Throughout embryonic development, segregated epithelial and/or mesenchymal cell populations make contact and fuse to shape new tissue units. This process, known as tissue fusion, is a key event in many essential morphogenetic mechanisms and its disruption can lead to congenital malformations. Another mechanism whereby complex tissues can arise involves a cell sorting process in which originally intermixed cells de-mix to generate distinct phases or layers. Different organisms use a combination of tissue fusion and cell sorting to acquire shape. Although the two processes appear to differ mechanistically, they are intricately linked inasmuch as they both involve the same molecular determinants and contribute to the same body plan. We aim to discuss the role of adhesion molecules and cell dynamics in tissue fusion and cell sorting, providing examples of their impact in embryonic development. Finally, we will advance the concept that malignant invasion may be viewed as cell sorting in reverse. Supplementary material for this article can be found on the BioEssays website (http://www.interscience.wiley.com/jpages/0265-9247/suppmat/index.html).
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