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Dev Cell. 2004 Mar;6(3):343-55.

Patterned gene expression directs bipolar planar polarity in Drosophila.

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  • 1Department of Molecular Biology, Princeton University, Lewis Thomas Lab, Washington Road, Princeton, NJ 08544, USA. jzallen@molbio.princeton.edu

Abstract

During convergent extension in Drosophila, polarized cell movements cause the germband to narrow along the dorsal-ventral (D-V) axis and more than double in length along the anterior-posterior (A-P) axis. This tissue remodeling requires the correct patterning of gene expression along the A-P axis, perpendicular to the direction of cell movement. Here, we demonstrate that A-P patterning information results in the polarized localization of cortical proteins in intercalating cells. In particular, cell fate differences conferred by striped expression of the even-skipped and runt pair-rule genes are both necessary and sufficient to orient planar polarity. This polarity consists of an enrichment of nonmuscle myosin II at A-P cell borders and Bazooka/PAR-3 protein at the reciprocal D-V cell borders. Moreover, bazooka mutants are defective for germband extension. These results indicate that spatial patterns of gene expression coordinate planar polarity across a multicellular population through the localized distribution of proteins required for cell movement.

PMID:
15030758
[PubMed - indexed for MEDLINE]
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