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Related Concept Videos

Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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DNA in a human cell is almost 2m long and it is packed inside a tiny nucleus that is only a few microns in diameter. The level of compaction of DNA inside the nucleus is astonishing. It is organized into several sequentially higher levels of compaction to fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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The Nucleosome02:33

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Repetitive DNA elements, nucleosome binding and human gene expression.

Ahsan Huda1, Leonardo Mariño-Ramírez, David Landsman

  • 1School of Biology, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Gene
|April 28, 2009
PubMed
Summary
This summary is machine-generated.

Repetitive DNA elements, like transposable elements (TEs) and simple sequence repeats (SSRs), influence human gene regulation by affecting chromatin accessibility. Their distribution in promoters correlates with gene expression patterns and functions.

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Area of Science:

  • Epigenetics and Gene Regulation
  • Genomics and Bioinformatics

Background:

  • Repetitive DNA elements, including transposable elements (TEs) and simple sequence repeats (SSRs), constitute a significant portion of the human genome.
  • The role of these repetitive sequences in the epigenetic regulation of gene expression, particularly within promoter regions, remains an area of active investigation.

Purpose of the Study:

  • To investigate the epigenetic contributions of repetitive DNA elements to human gene regulation.
  • To analyze the distribution patterns of TEs and SSRs in human proximal promoter sequences and their correlation with gene expression.

Main Methods:

  • Bioinformatic analysis of human proximal promoter sequences to determine the distribution of TEs and SSRs relative to transcriptional start sites (TSSs).
  • Correlation analysis between repetitive DNA content, nucleosome binding affinities, and gene expression levels.
  • Comparison of gene expression patterns and protein functions for genes with similar or dissimilar repetitive DNA promoter profiles.

Main Results:

  • TEs are enriched distal to TSSs, decreasing in frequency towards the core promoter, while SSRs increase in frequency approaching the TSS, peaking near the -35 bp site.
  • Repetitive DNA distribution correlates with nucleosome occupancy, with higher TE content associated with lower nucleosome binding and increased gene expression.
  • Promoters with similar repetitive DNA profiles regulate genes with more similar expression patterns and functions, and distinct profiles correlate with tissue-specific expression.

Conclusions:

  • Repetitive DNA elements play a crucial role in mediating chromatin accessibility within proximal promoter regions.
  • The repeat content of human promoters is a significant determinant of gene expression levels, patterns, and associated protein functions.