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Transcriptome analyses using the Chen Lab Cotton 25k oligo microarray

ABSTRACT: The chip of cotton oligonucleotide microarrrays, which contain ~23,000 UniGenes from our own ESTs sequence project (Gossypium hirsutum L. TM-1 immature ovules (GH_TMO) ) and open resources, was developed. Transcriptome analyses were performed to compare gene expression changes in laser capture microdissected (LCM) fiber cell initials (or epidermis) and inner ovules. The gene expression profiles of the fiber cell initials were compared with those of the inner ovules in each developmental stage prior to (-2DPA), right at (0DPA), and shortly after the initiation of fiber cells (2DAP and 7DPA). Many genes in various molecular functions or biological processes were over- or under-represented between fibers and non-fiber tissues in each developmental stage, suggesting temporal regulation of gene expression during early stages of fiber development.

ORGANISM(S): Gossypium hirsutum

PROVIDER: GSE27506 | GEO | 2011/05/06

SECONDARY ACCESSION(S): PRJNA138571

REPOSITORIES: GEO

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Transcriptome analyses using the Chen Lab Cotton 25k oligo microarray

Project description:The chip of cotton oligonucleotide microarrrays, which contain ~23,000 UniGenes from our own ESTs sequence project (Gossypium hirsutum L. TM-1 immature ovules (GH_TMO) ) and open resources, was developed. Transcriptome analyses were performed to compare gene expression changes in laser capture microdissected (LCM) fiber cell initials (or epidermis) and inner ovules. The gene expression profiles of the fiber cell initials were compared with those of the inner ovules in each developmental stage prior to (-2DPA), right at (0DPA), and shortly after the initiation of fiber cells (2DAP and 7DPA). Many genes in various molecular functions or biological processes were over- or under-represented between fibers and non-fiber tissues in each developmental stage, suggesting temporal regulation of gene expression during early stages of fiber development. For gene expression studies using a large set cotton oligo-microarray, 4 developmental stages were chosen. To study differential expression during fiber initiation, ovules at -2 DPA, 0 DPA, and 2 DPA were used. One of the fiber elongation stage tissues (7 DPA) was included. In each developmental stage, epidermis was separated from inner ovules and subjected to the hybridization. In addition, epidermis and ovule comparisons were performed individually with 0 DPA as a control point for comparison.

2011-05-06 | E-GEOD-27506 | biostudies-arrayexpress

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Project description:Cotton is one of the most commercially important Fiber crops in the world and used as a source for natural textile Fiber and cottonseed oil. The fuzzless-lintless ovules of cotton mutants are ideal source for identifying genes involved in Fiber development by comparing with Fiber bearing ovules of wild-type. To decipher molecular mechanisms involved in Fiber cell development, transcriptome analysis has been carried out by comparing G. hirsutum cv. MCU5 (wild-type) with its fuzzless-lintless mutant (MUT). Cotton bolls were collected at Fiber initiation (0 dpa/days post anthesis), elongation (5, 10 and 15 dpa) and secondary cell wall synthesis stage (20 dpa) and gene expression profiles were analyzed in wild-type and MUT using Affymetrix cotton GeneChip Genome array.

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Project description:Purpose: The goal of this experiment was to use RNA-seq to compare the two commercial cotton species Gossypium hirsutum and Gossypium barbadense and determine what transcripts may account for the better fiber quality in the latter. Methods: RNA was extracted from Gossypium barbadense or Gossypium hirsutum fibers at 10, 15, 18, 21, and 28 days post anthesis. Paired-end, 100-bp RNA-seq was performed on an Illumina HiSeq2000 and the reads were mapped to the Gossypium raimondii genome at www.phytozome.net and non-homologous contig assemblies from Gossypium arboreum. Results from RNA-seq were combined with non-targeted metabolomics. Results: Approximately 38,000 transcripts were expressed (RPKM>2) in each fiber type and approximately 2,000 of these transcripts were differentially expressed in a cross-species comparison at each timepoint. Enriched Gene Ontology biological processes in differentially expressed transcripts suggested that Gh fibers were more stressed. Conclusions: Both metabolomic and transcriptomic data suggest that better mechanisms for managing reactive oxygen species contribute to the increased fiber length in Gossypium barbadense. This appears to result from enhanced ascorbate biosynthesis via gulono-1,4-lactone oxidase and ascorbate recycling via dehydroascorbate reductase. See Bioproject PRJNA263926 and SRA accession SRP049330 for study design and raw sequencing data and Bioproject PRJNA269608 and TSA accession GBYK00000000 for Gossypium arboreum assembled contig sequences used for transcriptome mapping - Cotton fiber mRNA from 10,15,18,21 and 28 day post anthesis fiber from either Gossypium hirusutm or Gossypium barbadense was sequenced and differential gene expression analysis was conducted between species for each timepoint and between adjacent timepoints. Each timepoint was representative of fiber from 9 individual plants processed as 3 biological replicate pools (material from 3 individual plants per pool).

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Transcriptomics and Metabolomics of 10 - 28 day post anthesis cotton fiber from Gossypium hirsutum and Gossypium barbadense

2015-06-26 | GSE64958 | GEO

Small RNA sequencing identifies miRNA roles in ovule and fiber development

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