CC BY
21
экспериментальные исследования в Биологии и медицине
УДК 579.25;579.61
T. Masuzawa 1, N. Ohashi 2, M.A. Khasnatinov 3, G.A. Danchinova 3, L.I. Ivanov 4, T. Fukui 1,
Y. Okamoto 1, M.J. Pan 4, N. Koizumi 5
comparative study of anaplasma in japan and other countries
1 Chiba Institute of Science (CIS), Choshi, Japan 2 University of Shizuoka, Shizuoka, Japan 3 Scientific Center for Family health and human reproduction problems SB RAMS, Irkutsk, Russia
4 Plague Control Station of Khabarovsk, Khabarovsk, Russia 5 Central Taiwan University of Science and Technology, Taichung, Taiwan 6 National Institute of Infectious Diseases, Tokyo, Japan
To determine the reservoir animals and vector ticks for Anaplasma phagocytophilum in Far East Asia, which causes human granulocytic anaplasmosis, we analyzed, tissue samples from deer and boars in Japan, rodents in Taiwan and. Ixodes persulcatus in Russia by PCR-targeted. to 16S rDNA. Anaplasma species including Anaplasma bovis and. Anaplasma centrale-infected. wild, deer and. boars were detected. The detection rates for A. phagocytophilum, A. bovis and A. centrale in deer were 15,6 %, 21,9 % and 37,5 %, respectively. These infection rates in wild boar were 3,6 %, 17,9 % and 3,6 %, respectively. Wild rodents captured in Taiwan were positive for A. phagocytophilum. and. A. bovis. Prevalence rate of A. phagocytophilum. on I. persulcatus ticks in Irkutsk and in Khabarovsk were 6,3 % and 11,3 %, respectively. The 16SrDNA sequences detected from Russian ticks were identical to those of A. phagocytophilum. detected in US and. Europe, and. from tick Ixodes ovatus and Ixodes persulcatus in Japan. However the sequence detected from deer and boars in Japan were identical to sequences previously detected from deer and cattle in Japan, and. showed, less similarity (98,6 %) with, typical A. phagocytophilum.. Sequences detected, from wild, rodents collected, in Taiwan showed, higher similarity (99,7 %) with, typical A. phagocytophilum, but formed, the branch, from those of A. phagocytophilum. detected, in US and Europe. The finding suggests that the A. phagocytophilum-related sequence detected, from deer and boars in Japan, and. wild, rodents in Taiwan were different from those of typical A. phagocytophilum. found, in Ixodid ticks. Key words: Anaplasma phagocytophilum, boar, deer, Rattus
сравнительное исследование анаплазм в Японии и других странах
Т. Масузава 1, Н. Охаши 2, М.А. Хаснатинов 3, Г.А. Данчинова 3, Л.И. Иванов 4, Т. Фукуи 1,
Й. Окамото 1, М.Дж. Пан 4, Н. Коизуми 5
1 Chiba Institute of Science (CIS), Choshi, Japan 2 University of Shizuoka, Shizuoka, Japan 3 «Научный центр проблем здоровья семьи и репродукции человека» СО РАМН, Иркутск, Россия 4Хабаровская противочумная станция Роспотребнадзора, Хабаровск, Россия 5 Central Taiwan University of Science and Technology, Taichung, Taiwan 6 National Institute of Infectious Diseases, Tokyo, Japan
С целью установления животных-резервуаров и клещей-переносчиков бактерий Anaplasma phagocytophilum. — возбудителя, гранулоцитарного анаплазмоза человека — на дальнем, востоке Азии мы. проанализировали образцы, тканей оленей и. кабанов из Японии, грызунов из Тайваня и. клещей Ixodes persulcatus в России с помощью ПЦР, направленной на амплификацию гена 16S rRNA. Дикие олени и. кабаны были, заражены Anaplasma bovis и. Anaplasma centrale. Зараженность диких оленей A. phagocytophilum, A. bovis and. A. centrale составила 15,6, 21,9 и. 37,5 % соответственно. Среди диких кабанов зараженность этими микроорганизмами составила 3,6 %, 17,9 % и. 3,6 % соответственно. Дикие грызуны, отловленные на Тайване, были заражены A. phagocytophilum. и A. bovis. Зараженность клещей I. persulcatus в Иркутске и. Хабаровске составила 6,3 и. 11, 3 % соответственно. Нуклеотидные последовательности гена 16S rRNA микроорганизмов, обнаруженных в клещах из России, были идентичны, последовательностям. A. phagocytophilum, обнаруженным в США и. Европе, а также последовательностям. A. phagocytophilum. из клещей Ixodes ovatus и. Ixodes persulcatus из Японии. Однако, последовательности, из оленей и. кабанов Японии были, идентичны. A. phagocytophilum, выделенным, ранее от. оленей и. крупного рогатого скота в Японии и. обладали, меньшей схожестью (98,6 %) с типичными A. phagocytophilum.. Последовательности, обнаруженные в грызунах на Тайване, были, более сходны, с типичными A. phagocytophilum. (99,7 % ), однако на филогенетическом древе формировали, ветвь, отдельную от. A. phagocytophilum. из Европы, и США. Данные результаты, позволяют, предположить, что A. phagocytophilum, инфицирующие диких оленей и. кабанов в Японии и. грызунов на Тайване, существенно отличаются, от. типичных A. phagocytophilum, инфицирующих иксодовых клещей. Ключевые слова: Anaplasma phagocytophilum, кабан, олень, Rattus
