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Tn916 transposition in Haemophilus influenzae Rd: preferential insertion into noncoding DNA
K E Nelson1, D L Richardson, B A Dougherty
1Institute for Genomic Research, Rockville, Maryland, USA.
Microbial & Comparative Genomics
|January 1, 1997
Summary
The conjugative transposon Tn916 preferentially integrates into noncoding DNA in Haemophilus influenzae. This gene disruption strategy targets A+T-rich intergenic regions, minimizing host cell function disruption.
Area of Science:
- Microbiology
- Genomics
- Molecular Biology
Background:
- The advent of complete genome sequencing enables high-throughput genetic studies.
- The conjugative transposon Tn916 is a tool for gene disruption.
Purpose of the Study:
- To assess the efficiency of Tn916-mediated gene disruption in Haemophilus influenzae Rd strain KW20.
- To characterize the insertion site preferences of Tn916 in this bacterium.
Main Methods:
- Inverse PCR, DNA sequencing, and genome mapping were used to identify transposon insertion sites.
- A hidden Markov model was developed to predict Tn916 target sites genome-wide.
Main Results:
- Tn916 insertion showed a preference for A+T-rich regions, particularly intergenic DNA.
- Intergenic DNA was found to be significantly more A+T-rich than coding sequences.
- Eighty percent of predicted high-scoring target sites were in noncoding regions.
Conclusions:
- Tn916 exhibits a strong preference for integrating into noncoding DNA in H. influenzae.
- This preference suggests an evolutionary adaptation to minimize disruption of essential host cell functions.