chr17-58720767-A-G
Variant summary
Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2
The NM_058216.3(RAD51C):c.859A>G(p.Thr287Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0088 in 1,612,322 control chromosomes in the GnomAD database, including 80 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).
Frequency
Consequence
NM_058216.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -20 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes AF: 0.00631 AC: 961AN: 152196Hom.: 3 Cov.: 31
GnomAD3 exomes AF: 0.00560 AC: 1407AN: 251152Hom.: 6 AF XY: 0.00548 AC XY: 744AN XY: 135772
GnomAD4 exome AF: 0.00907 AC: 13236AN: 1460008Hom.: 77 Cov.: 30 AF XY: 0.00876 AC XY: 6361AN XY: 726460
GnomAD4 genome AF: 0.00630 AC: 960AN: 152314Hom.: 3 Cov.: 31 AF XY: 0.00565 AC XY: 421AN XY: 74482
ClinVar
Submissions by phenotype
not provided Benign:9
Variant summary: The RAD51C c.859A>G (p.Thr287Ala) variant involves the alteration of a conserved nucleotide. 4/4 in silico tools predict a damaging outcome for this variant (SNPs&GO not captured due to low reliability index). This variant was found in 693/126274 control chromosomes (3 homozygotes) at a frequency of 0.0054881, which is approximately 88 times the estimated maximal expected allele frequency of a pathogenic RAD51C variant (0.0000625), suggesting this variant is likely a benign polymorphism. This variant has been reported in multiple cancer patients (including BrC, OvC, PcC) and some studies reported comparable frequencies of variant in case and controls. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as benign, without evidence to independently evaluate. Complementation assays of T287A have shown that a normal number of RAD51C foci are formed. Cells survival is reduced by ~36% in chicken DT40 cells, which may not be replicated in mammalian cells or associated with the pathology of HBOC (Meindl_2010). Considering all evidence, this variant is classified as benign. -
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RAD51C: BS1, BS2 -
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not specified Benign:7
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This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
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Hereditary cancer-predisposing syndrome Benign:4
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. -
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Fanconi anemia complementation group O Benign:3
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Breast-ovarian cancer, familial, susceptibility to, 3 Benign:3
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This variant is considered benign. This variant has been observed at a population frequency that is significantly greater than expected given the associated disease prevalence and penetrance. This variant is strongly associated with less severe personal and family histories of cancer, typical for individuals without pathogenic variants in this gene [PMID: 25085752]. -
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Breast and/or ovarian cancer Benign:1
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Fanconi anemia Benign:1
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RAD51C-related disorder Benign:1
This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -
Malignant tumor of breast Benign:1
The RAD51C p.Thr287Ala variant was identified in 57 of 8266 proband chromosomes (frequency: 0.007) from Australian, British, German, American, Jewish and Other individuals or families with non- BRCA1/BRCA2 (high risk or familial) breast and/or ovarian cancer and was identified in 35 of 6604 control chromosomes (frequency: 0.005) from healthy individuals (Thompson 2012, Neidhardt 2017, Meindl 2009, Lu 2012, Clague 2011, Kushnir 2012, Leeneer 2012, Lu 2012). Three groups assessed RAD51C protein function for this variant, genomic stability and homologous recombination through functional assays and found that the variant is hypomorphic (Meindl 2009, Somyajit 2012, Clague 2011). However, complementation studies of this variant with a mutant RAD51C human fibroblast cell line demonstrated correction of the phenotype. The variant was also identified in dbSNP (ID: rs28363317) as “Other”, ClinVar (classified benign by Invitae, GeneDx, Ambry Genetics, Children's Hospital of Philadelphia, Color Genomics; and likely benign by Illumina, Counsyl, Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics), and LOVD 3.0 (9X); but was not identified in Clinvitae, Cosmic, and MutDB databases. The variant was identified in control databases in 1542 (6 homozygous) of 276966 chromosomes at a frequency of 0.006 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Consortium Feb 27, 2017)". The p.Thr287Ala residue is conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing. In summary, based on the above information this variant meets our laboratory's criteria to be classified as benign. -
Breast and Ovarian Cancer Susceptibility Benign:1
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Hereditary breast ovarian cancer syndrome Benign:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at