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Identification of radiation-associated genome damages for evaluation of cancer risk assessment

Research Project

Project/Area Number 12670337
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Hygiene
Research InstitutionNational Institute of Radiological Sciences

Principal Investigator

SHIMADA Yoshiya  National Institute of Radiological Sciences, Low Dose Radiation Effect Project, Sub-Leader, 低線量プロジェクト, サブリーダー (10201550)

Co-Investigator(Kenkyū-buntansha) KAKINUMA Shizuko  National Institute of Radiological Sciences, Low Dose Radiation Effect Project, Research Fellow, 低線量プロジェクト, リサーチフェロー
NISHIMURA Mayumi  National Institute of Radiological Sciences, Low Dose Radiation Effect Project, Senior Researcher, 低線量プロジェクト, 主任研究員 (70218204)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsT-cell leukemia / LOH / Ikaros / mouse / radiation / ENU
Research Abstract

To find the molecular pathways in radiation specific carcinogenesis, we determined the frequency and distribution of loss of heterozygosity (LOH), mutations of both Ikaros and K-ras genes, and methylation of p15 promoter of X-ray-induced thymic lymphomas (TL) of B6C3F1 mice and compared the results with those for spontaneous TL and N-ethylnitrosourea (ENU)-induced TL. We found a unique locus with frequent LOH in the centromeric region of chromosome 11 of X-ray-induced TL. This LOH has never been observed in either ENU-induced or spontaneous TLs, suggesting radiation-specific alteration. Linkage analysis revealed that the locus was genetically linked to Ikaros (Znflal), a master gene of lymphopoiesis. Ikaros was altered in 50% of TLs by a variety of mechanisms : (1) null expression (14%) ; (2) expression of dominant-negative isoforms(11%) ; (3) missense mutation in zinc-finger domain for DNA binding (22%) ; (4) lack of Ikaros isoform-1 due to an insertion of a dinucletotide. In contrast, only missense mutation was found in ENU-induced TL. Interestingly, Ikaros point mutation accompanied LOH in most of radiation-induced TL, losing expression of wild-type Ikaros protein, whereas small proportion of ENU-induced TL with Ikaros mutation lost expression of wild-type Ikaros. Next, methylation of p15 gene promoter was examined. While normal thymocytes did not show any methylation, the cells from TL showed distinct inter- and intra-tumor heterogeneity of methylation pattern. Methylation occurred more frequently in X-ray-induced TL than ENU-induced TL. There were several CpG sites where methylation was detected in only X-ray-induced TL, suggesting an existence of radiation-related CpG methylation. The frequency and spectrum of K-ras gene mutation, however, differed little between TLs. These results demonstrate that both Ikaros mutation with allelic loss of wild-type Ikaros and methylation of CpG of p15 gene promoter appear to be linked to radiation exposure.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (25 results)

All Other

All Publications (25 results)

  • [Publications] Shimada, Y., et al.: "Radiation-associated loss of heterozygosity at the Ikaros locus on chromosome 11 in murine thymic lymphomas"Radiation Research. 154. 293-300 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ogiu, T.: "Absence of linkage between radiosesitivity and the predisposing Atp7b gene mutation for heritable hepatitis in the LEC rat"Radiation Research. 154. 113-116 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shimada, Y., et al.: "Characterisitic association of K-ras gene mutation with loss of heterozygosity in X-ray-induced thymic lymphomas of B6C3F1 mice"Int.J.Radiat.Biol.. 77. 465-473 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Watanabe, N., et al.: "Single nucleotide instability without microsatellite instability in rat mammary carsinomas"Cancer Research. 61. 2632-2640 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nishimura, M., et al.: "Reduced sensitivity to and ras mutation spectrum of N-ethyl-N-nitorsourea-induced thymic lymphomas in adult C.B-17 scid mice"Mutation Research. 486. 275-283 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yamauchi, M., et al.: "Effect of SCID mutation on the occurrence of mouse Pc-1 (Ms6-hm) germline mutations"Mutation Research. 503. 43-49 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kakinuma, S., et al.: "Spectrum of Ikaros inactivation and its association with loss of heterozygosity in radiogenic T-cell lymphomas in susceptible B6C3F1 mice"Radiation Research. 157. 331-340 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shimada, Y., et al.: "Genetic susceptibility to thymic lymphomas and K-ras gene mutation in mice after exposure to X-rays and N-ethyl-N-nitrosourea"Int.J.Radiat.Biol.. (in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 島田 義也(共著): "血管新生研究の新展開"医薬ジャーナル社. 391 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 島田 義也(共著): "放射線の線源と影響 (UNSCEAR 2000 Report)"実業公報社. 643 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shimada, Y., et al.: "Radiation-associated loss of heterozygosity at the Ikaros locus on chromosome 11 in murine thymic lymphomas"Radiat. Res.. 154. 293-300 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ogiu, T.: "Absence of linkage between radiosensitivity and the predisposing Atp7b gene mutation for heritable hepatitis in the LEG rat"Radiat. Res.. 154. 113-116 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shimada, Y., et al.: "Characteristic association of K-ras gene mutation with loss of heterozygosity in X-ray-induced thymic lymphomas of B6C3F1 mice"Int. J. Radiat. Biol.. 77. 465-473 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Watanabe, N., et al.: "Single nucleotide instability without microsatellite instability in rat mammary carcinomas"Cancer Res.. 61. 2632-2640 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nishimura, M., et al.: "Reduced sensitivity to and ras mutation spectrum of N-ethyl-N-nitorsourea-induced thymic lymphomas in adult C.B-17 scid mice"Mutat. Res.. 486. 275-283 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kakinuma, S., et al: "Spectrum of Ikaros inactivation and its association with loss of heterozygosity in radiogenic T-cell lymphomas in susceptible B6C3F1 mice"Radiat. Res.. 157. 331-340 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yamauchi, M., et al.: "Effect of SCID mutation on the occurrence of mouse Pc-1 (Ms6-hm) germline mutalions"Mutat. Res.. 503. 43-49 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shimada, Y., et al.: "Genetic susceptibility to thymic lymphomas and K-ras gene mutalion in mice after exposure to X-rays and N-ethyl-N-nitrosourea"Int.J.Radiat.Biol.. In press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Shimada, Y., et al.: "Genetic susceptibility to thymic lymphomas and K-ras gene mutation in mice after exposure to X-rays and N-ethyl-N-nitrosourea."Int.J.Radiat.Biol.. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yamauch, M., et al.: "Effect of SCID mutation on the occurrence of mouse Pc-1 (Ms6-hm) germline mutations."Mutat.Res.. 503. 43-49 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kakinuma, S., et al.: "Spectrum of Ikaros inactivation and its association with loss of heterozygosity in radiogenic T-cell lymphomas in susceptible B6C3F1"Radiat.Res.. 157. 331-340 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Shimada, Y., et al.: "Characteristic association of K-ras gene mutation with loss of heterozygosity in X-ray-induced thymic lymphomas of B6C3F1 mice"Int. J. Radiat. Biol.. 77. 465-473 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Watanabe, N.: "Single nucleotide instability without microsatellite instability in rat mammary carcinomas"Cancer Res.. 61. 2632-2640 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nishimura, M.: "Reduced sensitivity to and ras mutation spectrum of N-ethyl-N-nitorsourea-induced thymic lvmphomas in adult C.B-17 scid mice"Mut. Res.. 486. 275-283 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Shimada,Y., et al.: "Radiation-associated loss of heterozygosity at the Ikaros locus on chromosome 11 in murine thymic lymphomas."Radiation Research. 154. 293-300 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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