Publications (18)40 Total impact
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Article: Molecular survey of hard ticks in endemic areas of tick-borne diseases in China.
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ABSTRACT: Over the past several years, there was a substantial increase in the number of cases of known and novel tick-borne infections in humans in China. To better understand the ticks associated with these infections, we collected hard ticks from animals or around livestock shelters in 29 localities in 5 provinces (Beijing, Henan, Hubei, Inner Mongolia, and Zhejiang) where cases of tick-borne illness were reported. We collected 2950 hard ticks representing 7 species of 4 genera (Dermacentor sinicus, Haemaphysalis flava, Haemaphysalis longicornis, Ixodes granulatus, Ixodes persulcatus, Rhipicephalus microplus, and Rhipicephalus sanguineus). These ticks were identified to species using morphological characters initially. We then sequenced the mitochondrial small subunit rRNA (12S rRNA) gene, cytochrome oxidase subunit 1 (COI) gene, and the second internal transcribed spacer (ITS2) gene of these ticks, and conducted phylogenetic analyses. Our analyses showed that the molecular and morphological data are consistent in the identification of the 7 tick species. Furthermore, all these 7 tick species from China were genetically closely related to the same species or related species found outside China. Rapid and accurate identification and long-term monitoring of these ticks will be of significance to the prevention and control of tick-borne diseases in China.Ticks and Tick-borne Diseases 03/2013; -
Article: Phylogeny and origins of hantaviruses harbored by bats, insectivores, and rodents.
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ABSTRACT: Hantaviruses are among the most important zoonotic pathogens of humans and the subject of heightened global attention. Despite the importance of hantaviruses for public health, there is no consensus on their evolutionary history and especially the frequency of virus-host co-divergence versus cross-species virus transmission. Documenting the extent of hantavirus biodiversity, and particularly their range of mammalian hosts, is critical to resolving this issue. Here, we describe four novel hantaviruses (Huangpi virus, Lianghe virus, Longquan virus, and Yakeshi virus) sampled from bats and shrews in China, and which are distinct from other known hantaviruses. Huangpi virus was found in Pipistrellus abramus, Lianghe virus in Anourosorex squamipes, Longquan virus in Rhinolophus affinis, Rhinolophus sinicus, and Rhinolophus monoceros, and Yakeshi virus in Sorex isodon, respectively. A phylogenetic analysis of the available diversity of hantaviruses reveals the existence of four phylogroups that infect a range of mammalian hosts, as well as the occurrence of ancient reassortment events between the phylogroups. Notably, the phylogenetic histories of the viruses are not always congruent with those of their hosts, suggesting that cross-species transmission has played a major role during hantavirus evolution and at all taxonomic levels, although we also noted some evidence for virus-host co-divergence. Our phylogenetic analysis also suggests that hantaviruses might have first appeared in Chiroptera (bats) or Soricomorpha (moles and shrews), before emerging in rodent species. Overall, these data indicate that bats are likely to be important natural reservoir hosts of hantaviruses.PLoS Pathogens 02/2013; 9(2):e1003159. · 9.13 Impact Factor -
Article: [Genetic characteristics of hantaviruses carried by Microtus maximowixzii in Yakeshi of Inner Mongolia, China].
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ABSTRACT: To analyze the viral genetic characteristics of hantaviruses carried by Microtus maximowixzii in Yakeshi of Inner Mongolia Autonomous Region and its relationship with Hantaan virus (HTNV) and Seoul virus (SEOV) viruses as well as to identify the natural host of Khabarovsk virus (KHAV). HV specific RNAs were detected by RT-PCR. Complete S and M segment were amplified from the RNA-positive samples. Phylogenetic analysis were performed to estimate the genetic characterization and the relationship with other hantaviruses. Fifty two Microtus maximowixzii voles were captured in Yakeshi areas. Of those voles, hanta-viral RNA was tested positive in 5 samples (9.62%). Complete S and M segments sequences were obtained from 5 and 2 lung samples, respectively. The complete S segment was consisted of 1848 to 1861 bp, and the M segment consisted of 3662 bp. These viruses were closely related to each other with 92.5% - 96.4% for the S segment sequences and 88.9% - 95.4% for the M segment sequences. They shared a higher identity with KHAV found previously in Yakeshi and KHAV of Russia. However, they were obviously different from the other hantavirus species. The 5 strains had the consistent secondary structure of nucleocapsid protein (NP) and glycoprotein (GP). When further comparing their secondary structures with those of HTNV and SEOV, our results indicated that there were no obvious differences in NP between KHAV and both HNTV, SEOV but with obvious difference in GP. Based on the S and M segment sequences, phylogenetic analyses revealed that these 5 strains clustered together with KHAV and formed a distinct lineage. Furthermore, all known KHAV strains could be divided into two small branches with a nucleotide divergence more than 5.3%. Our research data revealed that KHAV was highly endemic among Microtus maximowixzii in Yakeshi area which supported the notion that Microtus maximowixzii had been the natural host of KHAV in the area.Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi 08/2012; 33(8):832-5. -
Article: New 2, 6-modified Bodipy sensitizers for dye-sensitized solar cells.
