Shotgun sequencing of a large segment of DNA involves random fragmentation of the target region into smaller segments that are subsequently cloned into a bacteriophage M13 vector. The goal is to create a library of overlapping clones that provide at least fivefold coverage over the entire length of the target fragment. - [Read Generation of a Library of Randomly Overlapping DNA Inserts Protocol]
Shotgun Library Construction Protocol- http://www.oardc.ohio-state.edu/stockingerlab/Protocols/ShotgunLibraryConstruction%28EJSVersion-050511%29.pdf