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Related Concept Videos

Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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 DNA...
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...
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...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
X-Inactivation01:58

X-Inactivation

The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.

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Related Experiment Video

Updated: May 19, 2026

Isolation and Characterization of Mouse Antral Oocytes Based on Nucleolar Chromatin Organization
07:16

Isolation and Characterization of Mouse Antral Oocytes Based on Nucleolar Chromatin Organization

Published on: January 7, 2016

Chromatin structure and ATRX function in mouse oocytes.

Rabindranath De La Fuente1, Claudia Baumann, Maria M Viveiros

  • 1Department of Physiology and Pharmacology, University of Georgia, Athens, GA 30602, USA. rfuente@uga.edu

Results and Problems in Cell Differentiation
|August 25, 2012
PubMed
Summary

The chromatin remodeling protein ATRX is crucial for accurate chromosome segregation in mammalian oocytes. Loss of ATRX function leads to aneuploidy and reduced fertility, highlighting its role in epigenetic control of oocyte development.

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Area of Science:

  • Reproductive biology
  • Epigenetics
  • Molecular genetics

Background:

  • Oocyte chromatin structure is vital for meiotic and developmental potential.
  • Chromosome segregation errors in female meiosis cause aneuploidy and pregnancy loss.
  • ATRX (α-thalassemia mental retardation X-linked) protein is implicated in centromeric heterochromatin formation during meiosis.

Purpose of the Study:

  • To investigate the role of ATRX in mammalian oocyte meiosis and chromosome segregation.
  • To elucidate the epigenetic mechanisms underlying ATRX function in maintaining oocyte developmental potential.
  • To explore the clinical implications of ATRX in human oocyte aneuploidy.

Main Methods:

  • Analysis of ATRX function in mammalian oocytes.
  • Assessment of chromosome morphology and segregation accuracy during meiosis.
  • Evaluation of histone modifications and heterochromatin formation.
  • Investigation of centromeric integrity and pericentric heterochromatin (PCH) maintenance.

Main Results:

  • ATRX binds to centromeric heterochromatin in oocytes, essential for accurate chromosome segregation.
  • Loss of ATRX function results in abnormal chromosome morphology, reduced histone H3 phosphorylation, and increased aneuploidy.
  • Centromeric breaks observed during early embryonic mitosis suggest ATRX's epigenetic role in chromatin modification and condensation.
  • Evidence supports a link between centromeric and PCH in epigenetic control of centromere function and chromosome stability.

Conclusions:

  • ATRX is a critical epigenetic regulator of centromere function and chromosome stability in mammalian oocytes.
  • Understanding ATRX's meiotic role is key to addressing epigenetic factors contributing to human oocyte aneuploidy.
  • Targeting ATRX-mediated pathways may offer insights into preventing pregnancy loss due to meiotic errors.