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Journal of Clinical Microbiology, August 2000, p. 2917-2922, Vol. 38, No. 8
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Sequence Analysis of the ank Gene of Granulocytic Ehrlichiae

Robert F. Massung,1,* Jessica H. Owens,1 David Ross,1 Kurt D. Reed,2 Miroslav Petrovec,3 Anneli Bjoersdorff,4 Richard T. Coughlin,5 Gerald A. Beltz,5 and Cheryl I. Murphy5

Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia1; Marshfield Clinic and Marshfield Medical Research Foundation, Marshfield, Wisconsin2; Institute of Microbiology and Immunology, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia3; Department of Clinical Microbiology, Kalmar County Hospital, Kalmar, Sweden4; and Aquila Biopharmaceuticals, Inc., Framingham, Massachusetts5

Received 3 January 2000/Returned for modification 14 March 2000/Accepted 28 April 2000

The ank gene of the agent of human granulocytic ehrlichiosis (HGE) codes for a protein with a predicted molecular size of 131.2 kDa that is recognized by serum from both dogs and humans infected with granulocytic ehrlichiae. As part of an effort to assess the phylogenetic relatedness of granulocytic ehrlichiae from different geographic regions and in different host species, the ank gene was PCR amplified and sequenced from a variety of sources. These included 10 blood specimens from patients with confirmed human granulocytic ehrlichiosis (three from New York, four from Wisconsin, two from Slovenia, and one from Sweden). Also examined was a canine granulocytic ehrlichia sample obtained from Minnesota, Ehrlichia equi from California, Ehrlichia phagocytophila from Sweden, and the granulocytic ehrlichia isolate USG3. The sequences showed a high level of homology (>95.5% identity), with the lowest homology occurring between a New York HGE agent and the Swedish E. phagocytophila. Several 3-bp deletions and a variable number of 51- and 81-bp direct repeats were noted. Although the North American HGE sequences showed the highest conservation (>98.1% identity), phylogenetic analyses indicated that these samples represent two separate clades, one including the three New York HGE samples and the USG3 strain and another with the Wisconsin HGE and Minnesota canine sequences. Two of the New York samples and the USG3 strain showed 100% identity over the entire 3,696-bp product. Likewise, three of the Wisconsin human samples and the Minnesota dog sample were identical (3,693 bp). Whereas phylogenetic analysis showed that the E. equi sequence was most closely related to the Upper Midwest samples, analysis of the repeat structures showed it to be more similar to the European samples. Overall, the genetic analysis based on the ank gene showed that the granulocytic ehrlichiae are closely related, appear to infect multiple species, and can be grouped into at least three different clades, two North American and one European.

* Corresponding author. Mailing address: Centers for Disease Control and Prevention, 1600 Clifton Rd., MS G-13, Atlanta, GA 30333. Phone: (404) 639-1082. Fax: (404) 639-4436. E-mail: rfm2{at}cdc.gov.

Journal of Clinical Microbiology, August 2000, p. 2917-2922, Vol. 38, No. 8
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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