Unknown,Transcriptomics,Genomics,Proteomics

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Transcriptome profiling reveals regulatory and functional differentiation between maize mesophyll and bundle sheath cells

ABSTRACT: Maize, as a C4 plant, possesses two distinct types of photosynthetic cells, the mesophyll (M) and the bundle sheath (BS) cells. To elucidate their functional and regulatory differentiation we isolated large quantities of highly homogeneous M and BS cells from new mature leaves for transcriptome profiling by Illumina sequencing. More than 100,000,000 reads for each cell type were mapped to the maize genome, revealing 44,964 expressed genes. Among these, 37,105 genes were expressed in M cells, including 423 M-enriched genes and 20 M-enriched transcription factor (TF) genes, whereas 42,782 genes were expressed in BS cells, including 771 BS-enriched genes and 75 BS-enriched TF genes. Pathway analyses revealed cell differentiation in various cellular activities, with M cells playing more important roles in light reaction, protein synthesis, abiotic stress, tetrapyrrole synthesis and RNA-RNA binding, while BS cells specializing in transport, signaling, protein degradation, major C metabolism, and the Calvin cycle. Genes coding for enzymes and transporters involved in photosynthesis exhibit a strong cellular preference in expression. To a lesser extent, cell differentiation also occurs in genes involved in the metabolism of starch, sucrose, nitrogen, sulfur, amino acid, and secondary metabolites. This comprehensive dataset will be useful for studying the regulation and evolution of C4-specific and related genes.

INSTRUMENT(S): Illumina Genome Analyzer IIx

ORGANISM(S): Zea mays

SUBMITTER: Wen-Hsiung Li

PROVIDER: E-MTAB-4320 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Characterizing regulatory and functional differentiation between maize mesophyll and bundle sheath cells by transcriptomic analysis.

Chang Yao-Ming YM Liu Wen-Yu WY Shih Arthur Chun-Chieh AC Shen Meng-Ni MN Lu Chen-Hua CH Lu Mei-Yeh Jade MY Yang Hui-Wen HW Wang Tzi-Yuan TY Chen Sean C-C SC Chen Stella Maris SM Li Wen-Hsiung WH Li Wen-Hsiung WH Ku Maurice S B MS

Plant physiology 20120724 1

To study the regulatory and functional differentiation between the mesophyll (M) and bundle sheath (BS) cells of maize (Zea mays), we isolated large quantities of highly homogeneous M and BS cells from newly matured second leaves for transcriptome profiling by RNA sequencing. A total of 52,421 annotated genes with at least one read were found in the two transcriptomes. Defining a gene with more than one read per kilobase per million mapped reads as expressed, we identified 18,482 expressed genes ...[more]

PMID: 22829318

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Project description:During Zea mays (maize) C4 differentiation, mesophyll (M) and bundle sheath (BS) cells accumulate distinct sets of photosynthetic enzymes, with very low photosystem II (PSII) content in BS chloroplasts. Consequently, there is little linear electron transport in the BS and ATP is generated by cyclic electron flow. In contrast, M thylakoids are very similar to those of C3 plants and produce the ATP and NADPH that drive metabolic activities. Regulation of this differentiation process is poorly understood but involves expression and coordination of nuclear and plastid genomes. Here, we identify a recessive allele of the maize Hcf136 homologue that in Arabidopsis thaliana functions as a PSII stability or assembly factor located in the thylakoid lumen. Proteome analysis of the thylakoids and electron microscopy reveal that Zm hcf136 lacks PSII complexes and grana thylakoids in M chloroplasts, consistent with the previously defined Arabidopsis function. Interestingly, hcf136 is also defective in processing the full-length psbB-psbT-psbH-petB-petD polycistron specifically in M chloroplasts. To determine whether the loss of PSII in M cells affects C4 differentiation, we performed cell-type specific transcript analysis of hcf136 and wild-type seedlings. The results indicate that M and BS cells respond uniquely to the loss of PSII, with little overlap in gene expression changes between data sets. These results are discussed in the context of signals that may drive differential gene expression in C4 photosynthesis. To explore the disruption of PSII activity on gene expression, transcript profiles from separated M and BS cells were examined using two-label microarray analysis. Total RNA was isolated from the second leaves of mutant and wild-type silbings. Six biological replicates were used to compare wild-type and mutant transcript profiles in separate M and BS experiments. To maximize biological replication, different seedling pools were used for each of the 12 hybridizations. Microarray experiments and analyses were performed using the Genisphere MPX900 kit and the Maize Array Consortium oligonucleotide platform (GPL5439; GPL5440). Feature intensity values were log-transformed and corrected for local background signal, and a LOWESS procedure (Dudoit et al., 2002) was used to normalize between channels. Features with either low or saturating signal intensity were discarded from further analysis. High expression filtering was less stringent to avoid elimination of previously characterized, high abundance, C4 cell-specific transcripts. After filtering, features that were not assigned an MZ number by the Maize Array Consortium were discarded from further analysis. The moderated t-test (Smyth, 2004) using the R package limma was applied to identify differentially expressed genes. The p-values for each test (gene) were converted to q-values for false discovery rate analysis as described by Storey et al. (2004). To avoid confounding treatment effects associated with direct comparisons of M and BS transcriptomes (Sawers et al., 2007), comparisons were only made using the same cell type across the hcf136 and wild-type sibling genotypes. Bundle sheath (BS) Samples: GSM245063-GSM245164 Mesophyll (M) Samples: GSM245165 - GSM245206

