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Development, Vol 114, Issue 4 959-963, Copyright © 1992 by Company of Biologists

JOURNAL ARTICLES

The mis-expression of posterior Hox-4 genes in talpid (ta3) mutant wings correlates with the absence of anteroposterior polarity

JC Izpisua-Belmonte, DA Ede, C Tickle and D Duboule
European Molecular Biology Laboratory, Heidelberg, FRG.

Developing chicken wings homozygous for the talpid (ta3/ta3) mutation are polydactylous and have defects in the establishment of their anteroposterior polarity. We analysed the expression domains of the posteriorly restricted homeobox Hox-4 genes in such mutant wings. The Hox-4 genes are now expressed right across the anteroposterior axis instead of being expressed just posteriorly. This correlates well with the absence of clear morphological differences between the talpid3 digits and reinforces the idea that vertebrate Hox-4 genes are involved in setting up the limb anteroposterior asymmetry.


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© The Company of Biologists Ltd 1992