Experiment: | 478 |
Title: | Expression analysis in HDA6 mutants |
Date: | 2009-11-04 |
Description: | In addition to the canonical RNAi pathways that targets mRNAs in the cytoplasm, several RNA-dependent pathways operate in the nucleus to induce sequence-specific epigenetic modifications. One specialized type of RNAi-mediated pathway is RNA-directed DNA methylation (RdDM). During RdDM, nuclear DNA with sequence identity to the trigger dsRNA is de novo methylated at almost all cytosine residues, providing a mark for the formation of transcriptionally silent heterochromatin. Genetic forward screens identified the RPD3-like histone deacetylase HDA6 as the enzyme responsible for the histone deacetylation step of RdDM and suggest that HDA6 might have acquired specific functions for RNA-directed transcriptional silencing processes [Aufsatz et al., 2002a; Aufsatz et al., 2002b].Complete loss-of-function mutants for AtHDA6 (rts1-1; RNA-mediated transcriptional gene silencing) exhibit reactivation of RdDM-silenced promoters, despite the continuous presence of the silencing-inducing RNA signal. One of the found mutant alleles, rts1-5, has an amino acid substitution located at a conserved position within the HDAC domain (Naumann et al., manuscript in preparation). This mutant is characterized by strong reactivation of an RdDM-silenced target promoter, despite maintaining wild-type levels of cytosine methylation.An evaluation of the transcription pattern among the mutants with opposite methylation phenotype and wild-type plants should show which genes are differentially regulated between the mutants in comparison to wild-type plants. |
ftp Link: | ftp Link |
Slide ID | Slide Name | Genetic Background | Tissue | Stock Code | Cel File |
---|---|---|---|---|---|
Schuller_1-1_double-transformant_Rep1_ATH1_rpt | 7778585 | whole plant | Schuller_1-1_double-transformant_Rep1_ATH1_Rpt.CEL | ||
Schuller_1-2_double-transformant_Rep2_ATH1 | 7778586 | whole plant | Schuller_1-2_double-transformant_Rep2_ATH1.CEL | ||
Schuller_1-3_double-transformant_Rep3_ATH1 | 7778587 | whole plant | Schuller_1-3_double-transformant_Rep3_ATH1.CEL | ||
Schuller_1-4_null-mutant_Rep1_ATH1_rpt | 7778588 | Col-0 | whole plant | Schuller_1-4_null-mutant_Rep1_ATH1.CEL | |
Schuller_1-5_null-mutant_Rep2_ATH1 | 7778589 | Col-0 | whole plant | Schuller_1-5_null-mutant_Rep2_ATH1_Rpt.CEL | |
Schuller_1-6_null-mutant_Rep3_ATH1 | 7778590 | Col-0 | whole plant | Schuller_1-6_null-mutant_Rep3_ATH1.CEL | |
Schuller_1-7_amino-acid-substitution_Rep1_ATH1 | 7778591 | Col-0 | whole plant | Schuller_1-7_amino-acid-substitution_Rep1_ATH1.CEL | |
Schuller_1-8_amino-acid-substitution_Rep2_ATH1 | 7778592 | Col-0 | whole plant | Schuller_1-8_amino-acid-substitution_Rep2_ATH1.CEL | |
Schuller_1-9_amino-acid-substitution_Rep3_ATH1_rpt | 7778593 | Col-0 | whole plant | Schuller_1-9_amino-acid-substitution_Rep3_ATH1_Rpt.CEL |