Dataset features


Application: Gene expression microarray analysis
Number of samples: 4
Release date: Jun 1 2013
Last update date: Aug 31 2013
Access: Public
Taxon: Oncorhynchus mykiss
Dataset link Toxic effects of dietary methylmercury (MeHg) on juvenile rainbow trout

Experimental Protocol

Juvenile rainbow trout (Oncorhynchus mykiss, average body 0.118g) were fed Biodiet Starter (Bio-Oregon) 4% of body weight per day with MeHg added at 0ppm, 0.5ppm, 5ppm and 50ppm (with ethanol as vehicle). Trout at six weeks were sampled from each group for gene expression analysis. Total RNA from individual fish was isolated using Trizol reagent (Invitrogen) and further purified using the RNeasy MiniElute cleanup kit (Qiagen).RNA of ten fish from control group was pooled as a common reference, and total RNA of five individual fish from control and MeHg-treated groups were randomly selected for microarray experiment. cDNA was synthesized from 1 μg pooled RNA using SuperScript II Reverse Transcriptase (Invitrogen) according to the manufacturer’s protocol. The common reference cDNA targets were labeled with Cy3 and cDNA of individual fish from each group was labeled with Cy5 using the Array 900 Expression Array Detection kit (Genisphere) according to the manufacturer’s protocol. The labeled cDNA targets were hybridized to cGRASP 16K cDNA microarrays at 50°C for 16 hours. Following the first hybridization, arrays were washed in 2X SSC, 0.2% SDS solution at 50 C 1 x 15 min, 2X SSC 1 x 15 min at room temperature, then 0.2X SSC for 1 x 15 min at room temperature. The fluorescent labeling hybridization (50 C for 4hr) utilized the Genisphere 3DNA Cy3 and Cy5 capture reagents in formamide hybridization buffer. The slides were washed as described above, and the arrays were dried by centrifugation. were scanned using the ScanArray Express (PerkinElmer) at 10 um resolution. The TIFF images of arrays were generated with ScanArray Express software and the intensities of raw data of two-channel arrays were collected by the ImaGene 6.0 (BioDiscovery). Statistical analysis of microarray data was performed using scripts written in R language with LIMMA package.










Qing Liu