Quantification of cyclin A1 and glyceraldehyde-3-phosphate dehydrogenase expression in testicular biopsies of infertile patients by fluorescence real-time RT-PCR |
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Authors: | Schrader Mark Ravnik Stuart Müller-Tidow Carsten Müller Markus Straub Bernd Diedrichs Sven Serve Hubert Miller Kurt |
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Affiliation: | Department of Urology, Universit?tsklinikum Benjamin Franklin, Freie Universit?t Berlin, Berlin, Germany. schrader@medizin.fu-berlin.de |
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Abstract: | The objective of this study was to establish a classification of meiotic disorders by detection of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and cyclin A1 mRNA in patients presenting with non-obstructive azoospermia. GAPDH and cyclin A1 expression levels were detected in 37 histologically classified testicular tissue specimens by one-line RT-PCR. Levels of cyclin A1 expression (NCyclinA1) were high in tissue specimens with full spermatogenesis [3.519 +/- 3.141 (mean +/- SD)] but only minimal in those without haploid germ cells. A lack of cyclin A1 expression was seen in most sertoli-cell-only syndrome (SCOS) specimens. The criteria for an ideal internal standard were only partially met by GAPDH, as we detected decreased expression in tissue samples with maturation arrest [(268.2 +/- 106.2 relative gene expression (mean +/- SD)] and SCOS (201.7 +/- 95.2) compared to those with normal histological findings (325.1 +/- 129.3). It was concluded that the level of cyclin A1 mRNA expression predicts meiotic disorders during spermatogenesis. GAPDH is not an ideal internal standard for specific gene expression in testicular tissue specimens. |
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Keywords: | cyclin A1 cyclin-dependent kinase male fertility spermatogenesis |
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