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Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

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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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Cell Specific Gene Expression01:58

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Export of Mitochondrial and Chloroplast Genes02:19

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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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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
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...
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What is Gene Expression?01:36

What is Gene Expression?

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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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Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Updated: Feb 15, 2026

Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans
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Mitochondrial levels determine variability in cell death by modulating apoptotic gene expression.

Silvia Márquez-Jurado1, Juan Díaz-Colunga1, Ricardo Pires das Neves2

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Biochemistry

Background:

  • Fractional tumor cell killing contributes to chemotherapy resistance.
  • Variable resistance occurs even in genetically identical cells within uniform environments.

Purpose of the Study:

  • Investigate individual cell responses to TRAIL-induced apoptosis.
  • Understand the role of mitochondrial content in chemotherapy resistance.

Main Methods:

  • Live-cell microscopy of HeLa cells.
  • Computational modeling of apoptotic networks.
  • Analysis of colon cancer biopsies.

Main Results:

  • Higher mitochondrial content correlates with increased apoptosis and faster cell death.
  • Mitochondrial content modulates expression of apoptotic proteins.
  • Mitochondria act as global regulators of apoptotic protein expression.

Conclusions:

  • Mitochondrial content is a key determinant of apoptotic fate and drug resistance.
  • Mitochondria play a critical regulatory role in apoptosis.
  • Findings may inform strategies to overcome chemotherapy resistance.