Transposon insertion site sequencing (TIS) is a technique that
determines the insertion profile of a transposon mutant library
by massive parallel sequencing of transposon-genomic
DNA junctions. Because the transposon insertion profile reflects
the abundance of each mutant in the library, it provides
information to assess the fitness contribution of each genetic
locus of a bacterial genome in a specific growth condition or
strain background. Although introduced only about a dozen
years ago, TIS has become an important tool in bacterial genetics
that provides clues to study biological functions and
regulatory mechanisms. Here, I describe a protocol for generating
high density transposon insertion mutant libraries
and preparing Illumina sequencing samples for mapping the
transposon junctions of the transposon mutant libraries using
Pseudomonas aeruginosa as an example.
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