Evolutionary origin of gastrulation: insights from sponge development

  title={Evolutionary origin of gastrulation: insights from sponge development},
  author={Nagayasu Nakanishi and Shunsuke Sogabe and Bernard M. Degnan},
  booktitle={BMC Biology},
The evolutionary origin of gastrulation—defined as a morphogenetic event that leads to the establishment of germ layers—remains a vexing question. Central to this debate is the evolutionary relationship between the cell layers of sponges (poriferans) and eumetazoan germ layers. Despite considerable attention, it remains unclear whether sponge cell layers undergo progressive fate determination akin to eumetazoan primary germ layer formation during gastrulation. Here we show by cell-labelling… CONTINUE READING
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