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Users can clearly understand the function of the database and detailed statistics. In current version of PlantCADB reported a total of 18,065,954 accessible chromatin regions from more than 600 samples. We manually collected data related to chromatin accessibility of four types of ATAC-seq(302), DNase-seq(317), FAIRE-seq(15) and MNase-seq(4) from GEO and SRA databases, a total of 37 plant species, which committed to integrating and analyzing chromatin accessibility data of all available on plant species.
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Users can select multiple filter criteria to query the data they are interested in, and each sample is followed by a brief description of the data.To view the chromatin accessibility area of the specified sample, the user simply clicks “Sample ID” to view it.We have named different data types differently, ATAC-seq as ”Sample_00”, DNase-seq as ”Sample_01”, FAIRE-seq as ”Sample_02” and MNase-seq as ”Sample_03”.
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Users can obtain detailed information about samples of interest, including sample overview, chromosome number pie chart of chromatin accessibility regions distribution, search result table, TF footprint annotation and peak annotation visualization.
PlantCADB used HINT footprint analysis based on hidden markov model (HMM) to obtain the analysis result of TF footprint. Because ATAC-seq data and DNase-seq data have different degrees of bias during the experiment, different protocols are used for different types of data, ATAC-seq data is based on ATAC-seq model, DNase-seq data is based on DNase-seq model. The result files we got include TFs with the Tag Count (TC), protection score, number of binding sites and footprint logo were identified for each sample.
PlantCADB uses CHIPseeker to realize the visualization function of peak mark. We support displaying chromatin accessibility areas in different ways, including profiles of peaks binding to TSS region, peaks coverage over chromosomes and Peak distribution map on chromosomes.
For detail about the accessible chromatin region, we provide more detailed TF footprint corresponding scores, the results of motif scan and associated genes. Motif Scanning includes location information, sequence scores, and matched sequences. We provide five analysis results for related genes, including overlap genes, proximal genes within ± 1kb, proximal genes within ± 10kb, proximal genes within ± 20kb and closet gene.