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Protein signal is crucial for accurate control of insect size
Date:5/4/2012

HEIDELBERG, 4 May 2012 Two independent groups of researchers have identified a hormone that is responsible for keeping the growth and development of insects on track. The results, which are reported in the journal Science, suggest that Dilp8 provides an important signal to slow body growth and delay insect development. This braking effect is an essential part of normal development since it allows sufficient time for tissues to form and the correct body size, proportions and symmetry to be achieved.

"The important question about the control of animal size is knowing when to stop," said EMBO Member Maria Dominguez, lead author of one of the papers and Professor at the Institute of Neurosciences in Alicante, Spain. "To achieve the required precision in the control of growth, organs within the body of an insect must be capable of sensing their own size and communicating their dimensions to other organs in the body and to the endocrine system." She added: "Our work with Drosophila suggests that growing organs and tissues produce a secreted peptide known as Dilp8. This hormone coordinates the growth rate of different organs in the body and is capable of delaying important developmental steps such as metamorphosis. In healthy flies, this additional time is essential to ensure that functional tissues are established and for organs to reach normal size. It also ensures that organs maintain perfect bilateral symmetry."

Dominguez and collaborators examined tumours in the eye discs of Drosophila, parts of the insect body that go on to generate fully formed eyes in mature adult flies. Developing flies often adjust growth and the timing of metamorphosis to compensate for the disturbance induced by tumours or injury. The researchers wanted to investigate if a shared molecular signal was responsible for these observations. "Our work identifies Dilp8 as a signal that communicates the growth status of tissues as well as local responses
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Contact: Barry Whyte
barry.whyte@embo.org
49-622-188-91108
European Molecular Biology Organization
Source:Eurekalert  

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