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Related Concept Videos

X-Inactivation01:58

X-Inactivation

38.9K
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.
38.9K
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

6.3K
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...
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Heterochromatin02:38

Heterochromatin

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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...
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Dosage Compensation02:50

Dosage Compensation

6.2K
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...
6.2K
Euchromatin01:01

Euchromatin

7.0K
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...
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Epigenetic Regulation01:46

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: Aug 2, 2025

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

Raymond C Caylor1

  • 1Molecular Diagnostic Laboratory, Greenwood Genetic Center, Greenwood, South Carolina.

Current Protocols
|April 19, 2023
PubMed
Summary
This summary is machine-generated.

This study presents new protocols for analyzing X chromosome inactivation patterns. These methods use the androgen receptor gene and DNA methylation to assess X-linked genetic disorders and tumor clonality in females.

Keywords:
X chromosome inactivationclinicaldiagnosticmoleculartesting

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Quick Fluorescent In Situ Hybridization Protocol for Xist RNA Combined with Immunofluorescence of Histone Modification in X-chromosome Inactivation
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Quick Fluorescent In Situ Hybridization Protocol for Xist RNA Combined with Immunofluorescence of Histone Modification in X-chromosome Inactivation

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A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive 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
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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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Quick Fluorescent In Situ Hybridization Protocol for Xist RNA Combined with Immunofluorescence of Histone Modification in X-chromosome Inactivation
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Quick Fluorescent In Situ Hybridization Protocol for Xist RNA Combined with Immunofluorescence of Histone Modification in X-chromosome Inactivation

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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:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • X chromosome inactivation (XCI) is crucial for gene dosage compensation in females.
  • Assessing XCI patterns has clinical implications for X-linked disorders and cancer genetics.
  • Existing methods for XCI analysis can be complex and time-consuming.

Purpose of the Study:

  • To establish robust and efficient protocols for determining X chromosome inactivation patterns.
  • To provide tools for assessing tumor clonality and carrier status of X-linked conditions.
  • To evaluate the pathogenicity of genetic variants in X-linked genes.

Main Methods:

  • Utilizing the polymorphic trinucleotide repeat in the first exon of the human androgen receptor (AR) gene.
  • Employing the methylation-sensitive restriction enzyme HpaII to differentiate parental alleles and their methylation status.
  • Implementing Polymerase Chain Reaction (PCR) for amplification and labeling of digested and undigested DNA.

Main Results:

  • The developed protocols accurately distinguish between maternal and paternal alleles.
  • Simultaneous determination of allele methylation status is achieved.
  • Calculation of the XCI ratio allows for the identification of random or nonrandom inactivation patterns.

Conclusions:

  • The presented protocols offer a reliable method for XCI pattern analysis.
  • These assays are valuable for clinical applications including genetic diagnostics and oncology.
  • The findings contribute to a better understanding of XCI in female genetics.