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Infection and Immunity, May 2000, p. 2783-2790, Vol. 68, No. 5
Corixa Corporation1 and
Infectious Disease Research Institute,4
Seattle, Washington; Department of Medicine and Pathology,
Mayo Clinic, Rochester, Minnesota2; and
University of Connecticut School of Medicine, Farmington,
Connecticut3
Received 23 September 1999/Returned for modification 8 November
1999/Accepted 15 February 2000
Increased recognition of the prevalence of human babesiosis in the
United States, together with rising concern about the potential for
transmission of this infection by blood transfusion, has provided motivation to develop definitive serologic and molecular tests for the
causative agent, Babesia microti. To develop more sensitive and specific assays for B. microti, we screened a genomic
expression library with patient serum pools. This screening resulted in
the identification of three classes of novel genes and an additional two novel, unrelated genes, which together encode a total of 17 unique
B. microti antigens. The first class (BMN1-2 family) of genes encodes seven closely related antigens with a degenerate six-amino-acid repeat that shows limited homology to
Plasmodium sp. merozoite and sporozoite surface antigens. A
second class (BMN1-8 family) of genes encodes six related antigens, and
the third class (BMN1-17 family) of genes encodes two related antigens. The two remaining genes code for novel and unrelated sequences. Among
the three classes of antigens and remaining novel sequences, five were
chosen to code for the most immunodominant antigens (BMN1-2, -9, -15, and -17 and MN-10). Western blot analysis with the resulting
recombinant proteins indicated that these antigens were targets of
humoral immune responses during B. microti infection in humans.
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Serological Expression Cloning of Novel
Immunoreactive Antigens of Babesia microti
*
Corresponding author. Mailing address: Corixa
Corporation, 1124 Columbia St., Suite 200, Seattle, WA 98104. Phone:
(206) 754-5797. Fax: (206) 754-5715. E-mail: lodes{at}corixa.com.
Present address: Infectious Disease Research Institute and Corixa
Corporation, Seattle, WA 98104.
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