Stock Code: N3176 Developmental stage: 5.10 Tissue: total roots (primary and all lateral )
Treatment protocol
Inoculated with pre-germinated Gigaspora rosea spores
Extracted molecule
total RNA
Extraction protocol
none supplied
Label
biotin
Label protocol
RNA samples were quality controlled using the Agilent 2100 Bioanalyzer. 100 pmol T7-(dT)24 primer (5'-GGCCAGTGAATTGTAATACGACTCACTATAGGGAGGCGG-(dT)24-3') was hybridized with the Total RNA ( 8 - 12ug) at 70oC for 10 minutes. First strand cDNA was synthesized by reverse transcription using 400 units SuperScript II Reverse Transcriptase in a reaction containing 50 mM Tris-HCl (pH 8.3), 75 mM KCl, 3 mM MgCl2, 10 mM dithiothreitol (DTT) and 0.5 mM dNTPs at 42C for 1 hour. The reaction was then put on ice for 2 mins, followed by second strand cDNA synthesis. 130ul of the second strand reaction mix was added to the 20ul first strand synthesis reaction. The second strand reaction mix contained 40 units E. coli DNA polymerase I, 10 units E. coli DNA ligase, 2 units E. coli RNase H and 0.2 mM dNTPs in a buffer containing 20 mMTris-HCl (pH 6.9), 90 mM KCl, 4.6 mM MgCl2, 10mM (NH4)SO4 and 0.15 mM beta-NAD+. The reaction was incubated at 16 C for 2 hours. 10 units T4 DNA Polymerase was added and the reaction incubated for a further 5 minutes at 16 C, then the reaction was terminated using EDTA. The double-stranded cDNA was cleaned up using the cDNA Cleanup Spin Column supplied in the Affymetrix GeneChip Sample Cleanup Module. The double-stranded cDNA was used as a template for in Vitro transcription of biotin-labeled cRNA using the ENZO BioArray RNA Transcript Labeling Kit supplied by Affymetrix. The Transcript Labeling kit produces large amounts of hybridizable biotin-labeled RNA targets by in Vitro transcription from bacteriophage T7 RNA polymerase promoters. The reaction mixture containing Biotin-Labeled ribonucleotides (ATP, GTP, CTP, UTP with Bio-UTP and Bio-CTP), DTT, RNase inhibitor mix and T7 RNA polymerase was incubated at 37 C for 5 hrs, gently mixing every 30 minutes during the incubation. This produced an average of 40ug biotin-labeled cRNA . The biotin-labeled cRNA was cleaned up using the cRNA Cleanup Spin Column supplied in the Affymetrix GeneChip Sample Cleanup Module. The quantity and quality of the cRNA was measured using the Agilent 2100 Bioanalyzer. The total amount of cRNA was calculated, the starting quantity of RNA subtracted to give the quantity of adjusted cRNA. The cRNA was fragmented by metal-induced hydrolysis to break down full-length cRNA to 35-200 base fragments. 15ug of adjusted cRNA was used to prepare 300ul of hybridization cocktail of which 200ul was hybridized with the GeneChip.
Hybridization protocol
Biotin Labelled cRNA using Affymetrix Enzo Kit according to guidelines set out by Affymetrix, Santa Clara, CA.
Scan protocol
Scanned according to guidelines set out by Affymetrix, Santa Clara, CA.
