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Updated: Dec 29, 2025

A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
Published on: May 22, 2019
A novel Xist RNA-mediated chromosome inactivation model using a mouse artificial chromosome
Daigo Inaoka1, Naohiro Sunamura1, Takahito Ohira1,2
1Department of Biomedical Science, Institute of Regenerative Medicine and Biofunction, Graduate School of Medical Science, Tottori University, 86 Nishi-cho, Yonago, Tottori, 683-8503, Japan.
Objective:
To develop a mouse artificial chromosome (MAC) carrying the mouse Xist gene (X-inactive specific transcript; Xist-MAC) as a systematic in vitro approach for investigating Xist RNA-mediated chromosome inactivation.
Results:
Ectopic expression of the Xist gene in CHO cells led to the accumulation of Xist RNA in cis on the MAC. In addition, the introduction of Xist-MAC to embryonic stem cells from male mice via microcell-mediated chromosome transfer resulted in the accumulation of Xist RNA in cis on the MAC. Chromosomal inactivation was observed in the differentiated state. Moreover, this phenomenon was accompanied by the epigenetic modification of H3K27 trimethylation.
Conclusions:
We successfully generated a novel chromosome inactivation model, Xist-MAC, which will provide a valuable tool for the screening and functional analysis of X chromosome inactivation-related genes and proteins.
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