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A Practical Approach to Genetic Inducible Fate Mapping: A Visual Guide to Mark and Track Cells In Vivo

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Tamoxifen dose response and conditional cell marking: is there control?

Debra Ellisor¹, Mark Zervas

¹Department of Molecular Biology, Cell Biology and Biochemistry, Division of Biology and Medicine, Brown University, Providence, RI 02903, USA.

Molecular and Cellular Neurosciences

|July 6, 2010

Summary

Tamoxifen dose does not linearly correlate with recombination efficiency in CreER(T)-based gene marking. This study provides a quantitative framework for designing experiments using tamoxifen and CreER(T) systems.

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Area of Science:

Developmental Biology
Molecular Biology
Genetics

Background:

Conditional gene marking and inactivation are crucial for understanding biological mechanisms.
CreER(T) systems enable temporal control of genetic modifications following tamoxifen administration.
Accurate tamoxifen dosing is essential for reproducible experimental outcomes.

Purpose of the Study:

To investigate the relationship between tamoxifen dose and recombination efficiency in vivo.
To establish a quantitative framework for CreER(T)-based experimental design.

Main Methods:

Utilized Wnt1-CreER(T) to mark trigeminal ganglia progenitors in mouse embryos.
Administered a range of tamoxifen doses (50–500 mg/kg) to assess dose-dependent recombination.
Performed quantitative cell counting and statistical analyses on marked neuronal populations.

Main Results:

Observed significant variability in recombination efficiency within and between tamoxifen dose groups.
Found no clear linear correlation between tamoxifen dose and the number of recombined cells.
This study presents novel quantitative data on tamoxifen dose-response in vivo.

Conclusions:

Tamoxifen dose is not a reliable predictor of recombination efficiency in Wnt1-CreER(T) systems.
Experimental designs utilizing tamoxifen and CreER(T) require careful consideration of dosing paradigms.
The findings offer a statistical framework to guide future conditional gene manipulation studies.