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Related Concept Videos

Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Regulation of Expression Occurs at Multiple Steps02:24

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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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Regulation of Expression at Multiple Steps

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 addition of a...
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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Time-dependent gene expression analysis of the developing superior olivary complex.

Heike Ehmann1, Heiner Hartwich2, Christian Salzig3

  • 1From the Animal Physiology Group, Department of Biology, University of Kaiserslautern, D-67663 Kaiserslautern, Germany.

The Journal of Biological Chemistry
|July 30, 2013
PubMed
Summary

This study reveals sequential genetic programs guiding the development of the superior olivary complex (SOC), a key auditory relay. Findings highlight gene expression changes and identify hearing impairment-related genes within the SOC.

Keywords:
Auditory Processing DisorderCircuit DevelopmentDeafnessGenetic DiseasesNeurodevelopmentNeurodifferentiationNeuroprotectionRetrocochlear FunctionTranscription Factors

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Area of Science:

  • Neuroscience
  • Genetics
  • Auditory System Development

Background:

  • The superior olivary complex (SOC) is a critical auditory brainstem nucleus for sound localization.
  • Understanding the genetic basis of SOC maturation is essential for comprehending auditory processing development.

Purpose of the Study:

  • To identify the temporal gene expression patterns governing rat SOC development.
  • To pinpoint specific genes and genetic programs involved in SOC maturation and function.
  • To investigate the enrichment of hearing impairment-related genes in the SOC.

Main Methods:

  • Genome-wide microarray analysis of rat SOC transcriptomes at postnatal days P0, P4, P16, and P25.
  • Comparative transcriptome profiling of the whole brain at P4 and P25.
  • Bioinformatic analysis to identify differentially expressed genes and enriched genetic pathways.

Main Results:

  • Significant gene expression changes occur between P4 and P16, indicating rapid molecular specification around hearing onset.
  • The SOC exhibits a distinct molecular profile compared to the whole brain, with a notable enrichment of hearing impairment-related genes.
  • Transcription factors, crystallin-γ subunits, serotonin-related genes, voltage-gated channels, and G-proteins are dynamically regulated during SOC development.

Conclusions:

  • Sequential genetic programs orchestrate SOC development, with distinct molecular signatures emerging around hearing onset.
  • The identified genes provide candidates for guiding SOC development and ensuring proper auditory function.
  • Enrichment of hearing impairment genes in the SOC suggests central auditory structures may be more vulnerable to genetic defects than previously thought, impacting hearing restoration strategies.