Establishment of transient and stable transfection systems for Babesia ovata

Bovine babesiosis is a tick-borne disease caused by several species of Babesia which produce acute and fatal disease in cattle and affect livestock industry worldwide. Babesia ovata is a benign species widespread in east Asian countries and causes anemia, particularly in cattle which are co-infected...

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Veröffentlicht in:Parasites & vectors 2016-03, Vol.9 (1), p.171-171, Article 171
Hauptverfasser: Hakimi, Hassan, Yamagishi, Junya, Kegawa, Yuto, Kaneko, Osamu, Kawazu, Shin-Ichiro, Asada, Masahito
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container_title Parasites & vectors
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creator Hakimi, Hassan
Yamagishi, Junya
Kegawa, Yuto
Kaneko, Osamu
Kawazu, Shin-Ichiro
Asada, Masahito
description Bovine babesiosis is a tick-borne disease caused by several species of Babesia which produce acute and fatal disease in cattle and affect livestock industry worldwide. Babesia ovata is a benign species widespread in east Asian countries and causes anemia, particularly in cattle which are co-infected with Theileria orientalis. The development of genetic manipulation methods is necessary to improve our understanding of the basic biology of protozoan pathogens toward a better control of disease. Such tools have not been developed for B. ovata, and are the aim of this study. In this study we transfected constructs that were designed to evaluate the ability of several B. ovata promoter candidates to drive expression of a reporter luciferase. We found that the elongation factor-1 alpha intergenic region (ef-1α IG) and the actin 5' non-coding region (NR) had highest promoter activities. To establish a stable transfection system, we generated a plasmid construct in which the ef-1α IG promoter drives gfp expression, and the actin 5' NR mediates expression of the selectable marker hdhfr. The plasmid was designed for episomal transfection, as well as to integrate by double cross-over homologous recombination into the ef-1α locus. Circular or linearized plasmid was transfected by electroporation into in vitro cultured B. ovata and retention of the plasmid was facilitated by drug selection with 5 nM WR99210 initiated 48 h after transfection. After one-week cultivation with WR99210, GFP-expressing parasites were observed by fluorescence microscopy. Integration of the plasmid construct into the ef-1α locus was confirmed by PCR, Southern blot analysis, and sequencing of recombination sites. These results confirm successful development of a stable transfection system for B. ovata. The current study provides a fundamental molecular tool to aid in molecular and cellular studies of B. ovata.
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vectors</jtitle><addtitle>Parasit Vectors</addtitle><date>2016-03-23</date><risdate>2016</risdate><volume>9</volume><issue>1</issue><spage>171</spage><epage>171</epage><pages>171-171</pages><artnum>171</artnum><issn>1756-3305</issn><eissn>1756-3305</eissn><abstract>Bovine babesiosis is a tick-borne disease caused by several species of Babesia which produce acute and fatal disease in cattle and affect livestock industry worldwide. Babesia ovata is a benign species widespread in east Asian countries and causes anemia, particularly in cattle which are co-infected with Theileria orientalis. The development of genetic manipulation methods is necessary to improve our understanding of the basic biology of protozoan pathogens toward a better control of disease. Such tools have not been developed for B. ovata, and are the aim of this study. In this study we transfected constructs that were designed to evaluate the ability of several B. ovata promoter candidates to drive expression of a reporter luciferase. We found that the elongation factor-1 alpha intergenic region (ef-1α IG) and the actin 5' non-coding region (NR) had highest promoter activities. To establish a stable transfection system, we generated a plasmid construct in which the ef-1α IG promoter drives gfp expression, and the actin 5' NR mediates expression of the selectable marker hdhfr. The plasmid was designed for episomal transfection, as well as to integrate by double cross-over homologous recombination into the ef-1α locus. Circular or linearized plasmid was transfected by electroporation into in vitro cultured B. ovata and retention of the plasmid was facilitated by drug selection with 5 nM WR99210 initiated 48 h after transfection. After one-week cultivation with WR99210, GFP-expressing parasites were observed by fluorescence microscopy. Integration of the plasmid construct into the ef-1α locus was confirmed by PCR, Southern blot analysis, and sequencing of recombination sites. These results confirm successful development of a stable transfection system for B. ovata. The current study provides a fundamental molecular tool to aid in molecular and cellular studies of B. ovata.</abstract><cop>England</cop><pub>BioMed Central</pub><pmid>27008652</pmid><doi>10.1186/s13071-016-1439-z</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record>
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subjects actin
anemia
Artificial Gene Fusion
Babesia
Babesia - genetics
babesiosis
cattle
cattle diseases
disease control
drugs
East Asia
electroporation
fluorescence microscopy
gene expression
Gene Expression Profiling
Gene Targeting
Genes, Reporter
genetic engineering
Genetic Vectors
Genetics, Microbial - methods
Homologous Recombination
in vitro culture
intergenic DNA
livestock and meat industry
loci
luciferase
mixed infection
parasites
pathogens
Plasmids
polymerase chain reaction
Promoter Regions, Genetic
Protozoa
Southern blotting
Theileria orientalis
transfection
Transfection - methods
title Establishment of transient and stable transfection systems for Babesia ovata
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