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Elucidation of the mechanism of hyperactivation of p53 lacking C terminal domain

Research Project

Project/Area Number 20K08202
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionUniversity of Yamanashi

Principal Investigator

Nakane Takaya  山梨大学, 大学院総合研究部, 医学研究員 (90422683)

Co-Investigator(Kenkyū-buntansha) 矢ヶ崎 英晃  山梨大学, 大学院総合研究部, 特任講師 (00377540)
成澤 宏宗  山梨大学, 大学院総合研究部, 臨床助教 (70808013)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsp53 / TP53
Outline of Research at the Start

ヒトで見出されたp53機能亢進型変異が骨髄機能不全の原因であることを確認するために、ヒトと同等のp53変異を持つ遺伝子編集マウスを作成したところ、ヘテロ体で末梢リンパ球著減と軽度大球性貧血を示し、全身放射線照射で高度な貧血が生じた。今回の研究では変異遺伝子を導入したK562培養細胞・患者由来iPS細胞(いずれも樹立済み)・遺伝子編集マウスを用いて、①p53機能亢進型変異の造血機能障害の機序の解明、および②p53機能亢進由来高度骨髄機能不全の薬物治療法の開発、③既知の遺伝子異常が否定された高度骨髄機能不全患者のp53遺伝子解析を行い、ヒトでのp53機能亢進型変異の重要性を明らかにする。

Outline of Final Research Achievements

Mutants lacking the carboxyl terminal (CTD) of p53 lack the MDM2/4 binding site and results in p53 hyperactivation; mouse homozygotes carrying p53 lacking CTD have severe bone marrow failure and die early. To examine the relationship between the extent of CTD deletion in p53 and phenotype, we generated two types of gene-edited mice with incomplete and complete deletion of the CTD. In addition, using K562 cells transfected with wild-type p53 and p53 lacking CTD, the effect of CTD in p53 on hemin-induced erythroid differentiation was examined by measuring hemoglobin positive cells. We found that, first, partial CTD deletion caused much severer phenotype than complete CTD deletion did, and the male sterility was found in mice with incomplete CTD deletion for the first time, second, p53 lacking CTD mutations in two alleles are additive in severity of the pehnotype, third, CTD of p53 acts in a promotive manner with respect to erythroid-like cell differentiation effects.

Academic Significance and Societal Importance of the Research Achievements

CTDのp53機能制御メカニズムへの関与を明らかにしたことは、p53の機能低下・亢進で生じるがんや骨髄形成不全などの治療法の開発に役立つ。P53のCTD欠失ヘテロマウスでの雄性不妊発見は、ヒトでもp53のCTD欠失が男性不妊の原因である可能性を示し、新たな病態の解明や治療法の開発に資する。P53のK562細胞に対する赤血球様分化にCTDが促進的に作用していることの解明は、K562が慢性白血病細胞から樹立された細胞株であることを鑑みれば、p53のCTD分子や、CTDに対する抗体などを用いた腫瘍細胞の治療法開発に役立つ。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

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