Modeling X chromosome inactivation using t5iLA naive human pluripotent stem cells

Area of Science:

• Epigenetics and Developmental Biology
• Stem Cell Biology
• Genetics

Background:

• X chromosome inactivation (XCI) is essential for gene dosage compensation in female mammals.
• Understanding early embryonic XCI requires a robust in vitro model.
• Human pluripotent stem cells (hPSCs) offer a promising system for studying XCI dynamics.

Purpose of the Study:

• To introduce an advanced framework for in-depth study of XCI using hPSCs.
• To investigate the role of XIST and epigenetic alterations in XCI.
• To model the transition between naive and primed pluripotent states during XCI.

Main Methods:

• Utilized dual fluorescent reporter hESC lines for real-time XCI tracking.
• Developed protocols for inducing X chromosome reactivation and inactivation.
• Employed flow cytometry, RNA FISH, and transcriptome sequencing for X status characterization.

Main Results:

• Successfully distinguished naive and primed hESCs based on XIST expression and reporter activity.
• Demonstrated the utility of hESC lines in modeling human XCI initiation and maintenance.
• Established conditions for random XCI induction and analyzed X chromosome reactivation.

Conclusions:

• Provided a detailed and reproducible methodology for in vitro XCI research using hPSCs.
• The framework advances the study of XCI mechanisms, with applications in developmental biology and disease modeling.
• Facilitates deeper understanding and potential manipulation of XCI dynamics.