ClinVar Miner

Submissions for variant NM_007194.4(CHEK2):c.1525C>T (p.Pro509Ser) (rs587780179)

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Total submissions: 10
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000212472 SCV000149913 uncertain significance not provided 2018-06-05 criteria provided, single submitter clinical testing This variant is denoted CHEK2 c.1525C>T at the cDNA level, p.Pro509Ser (P509S) at the protein level, and results in the change of a Proline to a Serine (CCC>TCC). This variant was observed in at least one individual with prostate cancer, one with breast and uterine cancer, and two others with a history of a Lynch syndrome-associated tumor and/or colon polyps (Tischkowitz 2008, Yurgelun 2015, Castellanos 2017). Although this variant was observed in large population cohorts, population data in this region of CHEK2 are not considered reliable due to high pseudogene homology (Lek 2016). This variant is not located in a known functional domain. In-silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect. Based on currently available evidence, it is unclear whether CHEK2 Pro509Ser is a pathogenic or benign variant. We consider it to be a variant of uncertain significance.
Ambry Genetics RCV000116004 SCV000186790 uncertain significance Hereditary cancer-predisposing syndrome 2018-09-14 criteria provided, single submitter clinical testing Insufficient or conflicting evidence
Invitae RCV000200569 SCV000254929 uncertain significance Familial cancer of breast 2019-12-28 criteria provided, single submitter clinical testing This sequence change replaces proline with serine at codon 509 of the CHEK2 protein (p.Pro509Ser). The proline residue is moderately conserved and there is a moderate physicochemical difference between proline and serine. The frequency data for this variant (rs587780179) in the population databases is unreliable, as metrics indicate poor quality at this position in the ExAC database. This variant has been observed in an individual with prostate cancer (PMID: 18571837), an individual with breast, uterine and skin cancers (PMID: 28051113), and individuals with suspected Lynch syndrome (PMID: 25980754). ClinVar contains an entry for this variant (Variation ID: 128063). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: (SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). The serine amino acid residue is also found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies. 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.
Counsyl RCV000200569 SCV000488484 uncertain significance Familial cancer of breast 2016-04-14 criteria provided, single submitter clinical testing
PreventionGenetics,PreventionGenetics RCV000212472 SCV000806873 uncertain significance not provided 2017-02-27 criteria provided, single submitter clinical testing
Mendelics RCV000200569 SCV000839453 uncertain significance Familial cancer of breast 2018-07-02 criteria provided, single submitter clinical testing
Quest Diagnostics Nichols Institute San Juan Capistrano RCV000212472 SCV000888111 uncertain significance not provided 2019-01-30 criteria provided, single submitter clinical testing
Fulgent Genetics,Fulgent Genetics RCV000764368 SCV000895403 uncertain significance Familial cancer of breast; Li-Fraumeni syndrome 2; Osteosarcoma; Malignant tumor of prostate 2018-10-31 criteria provided, single submitter clinical testing
Color RCV000116004 SCV000902768 likely benign Hereditary cancer-predisposing syndrome 2016-03-03 criteria provided, single submitter clinical testing
Integrated Genetics/Laboratory Corporation of America RCV000781300 SCV000919219 uncertain significance not specified 2019-03-21 criteria provided, single submitter clinical testing Variant summary: CHEK2 c.1525C>T (p.Pro509Ser) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 9.5e-05 in 263796 control chromosomes (gnomAD). This frequency is lower than expected for a pathogenic variant in CHEK2 causing Hereditary Breast and Ovarian Cancer (9.5e-05 vs 0.00031), allowing no conclusion about variant significance. c.1525C>T has been reported in the literature in individuals affected with various tumor phenotypes (Castellanos 2015, Yurgelun 2015, Tischkowitz 2008). These reports do not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer. At least one publication reported experimental evidence evaluating an impact on protein function, demonstrating decreased function in a yeast based DNA-damage assay that indicated an intermediate functionality for the variant (Delimitsou 2019). Seven clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance.

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