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Related Concept Videos

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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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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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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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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Related Experiment Video

Updated: Jan 25, 2026

An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Chromatin three-dimensional interactions mediate genetic effects on gene expression.

O Delaneau1,2,3, M Zazhytska4, C Borel1,3

  • 1Department of Genetic Medicine and Development, University of Geneva, Geneva, Switzerland.

Science (New York, N.Y.)
|May 4, 2019
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Summary
This summary is machine-generated.

Genetic variation impacts gene regulation by influencing regulatory element activity within structured chromatin domains. These networks control gene expression and mediate genetic effects on genes.

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Area of Science:

  • Genomics
  • Epigenetics
  • Human Genetics

Background:

  • Understanding genetic variation's role in gene expression and chromatin organization is crucial for human genome function.
  • Genetic variability influences the human genome's structure and function.

Purpose of the Study:

  • To investigate how genetic variation perturbs gene regulation.
  • To analyze the relationship between regulatory element activity, gene expression, genetic variants, and chromatin organization.

Main Methods:

  • Utilized a dataset combining regulatory element activity, gene expression, and genetic variants from 317 individuals and two cell types.
  • Analyzed intra- and interchromosomal structures within cis-regulatory domains and trans-regulatory hubs.
  • Correlated regulatory structures with local (TADs) and global (chromatin compartments) nuclear organization.

Main Results:

  • Regulatory activity variation is structured within cis-regulatory domains and trans-regulatory hubs.
  • These structures reflect local and global chromatin organization.
  • Cell type-specific regulatory networks controlling gene expression and coexpression were identified.

Conclusions:

  • Chromatin organization structures regulatory activity and gene expression networks.
  • Genetic variants' effects on genes are mediated through these structured regulatory networks.
  • This study provides insights into the genetic basis of gene regulation and human genome function.