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Genetic manipulation of
Clostridium difficile
is notoriously difficult, currently there is only one reliable method for generating random mutations in the organism and that is to use the conjugative transposon Tn
916
. Tn
916
enters the genome of most strains of
C. difficile
with no obvious target site preference. In order to use the genome strain
C. difficile
630 for transposon mutagenesis a erythromycin-sensitive derivative
C. difficile
630Δ
erm
was constructed and the Tn
916
derivative, Tn
916
ΔE, was shown to enter the genome at multiple sites enabling the construction of a Tn
916
insertion library.