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A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
Published on: May 22, 2019
Autosomal dominant mutations affecting X inactivation choice in the mouse
Ivona Percec1, Robert M Plenge, Joseph H Nadeau
1Howard Hughes Medical Institute and Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
Science (New York, N.Y.)
|May 11, 2002
Summary
Researchers identified new autosomal factors essential for X chromosome inactivation in mammals. These genetic mutations influence which X chromosome is silenced during early embryonic development.
Area of Science:
- Genetics
- Developmental Biology
- Mammalian Embryogenesis
Background:
- X chromosome inactivation equalizes gene expression between sexes in eutherian mammals.
- The X inactivation center (Xic) on the X chromosome controls which X is inactivated.
- Autosomal factors were previously hypothesized to be crucial for this process.
Purpose of the Study:
- To identify specific autosomal factors involved in X chromosome choice.
- To investigate the genetic control of X inactivation in early embryogenesis.
Main Methods:
- Chemical mutagenesis was employed in mice to induce mutations.
- Two distinct autosomal mutations affecting X chromosome choice were identified.
Main Results:
- Two novel autosomal mutations with dominant effects on X chromosome choice were discovered.
- These mutations impact the selection of the X chromosome for inactivation early in embryogenesis.
Conclusions:
- Autosomal factors play a critical role in regulating X chromosome inactivation.
- These findings provide new genetic insights into the complex mechanism of X chromosome choice.
