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Changes in maternal blood mitochondrial DNA copy number due to exposure to environmental chemicals and their effects on children

Research Project

Project/Area Number 21K17891
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 63030:Chemical substance influence on environment-related
Research InstitutionHokkaido University

Principal Investigator

FUKUNAGA Hisanori  北海道大学, 保健科学研究院, 准教授 (50781267)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsミトコンドリア / ミトコンドリアDNA / DNAコピー数 / DOHaD / 出生コホート / 次世代影響 / 環境化学物質 / 母系遺伝 / 胎児期病態発症起源説
Outline of Research at the Start

細胞内小器官ミトコンドリアは独自のゲノム(mtDNA)を有しており、ヒトの場合、16569塩基対の環状多コピーゲノムとして1細胞当たり数十から数千のコピーが存在し、母系遺伝する。母体の妊娠前あるいは胎児期の環境化学物質の曝露状況が、その後の先天異常、体格、神経発達などに影響するメカニズムを明らかにするため、本研究ではこのmtDNAコピー数に着目し、環境化学物質の曝露に伴う妊婦の血球細胞mtDNA量的変化と次世代への影響について検討を行う。

Outline of Final Research Achievements

Mitochondria have their own cyclic multi-copy genome (mtDNA), but the physiological and pathological significance of this mtDNA copy number (mtDNAcn) throughout life, especially during the perinatal period, remains to be determined. In this study, we measured and analyzed mtDNAcn in peripheral or cord blood samples from a total of 1,041 individuals from 149 three-generation families (grandparents, parents, and newborns) to analyze how changes in maternal peripheral blood mtDNAcn due to environmental factors during pregnancy, including chemical exposure, affect postnatal development. No correlation was found among environmental factors, such as maternal smoking and second-hand smoking exposure, maternal and newborn mtDNAcn, and birth outcomes.

Academic Significance and Societal Importance of the Research Achievements

我々の知る限り、本研究は、mtDNAコピー数の遺伝的相関の解明のために、三世代家族1000人以上の臍帯血・末梢血mtDNAコピー数を測定した初めての分子疫学研究である。妊娠中の化学物質曝露影響は明らかにできなかったものの、周産期における母児のmtDNAコピー数が新生児アウトカムと相関しており、妊娠時の母親の生活習慣への介入、とくに葉酸摂取によってmtDNAコピー数と新生児アウトカムを修正できる可能性を明らかにすることができた。これらは周産期医療における精密医療への新しいアプローチを示唆する成果といえる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2023 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results)

  • [Journal Article] Mitochondrial DNA copy number variation across three generations: a possible biomarker for assessing perinatal outcomes2023

    • Author(s)
      Fukunaga Hisanori、Ikeda Atsuko
    • Journal Title

      Human Genomics

      Volume: 17 Issue: 1 Pages: 113-113

    • DOI

      10.1186/s40246-023-00567-4

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mitochondrial DNA Copy Number and Developmental Origins of Health and Disease (DOHaD)2021

    • Author(s)
      Fukunaga Hisanori
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 12 Pages: 6634-6634

    • DOI

      10.3390/ijms22126634

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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