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Related Concept Videos

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.
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.
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...
Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...
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...
Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...

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Related Experiment Video

Updated: Jun 17, 2026

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells
15:54

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

Published on: June 14, 2014

X-changing information on X inactivation.

Tahsin Stefan Barakat1, Iris Jonkers, Kim Monkhorst

  • 1Department of Reproduction and Development, Room Ee 09-71, Erasmus MC, PO Box 2040, 3000 CA Rotterdam, The Netherlands.

Experimental Cell Research
|January 20, 2010
PubMed
Summary
This summary is machine-generated.

X chromosome inactivation (XCI) ensures gene dosage balance in female mammals. This review details epigenetic mechanisms and factors like RNF12, OCT4, SOX2, and Nanog involved in XCI initiation.

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A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
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A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome

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Area of Science:

  • Epigenetics and Gene Regulation
  • Mammalian Genetics
  • Developmental Biology

Background:

  • X chromosome inactivation (XCI) equalizes X-linked gene dosage between sexes in mammals.
  • XCI employs epigenetic mechanisms such as DNA methylation and chromatin modification.
  • XCI serves as a model for studying epigenetic gene regulation.

Purpose of the Study:

  • To review recent findings on X chromosome counting and initiation of XCI.
  • To explain the roles of RNF12 and pluripotency factors in XCI.
  • To present these findings within a stochastic model framework.

Main Methods:

  • Literature review of existing and recent studies on XCI.
  • Analysis of epigenetic mechanisms involved in XCI.
  • Integration of findings into a stochastic model of XCI initiation.

Main Results:

  • RNF12 identified as a dose-dependent activator of XCI.
  • OCT4, SOX2, and Nanog implicated in suppressing XCI initiation.
  • A stochastic model integrating these factors provides a framework for understanding XCI initiation.

Conclusions:

  • Epigenetic regulation is crucial for XCI.
  • RNF12 and pluripotency factors play key roles in initiating or suppressing XCI.
  • A stochastic model offers insights into the complex process of XCI initiation and counting.