The MLL/Setd1b methyltransferase is required for the Spemann's organizer gene activation in Xenopus. (November 2016)

• Record Type: Journal Article
• Authors: Lin, Hao; Min, Zheying; Tao, Qinghua
• Is Part Of: Mechanisms of development. Volume 142(2016)
• Page Start: 1
• Page End: 9
• Publication Date: 2016-11
• Subjects: Wdr5 -- Setd1b -- Wnt/β-catenin signaling -- Organizer formation -- H3K4 trimethylation -- Xenopus; Developmental biology -- Periodicals; Molecular biology -- Periodicals; Developmental Biology -- Periodicals; Molecular Biology -- Periodicals; Biologie du développement -- Périodiques; Biologie moléculaire -- Périodiques; Developmental biology; Molecular biology; Periodicals; Electronic journals; 571.8
• DOI: 10.1016/j.mod.2016.08.002
• Languages: English
• ISSNs: 0925-4773

Abstract

Abstract: Wdr5 is an essential component of SET/MLL methylase complexes that catalyze histone H3 lysine 4 trimethylation. The maternal Wnt/β-catenin signaling is necessary for the H3K4me3 deposition at organizer genes in early Xenopus embryos. However, it remains unknown whether any component of SET/MLL methylase complex is required for Wnt signaling to establish H3K4me3 at its targets during the organizer induction. Here, we provide evidence that Wdr5 is required for dorsal axis development and organizer gene activation in Xenopus . Depletion of maternal Wdr5 resulted in ventralized development, phenocopying depletion of maternal β-catenin. Depletion of maternal Wdr5 also drastically reduced the ability of β-catenin to activate organizer genes. Siamois, a direct target of maternal Wnt/β-catenin signaling, was able to reinitiate dorsal axis formation when Wdr5 was depleted. Importantly, we demonstrate that Wdr5 is required for H3K4me3 establishment at the promoter region of siamois . Moreover, we found evidence that Setd1b, a maternally provided methyltransferase, is required for organizer gene expression. Our findings indicate that Wdr5-mediated H3K4 trimethylation plays a part in the organizer formation and dorsal axis development that are controlled by the maternal Wnt/β-catenin pathway. Highlights: Maternal Wdr5 is required for the dorsal development in Xenopus Wdr5 is required for b-catenin to fully activate organizer genes. Wdr5 depletion causes loss of H3K4me3 from the organizer gene loci. Ectopic Siamois is able to reinitiate axis formation in Wdr5-depleted embryos.