Arabidopsis thaliana
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA700810 | ENA |
REPOSITORIES: ENA
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Project description:In eukaryotes, histone acetylation is a major modification on histone N-terminal tails that is tightly connected to transcriptional activation. HDA6 is a histone deacetylase involved in the transcriptional regulation of genes and transposable elements (TEs) in Arabidopsis thaliana. HDA6 has been shown to participate in several complexes in plants, including a conserved SIN3 complex. Here, we uncover a novel protein complex containing HDA6, several Harbinger transposon-derived proteins (HHP1, SANT1, SANT2, SANT3, and SANT4), and MBD domain-containing proteins (MBD1, MBD2, and MBD4). We show that mutations of all four SANT genes in the sant-null mutant cause increased expression of the flowering repressors FLC, MAF4, and MAF5, resulting in a late flowering phenotype. Transcriptome deep sequencing reveals that while the SANT proteins and HDA6 regulate the expression of largely overlapping sets of genes, TE silencing is unaffected in sant-null mutants. Our global histone H3 acetylation profiling shows that SANT proteins and HDA6 modulate gene expression through deacetylation. Collectively, our findings suggest that Harbinger transposon-derived SANT domain-containing proteins are required for histone deacetylation and flowering time control in plants.
2021-05-10 | GSE167288 | GEO
Project description:POWERDERESS and HDA9 interact and promote histone H3 deacetylation at specific lysine residues in Arabidopsis. [RNA-Seq]
| PRJNA353122 | ENA
Project description:POWERDERESS and HDA9 interact and promote histone H3 deacetylation at specific lysine residues in Arabidopsis. [ChIP-Seq]
| PRJNA353121 | ENA
Project description:Histone acetylation is a major epigenetic control mechanism that is tightly linked to the promotion of gene expression. Histone acetylation levels are balanced through the opposing activities of histone acetyltransferases (HATs) and histone deacetylases (HDACs). Arabidopsis HDAC genes (AtHDACs) compose a large gene family, and distinct phenotypes among AtHDAC mutants reflect the functional specificity of individual AtHDACs. However, the mechanisms underlying this functional diversity are largely unknown. Here, we show that POWERDRESS (PWR), a positive regulator of floral stem cell maintenance, interacts with HDA9 and promotes histone H3 deacetylation possibly by facilitating HDA9 function at target chromatin. The PWR SANT2 domain, which is homologous to that of subunits in animal HDAC complexes, showed specific binding affinity to acetylated histone H3. Three lysine residues (K9, K14 and K27) of H3 retained hyperacetylation status in both pwr and hda9 mutants. Genome wide H3K9 and H3K14 acetylation levels were generally elevated, and a large portion of acetylated targets overlapped between the pwr and hda9 mutants. Comparative analysis revealed a correlation between gene expression and histone H3 acetylation status in the pwr and hda9 mutants. In addition, PWR and HDA9 modulated the AGAMOUS-LIKE 19 (AGL19)-mediated flowering time pathway through histone H3 deacetylation. Finally, PWR was shown to physically interact with HDA9. We therefore propose that PWR acts as a subunit in a complex with HDA9 to negatively regulate the acetylation of specific lysine residues of histone H3 at genomic targets.
2017-01-25 | GSE89769 | GEO
Project description:Histone acetylation is a major epigenetic control mechanism that is tightly linked to the promotion of gene expression. Histone acetylation levels are balanced through the opposing activities of histone acetyltransferases (HATs) and histone deacetylases (HDACs). Arabidopsis HDAC genes (AtHDACs) compose a large gene family, and distinct phenotypes among AtHDAC mutants reflect the functional specificity of individual AtHDACs. However, the mechanisms underlying this functional diversity are largely unknown. Here, we show that POWERDRESS (PWR), a positive regulator of floral stem cell maintenance, interacts with HDA9 and promotes histone H3 deacetylation possibly by facilitating HDA9 function at target chromatin. The PWR SANT2 domain, which is homologous to that of subunits in animal HDAC complexes, showed specific binding affinity to acetylated histone H3. Three lysine residues (K9, K14 and K27) of H3 retained hyperacetylation status in both pwr and hda9 mutants. Genome wide H3K9 and H3K14 acetylation levels were generally elevated, and a large portion of acetylated targets overlapped between the pwr and hda9 mutants. Comparative analysis revealed a correlation between gene expression and histone H3 acetylation status in the pwr and hda9 mutants. In addition, PWR and HDA9 modulated the AGAMOUS-LIKE 19 (AGL19)-mediated flowering time pathway through histone H3 deacetylation. Finally, PWR was shown to physically interact with HDA9. We therefore propose that PWR acts as a subunit in a complex with HDA9 to negatively regulate the acetylation of specific lysine residues of histone H3 at genomic targets.
