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Ribosomal highly basic 23-kDa protein as a reliable standard for gene expression analysis
R Jesnowski1, C Backhaus, J Ringel
1Department of Medicine II, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany. ralf.jesenofsky@med.ma.uni-heidelberg.de
Background/Aims:
Analysis of gene expression is dependent on normalization using housekeeping genes. However, many of these housekeeping genes (e.g. GAPDH, beta-actin) are upregulated in chronic pancreatitis and pancreatic cancer, and cannot be used for normalization. For this reason we tried to identify a housekeeping gene useful for expression analysis in pancreatic diseases.
Methods:
RNA isolated from various tissues and states of disease was subjected to reverse transcription and subsequently amplified by PCR using primers for GAPDH and for the ribosomal highly basic 23-kDa (rb 23-kDa, RPL13A) protein.
Results:
As anticipated, expression of GAPDH varied markedly in the different tissues, whereas the expression of rb 23-kDa was constant in all samples investigated.
Conclusion:
We recommend the use of the ribosomal highly basic 23-kDa protein as a standard for normalization at least for the pancreas and the prostate.