Dual presence of Anaplasma phagocytophilum and its closely related Anaplasma sp. in ixodid ticks in Hokkaido, Japan, and their specific molecular detection.
Anaplasma phagocytophilum causes human granulocytic anaplasmosis (HGA) and tick-borne fever in ruminants. A closely related and potentially novel Anaplasma sp. in Japan was recently characterized. The aims of the study were to provide molecular evidence for the presence of these 2 species in Japan, and to develop a reliable PCR method based on the nucleotide differences within the citrate synthase (gltA) gene. DNA samples from 182 ixodid ticks (134 Ixodes persulcatus, 35 Haemaphysalis douglasii and 13 I. ovatus) collected from 2 sites in Hokkaido, Japan, were screened for A. phagocytophilum and its closely related Anaplasma sp. (herein designated as Anaplasma sp. Japan) using 16S rRNA PCR, revealing a combined prevalence rate of 27.5% (50 samples). The positive samples were then used to evaluate a newly developed gltA-based nested PCR method. Selected positive samples were further characterized using the groEL gene for confirmation and phylogenetic analyses. Two groups of sequence results were obtained: those that had closer identities with (1) A. phagocytophilum (99.5-99.6% for 16S rRNA, 97.5% for gltA and 98.4% for groEL), and those that had closer identities with (2) Anaplasma sp. closely related to A. phagocytophilum in Japan (99.3% for 16S rRNA, 96.4-98.7% for gltA and 97.5-97.9% for groEL). The present study confirmed the distinct presence of A. phagocytophilum and its closely related Anaplasma sp. in Japan, and developed a new PCR detection method based on gltA that can distinguish the 2 organisms.
Department of Veterinary Clinical Science, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.
Adrian Patalinghug
AP
Ybañez
Kotaro
K
Matsumoto
Toshio
T
Kishimoto
Naoaki
N
Yokoyama
Hisashi
H
Inokuma
D041081:Anaplasma phagocytophilum / Q000235:genetics*; D000818:Animals; D001483:Base Sequence; D002950:Citrate (si)-Synthase / Q000235:genetics*; D016000:Cluster Analysis; D017931:DNA Primers / Q000235:genetics; D014644:Genetic Variation; D026863:Ixodidae / Q000382:microbiology*; D007564:Japan; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000379:methods*; D015995:Prevalence; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012680:Sensitivity and Specificity; D017422:Sequence Analysis, DNA; D013045:Species Specificity
D017931:DNA Primers; D012336:RNA, Ribosomal, 16S; D002950:Citrate (si)-Synthase