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ABSTRACT: Three novel 2,6-modified Bodipy sensitizers were synthesized and evaluated for their use in dye-sensitized solar cells (DSSCs). Among them, dye B3, which carries a n-pentyl group at position 8, exhibits the best solar energy conversion efficiency (1.83 %). The results of this study provide a new strategy for the design of Bodipy derivatives as sensitizers for DSSCs.Chemistry - An Asian Journal 01/2012; 7(4):696-700. · 4.50 Impact Factor -
Article: The Bone-Protective Effect of Genistein in the Animal Model of Bilateral Ovariectomy: Roles of Phytoestrogens and PTH/PTHR1 Against Post-Menopausal Osteoporosis.
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ABSTRACT: Genistein, a major phytoestrogen of soy, is considered a potential drug for the prevention and treatment of post-menopausal osteoporosis. Mounting evidence suggested a positive correlation between genistein consumption and bone health both in vivo and in vitro. Earlier studies have revealed that genistein acted as a natural estrogen analogue which activated estrogen receptor and exerted anti-osteoporotic effect. However, it remains unclear whether PTH, the most crucial hormone that regulates mineral homeostasis, participates in the process of genistein-mediated bone protection. In the present study, we compared the therapeutic effects between genistein and nilestriol and investigated whether PTH and its specific receptor PTHR1 altered in response to genistein-containing diet in the animal model of ovariectomy. Our results showed that genistein administration significantly improved femoral mechanical properties and alleviates femoral turnover. Genistein at all doses (4.5 mg/kg, 9.0 mg/kg and 18.0 mg/kg per day, respectively) exerted improved bending strength and b-ALP limiting effects than nilestriol in the present study. However, genistein administration did not exert superior effects on bone protection than nilestriol. We also observed circulating PTH restoration in ovariectomized rats receiving genistein at the dose of 18 mg/kg per day. Meanwhile, PTHR1 abnormalities were attenuated in the presence of genistein as confirmed by RT-PCR, Western blot and immunohistochemistry. These findings strongly support the idea that besides serving as an estrogen, genistein could interact with PTH/PTHR1, causing a superior mineral restoring effect than nilestriol on certain circumstance. In conclusion, our study reported for the first time that the anti-osteoporotic effect of genistein is partly PTH/PTHR1-dependent. Genistein might be a potential option in the prevention and treatment of post-menopausal osteoporosis with good tolerance, more clinical benefits and few undesirable side effects.International Journal of Molecular Sciences 01/2012; 13(1):56-70. · 2.60 Impact Factor -
Article: The ecology, genetic diversity, and phylogeny of Huaiyangshan virus in China.
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ABSTRACT: Surveys were carried out to better understand the tick vector ecology and genetic diversity of Huaiyangshan virus (HYSV) in both regions of endemicity and regions of nonendemicity. Haemaphysalis longicornis ticks were dominant in regions of endemicity, while Rhipicephalus microplus is more abundant in regions of nonendemicity. HYSV RNA was found in human and both tick species, with greater prevalence in H. longicornis and lesser prevalence in R. microplus. Phylogenetic analyses indicate that HYSV is a novel species of the genus Phlebovirus.Journal of Virology 12/2011; 86(5):2864-8. · 5.40 Impact Factor -
Article: Genetic diversity of Borrelia burgdorferi sensu lato isolates from Northeastern China.
