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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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What is Gene Expression?01:42

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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.
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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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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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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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Related Experiment Video

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Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
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Matrix mineralization controls gene expression in osteoblastic cells.

Johannes Wischmann1, Florian Lenze1, Antonia Thiel1

  • 1Department of Orthopedics, Klinikum rechts der Isar, Technical University Munich, 81675 Munich, Germany.

Experimental Cell Research
|September 9, 2018
PubMed
Summary

Osteoblasts respond differently to mineralized and demineralized bone surfaces. Mineralization state independently controls osteoblast gene expression, favoring protein synthesis on mineralized surfaces and matrix formation on demineralized ones.

Keywords:
BoneBone matrixBone mineralGene RegulationOsteoblast

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biomaterials

Background:

  • Osteoblasts are crucial for bone health, adhering to both mineralized and non-mineralized bone surfaces.
  • The specific responses of osteoblasts to varying matrix mineralization states are not fully understood.
  • This study investigates the functional signaling of matrix mineralization to osteoblasts.

Purpose of the Study:

  • To compare osteoblast gene expression profiles on mineralized versus demineralized osseous surfaces.
  • To elucidate the role of matrix mineralization in directing osteoblast behavior.
  • To identify specific gene sets regulated by the mineralization state of bone.

Main Methods:

  • Development and validation of a novel tissue surface model comparing mineralized and demineralized osseous surfaces.
  • Molecular characterization of the surfaces, confirming similarity except for mineral content.
  • Genome-wide gene set enrichment analysis (GSEA) of human osteoblastic cell line (MG63) gene expression on both surfaces.

Main Results:

  • Mineralized surfaces showed enrichment of gene sets related to protein synthesis.
  • Demineralized surfaces exhibited enrichment of gene sets associated with matrix formation, including structural components and migration guides (e.g., HMCN1, NID2).
  • The mineralization state of bone was identified as an independent regulator of osteoblast gene expression.

Conclusions:

  • Mineralized osseous surfaces promote intracellular protein production in osteoblasts.
  • Demineralized osseous surfaces favor matrix formation and cell migration guidance in osteoblasts.
  • Bone matrix mineralization state independently controls osteoblast gene expression, influencing distinct cellular functions.