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Histone H3 lysine 27 trimethylation (H3K27me3) modulates the fiber initiation in upland cotton

ABSTRACT: Histone methylation is one of the most significant epigenetic modifications in plants because it is responsible for regulating and controlling the expression of many important functional genes. Although there have been many studies concerning histone methylation, its specific functions and mechanisms in cotton fiber initiation remain unclear. To determine if the H3K27me3 modification had regulated cotton fiber initiation in upland cotton (Gossypium hirsutum), we performed a comparative analysis on the cleavage under targets and tagmentation (CUT&Tag) between the wild-type cultivar Xu142 and its fibreless mutant Xu142 fl. This research was carried out three time points during the initiation period of cotton fibers, which were -1, 0 and 1 days post-anthesis (DPA). We also used the H3K27me3 antibody in Xu142 and Xu142 fl to examine the differential deposition of H3K27me3. Combing these results with RNA-seq analysis, we discovered a negative correlation between transcription and H3K27me3. We identified 336 genes with opposing trends in H3K27me3 deposition and expression. These genes are involved in various metabolic pathways, including fatty acid biosynthesis, galactose metabolism, plant hormone signal transduction, plant-pathogen interaction, glycolysis-/-gluconeogenesis, phenylpropanoid biosynthesis, and cutin, suberin and wax biosynthesis. Further physiological research revealed that in vitro ovule culture with an RDS 3434 inhibitor could alters the level of H3K27me3 in ovules, thus influencing the process of cotton fiber development. Taken together, these results indicate that H3K27me3 plays an important role in the fiber initiation process of cotton, and demonstrates the H3K27me3 network involved in fiber initiation in cotton ovules. The study also provides a foundation for the future study of genes involved in fiber development.

ORGANISM(S): Gossypium hirsutum

PROVIDER: GSE227870 | GEO | 2024/03/14

REPOSITORIES: GEO

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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. Cotton plants were grown under field condition. Flowers were tagged and cotton bolls were collected during Fiber development stages. Total RNA was isolated from Fiber bearing ovules of wild-type (WT) and fuzzless-lintless ovules of mutant (MUT) collected at various (0, 5, 10, 15 and 20 dpa) Fiber development stages using SpectrumTM Plant Total RNA kit (Sigma, USA) according to the manufacturerM-bM-^@M-^Ys protocol. Affymetrix cotton GeneChip Genome array (Affymetrix, USA) having 23,977 probe sets representing 21,854 cotton transcripts was used for transcriptome analysis. Three biological replicates were maintained to test the reproducibility and quality of the chip hybridization. cDNA labeling, array hybridization, staining and washing procedures were carried out as described in the Affymetrix protocols. CEL files having estimated probe intensity values were analyzed with GeneSpring GX-11.5 software (Agilent Technologies, USA) to get differentially expressed transcripts. The Robust Multiarray Average (RMA) algorithm was used for the back ground correction, quantile normalization and median polished probe set summarization to generate single expression value for each probe set. Normalized expression values were log2-transformed and differential expression analysis was performed using unpaired t-test. The p-values were corrected by applying the false discovery rate (FDR) correction (Benjamini and Hochberg, 2000).

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Histone H3 lysine 27 trimethylation (H3K27me3) modulates the fiber initiation in upland cotton

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