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Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Related Experiment Video

Updated: Apr 30, 2026

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
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The RNA-binding protein ELAV regulates Hox RNA processing, expression and function within the Drosophila nervous

Ana Rogulja-Ortmann1, Joao Picao-Osorio, Casandra Villava

  • 1Institute of Genetics, University of Mainz, Mainz D-55099, Germany.

Development (Cambridge, England)
|May 8, 2014
PubMed
Summary

The RNA-binding protein ELAV regulates Hox gene expression in the Drosophila central nervous system (CNS) by controlling RNA processing. This regulation is crucial for cell differentiation and CNS development.

Keywords:
Alternative polyadenylation (APA)Alternative splicingCentral nervous systemDrosophilaELAV/HuHoxRNA processingRNA-binding proteinSegment-specific apoptosis

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Area of Science:

  • Developmental Biology
  • Neuroscience
  • Genetics

Background:

  • Hox genes establish axial identity and control cell differentiation programs.
  • Regulation of Hox gene expression via RNA processing is poorly understood.
  • The pan-neural RNA-binding protein ELAV (Hu antigen) is implicated in neural development.

Purpose of the Study:

  • To investigate the role of ELAV in regulating Hox gene expression and RNA processing in the Drosophila embryonic central nervous system (CNS).
  • To define the cellular function of ELAV in CNS development.
  • To explore the contribution of ELAV-dependent regulation to cell type-specific Hox expression.

Main Methods:

  • Biochemical assays to detect ELAV binding to Ubx RNA.
  • Genetic manipulation of ELAV in Drosophila embryos.
  • Imaging techniques to assess protein expression and cellular changes.
  • Analysis of other Hox gene expression in elav mutant embryos.

Main Results:

  • ELAV directly binds to Ultrabithorax (Ubx) RNA within the embryonic CNS.
  • Loss of ELAV reduces Ubx protein expression, leading to altered cellular subroutines.
  • Artificial expression of ELAV in glial cells promotes Ubx expression.
  • Expression of abdominal A and Abdominal B Hox genes is reduced in elav mutants, but Antennapedia is unaffected.

Conclusions:

  • ELAV regulates Ubx RNA processing, impacting CNS development and cell differentiation.
  • ELAV-dependent regulation of Hox genes contributes to cell type-specific expression patterns in the CNS.
  • Modulation of Hox RNA processing by ELAV adapts CNS morphogenesis to axial level by regulating neural differentiation programs.