Variable expression of some "housekeeping" genes during human keratinocyte differentiation

Brandi K. Steele, Craig Meyers, Michelle A. Ozbun

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


We investigated the expression levels of four cellular "housekeeping" genes during epithelial differentiation. Differentiation is a dynamic process and various cellular RNAs have been targeted for use as internal controls during differentiation of human keratinocytes, but the consistent expression of such standards has not been previously validated. We used the organotypic (raft) culture system to grow stratified and differentiated epithelium in vitro. We compared cellular RNAs from epithelial tissues of both normal human keratinocytes and keratinocytes whose differentiation scheme is altered by the replication of human papillomavirus. Using ribonuclease protection assays to quantify RNA expression levels, we found that β-actin and glyceraldehyde-3-phosphate dehydrogenase levels fluctuated during epithelial differentiation, whereas cyclophilin RNA and 28S-ribosomal RNA were the most consistently expressed during epithelial differentiation. These stably expressed cellular RNAs can be targeted as controls to permit quantitative expression analyses of cellular and pathogen RNAs during epithelial differentiation under various experimental conditions.

Original languageEnglish (US)
Pages (from-to)341-347
Number of pages7
JournalAnalytical Biochemistry
Issue number2
StatePublished - Aug 15 2002

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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