Background: Transcriptomic profiling of ex vivo cultured human limbal epithelial stem cells (hLESCs) will foster
better understanding of corneal physiology and novel treatment paradigms to limbal stem cell deficiency (LSCD).
However, currently such profiling studies are hampered due to difficulties with producing sufficient amounts
of intact mRNA for deep RNA sequencing (RNA-seq) from subpopulations sorted on the basis of co-expression
of membrane and intracellular antigens by fluorescence-activated cell sorting (FACS).
Methods: To address this problem, we systematically analyzed the critical steps, and found that ethanol
fixation together with optimized downstream procedures provided a pipeline that yielded high quality total
RNA in amounts to readily support the RNA-seq procedure, while still preserving good discrimination between
the individual hLESC immunophenotypes.
Results: The average RNA integrity number (RIN) was 7.7 ± 0.4, and the average yield was 4.6 ± 1.7 pg of RNA
per cell. The sequencing analysis of the isolated RNA produced high quality data with more than 70% of read
pairs mapping uniformly to the reference genome and 80% of bases with a Phred score of at least 30.
Conclusion: In this study, we developed a reliable FACS-based procedure using ethanol as a fixative that would
support accurate isolation of limbal epithelial progenitor subpopulations along with RNA yield and quality sufficient to
enable deep transcriptomic profiling.

• Biological Procedures Online