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Autonomous Control of Cell and Organ Size by CHICO, a Drosophila Homolog of Vertebrate IRS1–4

The control of growth is fundamental to the developing metazoan. Here, we show that CHICO, a Drosophila homolog of vertebrate IRS1–4, plays an essential role in the control of cell size and growth. Animals mutant for chico are less than half the size of wild-type flies, owing to fewer and smaller ce...

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Published in:Cell 1999-06, Vol.97 (7), p.865-875
Main Authors: Böhni, Ruth, Riesgo-Escovar, Juan, Oldham, Sean, Brogiolo, Walter, Stocker, Hugo, Andruss, Bernard F, Beckingham, Kathy, Hafen, Ernst
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creator Böhni, Ruth
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description The control of growth is fundamental to the developing metazoan. Here, we show that CHICO, a Drosophila homolog of vertebrate IRS1–4, plays an essential role in the control of cell size and growth. Animals mutant for chico are less than half the size of wild-type flies, owing to fewer and smaller cells. In mosaic animals, chico homozygous cells grow slower than their heterozygous siblings, show an autonomous reduction in cell size, and form organs of reduced size. Although chico flies are smaller, they show an almost 2-fold increase in lipid levels. The similarities of the growth defects caused by mutations in chico and the insulin receptor gene in Drosophila and by perturbations of the insulin/IGF1 signaling pathway in vertebrates suggest that this pathway plays a conserved role in the regulation of overall growth by controling cell size, cell number, and metabolism.
doi_str_mv 10.1016/S0092-8674(00)80799-0
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source Elsevier ScienceDirect Journals
subjects Amino Acid Sequence
Animals
Apoptosis
Body Constitution
Carrier Proteins
Cell Count
Cell Size
Drosophila
Drosophila - genetics
Drosophila - metabolism
Drosophila - physiology
Drosophila Proteins
Female
Insect Proteins - genetics
Insect Proteins - metabolism
Insulin Receptor Substrate Proteins
Intracellular Signaling Peptides and Proteins
Lipid Metabolism
Male
Molecular Sequence Data
Mutagenesis
Phosphatidylinositol 3-Kinases - metabolism
Phosphoproteins - genetics
Phosphoproteins - metabolism
Receptor, Insulin - genetics
Receptor, Insulin - metabolism
Sequence Homology, Amino Acid
Vertebrates
title Autonomous Control of Cell and Organ Size by CHICO, a Drosophila Homolog of Vertebrate IRS1–4
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