2017-01-25 | GSE89768 | GEO
Project description:Although the interplay of covalent histone acetylation/deacetylation and ATP-dependent chromatin remodeling is crucial for the regulation of chromatin structure and gene expression in eukaryotes, the underlying molecular mechanism in plants remains largely unclear. Here we show a direct interaction between Arabidopsis SWI3B, an essential subunit of the SWI/SNF chromatin-remodeling complex, and the RPD3/HDA1-type histone deacetylase HDA6 both in vitro and in vivo. Furthermore, SWI3B and HDA6 co-repress the transcription of a subset of transposons. Both SWI3B and HDA6 maintain transposon silencing by decreasing histone H3 acetylation but increasing histone H3 lysine 9 di-methylation, DNA methylation and nucleosome occupancy. Our findings reveal that SWI3B and HDA6 may act in the same corepressor complex to maintain transposon silencing in Arabidopsis.
2021-06-20 | GSE133235 | GEO
Project description:Powerdress Mediated Histone Deacetylation Is Essential For Thermomorphogenesis In Arabidopsis Thaliana
| PRJNA395465 | ENA
Project description:Polyploidy is a widespread phenomenon in flowering plant species. Polyploid plants frequently exhibit considerable transcriptomic alterations after whole-genome duplication (WGD). It is known that the transcriptomic response to tetraploidization is ecotype-dependent in Arabidopsis. Nevertheless, the biological significance and the underlying mechanism are unknown. Here, we showed that 4x Col-0 and 4x Ler presented different flowering times, with a delayed flowering time in 4x Col-0 but not in 4x Ler. We found that the expression of FLOWERING LOCUS C (FLC), the major repressor of flowering, was significantly increased in 4x Col-0 but subtle change in 4x Ler. Moreover, the level of a repressive epigenetic mark, trimethylation of histone H3 at lysine 27 (H3K27me3), was significantly decreased in 4x Col-0 but not in 4x Ler, potentially leading to different transcription levels of FLC and flowering time in 4x Col-0 and 4x Ler. Apart from the FLC locus, hundreds of genes showed differentially H3K27me3 alterations in 4x Col-0 and 4x Ler. Comparably, LIKE HETEROCHROMATIN PROTEIN 1 (LHP1) and transcription factors required for H3K27me3 deposition presented differential transcriptional changes between 4x Col and Ler, potentially account for differential H3K27me3 alterations in 4x Col-0 and Ler. Last, we found that the natural 4x Arabidopsis ecotype Wa-1 presented early flowering time, associated with low expression and high H3K27me3 of FLC. Taken together, our results showed a role of H3K27me3 alterations in response to genome duplication in Arabidopsis autopolyploids and that flowering time variation potentially functions in autopolyploid speciation.
2022-01-01 | GSE185114 | GEO
Project description:We show that in Arabidopsis SIN3 LIKE (SNL)family genes encoding a scoffold protein for assembly of histone deacetylase complex, directly regulate the expression of an FT activator and three FT repressors to regulate the transition to flowering in short days and long days, respectively. Under inductive long days, SNLs including SIN3 LIKE 1(SNL1) to SNL5, function in partial redundancy to repress the expression of three AP2 family transcription factors that repress FT expression, and thus mediate long-day induction of FT expression and promote the transitiion to flowering. In contrast, under non-inductive short days SNLs act to inhibit the floral transition, partly through direct repression of a MADS box transcriptional factor that promotes FT expression. Thus, our results reveal that SNLs, through histone deacetylation, play a novel dual role for the control of flowering in the long-day plant Arabidopsis: inhibiting flowering when the day length is shorter and promoting the floral transition when days become longer than a threshold length.
2019-06-28 | GSE131808 | GEO
Project description:We report POWERDRESS (PWR), a SANT domain containing protein known to facilitate the deacetylation of lysine rich residues of histone H3 by HISTONE DEACETYLASE 9 (HDA9), to play key role in temperature induced growth in Arabidopsis thaliana. Mutations in PWR showed severe attenuation in high temperature associated phenotypes viz., temperature-induced hypocotyl elongation, petiole elongation and early flowering. The study involved analysing the impact of the loss of PWR on the transcriptome in response to changes in ambient temperature. About one hundred 6 day old seedlings of wild type (Col-0) and pwr-2 mutant (in Col-0 background) were grown at 23 °C in short days (SD) photoperiod in growth chambers (GR-36, Percival Scientific, Canada). Half of the samples were then shifted to 27°C under short day photoperiod. Total RNA was extracted from whole seedlings grown at 23 °C and 27°C after two hours. Two biological replicates were used for Col-0 and pwr-2 samples. RNA was extracted using Isolate II RNA plant kit (Bioline Pty Ltd, Australia). RNA-Seq libraries were generated on Illumina HiSeqTM 2000 platform using paired-end sequencing of 90 bp in length at BGI-Shenzen (Beijing Genomics Institute). Gene expression analysis was performed using DESeq2 (v1.14.1) differential expression analysis pipeline.
2017-12-01 | GSE101782 | GEO