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    宋晓元

    • 教授 博士生导师 硕士生导师
    • 教师英文名称:Xiaoyuan Song
    • 教师拼音名称:songxiaoyuan
    • 电子邮箱:
    • 学历:博士研究生毕业
    • 办公地点:中国科学技术大学西校区科技东楼915
    • 学位:博士
    • 毕业院校:美国罗彻斯特大学
    • 学科:生物学
    • 2022-10-01曾获荣誉当选:“典赞 2022科普安徽”科普活动“年度科普作品”
    • 2021-05-01曾获荣誉当选:安徽省优秀科普作品一等奖
    • 2019-09-16曾获荣誉当选:王宽诚育才奖

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    Unphosphorylated H1 is enriched in a specific region of the promoter when CDC2 is down-regulated during starvation.

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    DOI码:10.1128/MCB.01619-06

    发表刊物:Mol Cell Biol

    摘要:Tetrahymena thermophila macronuclear histone H1 is phosphorylated by a cdc2 kinase, and H1 phosphorylation regulates CDC2 expression by a positive feedback mechanism. In starved wild-type cells, decreased expression of the CDC2 gene is correlated with a global reduction in the phosphorylation of H1 and reduced phosphorylation of H1 in the region upstream of the CDC2 gene. To determine whether the reduced H1 phosphorylation upstream of the CDC2 gene is merely a reflection of global dephosphorylation or is due to specific targeting of dephosphorylation of H1 to the CDC2 promoter during starvation, the CDC2 promoter was mapped, and the distributions of phosphorylated and unphosphorylated H1 across the CDC2 gene were determined using chromatin immunoprecipitation. Unphosphorylated H1 is specifically enriched in a region of the CDC2 promoter when the gene's expression is reduced during starvation but not when CDC2 is highly active in growing cells. The region of unphosphorylated H1 coincides with a region that is essential for CDC2 expression. These studies are the first in vivo demonstration that the phosphorylation of H1 is being regulated at a fine level and that unphosphorylated H1 can be specifically targeted to a promoter, where it likely regulates transcription in a gene-specific manner.

    卷号:27

    期号:5

    页面范围:1925-33

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