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ABSTRACT: Thirty-two strains of Borrelia burgdorferi sensu lato were isolated from Ixodes persulcatus ticks collected from northeastern China from May to June in 2004 and 2005. Restriction fragment length polymorphism (RFLP) analysis and sequence analysis of 5S-23S rRNA intergenic spacer revealed that 29 (90.6%) belonged to Borrelia garinii, demonstrating B, C, and a unique pattern. The remaining three isolates (9.4%) were Borrelia afzelii with pattern D. The phylogenetic analysis based on 5S-23S rRNA intergenic spacer showed that B. garinii and B. afzelii genospecies clustered into two separate lineages. B. garinii strains were classified into three different branches: All the strains with RFLP pattern C were in the same branch, strain VH10 with a unique RFLP pattern clustered with strains VH9 and MDH2 with pattern B, and the rest of the strains with pattern B constitute another branch. These findings demonstrate the genetic diversity of B. burgdorferi sensu lato isolates from northeastern China.Vector borne and zoonotic diseases (Larchmont, N.Y.) 07/2011; 11(7):877-82. · 2.61 Impact Factor -
Article: [Identification of Haemaphysalis longicornis and Rhipicephalus microplus].
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ABSTRACT: To establish a method combined morphology and molecular marker for identifying Haemaphysalis longicornis and Rhipicephalus microplus. Ticks were collected from domestic animals and wild environment in epidemic area of Hubei and Henan provinces where cases of fever with thrombocytopenia syndrome were prevalent. We classified the ticks by morphology characteristics before 12S rDNA of ticks were amplified by PCR and subsequently sequenced. Phylogenetic tree was constructed by PAUP4.0. The ticks belonged to Haemaphysalis longicornis and Rhipicephalus microplus through observation and analysed by the morphological characteristics of the ticks. 12S rDNA was cloned and sequenced while data confirmed the morphological identification of the results. The method based on morphology that combined with molecular marker seemed a good method for the identificaton of ticks.Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi 06/2011; 32(6):608-12. -
Article: DNA-methylation changes induced by salt stress in wheat Triticum aestivum
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ABSTRACT: The present study was to assess DNA methylation alteration induced by salt stress in two wheat Triticum aestivum cultivars differing in salt tolerance (salt-tolerant Dekang-961 and sensitive Lumai-15), comparatively. The changes in the status of methylation of the CCGG sequence of the nuclear genome of the root DNA of plants exposed to different concentrations of NaCl compared with that of untreated plants were determined by methylation-sensitive amplified polymorphism (MSAP) approach. The result showed that CCGG sequences of Dekang-961 control plants were more methylated than that of Lumai-15. NaCl treatment induced some CCGG sites demethylation and some hypermethylation both in Dekang-961 and Lumai-15, with the net result being genome-wide hypomethylation. These results showed a clear alteration of DNA methylation in plants as a response to salt stress and the effect was dose-dependent. These changes may suggest a mechanism for plants adaptation under salt stress.AFRICAN JOURNAL OF BIOTECHNOLOGY 12/2009; 8:6201-6207. · 0.57 Impact Factor -
Article: Hantaviruses in rodents and humans, Inner Mongolia Autonomous Region, China.
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ABSTRACT: Surveys were carried out in 2003-2006 to better understand the epidemiology of hantaviruses in the Inner Mongolia Autonomous Region of China (Inner Mongolia). Hemorrhagic fever with renal syndrome (HFRS) was first reported in this region in 1955 and has been an important public health problem here since then. During 1955-2006, 8,309 persons with HFRS were reported in Inner Mongolia (average incidence rate 0.89/100,000), and 261 (3.14%) died. Before the 1990s, all HFRS cases occurred in northeastern Inner Mongolia. Subsequently, HFRS cases were registered in central (1995) and western (1999) Inner Mongolia. In this study, hantaviral antigens were identified in striped field mice (Apodemus agrarius) from northeastern Inner Mongolia and in Norway rats (Rattus norvegicus) from middle and western Inner Mongolia. Phylogenetic analysis of hantaviral genome sequences suggests that HFRS has been caused mainly by Hantaan virus in northeastern Inner Mongolia and by Seoul virus in central and western Inner Mongolia.Emerging Infectious Diseases 07/2009; 15(6):885-91. · 6.79 Impact Factor -
Article: Isolation and genetic characterization of hantaviruses carried by Microtus voles in China.
