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Generation and characterization of an ordered lambda clone array for the 460-kb region surrounding the murine Xist
C Rougeulle1, L Colleaux, B Dujon
1Unité de Génétique Moléculaire Murine, Institut Pasteur, Paris, France.
Summary
Researchers investigated the Xist gene
Area of Science:
- Genetics
- Molecular Biology
- Genomics
Background:
- The Xist gene is a key candidate for the X-inactivation center.
- Understanding the X-inactivation center's function is crucial for X chromosome regulation.
Purpose of the Study:
- To investigate the role of the Xist gene and its surrounding sequences in X-inactivation.
- To map the X-inactivation center candidate region in mice.
Main Methods:
- A 460-kb region around the murine Xist sequence was analyzed.
- Lambda contigs were created using IRS-PCR-based hybridization and YAC fragmentation.
- The orientation of Xist relative to the X chromosome's telomere and centromere was determined.
Main Results:
- A detailed map of the 460-kb region surrounding the murine Xist sequence was generated.
- The orientation of the Xist sequence was established.
- The orientation of Xist was found to be inverted compared to the human X chromosome.
Conclusions:
- The study provides a comprehensive map of the murine X-inactivation center candidate region.
- The determined orientation of Xist offers insights into its role in X-inactivation.
- Comparative orientation analysis between mouse and human Xist may reveal conserved regulatory mechanisms.