chr17-43093073-T-C
Variant summary
Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2
The NM_007294.4(BRCA1):c.2458A>G(p.Lys820Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00169 in 1,613,798 control chromosomes in the GnomAD database, including 33 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K820N) has been classified as Uncertain significance.
Frequency
Consequence
NM_007294.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -20 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
BRCA1 | NM_007294.4 | c.2458A>G | p.Lys820Glu | missense_variant | 10/23 | ENST00000357654.9 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
BRCA1 | ENST00000357654.9 | c.2458A>G | p.Lys820Glu | missense_variant | 10/23 | 1 | NM_007294.4 | P4 |
Frequencies
GnomAD3 genomes AF: 0.00889 AC: 1353AN: 152212Hom.: 19 Cov.: 32
GnomAD3 exomes AF: 0.00240 AC: 602AN: 250740Hom.: 9 AF XY: 0.00173 AC XY: 235AN XY: 135552
GnomAD4 exome AF: 0.000937 AC: 1369AN: 1461468Hom.: 14 Cov.: 41 AF XY: 0.000818 AC XY: 595AN XY: 727054
GnomAD4 genome AF: 0.00890 AC: 1356AN: 152330Hom.: 19 Cov.: 32 AF XY: 0.00871 AC XY: 649AN XY: 74500
ClinVar
Submissions by phenotype
not specified Benign:8Other:1
Benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | - | - - |
Benign, criteria provided, single submitter | clinical testing | Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia | Jul 27, 2015 | - - |
Benign, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Jul 01, 2014 | - - |
not provided, no classification provided | reference population | ITMI | Sep 19, 2013 | - - |
Benign, no assertion criteria provided | clinical testing | Department of Pathology and Laboratory Medicine, Sinai Health System | - | The p.Lys820Glu variant has been identified in 7 of 4428 proband chromosomes (frequency 0.002) in individuals with breast or ovarian cancers (Capanu 2011, Fackenthal 2005, Jalkh 2012); however control chromosomes from healthy individuals were not included in these studies. This variant was identified in dbSNP (rs56082113) and with a frequency of 3% in the African American population from the Exome Variant Server. The variant was also reported 30x in BIC as a variant of unknown clinical importance, and 10x in the UMD as a neutral variant which co-occurred with a known BRCA1 pathogenic mutation (c.3607C>T (p.Arg1203X)). The p.Lys820 residue is not conserved in evolution and the variant amino acid (Glu) is present in macaque and opossum. Furthermore, computational analyses (PolyPhen2, SIFT, AlignGVGD) do not suggest a high likelihood of impact to the protein, and two in silico studies have concluded this variant to be neutral or of little clinical significance (Lindor 2012, Tavtigian 2006); however, this information is not predictive enough to rule out pathogenicity. In summary, based on the above information, the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as benign. - |
Benign, no assertion criteria provided | clinical testing | Clinical Genetics Laboratory, Department of Pathology, Netherlands Cancer Institute | - | - - |
Benign, criteria provided, single submitter | clinical testing | Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital | Aug 15, 2023 | - - |
Benign, no assertion criteria provided | clinical testing | Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+ | - | - - |
Benign, criteria provided, single submitter | clinical testing | GeneKor MSA | Nov 01, 2017 | - - |
Breast-ovarian cancer, familial, susceptibility to, 1 Uncertain:1Benign:7
Uncertain significance, no assertion criteria provided | clinical testing | Breast Cancer Information Core (BIC) (BRCA1) | May 29, 2002 | - - |
Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 13, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. - |
Likely benign, no assertion criteria provided | literature only | Pathway Genomics | Jul 24, 2014 | - - |
Benign, criteria provided, single submitter | literature only | Counsyl | Feb 14, 2014 | - - |
Benign, reviewed by expert panel | curation | Evidence-based Network for the Interpretation of Germline Mutant Alleles (ENIGMA) | Aug 10, 2015 | IARC class based on posterior probability from multifactorial likelihood analysis, thresholds for class as per Plon et al. 2008 (PMID: 18951446). Class 1 based on posterior probability = 0.00000000000204. Also class 1 based on frequency >1% in an outbred sampleset. Frequency 0.06098 (African), derived from 1000 genomes (2012-04-30). - |
Benign, criteria provided, single submitter | clinical testing | Michigan Medical Genetics Laboratories, University of Michigan | Nov 03, 2014 | - - |
Benign, criteria provided, single submitter | clinical testing | Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center | Sep 21, 2015 | - - |
Benign, criteria provided, single submitter | clinical testing | KCCC/NGS Laboratory, Kuwait Cancer Control Center | Jul 07, 2023 | - - |
Hereditary cancer-predisposing syndrome Benign:5
Benign, criteria provided, single submitter | curation | Sema4, Sema4 | Apr 17, 2020 | - - |
Benign, criteria provided, single submitter | clinical testing | Ambry Genetics | Nov 18, 2014 | This alteration is classified as 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. - |
Likely benign, criteria provided, single submitter | clinical testing | Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C. | May 23, 2018 | - - |
Likely benign, criteria provided, single submitter | clinical testing | Vantari Genetics | Jan 05, 2016 | - - |
Benign, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Dec 06, 2014 | - - |
Hereditary breast ovarian cancer syndrome Benign:5
Benign, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Feb 12, 2014 | - - |
Benign, criteria provided, single submitter | clinical testing | Invitae | Feb 01, 2024 | - - |
Likely benign, criteria provided, single submitter | clinical testing | Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C. | Feb 14, 2017 | - - |
Benign, criteria provided, single submitter | clinical testing | National Health Laboratory Service, Universitas Academic Hospital and University of the Free State | Apr 19, 2022 | - - |
Benign, criteria provided, single submitter | research | Genetics Program, Instituto Nacional de Cancer | Nov 01, 2021 | - - |
not provided Benign:4
Likely benign, no assertion criteria provided | clinical testing | Mayo Clinic Laboratories, Mayo Clinic | Feb 19, 2018 | - - |
Benign, criteria provided, single submitter | clinical testing | ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories | Nov 16, 2023 | - - |
Benign, no assertion criteria provided | research | Biesecker Lab/Clinical Genomics Section, National Institutes of Health | Jul 13, 2012 | - - |
Benign, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | May 01, 2024 | BRCA1: BP4, BS1, BS2 - |
Breast and/or ovarian cancer Benign:1
Benign, no assertion criteria provided | clinical testing | Foulkes Cancer Genetics LDI, Lady Davis Institute for Medical Research | Apr 23, 2013 | - - |
Familial cancer of breast;C2676676:Breast-ovarian cancer, familial, susceptibility to, 1;C3280442:Pancreatic cancer, susceptibility to, 4;C4554406:Fanconi anemia, complementation group S Benign:1
Benign, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Aug 04, 2021 | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at