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Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract
Published on: November 28, 2012
Reference genes for quantitative real time PCR in UVB irradiated keratinocytes
Attila Balogh1, György Paragh, Attila Juhász
1Department of Dermatology, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary Nagyerdei Körut 98, H-4032 Debrecen, Hungary.
Journal of Photochemistry and Photobiology. B, Biology
|September 16, 2008
Summary
Selecting stable reference genes like SDHA and PGK1 is crucial for accurate mRNA analysis in keratinocytes following UVB exposure. Proper gene selection ensures reliable results in gene expression studies.
Area of Science:
- Molecular Biology
- Biotechnology
- Dermatology
Background:
- Real-time quantitative reverse transcription-polymerase chain reaction (qRT-PCR) is vital for measuring mRNA levels.
- Identifying stable reference genes is essential for accurate gene expression comparisons.
- Ultraviolet B (UVB) radiation's effects on keratinocytes are widely studied using qRT-PCR, but optimal reference gene selection remains unclear.
Purpose of the Study:
- To identify the most stable reference genes for normalizing qRT-PCR data in neonatal human epidermal keratinocytes (NHEK) after UVB irradiation.
- To evaluate the impact of reference gene selection on the observed gene expression changes, particularly for TNF-alpha and VEGF.
- To provide evidence-based recommendations for reliable reference gene usage in UVB-treated keratinocyte studies.
Main Methods:
- Analyzed mRNA expression of 10 candidate housekeeping genes in NHEK post-UVB treatment (20-40mJ/cm(2)).
- Assessed reference gene stability using GeNorm and Normfinder software.
- Validated UVB biological effects using trypan blue exclusion, MTT, and comet assays.
- Examined the influence of reference gene choice on TNF-alpha and VEGF expression analysis.
Main Results:
- Succinate dehydrogenase complex subunit A (SDHA) was identified as the best individual reference gene.
- The combination of SDHA and phosphoglycerate kinase-1 (PGK1) was found to be the most suitable reference gene pair.
- While TNF-alpha expression changes were largely independent of reference gene selection, VEGF expression analysis was significantly affected by it.
- UVB dose of 20-40mJ/cm(2) was validated as biologically effective.
Conclusions:
- Reference gene selection critically impacts the interpretation of gene expression data in UVB-treated keratinocytes.
- SDHA alone or in combination with PGK1 offers a reliable method for normalizing qRT-PCR results in this experimental system.
- These findings underscore the importance of rigorous reference gene validation for accurate qRT-PCR analysis in skin biology research.
