Effect of creatine supplementation on housekeeping genes in human skeletal muscle using real-time RT-PCR

Murphy, Robyn, Watt, Kenneth, Cameron-Smith, David, Gibbons, Carl and Snow, Rodney 2003, Effect of creatine supplementation on housekeeping genes in human skeletal muscle using real-time RT-PCR, Physiological genomics, vol. 12, no. 2, pp. 163-174.

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Title Effect of creatine supplementation on housekeeping genes in human skeletal muscle using real-time RT-PCR
Author(s) Murphy, Robyn
Watt, Kenneth
Cameron-Smith, David
Gibbons, Carl
Snow, Rodney
Journal name Physiological genomics
Volume number 12
Issue number 2
Start page 163
End page 174
Publisher American Physiological Society
Place of publication Bethesda, Md.
Publication date 2003-01
ISSN 1094-8341
1531-2267
Keyword(s) gene expression
quantitative RT-PCR
endogenous controls
biological variability
PCR efficiency
Summary The present study examined the validity and reliability of measuring the expression of various genes in human skeletal muscle using quantitative real-time RT-PCR on a GeneAmp 5700 sequence detection system with SYBR Green 1 chemistry. In addition, the validity of using some of these genes as endogenous controls (i.e., housekeeping genes) when human skeletal muscle was exposed to elevated total creatine levels and exercise was also examined. For all except 28S, linear relationships between the logarithm of the starting RNA concentrations and the cycle threshold (CT) values were established for ß-actin, ß2-microglobulin (ß2M), cyclophilin (CYC), and glyceraldehyde-3-phosphate dehydrogenase (GAPDH). We found a linear response between CT values and the logarithm of a given amount of starting cDNA for all the genes tested. The overall intra-assay coefficient of variance for these genes was 1.3% and 21% for raw CT values and the linear value of 2-CT, respectively. Interassay variability was 2.3% for raw CT values and 34% for the linear value of 2-CT. We also examined the expression of various housekeeping genes in human skeletal muscle at days 0, 1, and 5 following oral supplementation with either creatine or a placebo employing a double-blind crossover study design. Treatments were separated by a 5-wk washout period. Immediately following each muscle sampling, subjects performed two 30-s all-out bouts on a cycle ergometer. Creatine supplementation increased (P < 0.05) muscle total creatine content above placebo levels; however, there were no changes (P > 0.05) in CT values across the supplementation periods for any of the genes. Nevertheless, 95% confidence intervals showed that GAPDH was variable, whereas ß-actin, ß2M, and CYC were the least varying genes. Normalization of the data to these housekeeping genes revealed variable behavior for ß2M with more stable expressions for both ß-actin and CYC. We conclude that, using real-time RT-PCR, ß-actin or CYC may be used as housekeeping genes to study gene expression in human muscle in experiments employing short-term creatine supplementation combined with high-intensity exercise.
Language eng
Field of Research 060405 Gene Expression (incl Microarray and other genome-wide approaches)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, American Physiological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002253

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