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Rac1 drives melanoblast organization during mouse development by orchestrating pseudopod- driven motility and cell-cycle progression

Research output: Contribution to journalJournal article

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  • Ang Li
  • Yafeng Ma
  • Xinzi Yu
  • Richard L. Mort
  • Colin R. Lindsay
  • David Stevenson
  • Douglas Strathdee
  • Robert H. Insall
  • Jonathan Chernoff
  • Scott B. Snapper
  • Ian J. Jackson
  • Lionel Larue
  • Owen J. Sansom
  • Laura M. Machesky
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<mark>Journal publication date</mark>18/10/2011
<mark>Journal</mark>Developmental Cell
Issue number4
Volume21
Number of pages13
Pages (from-to)722-734
Publication statusPublished
Early online date15/09/11
Original languageEnglish

Abstract

During embryogenesis, melanoblasts proliferate and migrate ventrally through the developing dermis and epidermis as single cells. Targeted deletion of Rac1 in melanoblasts during embryogenesis causes defects in migration, cell-cycle progression, and cytokinesis. Rac1 null cells migrate markedly less efficiently, but surprisingly, global steering, crossing the dermal/epidermal junction, and homing to hair follicles occur normally. Melanoblasts navigate in the epidermis using two classes of protrusion: short stubs and long pseudopods. Short stubs are distinct from blebs and are driven by actin assembly but are independent of Rac1, Arp2/3 complex, myosin, or microtubules. Rac1 positively regulates the frequency of initiation of long pseudopods, which promote migration speed and directional plasticity. Scar/WAVE and Arp2/3 complex drive actin assembly for long pseudopod extension, which also depends on microtubule dynamics. Myosin contractility balances the extension of long pseudopods by effecting retraction and allowing force generation for movement through the complex 3D epidermal environment.