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Background  Tibetans have lived at high altitudes for thousands of years, and they have unique physiological traits that enable them to tolerate this hypoxic environment. However, the genetic basis of these traits is still unknown. As a sensitive and highly efficient technique, RT-qPCR is widely used in gene expression analyses to provide insight into the molecular mechanisms underlying environmental changes. However, the quantitative analysis of gene expression in blood is limited by a shortage of stable reference genes for the normalization of mRNA levels. Thus, systematic approaches were used to identify potential reference genes.    Results  The expression levels of eight candidate human reference genes ( GAPDH ,  ACTB ,  18S RNA ,   β 2-MG ,  PPIA ,  RPL13A ,  TBP  and  SDHA ) were assessed in blood from hypoxic environments. The expression stability of these selected reference genes was evaluated using the geNorm, NormFinder and BestKeeper programs. Interestingly,  RPL13A  was identified as the ideal reference gene for normalizing target gene expression in human blood before and after exposure to high-altitude conditions.    Conclusion  These results indicate that different reference genes should be selected for the normalization of gene expression in blood from different environmental settings.

Identification of reference genes in blood before and after entering the plateau for SYBR green RT-qPCR studies