Project description:Provided data came from a detailed study on Nicotiana benthamiana 16c plants where we use Tobacco Rattle Virus (TRV) as a molecular switch to change the chromatin state of a reporter gene (P35S::GFP) from an actively transcribed to a transcriptionally silenced state. Our approach enables us to interrogate different chromatin states of the same locus with the same set of CRISPR/Cas9 genome editing reagents and systematically describe the effect of chromatin state on the frequency and type of mutations induced at various Cas9 targets in a huge set of independently edited cells.
Project description:We performed a large-scale genome-wide characterisation of indels generated following editing with CRISPR/Cas9. We used pools of sgRNAs and performed targeted capture and sequencing of the edited regions in HepG2 cells.
Project description:CRISPRs and TALENs are efficient systems for gene editing in many organisms including plants. In many cases the CRISPR-Cas or TALEN modules are expressed in the plant cell only transiently. Theoretically, transient expression of the editing modules should limit unexpected effects compared to stable transformation. However, very few studies have measured the off-target and unpredicted effects of editing strategies on the plant genome, and none of them have compared these two major editing systems. We conducted a comprehensive genome-wide investigation of off-target mutations using either a CRISPR-Cas9 or a TALEN strategy. We observed a similar number of SNVs and InDels for the two editing strategies compared to control non-transfected plants, with an average of 8.25 SNVs and 19.5 InDels for the CRISPR-edited plants, and an average of 17.5 SNVs and 32 InDels for the TALEN-edited plants. Interestingly, a comparable number of SNVs and InDels could be detected in the PEG-treated control plants. This shows that except for the on-target modifications, the gene editing tools used in this study did not show a significant off-target activity nor unpredicted effects on the genome, and that the PEG treatment in itself was probably the main source of mutations found in the edited plants.
Project description:We recreated the t(7;12) translocation in K562 cells by CRISPR/Cas9 to understand its effects on haematopoietic cells, which is of relevance to understand how this cytogenetic abnormalities causes and promotes acute leukaemia in infants. Wild-type K562 were edited by electroporation of ribonucleoprotein complexes consisting of Cas9 enzyme and two guide RNAs targeting patient-specific breakpoint loci. K562 electroporated with Cas9 enzyme only were used as control. Edited K562 harbouring the t(7;12) were single-cell cloned to obtain homogeneous populations (hereby referred to as K562-t(7;12)). We performed RNA sequencing analysis of K562-t(7;12) compared to K562 control to uncover transcriptional changes associated with the translocation.
Project description:To obtain better insight into the underlying mechanism of melatonin in switchgrass growth, flowering and defence, we performed proteomics analyses between transgenic lines overexpressing melatonin biosynthesis genes and transgenic control (expressing only the empty vector) plants.
