17-35119118-G-C
Variant summary
Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP3BP6BS2
The NM_002878.4(RAD51D):c.137C>G(p.Ser46Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000105 in 1,613,388 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Consequence
NM_002878.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -4 ACMG points.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
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RAD51D | ENST00000345365.11 | c.137C>G | p.Ser46Cys | missense_variant | Exon 2 of 10 | 1 | NM_002878.4 | ENSP00000338790.6 | ||
ENSG00000267618 | ENST00000593039.5 | c.3+2173C>G | intron_variant | Intron 1 of 6 | 2 | ENSP00000466834.1 |
Frequencies
GnomAD3 genomes AF: 0.0000986 AC: 15AN: 152190Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000756 AC: 19AN: 251312Hom.: 0 AF XY: 0.0000589 AC XY: 8AN XY: 135854
GnomAD4 exome AF: 0.000105 AC: 154AN: 1461198Hom.: 0 Cov.: 31 AF XY: 0.0000949 AC XY: 69AN XY: 726940
GnomAD4 genome AF: 0.0000986 AC: 15AN: 152190Hom.: 0 Cov.: 32 AF XY: 0.0000672 AC XY: 5AN XY: 74356
ClinVar
Submissions by phenotype
Breast-ovarian cancer, familial, susceptibility to, 4 Uncertain:5
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This variant is classified as a variant of uncertain significance as there is insufficient evidence to determine its impact on protein function and/or cancer risk. -
This sequence change replaces serine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 46 of the RAD51D protein (p.Ser46Cys). This variant is present in population databases (rs587780102, gnomAD 0.02%). This missense change has been observed in individual(s) with breast cancer, multiple adenomatous polyps, and/or ovarian cancer (PMID: 22986143, 25938944, 27616075, 32522261, 33630411, 35565380). ClinVar contains an entry for this variant (Variation ID: 127882). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Experimental studies have shown that this missense change affects RAD51D function (PMID: 35565380). 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. -
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not provided Uncertain:4
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Published functional studies demonstrates a damaging effect: decrease in protein stability resulting in defective homology directed repair activity (PMID: 35565380); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22986143, 27616075, 21822267, 25938944, 35565380, 32522261, 34923718, 33630411, 33471991, 36315097, 35264596, 21111057, 35534704) -
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The RAD51D c.137C>G (p.Ser46Cys) variant has been reported in the published literature in individuals with breast and/or ovarian cancer (PMIDs: 35264596 (2022), 35565380 (2022), 33471991 (2021) see also LOVD (https://databases.lovd.nl/shared/variants/RAD51D), 27616075 (2016), 21822267 (2011), 22986143 (2012)), Lynch syndrome (PMID: 33630411 (2021)), and colorectal cancer (PMID: 25938944 (2015)). Additionally, the variant has been reported in reportedly healthy individuals (PMIDs: 33471991 (2021) see also LOVD (https://databases.lovd.nl/shared/variants/RAD51D), 22986143 (2012)). One experimental study reports the variant impacts proper RAD51D function, however further studies are needed to determine the global impact of this variant (PMID: 35565380 (2022)). The frequency of this variant in the general population, 0.00013 (17/129118 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded a prediction that this variant is damaging. Based on the available information, we are unable to determine the clinical significance of this variant. -
not specified Uncertain:3
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Variant summary: RAD51D c.137C>G (p.Ser46Cys) results in a non-conservative amino acid change located in the RAD51D, N-terminal domain (IPR048943) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 7.6e-05 in 251312 control chromosomes (gnomAD). This frequency is not significantly higher than estimated for a pathogenic variant in RAD51D causing Hereditary Breast And Ovarian Cancer Syndrome (7.6e-05 vs 0.00013), allowing no conclusion about variant significance. The variant was found in the FLOSSIES database in two European women older than age 70 years who have never had cancer. c.137C>G has been reported in the literature in individuals affected with Breast, Ovarian and Colorectal Cancer (Alenezi_2022, Kraus_2017, Wickramanayake_2012, Loveday_2011, Weren_2015, Velazquez_2020, Guindalini_2022, de Oliveira_2022). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast And Ovarian Cancer Syndrome. Co-occurrence with a pathogenic variant has been reported in a Lynch Syndrome case (MSH2 c.2459-1G>C, Ferrer-Avargues_2021). At least one publication reports experimental evidence evaluating an impact on protein function, suggesting impaired homologous recombination functionality (Alenezi_2022). The following publications have been ascertained in the context of this evaluation (PMID: 35565380, 33630411, 35264596, 27616075, 21822267, 32522261, 25938944, 22986143, 35534704). 11 submitters have cited clinical-significance assessments for this variant to ClinVar after 2014 and classified this variant as uncertain significance (n=10) and likely benign (n=1). Based on the evidence outlined above, the variant was classified as uncertain significance. -
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Hereditary cancer-predisposing syndrome Uncertain:2Benign:1
This alteration is classified as likely 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. -
This missense variant replaces serine with cysteine at codon 46 of the RAD51D protein. Computational prediction suggests that this variant may not impact protein structure and function. Functional studies have shown that this variant reduced protein expression, affected protein stability, and conferred sensitivity to olaparib and talazoparib (PMID: 35565380). This variant has been reported in individuals affected with ovarian cancer (PMID: 21822267, 22986143, 35565380), individuals affected with breast cancer (PMID: 27616075, 35264596, 36315097), an individual affected with hereditary breast cancer, ovarian cancer, and/or colorectal cancer (PMID: 32522261), an individual affected with multiple colonic adenomas (PMID: 25938944), an individual affected with Lynch syndrome who also carried a pathogenic variant in MSH2 (PMID: 33630411), and an individual with no personal history of cancer (PMID: 35534704). In an international breast cancer case-control meta-analysis, this variant was detected in 3/60466 cases and 1/53461 unaffected controls (PMID: 33471991). This variant has been identified in 22/282706 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. -
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Breast and/or ovarian cancer Uncertain:1
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Malignant tumor of breast Uncertain:1
The RAD51D p.Ser46Cys variant was identified in 1 of 1172 proband chromosomes (frequency: 0.0009) from individuals or families with unselected ovarian cancer or at high risk of breast cancer (and negative for breast and ovarian cancer genes); it was identified in an ovarian cancer case (Wickramanayake 2012). The variant was also identified in dbSNP (ID: rs587780102) “With Uncertain significance allele”, ClinVar (classified uncertain significance by GeneDx, Ambry Genetics, Invitae, ARUP Laboratories and Color Genomics Inc), and Clinvitae (3x), but was not identified in Cosmic and LOVD 3.0. The variant was identified in control databases in 25 of 276898 chromosomes at a frequency of 0.00009 (Genome Aggregation Database Feb 27, 2017). It was observed in the following populations: “Other” in 1 of 6464 chromosomes (freq: 0.0002), Latino in 4 of 34418 chromosomes (freq: 0.0001) and European Non-Finnish in 20 of 126540 chromosomes (freq: 0.0002); but not in the African, Ashkenazi Jewish, East Asian, European Finnish, and South Asian populations. The p.Ser46 residue is conserved in mammals but not in more distantly related organisms, and four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the Cys variant may impact the protein; however, this information is not predictive enough to assume 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 the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -
Hereditary cancer Benign:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at