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Related Concept Videos

What is Gene Expression?01:42

What is Gene Expression?

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
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
What is Gene Expression?01:36

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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 processed and...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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...
Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
Skeletal Muscle Anatomy00:55

Skeletal Muscle Anatomy

Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.

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Related Experiment Video

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DNA Transfection of Mammalian Skeletal Muscles using In Vivo Electroporation
15:56

DNA Transfection of Mammalian Skeletal Muscles using In Vivo Electroporation

Published on: October 19, 2009

Gene expression in working skeletal muscle.

Hans Hoppeler1, Stephan Klossner, Martin Flück

  • 1Department of Anatomy, University of Bern, Bern, Switzerland. hoppeler@ana.unibe.ch

Advances in Experimental Medicine and Biology
|February 14, 2008
PubMed
Summary
This summary is machine-generated.

Molecular tools reveal how exercise changes muscle gene expression, leading to structural adaptations like increased mitochondria or myofibrillar proteins. This provides a detailed molecular signature of exercise responses.

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Area of Science:

  • Exercise physiology
  • Molecular biology
  • Muscle plasticity

Background:

  • Muscle cells respond to mechanical, metabolic, neuronal, and hormonal signals.
  • These signals are transduced to the muscle genome, influencing gene expression.
  • Exercise activates complex signaling cascades, leading to specific gene expression patterns.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying exercise-induced muscle plasticity.
  • To correlate exercise-induced gene expression changes with structural and functional muscle adaptations.
  • To explore the potential of molecular signatures to characterize exercise stimuli.

Main Methods:

  • Analysis of signaling pathways activated by exercise.
  • Identification of early and late gene responses to exercise.
  • Translation of messenger RNA (mRNA) into proteins.
  • Observation of structural changes in muscle tissue (e.g., mitochondrial volume, myofibrillar proteins).

Main Results:

  • Exercise triggers signaling cascades that alter gene transcription, including early genes like c-fos and jun.
  • Repeated exercise leads to mRNA and subsequent protein accretion, causing structural changes.
  • Different exercise types (endurance vs. strength) and training states produce distinct molecular signatures.
  • Hypoxic stress combined with endurance exercise in trained athletes yields a unique expressional adaptation signature.

Conclusions:

  • Molecular tools can provide a detailed signature of exercise stimuli, differentiating between exercise types and training status.
  • This molecular signature can be identified earlier and with greater precision than traditional functional or structural methods.
  • Understanding these molecular responses enhances our knowledge of muscle plasticity and adaptation to exercise.