Affordable Access

Distribution of polarizing activity and potential for limb formation in mouse and chick embryos and possible relationships to polydactyly.

Authors
  • Tanaka, M
  • Cohn, M J
  • Ashby, P
  • Davey, M
  • Martin, P
  • Tickle, C
Type
Published Article
Journal
Development (Cambridge, England)
Publication Date
Sep 01, 2000
Volume
127
Issue
18
Pages
4011–4021
Identifiers
PMID: 10952899
Source
Medline
License
Unknown

Abstract

A central feature of the tetrapod body plan is that two pairs of limbs develop at specific positions along the head-to-tail axis. However, the potential to form limbs in chick embryos is more widespread. This could have implications for understanding the basis of limb abnormalities. Here we extend the analysis to mouse embryos and examine systematically the potential of tissues in different regions outside the limbs to contribute to limb structures. We show that the ability of ectoderm to form an apical ridge in response to FGF4 in both mouse and chick embryos exists throughout the flank as does ability of mesenchyme to provide a polarizing region signal. In addition, neck tissue has weak polarizing activity. We show, in chick embryos, that polarizing activity of tissues correlates with the ability either to express Shh or to induce Shh expression. We also show that cells from chick tail can give rise to limb structures. Taken together these observations suggest that naturally occurring polydactyly could involve recruitment of cells from regions adjacent to the limb buds. We show that cells from neck, flank and tail can migrate into limb buds in response to FGF4, which mimics extension of the apical ectodermal ridge. Furthermore, when we apply simultaneously a polarizing signal and a limb induction signal to early chick flank, this leads to limb duplications.

Report this publication

Statistics

Seen <100 times