Anaplasmosis is a tick-borne infectious disease of cattle, sheep, horse and other domestic ruminants caused by a gram-negative bacterium, Anaplasma species. Among Anaplasma species, Anaplasma phagocytophilum has been recognized as a tick-borne fever agent of cattle, sheep, goats and horses in the United States and Europe [4]. In 1990, it has been recognized that A. phagocytophilum potentially causes illness in humans (human granulocytic anaplasmosis, HGA) in the United States [1]. Roe and red deer and wild boar has been recognized for reservoir host for A. phagocytophilum in Europe. We previously demonstrated A. phagocytophilum infection in Ixodes persulcatus and Ixodes ovatus in Japan by PCR [3]. The 16S rDNA sequence detected from I. ovatus and I. persulcatus in Japan showed higher similarity with A. phagocytophilum isolated from US patient. The aim of this study was to determine reservoir host of A. phagocytophilum in Japan and Taiwan.
materials and methods
Total DNA was extracted from the disrupted blood and/or spleen samples of 56 wild boars (Sus scrofa) and 32 Sika deer (Cervus nippon) captured in Japan, 138 wild small mammals (7 species) using QuickGene-800 Nucleic-acid Isolation System. To detect specific DNA of Anaplasma species, 16S rDNA was amplified with forward primer EC9 and reverse primer EC12A [2] in the first-step PCR. For the nested PCR, mixtures of forward primer Abpp (5'-TACTGCCAGACTAGAGTCCGGGA-3') specific to sequences for Anaplasma bovis, A. phagocytophilum, and Anaplasma platys, and another forward primer Acom (5'- TACTGCAGGACTAGAGTCCGGAA-3') specific to sequences for Anaplasma centrale, Anaplasma ovis and Anaplasma marginale, and reverse primer AP-R (5'- TTGCAACCTATTGTAGTC-3') were used as inner primer sets, which amplified approximately 600 base pairs of DNA. For DNA sequencing analysis, the nested PCR amplicon purified with Microcon-PCR purification column (Millipore) was subjected to DNA cycle-sequencing analysis using BigDye Terminator v3.1 cycle sequencing kit (Applied Biosystems) with an ABI 3130-Avant Genetic Analyzer. A phylogenetic tree was constructed on the basis of the alignment of 16S rDNA sequences (600bp) and the previously published sequences by Clustal W algorithm using sequence analysis software, MegAlign (DNASTAR).
results and discussion
Prevalence rate of A. phagocytophilum on I. persulcatus ticks in Irkutsk and in Khabarovsk were 6,3 % (28/445) and 11,3 % (23/204), respectively. A phylogenetic tree was constructed on the basis of 16S-rDNA sequence. The 16S rDNA sequences detected from Russian ticks were identical to those of A. phagocytophilum detected in US and Europe, and from tick Ixodes ovatus and Ixodes persulcatus in Japan.
Infection rates for A. phagocytophilum, A. bovis and A. centrale in Sika deer in Japan were 15,6 %, 21,9 % and 37,5 %, respectively. These rates in wild boar were 3,6 %, 17,9 % and 3,6 %, respectively. All positive
results were obtained from whole blood samples, but not from spleen samples. A. phagocytophilum detected from deer and boars form cluster with these sequences previously found from deer (AB196720, AB196721, AB454076) and cattle (EU368727, EU368728) in Japan and that from dog in South Africa (AY570540). However, these branched from those detected from a patient in USA (AF093789), horse in Sweden (AY527214) and USA (AF172164), I. ovatus (AY969012) in Japan and I. persulcatus in Russia (k-7, 7-109, HM366590). Furthermore, these 16S rDNA-PCR positive samples gave negative result on p44/msp2 PCR targeted to outer membrane protein gene. The finding suggests that the agents detected are genetically related, but different from the A. phagocytophilum that cause HGA in USA and European countries, and also those detected from ixodid ticks in Japan and Russia.
16S rDNA sequence related to Anaplasma species were detected from wild rodent, Rattus losea among wild small mammals (7 species, R. losea, Apodemus agrarius, Mus fromosanus, Mus caroli, Bandicota indica, Suncusmurinus, Crocidura suaveolens). These sequences (99-73, 99-58) were identical to those detected from R. losea (HM439430) and Niviventer coxingi (DQ458808) in China and showed high similarity (99.7 %) with typical A. phagocytophilum detected from Ixodid ticks in US, Europe and Asia.
