Characterization of an in vitro 3D intestinal organoid model by using massive RNAseq-based transcriptome profiling

Area of Science:

• Cell Biology
• Genomics
• Developmental Biology

Background:

• Organoid culture is a valuable tool for disease modeling and complements animal studies.
• Organoids mimic in vivo tissue structure and cellular composition but may lose specific features in vitro.
• Understanding the influence of culture conditions on organoid transcriptomes is crucial.

Purpose of the Study:

• To comprehensively characterize the transcriptome of mouse gut organoids.
• To investigate the impact of in vitro culture on compartment-, age-, and gender-specific gene expression.
• To differentiate between cell-extrinsic and cell-intrinsic transcriptional programs in intestinal organoids.

Main Methods:

• RNA sequencing (RNA-seq) was employed for transcriptome-wide analysis.
• Mouse gut organoids were derived from different intestinal compartments, genders, and ages.
• Bioinformatic analysis was used to assess transcriptomic variance and identify key features.

Main Results:

• In vitro culture significantly influenced the global transcriptome of intestinal epithelial cells, accounting for ~60% of the total variance.
• Compartment-, age-, and gender-related transcriptional features were largely lost in culture, suggesting dependence on niche or systemic factors.
• Certain intrinsic transcriptional programs, including some compartment-specific and a subset of gender- and aging-related features, were maintained in vitro.

Conclusions:

• Organoid culture profoundly impacts intestinal epithelial cell transcriptomes, necessitating careful interpretation of results.
• The study distinguishes between cell-extrinsic and cell-intrinsic transcriptional programs in the gut.
• Maintained intrinsic features in organoids offer avenues for studying specific biological processes in vitro.