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Related Concept Videos

Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Euchromatin01:01

Euchromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
DNA Packaging00:58

DNA Packaging

Overview

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Chromatin landscape dictates HSF binding to target DNA elements.

Michael J Guertin1, John T Lis

  • 1Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America.

Plos Genetics
|September 17, 2010
PubMed
Summary
This summary is machine-generated.

Transcription factors (TFs) require active chromatin for binding. Drosophila Heat Shock Factor (HSF) binding is determined by chromatin state, not just DNA sequence, influencing gene expression patterns.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Transcription factors (TFs) regulate gene expression, but DNA binding alone doesn't determine in vivo binding.
  • TF binding occurs in a competitive environment with proteins like histones, impacting DNA accessibility.

Purpose of the Study:

  • To investigate the genome-wide distribution of Drosophila Heat Shock Factor (HSF) using ChIP-seq.
  • To determine the factors influencing HSF binding to its target DNA elements (HSEs).

Main Methods:

  • Chromatin immunoprecipitation followed by sequencing (ChIP-seq) to map HSF binding sites.
  • Analysis of ModENCODE ChIP-chip datasets to correlate HSF binding with chromatin marks.

Main Results:

  • HSF binds to 464 specific sites after heat shock, mostly containing HSEs, but many HSEs remain unbound.
  • Bound HSEs are associated with active chromatin marks (acetylation, H3K4me3, Pol II) prior to heat shock.
  • Inducible HSF binding is facilitated by transitioning chromatin from inactive to active states.

Conclusions:

  • Active chromatin marks are a primary determinant for inducible HSF binding to HSEs.
  • Chromatin landscape, not just DNA sequence, dictates TF binding specificity in vivo.
  • Understanding TF-chromatin interactions is crucial for deciphering gene expression regulation.