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    1. Functional and Clinical Characterization of Variants of Uncertain Significance Identifies a Hotspot for Inactivating Missense Variants in RAD51C

      [Paper-level Aggregated] PMCID: PMC10390864

      Evidence Type(s): Functional, Oncogenic, Predictive, Prognostic

      Justification: Functional: The study assessed the influence of various RAD51C missense mutations on HDR DNA repair activity, categorizing them as deleterious, hypomorphic, or neutral based on their effects on HDR scores, indicating their functional impact on DNA repair mechanisms. Oncogenic: The loss of RAD51C function promotes HR deficiency and sensitizes cells to cisplatin and olaparib, suggesting that variants affecting RAD51C function may contribute to oncogenic processes by impairing DNA repair and influencing drug sensitivity in cancer cells. Predictive: The study evaluated the sensitivity of cells with different RAD51C variants to cisplatin and olaparib, indicating that specific variants can predict responses to these drugs, which is crucial for therapeutic decision-making in cancer treatment. Prognostic: The correlation between RAD51C variant status and drug response (IC50 values) suggests that these variants may serve as prognostic markers for treatment outcomes in patients receiving cisplatin or olaparib.

      Gene→Variant (gene-first): RAD51C(5889):16 A RAD51C(5889):C135Y RAD51C(5889):E94K RAD51C(5889):G130R RAD51C(5889):G302V RAD51C(5889):K131 RAD51C(5889):L138F RAD51C(5889):P21S RAD51C(5889):Q133E RAD51C(5889):R168 RAD51C(5889):R168G RAD51C(5889):R312 RAD51C(5889):R312W RAD51C(5889):T132I RAD51C(5889):T132R RAD51D(5892):T86I RAD51C(5889):V140E RAD51C(5889):p.Cys135Tyr RAD51C(5889):p.Thr132Ile RAD51C(5889):p.Val140Glu RAD51C(5889):A126T RAD51C(5889):D159N RAD51C(5889):G125V RAD51C(5889):G153D RAD51C(5889):G264S RAD51C(5889):G264V RAD51C(5889):G3R RAD51C(5889):L219S RAD51C(5889):Q143R RAD51C(5889):R214C RAD51C(5889):R258H RAD51C(5889):R366Q RAD51C(5889):T287A RAD51C(5889):V169A RAD51C(5889):p.Arg214Cys RAD51C(5889):p.Arg258His RAD51C(5889):p.Arg312Trp RAD51C(5889):p.Arg366Gln RAD51C(5889):p.Asp159Asn RAD51C(5889):p.Gln143Arg RAD51C(5889):p.Gly125Val RAD51C(5889):p.Gly153Asp RAD51C(5889):p.Gly264Ser RAD51C(5889):p.Gly264Val RAD51C(5889):p.Gly3Arg RAD51C(5889):p.Leu219Ser RAD51C(5889):p.Thr287Ala RAD51C(5889):p.Val169Ala RAD51C(5889):D109Y RAD51C(5889):G162E RAD51C(5889):L27P RAD51C(5889):S163R RAD51C(5889):T336P RAD51C(5889):p.Gly162Glu RAD51C(5889):p.Ser163Arg RAD51C(5889):p.Thr336Pro RAD51D(5892):p.Thr86Ile RAD51C(5889):A155E RAD51C(5889):C147Y RAD51(5888):D108G RAD51C(5889):D159Y RAD51C(5889):G306R RAD51C(5889):p.Ala155Glu RAD51(5888):p.Asp108Gly RAD51C(5889):p.Asp109Tyr RAD51C(5889):p.Asp159Tyr RAD51C(5889):p.Cys147Tyr RAD51C(5889):p.Gly306Arg RAD51C(5889):p.Pro21Ser RAD51C(5889):p.Glu94Lys RAD51C(5889):K131I

      Genes: RAD51C(5889) RAD51D(5892) RAD51(5888)

      Variants: 16 A C135Y E94K G130R G302V K131 L138F P21S Q133E R168 R168G R312 R312W T132I T132R T86I V140E p.Cys135Tyr p.Thr132Ile p.Val140Glu A126T D159N G125V G153D G264S G264V G3R L219S Q143R R214C R258H R366Q T287A V169A p.Arg214Cys p.Arg258His p.Arg312Trp p.Arg366Gln p.Asp159Asn p.Gln143Arg p.Gly125Val p.Gly153Asp p.Gly264Ser p.Gly264Val p.Gly3Arg p.Leu219Ser p.Thr287Ala p.Val169Ala D109Y G162E L27P S163R T336P p.Gly162Glu p.Ser163Arg p.Thr336Pro p.Thr86Ile A155E C147Y D108G D159Y G306R p.Ala155Glu p.Asp108Gly p.Asp109Tyr p.Asp159Tyr p.Cys147Tyr p.Gly306Arg p.Pro21Ser p.Glu94Lys K131I

