[HTML][HTML] Coordination of limb development by crosstalk among axial patterning pathways

I Delgado, M Torres - Developmental biology, 2017 - Elsevier
I Delgado, M Torres
Developmental biology, 2017Elsevier
Vertebrate limb development relies on the activity of signaling centers that promote growth
and control patterning along three orthogonal axes of the limb bud. The apical ectodermal
ridge, at the distal rim of the limb bud ectoderm, produces WNT and FGF signals, which
promote limb bud growth and progressive distalization. The zone of polarizing activity, a
discrete postero-distal mesenchymal domain, produces SHH, which stimulates growth and
organizes patterning along the antero-posterior axis. The dorsal and ventral ectoderms …
Abstract
Vertebrate limb development relies on the activity of signaling centers that promote growth and control patterning along three orthogonal axes of the limb bud. The apical ectodermal ridge, at the distal rim of the limb bud ectoderm, produces WNT and FGF signals, which promote limb bud growth and progressive distalization. The zone of polarizing activity, a discrete postero-distal mesenchymal domain, produces SHH, which stimulates growth and organizes patterning along the antero-posterior axis. The dorsal and ventral ectoderms produce, respectively, WNT7A and BMPs, which induce dorso-ventral limb fates. Interestingly, these signaling centers and the mechanisms they instruct interact with each other to coordinate events along the three axes. We review here the main interactions described between the three axial systems of the developing limb and discuss their relevance to proper limb growth and patterning.
Elsevier