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2022 Fiscal Year Final Research Report

Pathophysiological analysis of radioulnar synostosis with or without amegakaryocytic thrombocytopenia

Research Project

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Project/Area Number 20H03637
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionTohoku University

Principal Investigator

Niihori Tetsuya  東北大学, 医学系研究科, 准教授 (40436134)

Co-Investigator(Kenkyū-buntansha) 阿部 太紀  東北大学, 医学系研究科, 助教 (40810594)
青木 洋子  東北大学, 医学系研究科, 教授 (80332500)
Project Period (FY) 2020-04-01 – 2023-03-31
KeywordsEVI1 / MECOM / 橈尺骨癒合症 / 骨髄不全
Outline of Final Research Achievements

(1) Genetic analysis identified MECOM variants in two families of patients with bone marrow failure. In one family, the proband had a splicing variant but her mother did not had the variant in her leukocytes. SNP arrays using DNA from the mother's leukocyte revealed a copy number neutral loss of heterozygosity (CNLOH) in the region containing MECOM, and the mutant allele was lost.
(2) We generated a Mecom knock-in mice. The Mecom mutation is homologous to a missense mutation in ZF8 of MECOM,which was identified in a RUSAT patient. No skeletal abnormalities were observed, but a decreased number of hematopoietic stem cells was observed.

Free Research Field

臨床遺伝学

Academic Significance and Societal Importance of the Research Achievements

(1)MECOM関連疾患の患者において初めてspontaneous reversionが起こりうることを示した。これはMECOM関連疾患患者における血球減少について、経過観察および治療を考えていく上で重要な知見である。また、同一家系内においても表現度が異なることが示され、遺伝カウンセリングを行う上でも参考にすべき結果である。
(2)モデルマウスでの解析によって、特定の領域におけるミスセンス変異によっても既報のノックアウトマウスと類似の造血への影響を認めており、ミスセンス変異を導入した部位が造血に重要な役割を果たしていることを示した。治療法開発を考える上で重要な知見を得た。

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Published: 2024-01-30  

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