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Related Concept Videos

Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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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.
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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
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Lampbrush Chromosomes01:51

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Updated: Aug 23, 2025

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo
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PlantCADB: A Comprehensive Plant Chromatin Accessibility Database.

Ke Ding1, Shanwen Sun2, Yang Luo3

  • 1State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, Harbin 150040, China; College of Information and Computer Engineering, Northeast Forestry University, Harbin 150040, China.

Genomics, Proteomics & Bioinformatics
|November 3, 2022
PubMed
Summary

Researchers created PlantCADB, a comprehensive plant chromatin accessibility database, to understand gene regulation in plant traits and stress responses. This resource aids in studying plant development, adaptation, and evolution.

Keywords:
Chromatin accessibilityPlantRegulatory networkStress responseTranscription factor footprint

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Area of Science:

  • Genomics
  • Plant Biology
  • Bioinformatics

Background:

  • Chromatin accessibility is crucial for understanding gene regulation and biological processes.
  • Large-scale chromatin accessibility data exists for mammals, advancing disease and development studies.
  • Understanding plant regulatory networks requires similar integrated resources.

Purpose of the Study:

  • To develop a comprehensive plant chromatin accessibility database (PlantCADB).
  • To facilitate the study of molecular mechanisms regulating plant traits, development, and stress responses.

Main Methods:

  • Compiled data from 649 samples across 37 plant species.
  • Collected samples related to abiotic stress, development, and tissue specificity.
  • Annotated 18,339,426 accessible chromatin regions (ACRs) with genomic data, genes, transcription factor footprints, motifs, and SNPs.

Main Results:

  • Developed PlantCADB, integrating diverse plant chromatin accessibility data.
  • Compiled and annotated over 18 million ACRs.
  • Included tools for visualization and analysis of ACRs and annotations.

Conclusions:

  • PlantCADB serves as an integrated, annotated resource for plant chromatin accessibility.
  • The database aids in understanding genetic regulatory networks in plants.
  • Facilitates research on plant development, traits, stress adaptation, and evolution.