Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of Arabidopis nai1-1, ER body deficient mutant, vs wild-type Col-0

ABSTRACT: ER bodies are endoplasmic reticulum (ER)-derived organelles that might be involved in defense systems. The NAI1 gene regulates the development of ER bodies because mutation of NAI1 abolishes the formation of ER bodies. The nai1-1 mutant had a single nucleotide change at an intron acceptor site of At2g22770 (NAI1 gene). Because of this mutation, aberrant splicing of NAI1 mRNA occurs in the nai1-1 mutant. NAI1 encodes a transcription factor that has a basic-helix-loop-helix (bHLH) domain. Transient expression of NAI1 induced ER bodies in the nai1-1 mutant. To identify genes that are related to ER bodies, we compared the genome-wide expression profiles of Col-0 and the nai1-1 mutant using DNA microarrays. Twenty-nine genes were found to be expressed at least 2-fold more strongly in the nai1-1 mutant than in Col-0, and 341 genes were found to be expressed at least 2-fold more strongly in Col-0 than in the nai1-1 mutant. The 15 genes that showed the strongest expression in Col-0 compared to the expression in nai1-1 are shown in Table 1. Five of these genes are JAL genes (JAL22, JAL23, JAL31, JAL33 and PBP1/JAL30). The mRNA level of PYK10 was reduced in nai1-1 (4.3 fold larger in Col-0 than in nai1-1). The mRNA levels of GLL genes (GLL23 and GLL25) were also reduced in nai1-1. Experiment Overall Design: Total RNA was purified from the roots of 20-day-old plants (3 plants were pooled for each genotype). Arabidopsis plants were grown under continuous light condition at 22ËC on MS medium paltes. The control plants and the nai1-1 mutant were cultivated in the same plate. This was done to avoid any difference in plant growth conditions between the mutants and the control plants.

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Ikuko Hara-Nishimura

PROVIDER: E-GEOD-6446 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:RNA from the aerial parts of 15-day-old eceriferum cer6-2 mutant and control plants were used in microarray experiments to screen for differentially expressed genes. Among those which were down regulated in the mutant, several were known to be involved in various plant defense mechanisms. The most remarkable difference was measured for the transcripts encoding the pathogenesis-related protein1 (PR-1), which is a marker of the systemic acquired resistance (SAR) pathway, with a 100-fold decrease in the cer6-2 mutant. Further Q-PCR experiments showed that the PR-1 transcript levels were low in two other eceriferum mutants, representing 1/200th and 1/25th of the normal values in the aerial part of 15-day-old cer2 and cer1-1 mutants, respectively. Interestingly, PR-1 mRNA levels were closed to the normal values in the cer3-1 and cer6-2R mutant, the latter being a plant where the synthesis of the very-long chain fatty acids, which is deficient in the cer6-2 plants, is partially restored. Altogether, these results strongly suggested that the amount of PR1-mRNA was not directly correlated to the amount of epicuticular wax on the leaves, but was rather correlated to the presence or absence of some particular lipid-constituents in the epicuticular wax layer. Related publication:; Garbay B, Tautu MT, Costaglioli P. Low level of pathogenesis-related protein 1 mRNA expression in 15-day-old Arabidopsis cer6-2 and cer2 eceriferum mutants. Plant Science 2007; Volume 172, Issue 2, Pages 299-305 Experiment Overall Design: Total RNA was purified from the aerial parts of 2-week-old plants (20 plants were pooled for each genotype). Arabidopsis plants were grown under long-day conditions (16 h light:8 h dark) at 22Â°C and 80% relative humidity. The control plants and the cer mutant were cultivated in the same phytotron, and the Petri dishes were placed randomly on the same shelf. This was done to avoid any difference in plant growth conditions between the mutants and the control plants. The microarrays used were Agilent Arabidopsis2. GSM87735 represents the direct experiment (cer6-2 Cy3, Ler-0 Cy5), and GSM88340 represents the dye-swap (Ler-0 Cy3, cer6-2 Cy5)

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Transcription profiling of Arabidopis nai1-1, ER body deficient mutant, vs wild-type Col-0

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