Project description:A number of taxa utilize C4 photosynthesis, to limit the impact of photorespiration upon photosynthetic performance. In order to achieve a local elevation of CO2 concentration, maize plants possess two photosynthetic cell types. Rubisco accumulation is restricted to bundle sheath (BS) cells that surround the leaf veins. Carbon fixation occurs initially in adjacent mesophyll (ME) cells. C4 compounds are transported into the BS cells where they are subsequently decarboxylated, releasing CO2. Although the major components of the C4 pathway have been well characterized, less is known about further metabolic partitioning in the maize leaf. Microarray hybridizations have been performed in order to further investigate metabolic differences between BS and ME cell types. BS strands and ME protoplasts were isolated from the leaves of 10 day old maize seedlings by mechanical disruption and enzymatic digestion respectively. To control for differences arising from these different protocols, total leaf (TO) and total leaf stress (ST) samples were also isolated. The ST sample was subjected to the same treatments as the ME sample, with the omission of cell-wall degrading enzymes. Leaves for the TO sample were harvested as for the BS strand sample. An interwoven loop design was used to compare the four treatment groups. A biological group consisted of a growth of plants from which pooled individuals were taken for the four treatments. Six biological replicates (groups) were used. Labeling was performed using the Genisphere Array 900-MPX kit according to the manufacturer's protocol. Post hybridization washes were performed according to the recommendations of the Maize Oligo Array Project. Scan settings were used for detection of moderate to high expression signals (gain ~ 60%. power 90%). Following hybridization with TO cDNA, ~1/3 of features provided signal above twice background and below saturation. A number of taxa utilize C4 photosynthesis, to limit the impact of photorespiration upon photosynthetic performance. In order to achieve a local elevation of CO2 concentration, maize plants possess two photosynthetic cell types. Rubisco accumulation is restricted to bundle sheath (BS) cells that surround the leaf veins. Carbon fixation occurs initially in adjacent mesophyll (ME) cells. C4 compounds are transported into the BS cells where they are subsequently decarboxylated, releasing CO2. Although the major components of the C4 pathway have been well characterized, less is known about further metabolic partitioning in the maize leaf. Microarray hybridizations have been performed in order to further investigate metabolic differences between BS and ME cell types. BS strands and ME protoplasts were isolated from the leaves of 10 day old maize seedlings by mechanical disruption and enzymatic digestion respectively. To control for differences arising from these different protocols, total leaf (TO) and total leaf stress (ST) samples were also isolated. The ST sample was subjected to the same treatments as the ME sample, with the omission of cell-wall degrading enzymes. Leaves for the TO sample were harvested as for the BS strand sample. An interwoven loop design was used to compare the four treatment groups. A biological group consisted of a growth of plants from which pooled individuals were taken for the four treatments. Six biological replicates (groups) were used. Labeling was performed using the Genisphere Array 900-MPX kit according to the manufacturer's protocol. Post hybridization washes were performed according to the recommendations of the Maize Oligo Array Project. Scan settings were used for detection of moderate to high expression signals (gain ~ 60%. power 90%). Following hybridization with TO cDNA, ~1/3 of features provided signal above twice background and below saturation. Keywords: Gene expression profiling of bundle sheath and mesophyll cell types

Dataset Information

Transcriptome profiling reveals regulatory and functional differentiation between maize mesophyll and bundle sheath cells

Publications

Characterizing regulatory and functional differentiation between maize mesophyll and bundle sheath cells by transcriptomic analysis.

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