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. 1983;2(8):1281–1290. doi: 10.1002/j.1460-2075.1983.tb01582.x

Stage-specific protein synthesis during early embryogenesis in Drosophila melanogaster.

R J Trumbly 1, B Jarry 1
PMCID: PMC555273  PMID: 10872321

Abstract

The changes in protein species synthesized during early Drosophila embryogenesis were characterized by two-dimensional electrophoresis. Of the 261 proteins scored, 68 (26%) show dramatic changes in rates of synthesis during the first 8 h of embryogenesis. These stage-specific proteins can be classified into three categories: early, detected at 1, 2 and 3 h but not later; late, not detected at 1 h, but appearing later; and discontinuous, detected before and after, but not at 3 and 4 h. RNA was extracted from three representative stages, translated in vitro, and the translation products separated on two-dimensional gels. There was a strong correlation between the patterns of synthesis in vivo and in vitro, suggesting that the early proteins are translated from maternal mRNA, and the late proteins from zygotic mRNA. A thorough comparison was made between the proteins synthesized in wild-type and dorsal embryos, in which virtually only dorsal hypoderm differentiates. The first observed difference was a reduced synthesis of actin I at 8 h, indicating that the absence of mesodermal and endodermal tissues is not detectable at the level of moderately abundant protein until the onset of differentiation.

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