Name:gamma rays - environmental treatment - gamma rays,gamma rays:. 1OO grays with a 60 cobalt source at a dose rate of 22 gray/min for 2 hours
Growth protocol
whole plant - In vitro culture in Petri dishes in 30 ml medium containing macroelements according to Estelle M.A. Somerville C. 1987. Auxin-resistant mutants of Arabidopsis thaliana with an altered morphology. MGG, 206, 200-206, microelements according to Santoni V., Bellini C., Caboche M. 1994 Planta, 192, 557-566. Use of two-dimensional protein-pattern analysis for the characterization of Arabidopsis mutants, 1% glucose (Prolabo Normapur) pH5.5 solidified by 4 g/L of phytagel (Sigma). Seeds were surface sterilized and sown , then incubated 2 days at 4degreeC and transferred at 22degreeC 14 h light-18degreeC 10 h for 4 days.
Extracted molecule
total RNA
Extraction protocol
SIr1.5h:89ug.
Label
Cy5
Label protocol
labelling Cy3 and Cy5 indirect, amplification=yes, DNA 5 ug. Labelling protocol: 5 µg of aRNA (8µl) mixed with 2 µl of random nonamers 1µg/µl and 0.5 µl of RNAse Out 40 U/µl, denatured 10 min at 70 °C and chilled on ice. The followig components were added to the sample 4 µl of first strand buffer 5 X, 1 µl of 10 mM dNTP/2mM dCTP, 2 µl of 0.1 M DTT, 1.5 µl of Cy3-dCTP or Cy5-dCTP (Amersham Pharmacia Biotech, 25nmol tube, PA5502), 1 µl of SuperScript II RT 200U/µl. Then it was incubated at 42°C for 2.5 hours and chilled on ice. The sample was denaturated by adding 2 µl of NaOH 2.5M and incubated at 37 °C for exactly 15 min, then was added 10 µl of 2M MOPS and put on ice. The dyes were purified with the QIAquick PCR Purification Kit (QIAGEN).
Name:gamma rays - environmental treatment - gamma rays,gamma rays:. 1OO grays with a 60 cobalt source at a dose rate of 22 gray/min for 2 hours
Growth protocol
whole plant - In vitro culture in Petri dishes in 30 ml medium containing macroelements according to Estelle M.A. Somerville C. 1987. Auxin-resistant mutants of Arabidopsis thaliana with an altered morphology. MGG, 206, 200-206, microelements according to Santoni V., Bellini C., Caboche M. 1994 Planta, 192, 557-566. Use of two-dimensional protein-pattern analysis for the characterization of Arabidopsis mutants, 1% glucose (Prolabo Normapur) pH5.5 solidified by 4 g/L of phytagel (Sigma). Seeds were surface sterilized and sown , then incubated 2 days at 4degreeC and transferred at 22degreeC 14 h light-18degreeC 10 h for 4 days.
Extracted molecule
total RNA
Extraction protocol
S1.5h:26ug.
Label
Cy3
Label protocol
labelling Cy3 and Cy5 indirect, amplification=yes, DNA 5 ug. Labelling protocol: 5 µg of aRNA (8µl) mixed with 2 µl of random nonamers 1µg/µl and 0.5 µl of RNAse Out 40 U/µl, denatured 10 min at 70 °C and chilled on ice. The followig components were added to the sample 4 µl of first strand buffer 5 X, 1 µl of 10 mM dNTP/2mM dCTP, 2 µl of 0.1 M DTT, 1.5 µl of Cy3-dCTP or Cy5-dCTP (Amersham Pharmacia Biotech, 25nmol tube, PA5502), 1 µl of SuperScript II RT 200U/µl. Then it was incubated at 42°C for 2.5 hours and chilled on ice. The sample was denaturated by adding 2 µl of NaOH 2.5M and incubated at 37 °C for exactly 15 min, then was added 10 µl of 2M MOPS and put on ice. The dyes were purified with the QIAquick PCR Purification Kit (QIAGEN).
Hybridization protocol
SIr1.5h Cy5 / S1.5h Cy3 : 30pmol. Hybridization Protocol: CATMA slides (Corning Microarray Technology, CORNING) are pretreated in the prehybridisation solution (1 % BSA, 0.1 SDS, 5X SSC ) at 42°C for 60 min. They are dipped a couple of times in distilled water at room temperature, then in isopropanol and dried immediately by compressed nitrogen stream. Slides were placed in Corning hybridization chambers with a 25x60 lifterslip and 10ul of distilled water for each groove. The target was diluted to a final volume of 60 µL as follows 15µl of purified, labeled cDNA, 15 µl of 4X Hybridization Buffer ( 20X SDS, 0.4 % SDS), 30 µL formamide. The target mixture is heated for 3 min at 95°C, put on ice for 30 sec and centrifuged to remove dust for 1 min. The target mixture was put on the chip as quickly as possible. The microarray is sealed in a chamber and submerged in a 42°C water bath for approximately 16 h. The microarray is washed for 4 min in 1xSSC, 0.2% SDS (42°C); 4 min in 0.1x SSC, 0.2% SDS (RT); 4 min in 0.1x SSC, 0.2% SDS (RT); 4 min in 0.1x SSC (RT); dipped a few times in distilled water and dried immediately by compressed nitrogen stream.
Scan protocol
GenePix Pro 3.0, Cy3:pmt voltage 532nm,650V,laser power 100%, Cy5:635nm,pmt voltage 650V,laser power 100%
Description
which Arabidopsis thaliana genes are induced by ionising radiations? Comparison of SADE transcriptome data (Af1999083) and micro-arrays transcriptome data.
Data processing
The raw data comprised the logarithm of median feature pixel intensity at wavelength 635 nm (red) and 532 nm (green). No background was subtracted. An array-by-array normalization was performed to remove systematic biases. First, we excluded spots that were considered badly formed features by the experimenter (Flags=-100). Then we performed a global intensity-dependent normalization using the loess procedure (see Yang et al., 2002) to correct the dye bias. Finally, on each block, the log-ratio median is subtracted from each value of the log-ratio of the block to correct a print-tip effect on each metablock.
