Functional and regulatory interactions between Hox and extradenticle genes

AUTOR(ES)

Azpiazu, Natalia

FONTE

Cold Spring Harbor Laboratory Press

RESUMO

The homeobox gene extradenticle (exd) acts as a cofactor of Hox function both in Drosophila and vertebrates. It has been shown that the distribution of the Exd protein is developmentally regulated at the post-translational level; in the regions where exd is not functional Exd is present only in the cell cytoplasm, whereas it accumulates in the nuclei of cells requiring exd function. We show that the subcellular localization of Exd is regulated by the BX-C genes and that each BX-C gene can prevent or reduce nuclear translocation of Exd to different extents. In spite of this negative regulation, two BX-C genes, Ultrabithorax and abdominal-A, require exd activity for their maintenance and function. We propose that mutual interactions between Exd and BX-C proteins ensure the correct amounts of interacting molecules. As the Hoxd10 gene has the same properties as Drosophila BX-C genes, we suggest that the control mechanism of subcellular distribution of Exd found in Drosophila probably operates in other organisms as well.

Documentos Relacionados

• Regulatory interactions between mitochondrial genes: interactions between two mosaic genes.
• Conservation of a functional hierarchy between mammalian and insect Hox/HOM genes.
• The control of trunk Hox specificity and activity by Extradenticle
• Branched pattern of regulatory interactions between late sporulation genes in Bacillus subtilis.
• HOX4 genes encode transcription factors with potential auto- and cross-regulatory capacities.