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© Research
Publication : Developmental biology

Transgenic analysis of Hoxd gene regulation during digit development

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Developmental biology - 23 Mar 2007

Gonzalez F, Duboule D, Spitz F

Link to Pubmed [PMID] – 17448461

Dev. Biol. 2007 Jun;306(2):847-59

In tetrapods, posterior Hoxd genes (from groups 10 to 13) are necessary to properly pattern the developing autopods, including the number and identities of digits. Their coordinated expression is achieved by sharing a global control region (GCR), which was isolated and localized 200 kb 5′ (centromeric) of the gene cluster. However, in transgenic assays, the GCR was unable to fully recapitulate all aspects of the endogenous Hoxd expression patterns during distal limb development. In this paper, we further analyze the regulatory potential of this locus and report the characterization of Prox, a second enhancer element that contributes to the transcriptional activity of posterior Hoxd genes in developing distal limb buds. We show that the GCR and Prox elements complement each other and work in combination to correctly establish the late phase of Hoxd genes expression. Based on DNA sequence conservation and transgenic assays, we discuss the functions of these regulatory regions as well as a potential evolutionary scheme accounting for their emergence along with the evolution of tetrapod limbs.

http://www.ncbi.nlm.nih.gov/pubmed/17448461