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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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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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B Cell Activation and Differentiation01:24

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the...
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Related Experiment Video

Updated: Jan 25, 2026

3D Organotypic Co-culture Model Supporting Medullary Thymic Epithelial Cell Proliferation, Differentiation and Promiscuous Gene Expression
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HCF-2 inhibits cell proliferation and activates differentiation-gene expression programs.

Daria Gudkova1, Oleksandr Dergai1, Viviane Praz1,2

  • 1Center for Integrative Genomics, University of Lausanne, 1015 Lausanne, Switzerland.

Nucleic Acids Research
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Summary

Host-cell-factor-2 (HCF-2) protein has distinct nucleolar localization and functions compared to its paralog HCF-1. Increased HCF-2 inhibits cell proliferation and alters gene expression, suggesting divergent roles in cell regulation.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Evolutionary Biology

Background:

  • Host-cell-factor (HCF) proteins evolved via gene duplication in early vertebrates.
  • HCF-1 is a known chromatin-associated protein crucial for cell proliferation and differentiation.
  • The functions and localization of HCF-2 remain largely uncharacterized.

Purpose of the Study:

  • To investigate the cellular localization and distinct activities of HCF-2.
  • To compare HCF-2 functions with its paralog, HCF-1.
  • To elucidate the role of HCF-2 in cell proliferation, differentiation, and gene expression.

Main Methods:

  • Expression analysis of HCF-2 in human and mouse cells.
  • Functional assays involving HCF-2 synthesis and localization.
  • Gene expression profiling using HEK-293 cells.

Main Results:

  • HCF-2 is broadly expressed in human and mouse cells and localizes to the nucleoli, unlike HCF-1.
  • HCF-2's nucleolar localization is mediated by C-terminal Fibronectin type 3 repeats and can be inhibited by the HCF-1 nuclear localization signal.
  • Elevated HCF-2 levels in HEK-293 cells inhibit cell proliferation, cause mitotic defects, and alter gene expression programs related to metabolism, differentiation, and morphogenesis.

Conclusions:

  • HCF-2 possesses distinct cellular localization and functions compared to HCF-1.
  • The HCF protein family has evolved into two members with opposing roles in nuclear/nucleolar localization and cell cycle regulation.
  • HCF-2 plays a significant role in regulating cell proliferation, differentiation, and gene expression.