    2. Structural details can provide mechanistic insight into variant effects on protein function. However, the structure of the RAD51C protein had not been experimentally determined at the time of this study. Initially, a hom

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 15

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses how several variants, including K131, R168G, G130R, and others, alter the molecular function of RAD51C by disrupting the ATP-binding site and influencing RAD51C activity, as demonstrated in HDR assays. Oncogenic: The passage indicates that the variants are deleterious and influence RAD51C function, which is relevant to tumor development or progression, particularly in the context of HDR assays.

      Gene→Variant (gene-first): 5889:16 A 5889:C135Y 5889:E94K 5889:G130R 5889:G302V 5889:K131 5889:L138F 5889:P21S 5889:Q133E 5889:R168 5889:R168G 5889:R312 5889:R312W 5889:T132I 5889:T132R 5892:T86I 5889:V140E 5889:p.Cys135Tyr 5889:p.Thr132Ile 5889:p.Val140Glu

      Genes: 5889 5892

      Variants: 16 A C135Y E94K G130R G302V K131 L138F P21S Q133E R168 R168G R312 R312W T132I T132R T86I V140E p.Cys135Tyr p.Thr132Ile p.Val140Glu

    3. RAD51C forms the BCDX2 and CX3 complexes that are involved in RAD51 recruitment to sites of DNA damage. To evaluate the influence of RAD51C variants on the integrity of these intrinsic complexes, coimmunoprecipitation of

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 13

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses how various RAD51C variants affect the ability to form protein complexes involved in DNA damage repair, indicating that these variants alter molecular function. Oncogenic: The mention of deleterious variants that lose the ability to form complexes suggests a role in tumor development or progression, as these variants are associated with impaired DNA repair mechanisms.

      Gene→Variant (gene-first): 5889:A126T 5889:D109Y 5889:D159N 5889:G162E 5889:G302V 5889:L138F 5889:L27P 5889:Q133E 5889:R258H 5889:S163R 5889:T336P 5892:T86I 5889:p.Gly162Glu 5889:p.Ser163Arg 5889:p.Thr336Pro 5892:p.Thr86Ile

      Genes: 5889 5892

      Variants: A126T D109Y D159N G162E G302V L138F L27P Q133E R258H S163R T336P T86I p.Gly162Glu p.Ser163Arg p.Thr336Pro p.Thr86Ile

    4. Because RAD51C participates in DNA damage signaling by regulating cell cycle progression, colony formation assays were performed to evaluate the influence of RAD51C variants on cell proliferation. U2OS RAD51C-/- landing

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 11

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses how RAD51C variants alter cell proliferation and the formation of RAD51 foci in response to ionizing radiation, indicating changes in molecular function related to DNA damage signaling and repair. Oncogenic: The variants are implicated in a proliferation defect and disruption of homologous recombination (HR) repair, suggesting their role in tumor development or progression.

      Gene→Variant (gene-first): 5889:G130R 5889:G302V 5889:K131I 5889:L138F 5889:Q133E 5889:R168G 5889:T132R

      Genes: 5889

      Variants: G130R G302V K131I L138F Q133E R168G T132R

    5. In parallel, a recent study evaluated the influence of 36 RAD51C missense variants on HR activity of U2OS and 21 on HR activity of MCF10A cells. Importantly, 18 of 36 evaluated in U2OS and 13 of 21 evaluated in MCF10A ce

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 10

      Evidence Type(s): Functional, Predictive

      Justification: Functional: The passage discusses how the L138F variant alters HDR activity in different cell lines, indicating a change in molecular function. Predictive: The passage mentions the sensitivity of variants, including L138F, to cisplatin and olaparib, suggesting a correlation with response to these therapies.

      Gene→Variant (gene-first): 5889:L138F

      Genes: 5889

      Variants: L138F

    6. To confirm the functional effects of RAD51C variants in a human cell line, RAD51C WT and 7 deleterious or intermediate missense variants in the HDR assay (G130R, K131I, T132R, Q133E, L138F, R168G and G302V) were introduc

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 9

      Evidence Type(s): Predictive, Functional

      Justification: Predictive: The passage discusses the sensitivity of specific RAD51C variants (G130R, K131I, T132R, Q133E, and G302V) to olaparib, indicating a correlation with response to therapy. Functional: The passage describes the introduction of RAD51C variants into a cell line and assesses their effects on homologous recombination repair (HDR), indicating that these variants alter molecular function.

