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Published on: March 15, 2013
Automated live-cell single-molecule tracking in enteroid monolayers reveals transcription factor dynamics probing
Nike Walther1, Sathvik Anantakrishnan2, Thomas G W Graham1
1Department of Molecular and Cell Biology, Li Ka Shing Center for Biomedical and Health Sciences, California Institute for Regenerative Medicine (CIRM) Center of Excellence, University of California, Berkeley, Berkeley, CA 94720, USA.
Investigating transcription factor (TF) dynamics in intestinal cells using live-cell single-molecule tracking revealed distinct behaviors for Hes1 and Hnf4g. Their differing diffusion patterns suggest roles in regulating intestinal cell differentiation progression.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Lineage transcription factors (TFs) are critical regulators of cell differentiation and tissue homeostasis.
- Understanding TF dynamics in adult tissues is essential for comprehending development and disease.
- Intestinal enteroid monolayers provide a valuable in vitro model for studying epithelial differentiation hierarchies.
Purpose of the Study:
- To investigate the dynamics of lineage-determining transcription factors during adult intestinal homeostasis in vitro.
- To correlate TF diffusion parameters with cellular morphology and differentiation status.
- To elucidate the distinct roles of Hes1 and Hnf4g in absorptive lineage commitment and enterocyte differentiation.
Main Methods:
- Established HILO-illumination-based live-cell single-molecule tracking (SMT) in mouse small intestinal enteroid monolayers.
- Developed an automated imaging and analysis pipeline for high-throughput analysis of 2D cell cultures.
- Quantified diffusion parameters and DNA-bound fractions for key transcription factors (Hes1 and Hnf4g).
Main Results:
- Observed contrasting diffusive behaviors between Hes1 and Hnf4g, independent of expression levels.
- Hes1, a key determinant of lineage commitment, showed high cell-to-cell variability and ~32% DNA-bound fraction.
- Hnf4g, conferring enterocyte identity, exhibited more uniform dynamics and a ~56% DNA-bound fraction.
Conclusions:
- Transcription factor diffusive behavior can serve as an indicator of differentiation progression within a lineage.
- Distinct TF dynamics may modulate early versus late stages of differentiation, influencing cell fate decisions.
- The developed SMT pipeline offers a broadly applicable method for studying TF dynamics in various 2D culture systems.
