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CXXC finger protein 1 is critical for T-cell intrathymic development through regulating H3K4 trimethylation #MMPMID27210293
Cao W; Guo J; Wen X; Miao L; Lin F; Xu G; Ma R; Yin S; Hui Z; Chen T; Guo S; Chen W; Huang Y; Liu Y; Wang J; Wei L; Wang L
Nat Commun 2016[]; 7 (ä): ä PMID27210293show ga
T-cell development in the thymus is largely controlled by an epigenetic program, involving in both DNA methylation and histone modifications. Previous studies have identified Cxxc1 as a regulator of both cytosine methylation and histone 3 lysine 4 trimethylation (H3K4me3). However, it is unknown whether Cxxc1 plays a role in thymocyte development. Here we show that T-cell development in the thymus is severely impaired in Cxxc1-deficient mice. Furthermore, we identify genome-wide Cxxc1-binding sites and H3K4me3 modification sites in wild-type and Cxxc1-deficient thymocytes. Our results demonstrate that Cxxc1 directly controls the expression of key genes important for thymocyte survival such as ROR?t and for T-cell receptor signalling including Zap70 and CD8, through maintaining the appropriate H3K4me3 on their promoters. Importantly, we show that ROR?t, a direct target of Cxxc1, can rescue the survival defects in Cxxc1-deficient thymocytes. Our data strongly support a critical role of Cxxc1 in thymocyte development.