      Gene→Variant (gene-first): 5889:G130R 5889:G302V 5889:K131I 5889:L138F 5889:Q133E 5889:R168G 5889:T132R

      Genes: 5889

      Variants: G130R G302V K131I L138F Q133E R168G T132R

    7. An inability to form RAD51 foci at the sites of DNA DSBs is a key component of an HR deficient phenotype. Because disruption of RAD51C substantially decreases RAD51 foci formation the influence of RAD51C missense variant

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 7

      Evidence Type(s): Functional, Predictive

      Justification: Functional: The passage discusses how RAD51C missense variants alter RAD51 foci formation in response to DNA damage, indicating a change in molecular function related to DNA repair mechanisms. Predictive: The mention of "drug response findings" suggests that the variants may correlate with sensitivity or resistance to a specific therapy, indicating predictive evidence.

      Gene→Variant (gene-first): 5889:A155E 5889:C135Y 5889:C147Y 5888:D108G 5889:D109Y 5889:D159Y 5889:G306R 5889:P21S 5889:V140E 5889:p.Ala155Glu 5888:p.Asp108Gly 5889:p.Asp109Tyr 5889:p.Asp159Tyr 5889:p.Cys147Tyr 5889:p.Gly306Arg 5889:p.Pro21Ser 5889:p.Val140Glu

      Genes: 5889 5888

      Variants: A155E C135Y C147Y D108G D109Y D159Y G306R P21S V140E p.Ala155Glu p.Asp108Gly p.Asp109Tyr p.Asp159Tyr p.Cys147Tyr p.Gly306Arg p.Pro21Ser p.Val140Glu

    8. RAD51C loss promotes HR deficiency and sensitizes cells to cisplatin and olaparib PARP inhibitor. Thus, the influence of 60 RAD51C missense variants from the HDR assay (30 deleterious, 23 neutral, and 7 intermediate) on

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 5

      Evidence Type(s): Predictive, Functional

      Justification: Predictive: The passage discusses the influence of RAD51C missense variants on the response to cisplatin and olaparib, indicating a correlation between the variants and treatment sensitivity. Functional: The passage describes how the variants affect IC50 values in the HDR assay, suggesting that they alter molecular function related to drug response.

      Gene→Variant (gene-first): 5889:E94K 5889:G306R 5889:p.Glu94Lys 5889:p.Gly306Arg

      Genes: 5889

      Variants: E94K G306R p.Glu94Lys p.Gly306Arg

    9. A cell-based DR-GFP HDR colorimetric reporter assay was used to assess the influence of 173 missense mutations on RAD51C HR DNA repair activity (Supplementary Table S1). RAD51C deficient CL-V4B cells were reconstituted w

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 3

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses the influence of missense mutations on RAD51C HR DNA repair activity, indicating that the variants alter molecular function as assessed by HDR activity in a cell-based assay. Oncogenic: The mention of deleterious variants categorized based on their impact on HDR activity suggests that these somatic variants contribute to tumor development or progression through their effects on DNA repair mechanisms.

      Gene→Variant (gene-first): 5889:A126T 5889:C135Y 5889:D159N 5889:G125V 5889:G153D 5889:G264S 5889:G264V 5889:G3R 5889:L138F 5889:L219S 5889:Q143R 5889:R214C 5889:R258H 5889:R312W 5889:R366Q 5889:T287A 5889:V169A 5889:p.Arg214Cys 5889:p.Arg258His 5889:p.Arg312Trp 5889:p.Arg366Gln 5889:p.Asp159Asn 5889:p.Gln143Arg 5889:p.Gly125Val 5889:p.Gly153Asp 5889:p.Gly264Ser 5889:p.Gly264Val 5889:p.Gly3Arg 5889:p.Leu219Ser 5889:p.Thr287Ala 5889:p.Val169Ala

      Genes: 5889

      Variants: A126T C135Y D159N G125V G153D G264S G264V G3R L138F L219S Q143R R214C R258H R312W R366Q T287A V169A p.Arg214Cys p.Arg258His p.Arg312Trp p.Arg366Gln p.Asp159Asn p.Gln143Arg p.Gly125Val p.Gly153Asp p.Gly264Ser p.Gly264Val p.Gly3Arg p.Leu219Ser p.Thr287Ala p.Val169Ala

    10. Structural details can provide mechanistic insight into variant effects on protein function. However, the structure of the RAD51C protein had not been experimentally determined at the time of this study. Initially, a hom

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 15

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses how several variants, including K131, R168G, G130R, and others, alter the molecular function of RAD51C by disrupting the ATP-binding site and influencing RAD51C activity, as demonstrated in HDR assays. Oncogenic: The passage indicates that the variants are deleterious and influence RAD51C function, which is relevant to tumor development or progression, particularly in the context of HDR assays.

