An autoregulatory feedback loop directs the localized expression of the Drosophila CPEB protein Orb in the developing oocyte

L. Tan, J. S. Chang, A. Costa, Paul Daniel Schedl

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

The RRM-type RNA binding protein Orb plays a central role in the establishment of polarity in the Drosophila egg and embryo. In addition to its role in the formation and initial differentiation of the egg chamber, orb is required later in oogenesis for the determination of the dorsoventral (DV) and anteroposterior (AP) axes. In DV axis formation, Orb protein is required to localize and translate gurken mRNA at the dorsoanterior part of the oocyte. In AP axis formation, Orb is required for the translation of oskar mRNA. In each case, Orb protein is already localized at the appropriate sites within the oocyte before the arrival of the mRNAs encoding axis determinants. We present evidence that an autoregulatory mechanism is responsible for directing the on site accumulation of Orb protein in the Drosophila oocyte. This orb autoregulatory activity ensures the accumulation of high levels of Orb protein at sites in the oocyte that contain localized orb message.

Original languageEnglish (US)
Pages (from-to)1159-1169
Number of pages11
JournalDevelopment
Volume128
Issue number7
StatePublished - May 15 2001

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Developmental Biology

Keywords

  • Autoregulation
  • Drosophila
  • Oogenesis
  • Orb
  • Translation

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