Medical Genetics, University Hospital of North Norway RCV000031221 SCV000301438 uncertain significance Breast-ovarian cancer, familial, susceptibility to, 1 2016-05-01 no assertion criteria provided clinical testing
Research Molecular Genetics Laboratory, Women's College Hospital, University of Toronto RCV000212194 SCV000587467 uncertain significance not specified 2014-01-31 no assertion criteria provided research
Department of Pathology and Laboratory Medicine, Sinai Health System RCV001353479 SCV000591584 uncertain significance Malignant tumor of breast no assertion criteria provided clinical testing The BRCA1 p.Ala1708Val variant was identified in 1 of 2000 proband chromosomes (frequency: 0.001) from individuals or families with breast cancer, and was not identified in 180 control chromosomes from healthy individuals (Dorschner 2013); however, an insufficient number of controls were included in these studies to determine the frequency of this variant in the general population. The variant was also identified in dbSNP (ID: rs28897696) “With Pathogenic, Uncertain significance allele”, NHLBI Exome Sequencing Project (Exome Variant Server), Exome Aggregation Consortium (ExAC) database, HGMD, LOVD, the ClinVar database (classified as a uncertain significance variant by the Sharing Clinical Reports Project, derived from Myriad reports; Ambry Genetics; CSER_CC_NCGL and GeneDX), GeneInsight VariantWire database(1X, classified as “unknown significance” by a clinical laboratory) and UMD (2X as a unknown significance variant).This variant was identified in the HAPMAP-JPT in 1 of 168 chromosomes (frequency: 0.006), Exome Variant Server project in 3 of 13006 European American/African American alleles, the Exome Aggregation Consortium (ExAC) database (released Oct 20th, 2014) in 4 of 10284 chromosomes (frequency: 0.0004) from a population of African individuals, although this low number of observations and low frequency is not substantive enough to determine the prevalence of the variant in the general population and its relationship to disease. The p.Ala1708 residue is conserved across mammals and other organisms, and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the p.Ala1708 variant may impact the protein. However, this information is not predictive enough to assume pathogenicity. Functional studies by Chenevix-Trench (2006) and Lee (2010) characterized the variant as unclassified with odds of 41:1 in favor of causality with strong functional effect. In addition, in the study by Lovelock (2007) this variant displayed an intermediate transcriptional transactivation activity and a normal foci formation response in response to DNA damage but induced centrosome amplification. The results of this study also raise the possibility that variant may be associated with a low or moderate risk of cancer. 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.
Brotman Baty Institute, University of Washington RCV000031221 SCV001242169 not provided Breast-ovarian cancer, familial, susceptibility to, 1 no assertion provided in vitro
Center for Precision Medicine, Meizhou People's Hospital RCV002250480 SCV002520922 uncertain significance Familial cancer of breast no assertion criteria provided literature only
BRCAlab, Lund University RCV000031221 SCV004243947 uncertain significance Breast-ovarian cancer, familial, susceptibility to, 1 2020-03-02 no assertion criteria provided clinical testing

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