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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.
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...
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

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 timing and level of...
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.
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: Jul 16, 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

Genomic environment predicts expression patterns on the human inactive X chromosome.

Laura Carrel1, Chungoo Park, Svitlana Tyekucheva

  • 1Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States of America. lcarrel@psu.edu

Plos Genetics
|October 3, 2006
PubMed
Summary

Genomic sequence patterns, particularly within Long Interspersed Nuclear Elements (L1s), significantly predict gene silencing on the inactive X chromosome in females. These patterns suggest L1s play a key role in X chromosome inactivation.

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Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells
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Published on: May 22, 2019

Area of Science:

  • Genetics
  • Epigenetics
  • Genomics

Background:

  • The regulation of gene expression on the inactive X chromosome (Xi) in mammalian females is not fully understood.
  • Long interspersed nuclear elements (L1s) are abundant on the X chromosome and are hypothesized to influence gene silencing.

Purpose of the Study:

  • To identify genomic features that determine gene expression status on the inactive X chromosome.
  • To develop a predictive model for gene expression on the Xi.

Main Methods:

  • Analysis of an experimentally derived inactivation profile of the human X chromosome.
  • Comparison of gene neighborhoods in different inactivation states within the Xp22 region.
  • Training a linear discriminant analysis classifier using enriched oligomers as features.

Main Results:

  • Gene expression status was predicted with 84% accuracy for active genes and 91% for inactive genes across the X chromosome.
  • Oligomers associated with gene inactivation were predominantly found within L1 elements, even in regions with low L1 frequency.
  • Specific L1 sequence regions, usually underrepresented, were enriched near inactivated genes.

Conclusions:

  • Genomic sequence elements, particularly within L1s, are crucial for X chromosome inactivation.
  • A complex chromatin microenvironment involving multiple genomic sequences dictates gene expression on the Xi.