The Nanog epigenetic remodeling complex was essential to vertebrate mesoderm evolution
Simpson, L.; Crowley, D.; Forey, T.; Acosta, H.; Ferjentsik, Z.; Chatfield, J.; Payne, A.; Simpson, B.; Redwood, C.; Dixon, J.; Holmes, N.; Sang, F.; Alberio, R.; Loose, M.; Johnson, A. D.
Show abstract
Pluripotency defines the unlimited potential of cells in the primitive ectoderm of vertebrate embryos, from which all adult somatic cells and germ cells are derived. Understanding how the programing of pluripotency evolved has been obscured by the study of early development in models from lower vertebrates in which pluripotency is not conserved. Here we investigated how the axolotl ortholog of the mammalian core pluripotency factor NANOG, programs pluripotency during axolotl development to model the tetrapod ancestor from which terrestrial vertebrates evolved. We show that in axolotl primitive ectoderm (animal caps; AC) NANOG synergizes with NODAL activity and the epigenetic modifying enzyme DPY30 to direct the deposition of H3K4me3 in chromatin prior to the waves of transcription required for lineage commitment and developmental progression. We show that the interaction of NANOG and NODAL with DPY30 is required to direct development downstream of pluripotency and this is conserved in axolotls and human. These data demonstrate that the interaction of NANOG and NODAL signaling represents the basal state of vertebrate pluripotency.
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