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Elucidation of the function of miRNAs at the 14q32.2 imprinted region in the placental development and hepatoblastoma development

Research Project

Project/Area Number 18K06356
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45010:Genetics-related
Research InstitutionNational Center for Child Health and Development

Principal Investigator

Kagami Masayo  国立研究開発法人国立成育医療研究センター, 分子内分泌研究部, 室長 (70399484)

Co-Investigator(Kenkyū-buntansha) 高田 修治  国立研究開発法人国立成育医療研究センター, システム発生・再生医学研究部, 部長 (20382856)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsインプリンティング / miRNA / 14番染色体 / 肝芽腫 / 胎盤 / 14q32 / マイクロRNA
Outline of Final Research Achievements

We conducted expression, methylation, and chromosome structure analyses in 14 hepatoblastoma tissues together with normal liver samples. Nine hepatoblastoma tissues showed increased expression of the imprinted genes at 14q32.2. Methylation analysis of the promoter region of the overexpressed MEG3 gene showed normal methylation or hypermethylation without structural abnormalities of the imprinted region on chromosome 14. We generated a mouse model which delete miRNAs cluster at the human 14q32.2 imprinting region. The mouse phenotype was normal. The placenta of miRNAs KO mice had poor glycogen cells development and poor development of spongiotrophoblast layer. In trophoblasts, we observed cytoplasmic degeneration, and abnormalities in fetal vascular endothelium.

Academic Significance and Societal Importance of the Research Achievements

肝芽腫において14番染色体インプリンティング遺伝子のDLK1, MEG3の発現上昇を明らかにした。発現調節領域のMEG3プロモーターの低メチル化を示さないことから、これらの遺伝子の肝芽腫における発現増加は通常のインプリンティング調節機構によらないと予想された。加えて、KOマウスを用いた解析から、本領域内の多数の母性発現miRNAsは、胎盤におけるグリコーゲン細胞の形成、絨毛細胞特に胎児絨毛血管内皮の機能維持に関連していることを明らかとした。しかし、miRNAs KOマウスは出生し、その後の成長も野生型と違いがないことから、胎盤の異常についてはなんらかの代償機構が存在することが予想された。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (1 results)

All 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results)

  • [Journal Article] Temple Syndrome in a Patient With Variably Methylated CpGs at the Primary MEG3/DLK1:IG-DMR and Severely Hypomethylated CpGs at the Secondary MEG3:TSS-DMR2019

    • Author(s)
      Kagami M, Yanagisawa A, Ota M, Matsuoka K, Nakamura A, Matsubara K, Nakabayashi K, Takada S, Fukami M, Ogata T.
    • Journal Title

      Clinical Epigenetics

      Volume: 11 Issue: 1 Pages: 41-41

    • DOI

      10.1186/s13148-019-0640-2

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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