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X-Inactivation01:58

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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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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.
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Related Experiment Video

Updated: May 3, 2026

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.

Julie R Jones1

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

Current Protocols in Human Genetics
|February 11, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a method to analyze X chromosome inactivation patterns using the androgen receptor gene (AR). This technique helps determine random or nonrandom inactivation, crucial for genetic disorder assessment.

Keywords:
X chromosome inactivationclinicaldiagnosticmoleculartesting

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Area of Science:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • X chromosome inactivation is a key process in female mammals.
  • Understanding inactivation patterns is vital for diagnosing X-linked disorders and evaluating genetic variants.
  • Current methods may require refinement for precise allelic and methylation status determination.

Purpose of the Study:

  • To develop and validate protocols for analyzing X chromosome inactivation patterns.
  • To assess the clinical utility of X inactivation analysis in tumor clonality, carrier status, and variant pathogenicity.
  • To differentiate maternal and paternal alleles and their methylation status simultaneously.

Main Methods:

  • Utilized the polymorphic trinucleotide repeat in the first exon of the human androgen receptor gene (AR).
  • Employed the methylation-sensitive restriction enzyme HpaII for allelic discrimination and methylation analysis.
  • Calculated the ratio of inactivation between maternal and paternal alleles.

Main Results:

  • Successfully distinguished between maternal and paternal alleles of the AR gene.
  • Determined the methylation status of both alleles concurrently.
  • Established a method to quantify the X chromosome inactivation ratio.

Conclusions:

  • The developed protocols provide a robust method for assessing X chromosome inactivation.
  • This technique has significant clinical applications in genetic diagnostics and research.
  • The findings support the use of AR gene analysis for evaluating random vs. nonrandom X inactivation patterns.