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United States Department of Agriculture

Agricultural Research Service


item Rurangirwa, Fred
item Brayton, Kelly
item Mc Guire, Travis
item Knowles, Donald - Don
item Palmer, Guy

Submitted to: International Journal of Systematic and Evolutionary Microbiology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/15/2002
Publication Date: N/A
Citation: N/A

Interpretive Summary: These data describe the organization of certain genes within Anaplasma marginale. The location and arrangement of these genes, using Rickettsia spp. as a standard are not maintained in Anaplasma marginale indicating the arrangement of the fmt gene is a late event in rickettsial evolution.

Technical Abstract: The organization of the rRNA genes of Anaplasma marginale, the type species of the genus Anaplasma, was identified to determine if the atypical rRNA gene arrangement identified in rickettsia preceded divergence of the order Rickettsiales into the families Anaplasmataceae and Rickettsiaceae. The rRNA genes are encoded by two unlinked units, each present in a single copy per A. marginale genome. The 16s rRNA gene is separated from the linked 235 and 5S rRNA genes by a minimum of 100 kb. Similar to species belonging to the genus Rickettsia, the typical bacterial 16S-23S-spacer region containing tRNA genes has been lost in A. marginale. In contrast, the fmt gene located upstream of the 23S rRNA gene in most Rickettsia spp. is not maintained in A. marginale, consistent with the fmt arrangement being a relatively late event in the evolution of rickettsial species.

Last Modified: 10/17/2017
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