      Gene→Variant (gene-first): 5889:16 A 5889:C135Y 5889:E94K 5889:G130R 5889:G302V 5889:K131 5889:L138F 5889:P21S 5889:Q133E 5889:R168 5889:R168G 5889:R312 5889:R312W 5889:T132I 5889:T132R 5892:T86I 5889:V140E 5889:p.Cys135Tyr 5889:p.Thr132Ile 5889:p.Val140Glu

      Genes: 5889 5892

      Variants: 16 A C135Y E94K G130R G302V K131 L138F P21S Q133E R168 R168G R312 R312W T132I T132R T86I V140E p.Cys135Tyr p.Thr132Ile p.Val140Glu

    11. RAD51C forms the BCDX2 and CX3 complexes that are involved in RAD51 recruitment to sites of DNA damage. To evaluate the influence of RAD51C variants on the integrity of these intrinsic complexes, coimmunoprecipitation of

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 13

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses how various RAD51C variants affect the ability to form protein complexes involved in DNA damage repair, indicating that these variants alter molecular function. Oncogenic: The mention of deleterious variants that lose the ability to form complexes suggests a role in tumor development or progression, as these variants are associated with impaired DNA repair mechanisms.

      Gene→Variant (gene-first): 5889:A126T 5889:D109Y 5889:D159N 5889:G162E 5889:G302V 5889:L138F 5889:L27P 5889:Q133E 5889:R258H 5889:S163R 5889:T336P 5892:T86I 5889:p.Gly162Glu 5889:p.Ser163Arg 5889:p.Thr336Pro 5892:p.Thr86Ile

      Genes: 5889 5892

      Variants: A126T D109Y D159N G162E G302V L138F L27P Q133E R258H S163R T336P T86I p.Gly162Glu p.Ser163Arg p.Thr336Pro p.Thr86Ile

    12. Because RAD51C participates in DNA damage signaling by regulating cell cycle progression, colony formation assays were performed to evaluate the influence of RAD51C variants on cell proliferation. U2OS RAD51C-/- landing

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 11

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses how RAD51C variants alter cell proliferation and the formation of RAD51 foci in response to ionizing radiation, indicating changes in molecular function related to DNA damage signaling and repair. Oncogenic: The variants are implicated in a proliferation defect and disruption of homologous recombination (HR) repair, suggesting their role in tumor development or progression.

      Gene→Variant (gene-first): 5889:G130R 5889:G302V 5889:K131I 5889:L138F 5889:Q133E 5889:R168G 5889:T132R

      Genes: 5889

      Variants: G130R G302V K131I L138F Q133E R168G T132R

    13. In parallel, a recent study evaluated the influence of 36 RAD51C missense variants on HR activity of U2OS and 21 on HR activity of MCF10A cells. Importantly, 18 of 36 evaluated in U2OS and 13 of 21 evaluated in MCF10A ce

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 10

      Evidence Type(s): Functional, Predictive

      Justification: Functional: The passage discusses how the L138F variant alters HDR activity in different cell lines, indicating a change in molecular function. Predictive: The passage mentions the sensitivity of variants, including L138F, to cisplatin and olaparib, suggesting a correlation with response to these therapies.

      Gene→Variant (gene-first): 5889:L138F

      Genes: 5889

      Variants: L138F

    14. To confirm the functional effects of RAD51C variants in a human cell line, RAD51C WT and 7 deleterious or intermediate missense variants in the HDR assay (G130R, K131I, T132R, Q133E, L138F, R168G and G302V) were introduc

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 9

      Evidence Type(s): Predictive, Functional

      Justification: Predictive: The passage discusses the sensitivity of specific RAD51C variants (G130R, K131I, T132R, Q133E, and G302V) to olaparib, indicating a correlation with response to therapy. Functional: The passage describes the introduction of RAD51C variants into a cell line and assesses their effects on homologous recombination repair (HDR), indicating that these variants alter molecular function.

