Developmental landmarks and cellular transitions during extravillous trophoblast cell differentiation

Area of Science:

• Reproductive Biology
• Developmental Biology
• Genomics

Background:

• Human trophoblast stem cells (TS) can be cultured and differentiated into extravillous trophoblast (EVT) cells.
• The molecular mechanisms regulating human TS cell self-renewal and differentiation into EVT cells remain largely uncharacterized.

Purpose of the Study:

• To define the transcriptomic landscape and identify key regulators during human TS cell differentiation into EVT cells.
• To characterize transitional cell populations and developmental trajectories during EVT cell lineage progression.

Main Methods:

• Bulk RNA-sequencing (RNA-seq) and single-cell RNA-sequencing (scRNA-seq) were employed.
• Analysis of human TS cells in stem state and at differentiation days 3, 6, and 8.
• Identification of cell populations, regulons, and developmental trajectories using scRNA-seq data.

Main Results:

• Distinct bulk and single-cell transcript profiles were observed across differentiation time points.
• Day 3 of differentiation emerged as a significant transition point.
• Several unique cell populations, developmental regulons, and trajectories were identified.
• Functional roles of key regulators, including cyclin B1, CEBPB, and ADAMTS20, were elucidated.

Conclusions:

• Developmental landmarks and transitional cell populations during EVT cell differentiation have been defined.
• This study provides a foundational resource for understanding TS cell differentiation into the EVT lineage.
• Key regulators of EVT development have been identified, offering targets for future research.