During the study, we detected Anaplasma species sequences identified as A. centrale and A. bovis, respectively. A. centrale was found to be the only bovine anaplasmosis pathogen in Japan and usually causes mild anemia. Ten and 2 sequences detected from deer and boars, respectively, were identical to that of A. centrale detected in cattle (AF283007), and Sika deer in in Japan (AB21116). The sequences detected in Japan blanched from these sequences detected in Europe EF520686, EF520690) and Africa (AF414869) (similarity value 98.5-98.6 %), indicating genetic differences between the pathogen in Japan and those in other countries. This classification remains as a problem that should be study. Furthermore, A. bovis sequences were detected from deer and also boars. A. bovis has been previously detected in Sika deer (AB21116), cattle (FJ169957), and vector ticks, Haemaphysalis longicornis (AB196475) and Haemaphysalis megaspinosa. A. bovis mostly infects cattle in Africa and is phylogenetically more closely related to A. phagocytophilum than A. centrale.
Further study is needed to confirm reservoir animals for A. phagocytophilum, and genetic characterization of A. phagocytophilum in Japan and Russia to understanding the status of diseases associated with these agents.
acknowledgments
We are grateful to Dainihon Ryoyukai for providing tissue and blood samples of wild boars and deer. This study was supported in part by a Grant-in-Aid for Scientific Research B (No. 20406011) from the Japan Society for the Promotion of Science (JSPS) and a Health Sciences Research Grant-in-Aid for Emerging and Re-emerging Infectious Diseases (H16-Shinkou-
Fig. 1. Phylogenetic tree constructed on the basis of 16S rDNA sequences.
Ippan-033) from the Ministry of Health, Labour and Welfare of Japan.
The phylogenetic tree was constructed using the alignment of 16S rDNA sequences by Clustal W algorithm followed by the neighbor-joining method with 1000 bootstrap resamplings. Sequence accession numbers are in parentheses. Bold type indicates sequences determined by this study.
references
1. Chen S.M. et al. Identification of a granulo-cytotropic Ehrlichia species as the etiologic agent of human disease // J. Clin. Microbiol. — 1994. — Mar; Vol. 32 (3). - P. 589-595.
2. Dumler J.S. et al. Reorganization of genera in the families Rickettsiaceae and Anaplasmataceae in
the order Rickettsiales: unification of some species of Ehrlichia with Anaplasma, Cowdria with Ehrlichia and Ehrlichia with Neorickettsia, descriptions of six new species combinations and designation of Ehrlichia equi and 'HGE agent' as subjective synonyms of Ehrlichia phagocytophila // Int J Syst Evol Microbiol. — 2001. — Nov; Vol. 51 (Pt 6). - P. 2145-2165.
3. Kawahara M. et al. Novel genetic variants of Anaplasma phagocytophilum, Anaplasma bovis, Anaplasma centrale, and a novel Ehrlichia sp. in wild deer and ticks on two major islands in Japan // Appl Environ Microbiol. - 2006. - Feb; Vol. 72 (2). -P. 1102-1109.
4. Ohashi N. et al. Anaplasma phagocytophilum-infected ticks / // Emerg Infect Dis. - 2005. - Nov; Vol. 11 (11). - P. 1780-1783.
Сведения об авторах
Masuzawa T. - PhD, профессор Chiba Institute of Science (CIS), Choshi, Japan (e-mail: masuzawat@cis.ac.jp)
Ohashi N. - PhD, профессор, зам. декана School of Food and Nutritional Sciences, University of Shizuoka, Shizuoka, Japan
Khasnatinov M.A. - к.б.н., ведущий научный сотрудник лаборатории трансмиссивных инфекций ФГБУ «Научный центр
проблем здоровья семьи и репродукции человека» СО РАМН (664025, г Иркутск, ул. К. Маркса, 3; тел. (3952) 333-971)
DanchinovaG.A. - д.б.н., руководитель лаборатории трансмиссивных инфекций Научного центра проблем здоровья семьи
и репродукции человека СО РАМН (664025, г. Иркутск, ул. К. Маркса, 3; тел.: (3952)333-971; e-mail: dan-chin@yandex.ru)
IvanovL.I. - д.м.н., директор Хабаровской противочумной станции Роспотребнадзора РФ
Fukui T. - научный сотрудник, Chiba Institute of Science (CIS), Choshi, Japan
Okamoto Y. - научный сотрудник, Chiba Institute of Science (CIS), Choshi, Japan
Pan M.J. - научный сотрудник Хабаровской противочумной станции Роспотребнадзора РФ
Koizumi N. - PhD, научный сотрудник National Institute of Infectious Diseases, Tokyo, Japan
