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What is Gene Expression?01:42

What is Gene Expression?

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
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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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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...
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Neuronal activity-dependent gene expression is stimulus-specific and changes with neuronal maturation.

Jeronimo Lukin1, Maximiliano S Beckel2,3, Olivia Pedroncini1

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Summary

Neuronal development stage and stimulation method significantly alter gene expression. Different stimuli like KCl, Bicuculline, and TTX-withdrawal induce unique transcriptional profiles in mature neurons.

Keywords:
BicucullineKClTTX withdrawalactivity-regulated gene expressioncomparative transcriptomicsimmediate-early genesneuronal development

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Neuronal activity-dependent gene expression is crucial for brain function.
  • Previous studies often used early-stage neuronal cultures (7-10 DIV) with various stimulation protocols.
  • The impact of neuronal maturation and specific stimuli (KCl, Bicuculline, TTX-withdrawal) on gene expression remains under-investigated.

Purpose of the Study:

  • To investigate how neuronal maturation (7 DIV vs. 21 DIV) affects activity-induced transcription.
  • To compare the transcriptional responses to different stimulation protocols (KCl, Bicuculline, TTX-withdrawal) in mature neurons.
  • To elucidate the influence of distinct firing patterns on gene expression profiles.

Main Methods:

  • Primary neuronal cultures at 7 and 21 days in vitro (DIV) were used.
  • Neurons were stimulated with potassium chloride (KCl) and bicuculline (Bic).
  • Transcriptional changes in mature neurons (21 DIV) were analyzed using RNA-Sequencing (RNA-Seq) after KCl, Bic, and TTX-withdrawal (TTXw) treatments.

Main Results:

  • Neuronal developmental stage profoundly impacts neuronal firing and gene expression.
  • KCl and Bicuculline stimulation yielded markedly different transcriptional outcomes, challenging prior assumptions of equivalence.
  • Distinct stimuli (KCl, Bic, TTXw) in mature neurons induced specific transcriptional profiles with unique temporal dynamics and gene group activation.

Conclusions:

  • Neuronal maturation and specific activation protocols are critical factors in activity-induced gene expression studies.
  • Different firing patterns generated by various stimuli lead to distinct gene expression profiles.
  • Findings provide insights into transcription-dependent plasticity mechanisms and highlight the need for careful experimental design.