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Euchromatin

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...

Euchromatin

Euchromatin

Interphase

Interphase

The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.

Interphase

Interphase

The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.
Phases of Interphase
Following each period of mitosis and cytokinesis, eukaryotic cells enter interphase, during which they grow and replicate...

Interphase

Interphase

Interphase

Interphase

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RNA-Associated Chromatin DNA-DNA Interaction Method

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Interfase de la cromatina LINEd con el ARN.

Ryu-Suke Nozawa¹, Nick Gilbert¹

¹MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, The University of Edinburgh, Crewe Road, Edinburgh EH4 2XU, UK.

|March 4, 2014

Resumen

Este resumen es generado por máquina.

Los ARN no codificantes se asocian con los cromosomas y el andamio nuclear. Esto sugiere que el ARN juega un papel en el mantenimiento de la arquitectura de los cromosomas de interfase.

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Área de la Ciencia:

Biología Molecular Biología Molecular
Genética La genética.
Biología celular Biología celular.

Sus antecedentes:

La matriz nuclear es crucial para organizar el genoma dentro del núcleo.
El papel del ARN en la arquitectura nuclear ha sido hipotetizado pero no completamente aclarado.

Objetivo del estudio:

Para investigar la asociación de ARN no codificantes con la matriz nuclear y los cromosomas de interfase.
Para determinar si el ARN contribuye a la organización estructural de los cromosomas.

Principales métodos:

Fraccionamiento bioquímico para aislar componentes nucleares.
Análisis de la asociación de ARN con cromosomas aislados y andamios nucleares.
Identificación de tipos específicos de ARN, incluidos los derivados de los elementos LINE1.

Principales resultados:

Se encontró que los ARN no codificantes y repetitivos se asociaban de manera estable con los cromosomas interfásicos.
Estos ARN también fueron copurificados con el andamio nuclear.
La evidencia sugiere un vínculo directo entre ARN específicos y la estructura del cromosoma.

Conclusiones:

El ARN es un componente de la matriz nuclear.
Los ARN no codificantes, en particular los de elementos repetitivos como LINE1, son parte integral de la arquitectura del cromosoma interfase.
Estos hallazgos ponen de relieve un nuevo papel para el ARN en la organización del genoma.