Project description:Using CUT&Tag, a chromatin profiling technique, we show that TBP depletion via IAA surprisingly does not affect RNA Pol II transcription but affects RNA Pol III transcription. Additionally, induction of genes via heat shock and retinoic acid treatment does not require TBP. We also show that a metazoan specific paralog TRF2 does not compensate for TBP for RNA Pol II transcription and that the TFIID subunit of the Pre-initiation Complex can still form with specific subunits still binding onto DNA when TBP is depleted.
Project description:We developed scNanoSeq-CUT&Tag, a streamlined method by adapting a modified CUT&Tag protocol to Oxford Nanopore sequencing platform for efficient chromatin modification profiling at single-cell resolution. We firstly tested the performance of scNanoSeq-CUT&Tag on six human cell lines: K562, 293T, GM12878, HG002, H9, HFF1 and adult mouse blood cells, it showed that scNanoSeq-CUT&Tag can accurately distinguish different cell types in vitro and in vivo. Moreover, scNanoSeq-CUT&Tag enables to effectively map the allele-specific epigenomic modifications in the human genome andallows to analyze co-occupancy of histone modifications. Taking advantage of long-read sequencing,scNanoSeq-CUT&Tag can sensitively detect epigenomic state of repetitive elements. In addition, by applying scNanoSeq-CUT&Tag to testicular cells of adult mouse B6D2F1, we demonstrated that scNanoSeq-CUT&Tag maps dynamic epigenetic state changes during mouse spermatogenesis. Finally, we exploited the epigenetic changes of human leukemia cell line K562 during DNA demethylation, it showed that NanoSeq-CUT&Tag can capture H3K27ac signals changes along DNA demethylation. Overall, we prove that scNanoSeq-CUT&Tag is a valuable tool for efficiently probing chromatin state changes within individual cells.
Project description:Using NET-seq to profile nascent RNA transcription, we show that auxin-mediated depletion of TBP does not affect Pol II transcription and gene activation via heat shock.