Dpp signaling activity requires Pentagone to scale with tissue size in the growing Drosophila wing imaginal disc.

Abstract:

:The wing of the fruit fly, Drosophila melanogaster, with its simple, two-dimensional structure, is a model organ well suited for a systems biology approach. The wing arises from an epithelial sac referred to as the wing imaginal disc, which undergoes a phase of massive growth and concomitant patterning during larval stages. The Decapentaplegic (Dpp) morphogen plays a central role in wing formation with its ability to co-coordinately regulate patterning and growth. Here, we asked whether the Dpp signaling activity scales, i.e. expands proportionally, with the growing wing imaginal disc. Using new methods for spatial and temporal quantification of Dpp activity and its scaling properties, we found that the Dpp response scales with the size of the growing tissue. Notably, scaling is not perfect at all positions in the field and the scaling of target gene domains is ensured specifically where they define vein positions. We also found that the target gene domains are not defined at constant concentration thresholds of the downstream Dpp activity gradients P-Mad and Brinker. Most interestingly, Pentagone, an important secreted feedback regulator of the pathway, plays a central role in scaling and acts as an expander of the Dpp gradient during disc growth.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Hamaratoglu F,de Lachapelle AM,Pyrowolakis G,Bergmann S,Affolter M

doi

10.1371/journal.pbio.1001182

subject

Has Abstract

pub_date

2011-10-01 00:00:00

pages

e1001182

issue

10

eissn

1544-9173

issn

1545-7885

pii

PBIOLOGY-D-11-02056

journal_volume

9

pub_type

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