短尾鱼
生物
中胚层
原肠化
增强子
内胚层
转录因子
节的
遗传学
胚胎干细胞
FGF与中胚层形成
细胞生物学
基因
作者
Katrin M. Schüle,Jelena Weckerle,Simone Probst,Alexandra E. Wehmeyer,Lea Zissel,Chiara M. Schröder,Mehmet Tekman,Gwang-Jin Kim,Inga-Marie Schlägl,Sagar Sagar,Sebastian J. Arnold
标识
DOI:10.1016/j.devcel.2023.07.023
摘要
Mammalian specification of mesoderm and definitive endoderm (DE) is instructed by the two related Tbx transcription factors (TFs) Eomesodermin (Eomes) and Brachyury sharing partially redundant functions. Gross differences in mutant embryonic phenotypes suggest specific functions of each TF. To date, the molecular details of separated lineage-specific gene regulation by Eomes and Brachyury remain poorly understood. Here, we combine mouse embryonic and stem-cell-based analyses to delineate the non-overlapping, lineage-specific transcriptional activities. On a genome-wide scale, binding of both TFs overlaps at promoters of target genes but shows specificity for distal enhancer regions that is conferred by differences in Tbx DNA-binding motifs. The unique binding to enhancer sites instructs the specification of anterior mesoderm (AM) and DE by Eomes and caudal mesoderm by Brachyury. Remarkably, EOMES antagonizes BRACHYURY gene regulatory functions in coexpressing cells during early gastrulation to ensure the proper sequence of early AM and DE lineage specification followed by posterior mesoderm derivatives.
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