Related Experiment Video

Updated: Aug 23, 2026

A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
08:27

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

Published on: May 22, 2019

Comparative sequence and x-inactivation analyses of a domain of escape in human xp11.2 and the conserved segment in

Karen D Tsuchiya1, John M Greally, Yajun Yi

  • 1Division of Genetic Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA. karen.tsuchiya@seattlechildrens.org

Genome Research
|June 16, 2004
PubMed

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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.
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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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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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