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2018 Fiscal Year Final Research Report

Role of the polycomb-group protein Pcgf1 in hematopoietic

Research Project

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Project/Area Number 17K16180
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Hematology
Research InstitutionChiba University

Principal Investigator

Nakajima-Takagi Yaeko  千葉大学, 大学院医学研究院, 特任助教 (50749497)

Research Collaborator IWAMA atsushi  
OSHIMA motohiko  
SHINODA daisuke  
Project Period (FY) 2017-04-01 – 2019-03-31
Keywordsポリコーム / Pcgf1 / 骨髄球分化 / JAK2
Outline of Final Research Achievements

Polycomb repressive complex (PRC) 1 negatively regulates transcription of target genes by mono-ubiquitylation of histone H2A at lysin 119. Pcgf1 is one of the non-canonical PRC1 components. We showed that Pcgf1 negatively regulated myeloid differentiation and proliferation by repressing the gene expression of Cebpa which is known as a critical regulator of myeloid development. It was reported that Pcgf4/Bmi1-containing canonical PRC1 was implicated in the suppression of B cell differentiation and our results suggest the distinct function of Pcgf1-containing non-canonical PRC1.1 and Bmi1-containing canonical PRC1 in hematopoietic differentiation.
We also examined the role of Pcgf1 in a mouse model of JAK2V617F-induced myelofibrosis.JAK2/Pcgf1 KO mice developed lethal myelofibrosis significantly earlier than the other genotypes, suggesting that insufficiency of non-canonical PRC1 complex accelerates the progression of myelofibrosis.

Free Research Field

造血細胞分化

Academic Significance and Societal Importance of the Research Achievements

造血細胞の制御におけるポリコーム群遺伝子の解析はこれまでCanonical PRC1を中心に行われ、重要な役割を果たすことが明らかにされてきた。一方で、近年、白血病など造血器腫瘍の遺伝子解析の結果から、その発症にnon-canonical PRC1の機能不全の寄与が示唆される造血器腫瘍があることがわかってきた。そのようななか、本研究はこれまで明らかにされていなかったnon-canonical PRC1の構成因子Pcgf1の造血細胞分化における役割を明らかにし、また、骨髄線維症をモデルとして病態の進展に関わることを示した。これは造血腫瘍の発症機序解明や治療モデルの確立に繋がる成果といえる。

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Published: 2020-03-30  

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