Reductive evolution in bacteria: Buchnera sp., Rickettsia prowazekii and Mycobacterium leprae
2001
Reductive Evolution in Bacteria: Buchnera, Rickettsia, and Mycobacterium
publication
Evidence: moderate
Author Information
Author(s): Jo Wixon
Primary Institution: Bioinformatics Division, HGMP-RC, Hinxton, Cambridge, UK
Hypothesis
How does reductive evolution affect the genomes of obligate intracellular bacteria?
Conclusion
Obligate intracellular bacteria have significantly reduced genomes due to the loss of non-essential genes, influenced by their symbiotic relationships with hosts.
Supporting Evidence
- Buchnera has a genome roughly one-seventh the size of E. coli.
- Rickettsia prowazekii has lost many genes necessary for biosynthesis due to its intracellular lifestyle.
- Mycobacterium leprae has a genome that is more than 1 Mb smaller than that of M. tuberculosis.
Takeaway
Some bacteria have smaller genomes because they don't need certain genes anymore since they get what they need from their hosts.
Limitations
The study primarily focuses on three specific bacteria and may not represent all obligate intracellular bacteria.
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