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X-Inactivation

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-inactivation

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 Structures

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...

Autoimmune Disorders

Autoimmune Disorders

Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
Concept and Mechanism of Autoimmune Diseases
The immune system...

X and Y Chromosomes

X and Y Chromosomes

Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...

Epigenetic Regulation

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

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Related Experiment Video

Updated: Jun 21, 2026

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity

Published on: April 11, 2019

X chromosome inactivation and autoimmunity.

Wesley H Brooks¹

¹Experimental HTS, Drug Discovery, H. Lee Moffitt Cancer Center & Research Institute, Tampa, FL 33612-9416, USA. wesley.brooks@moffitt.org

Clinical Reviews in Allergy & Immunology

|August 5, 2009

Summary

Autoimmune diseases disproportionately affect females, suggesting a role for the X chromosome. X chromosome inactivation, an epigenetic process, may contribute to these disorders when its regulation is disrupted.

Area of Science:

Immunology
Genetics
Epigenetics

Background:

Autoimmune diseases involve genetics, epigenetics, environment, and aging.
Females are predominantly affected by autoimmune diseases, hinting at X chromosome involvement.
X chromosome inactivation is a complex epigenetic regulation of X-linked gene expression in females.

Purpose of the Study:

To explore the role of X chromosome and X chromosome inactivation in autoimmune disease development.
To discuss the unique epigenetic control of X-linked genes and its potential disruption.

Main Methods:

Review of current literature on X chromosome inactivation and autoimmune diseases.
Analysis of epigenetic mechanisms and gene expression modulation on the X chromosome.

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

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

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

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

Published on: May 22, 2019

Related Experiment Videos

Last Updated: Jun 21, 2026

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity

Published on: April 11, 2019

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

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

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

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

Published on: May 22, 2019

Main Results:

The X chromosome and its inactivation process present unique regulatory mechanisms.
Disruption in the regulation of X chromosome inactivation may lead to autoimmune disorders.

Conclusions:

X chromosome inactivation is a critical epigenetic process potentially implicated in the sex bias of autoimmune diseases.
Further research into X chromosome inactivation mechanisms could reveal novel therapeutic targets for autoimmune conditions.