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Borrelia burgdorferi population kinetics and selected gene expression at the host-vector interface
Emir Hodzic1, Sunlian Feng, Kimberly J Freet
1Center for Comparative Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA.
Infection and Immunity
|June 18, 2002
Summary
Borrelia burgdorferi infection dynamics were studied in ticks and mice. Spirochete populations and gene transcription were analyzed, revealing bacterial activity during transmission and established infections.
Area of Science:
- Microbiology
- Infectious Diseases
- Vector-borne Illnesses
Background:
- Borrelia burgdorferi causes Lyme disease.
- Understanding its transmission cycle is crucial.
Purpose of the Study:
- To investigate Borrelia burgdorferi population dynamics and gene transcription in ticks and mouse skin.
- To analyze bacterial behavior during tick feeding and host infection.
Main Methods:
- Real-time quantitative PCR was used to quantify Borrelia burgdorferi populations (flaB DNA).
- Gene transcription of flaB, ospA, ospC, dbpA, and arp was analyzed.
- Studies were conducted in Ixodes scapularis ticks and mouse skin during infection acquisition and transmission.
Main Results:
- Ticks acquired B. burgdorferi rapidly, with increasing spirochete populations and active gene transcription during feeding.
- Transmission to mice was detected within 1 day of tick attachment.
- Mouse skin showed rising spirochete numbers and minimal transcription initially, followed by static populations and stable transcription in established infections.
- Reduced spirochete numbers were observed at tick attachment sites compared to non-attachment sites in mouse skin.
Conclusions:
- Borrelia burgdorferi actively replicates and transcribes genes within ticks during feeding and upon transmission to mice.
- Gene transcription patterns differ between early and established infection stages in the host.
- Tick attachment site influences local spirochete numbers but not gene expression levels.