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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

7.5K
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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Chromatin Packaging02:21

Chromatin Packaging

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Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter? 
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order...
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Chromatin Packaging01:32

Chromatin Packaging

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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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Chromatin Packaging02:21

Chromatin Packaging

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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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
The writer...
9.5K
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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Video Experimental Relacionado

Updated: Jan 29, 2026

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
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Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions

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Interacciones de cromatina múltiple con precisión de una sola molécula

Meizhen Zheng1, Simon Zhongyuan Tian1, Daniel Capurso1

  • 1The Jackson Laboratory for Genomic Medicine, Farmington, CT, USA.

Nature
|February 20, 2019
PubMed
Resumen
Este resumen es generado por máquina.

ChIA-Drop es un nuevo método basado en gotas que mapea con precisión las interacciones complejas del genoma en 3D a nivel de una sola molécula. Esta técnica revela estructuras de cromatina altamente heterogéneas e interacciones centradas en el promotor, ofreciendo nuevas ideas sobre la regulación de la transcripción.

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Área de la Ciencia:

  • La genómica
  • Biología molecular
  • La epigenética

Sus antecedentes:

  • Los genomas de los organismos multicelulares se pliegan en territorios cromosómicos en 3D.
  • Los métodos de mapeo del genoma 3D existentes (Hi-C, ChIA-PET) utilizan la ligadura por pares y proporcionan datos a nivel de población, lo que limita el análisis detallado de la interacción.
  • Hi-C de una sola célula tiene problemas de escasez de datos, y la genómica basada en gotas no se ha aplicado a las interacciones de cromatina.

Objetivo del estudio:

  • Desarrollar un nuevo método para el análisis de la interacción cromatínica múltiple con precisión de una sola molécula.
  • Para superar las limitaciones de los métodos existentes a nivel de población y de células únicas escasas.
  • Investigar la heterogeneidad y la complejidad de las estructuras del genoma en 3D.

Principales métodos:

  • Desarrollado ChIA-Drop: una estrategia para el análisis de la interacción cromatina múltiple utilizando secuenciación basada en gotas y código de barras.
  • Se aplicó ChIA-Drop a las células de Drosophila.
  • Robustez demostrada en la captura de las interacciones complejas de la cromatina.

Principales resultados:

  • ChIA-Drop captura las interacciones complejas de la cromatina con precisión de una sola molécula, superando los métodos a nivel de población.
  • Las estructuras topológicas de la cromatina son predominantemente múltiples y altamente heterogéneas.
  • Reveló interacciones multivalentes centradas en el promotor, proporcionando información topológica sobre la transcripción.

Conclusiones:

  • ChIA-Drop permite una resolución sin precedentes en el análisis de la organización del genoma en 3D.
  • Los hallazgos destacan la naturaleza compleja y heterogénea de la topología de la cromatina.
  • Este método ofrece nuevos conocimientos topológicos sobre la regulación de la transcripción génica.