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Proof of a novel gene underlying B lymphocyte deficiency using genome-edited mice

Research Project

Project/Area Number 20K08153
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 InstitutionTohoku University

Principal Investigator

Kikuchi Atsuo  東北大学, 医学系研究科, 教授 (30447156)

Co-Investigator(Kenkyū-buntansha) 石井 直人  東北大学, 医学系研究科, 教授 (60291267)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords胎盤 / Bリンパ球 / ゲノム編集マウス / 希少疾患 / 造血
Outline of Research at the Start

Bリンパ球欠損症の患者から見出した新規候補遺伝子について、遺伝学的・機能的に証明することを試みる。遺伝学的証明として同一遺伝子によるBリンパ球欠損少患者のさらなる同定を試みる。機能的解析の中心としてはゲノム編集マウスによる解析を通じてこの遺伝子がBリンパ球や造血系に重要な働きをしていることを示す。これらの解析により、Bリンパ球欠損の新規原因遺伝子として証明するのが本研究の目的である。

Outline of Final Research Achievements

In this study, we did not identify any patient with B lymphocyte deficiency and a variant in gene X, and could not genetically prove this gene as the causative gene. Analysis of hematopoietic cells, including B lymphocytes, from genome-edited mice carrying the same mutation as the patient did not reveal significant differences compared to wild-type mice, and the patient's phenotype was not replicated.
On the other hand, homozygous mice were found to be almost embryonic lethal. Gross analysis of the fetus and placenta in homozygous mice showed growth retardation, pale bodies, subcutaneous edema, and subcutaneous hemorrhage. Histological analysis revealed that changes in the placenta were observed at the earliest stages, suggesting that placental damage might be the cause of embryonic lethality. Contrary to our initial expectations, it was suggested that one of the functions of this gene, previously unknown, is to be a molecule necessary for the normal development of the placenta.

Academic Significance and Societal Importance of the Research Achievements

本研究ではヒトBリンパ球欠損症の症状を再現する目的で作成した、候補遺伝子変異を有するマウスの解析を通じて、予想外にもこの機能不明であった本遺伝子の産物の機能の一つとして胎盤の正常発生に必要な役割を果たしている可能性を挙げることができた。本研究で作成したモデルマウスを用いた今後の研究によって、本分子の生理的機能および欠損時の病態メカニズムのさらなる解明につながることが期待される。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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