They made the shelves lower and put more of the books facing out, optimized for browsing, rather than spine out, typical for high-density libraries.
High-density BAC library filters and BAC clones for three Oryza species were purchased from the Arizona Genomics Institute (USA).
In the present study, we constructed a high-density mutant library of soybean, which provide a potential to yield new alleles for soybean breeding.
General protocols for high-density BAC library filter screening and address determination of positive signals are publicly available from our website [ 18].
The hybridization-based approach is based on multi-dimensional pools of molecular markers or probes hybridizing with high-density BAC library screening membranes to identify the BAC clones associated with specific nucleotide sequences or genes.
Here we report the design and application of a phage-based transposition method that is compatible with a new NGS protocol and surmounts the many challenges associated with creating high-density transposon libraries in S. aureus.
Creation of high-density transposon libraries in S. aureus has been challenging because its thick cell wall precludes high-efficiency electroporation of DNA containing the transposon, and there are no systems in S. aureus for transposon delivery via conjugation [ 26- 28].
To estimate the percentage of chloroplast and mitochondrial DNA content in each library, one high-density filter from each library was screened separately with a pool of five E. globulus probes for chloroplast genes psbA, psbB, psbD, rbcL, ndhB and with a pool of probes for mitochondrial genes ccb256, ccb452, cox3 [ 69].
With removal of the Φ11 prophage, this strategy now allows us to create high-density transposon mutant libraries with a very low background of non-transposase catalyzed transposon integration using the phage-based transposition system in any strain of S. aureus that is transducible by Φ11.
Moreover, the genome coverage and quality of the libraries have been verified independently by screening high-density filters of the libraries with a set of single-copy genes or ESTs.