      Gene→Variant (gene-first): 5889:G130R 5889:G302V 5889:K131I 5889:L138F 5889:Q133E 5889:R168G 5889:T132R

      Genes: 5889

      Variants: G130R G302V K131I L138F Q133E R168G T132R

    15. An inability to form RAD51 foci at the sites of DNA DSBs is a key component of an HR deficient phenotype. Because disruption of RAD51C substantially decreases RAD51 foci formation the influence of RAD51C missense variant

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 7

      Evidence Type(s): Functional, Predictive

      Justification: Functional: The passage discusses how RAD51C missense variants alter RAD51 foci formation in response to DNA damage, indicating a change in molecular function related to DNA repair mechanisms. Predictive: The mention of "drug response findings" suggests that the variants may correlate with sensitivity or resistance to a specific therapy, indicating predictive evidence.

      Gene→Variant (gene-first): 5889:A155E 5889:C135Y 5889:C147Y 5888:D108G 5889:D109Y 5889:D159Y 5889:G306R 5889:P21S 5889:V140E 5889:p.Ala155Glu 5888:p.Asp108Gly 5889:p.Asp109Tyr 5889:p.Asp159Tyr 5889:p.Cys147Tyr 5889:p.Gly306Arg 5889:p.Pro21Ser 5889:p.Val140Glu

      Genes: 5889 5888

      Variants: A155E C135Y C147Y D108G D109Y D159Y G306R P21S V140E p.Ala155Glu p.Asp108Gly p.Asp109Tyr p.Asp159Tyr p.Cys147Tyr p.Gly306Arg p.Pro21Ser p.Val140Glu

    16. RAD51C loss promotes HR deficiency and sensitizes cells to cisplatin and olaparib PARP inhibitor. Thus, the influence of 60 RAD51C missense variants from the HDR assay (30 deleterious, 23 neutral, and 7 intermediate) on

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 5

      Evidence Type(s): Predictive, Functional

      Justification: Predictive: The passage discusses the influence of RAD51C missense variants on the response to cisplatin and olaparib, indicating a correlation between the variants and treatment sensitivity. Functional: The passage describes how the variants affect IC50 values in the HDR assay, suggesting that they alter molecular function related to drug response.

      Gene→Variant (gene-first): 5889:E94K 5889:G306R 5889:p.Glu94Lys 5889:p.Gly306Arg

      Genes: 5889

      Variants: E94K G306R p.Glu94Lys p.Gly306Arg

    17. A cell-based DR-GFP HDR colorimetric reporter assay was used to assess the influence of 173 missense mutations on RAD51C HR DNA repair activity (Supplementary Table S1). RAD51C deficient CL-V4B cells were reconstituted w

      [Paragraph-level] PMCID: PMC10390864 Section: RESULTS PassageIndex: 3

      Evidence Type(s): Functional, Oncogenic

      Justification: Functional: The passage discusses the influence of missense mutations on RAD51C HR DNA repair activity, indicating that the variants alter molecular function as assessed by HDR activity in a cell-based assay. Oncogenic: The mention of deleterious variants categorized based on their impact on HDR activity suggests that these somatic variants contribute to tumor development or progression through their effects on DNA repair mechanisms.

      Gene→Variant (gene-first): 5889:A126T 5889:C135Y 5889:D159N 5889:G125V 5889:G153D 5889:G264S 5889:G264V 5889:G3R 5889:L138F 5889:L219S 5889:Q143R 5889:R214C 5889:R258H 5889:R312W 5889:R366Q 5889:T287A 5889:V169A 5889:p.Arg214Cys 5889:p.Arg258His 5889:p.Arg312Trp 5889:p.Arg366Gln 5889:p.Asp159Asn 5889:p.Gln143Arg 5889:p.Gly125Val 5889:p.Gly153Asp 5889:p.Gly264Ser 5889:p.Gly264Val 5889:p.Gly3Arg 5889:p.Leu219Ser 5889:p.Thr287Ala 5889:p.Val169Ala

      Genes: 5889

      Variants: A126T C135Y D159N G125V G153D G264S G264V G3R L138F L219S Q143R R214C R258H R312W R366Q T287A V169A p.Arg214Cys p.Arg258His p.Arg312Trp p.Arg366Gln p.Asp159Asn p.Gln143Arg p.Gly125Val p.Gly153Asp p.Gly264Ser p.Gly264Val p.Gly3Arg p.Leu219Ser p.Thr287Ala p.Val169Ala