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ABSTRACT: To gain more insights into hantavirus distribution in China, Microtus fortis were caught in Jilin province and M. maximowiczii in the Inner Mongolia Autonomous Region. Hantavirus specific RNA was detected by RT-PCR in 3 out of 26 M. fortis and 5 out of 64 M. maximowiczii. Two hantaviruses (Fusong-Mf-682 and Yakeshi-Mm-59) were isolated successfully in cell culture and their S and M segment nucleotide sequences were determined. Phylogenetic analysis of the S and M segment sequences revealed that the Mf-originated strains from Fusong were closely related to Vladivostok hantavirus (VLAV) with 99% nucleotide identity, but differed from the Yakeshi-Mm strains, with an amino acid divergence of more than 8.8% for the N protein and 11.8% for the GnGc proteins. Yakeshi-Mm strains were closely related to the Khabarovsk hantavirus (KHAV) isolated earlier from M. fortis in Khabarovsk, with an amino acid sequence identity of more than 98.4% for the S segment and 95.6% for the M segment. On phylogenetic trees, Yakeshi-Mm strains clustered together with KHAV and Topografov virus (TOPV) carried by Lemmus sibiricus. The results suggest that the hantavirus carried by M. fortis in China belongs to VLAV type and should be considered as a distinct hantavirus species. They also suggest that M. fortis is the natural host of VLAV (including Fusong-Mf strains), whereas M. maximowiczii is the natural host of KHAV including Yakeshi-Mm strains. Thus, in addition to Hantaan, Seoul, Dabieshan and Puumala-like Hokkaido viruses, at least two other hantaviruses, namely KHAV and VLAV, are circulating in China.Journal of Medical Virology 05/2008; 80(4):680-8. · 2.82 Impact Factor -
Article: [Study on the epidemiological characteristics of hemorrhagic fever with renal syndrome in Inner Mongolia].
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ABSTRACT: In order to better understand the epidemiological features of Hantviruses in Inner Mongolia. Epidemiological surveillance data during the period of the past 52 years were analyzed. An epidemiological survey was carried out in the main epidemic areas in 2005. A total of 8310 hemorrhagic fever with renal syndrome (HFRS) cases were reported in Inner Mongolia from 1955 to 2006, and distributed in 61 counties. HFRS cases were mainly distributed in the east part of Inner Mongolia before 1990. However, HFRS cases had occurred in the middle and western parts since 1990. Hulunbeier prefecture, from the eastern part of Inner Mongolia, had been the most severe area being hit by HERS since the first outbreak in 1955, with 7369 cases reported over the past 52 years, and accounted for 88.68% of the total cases in the whole autonomous region. Although no HFRS cases had been reported before 1999 in Bayannaoer which located in the western part of Inner Mongolia, a total of 95 cases were reported in 2005. Hantavirus antigens had been detected in 11 species of rodents so far,including Apodemus agrarius, Rattus norvegicus, Mus Musculus, Cricetulus barabensis, meriones meridianus, Microtus maximowiczii , Clethrionomys rutilus, Apodemus peninsulae, Phodopus roborvskii, Dipus sagitta and Allactaga sibirica. Results suggested that the epidemics might remain at a relatively high level in the years to come in Inner Mongolia. Furthermore, there might be other types of Hantaviruses in addition to the already identified Seoul viral type in this area.Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi 12/2007; 28(11):1101-4. -
Article: [Comparative analysis of rDNA distribution in metaphase chromosomes of Cucurbitaceae species].
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ABSTRACT: Fluorescence in situ hybridization (FISH) and double FISH experiments were carried out to ascertain the chromosomal distribution patterns of the 45S and 5S ribosomal DNAs in the three species of Cucurbitaceae. Five pairs of 45S rDNA loci and two pairs of 5S rDNA signals were detected on chromosomes of Cucurbita moschata Duch. Luffa cylindrical Roem. contained five pairs of 45S rDNA loci and one pair of 5S rDNA loci. In Benincasa hispida Cogn., two pairs of 45S rDNA sites and one pair of 5S rDNA site were detected. In this species, 5S rDNA and one pair of the 45S loci were collocated closely in chromosome 7S. 45S rDNA chromosomal distribution patterns were highly conserved among the three species, althoufh their number varied markedly. The 5S rDNA sites on chromosomes among the three species were highly polymorphic. We further discussed differentially evolutionary processes of 45S and 5S rDNA in plant genomes.Hereditas (Beijing) 06/2007; 29(5):614-20. -
Article: [Investigation on Anaplasma phagocytophilum infection in rodents from forest areas in northeastern China].
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ABSTRACT: To investigate the prevalence of Anaplasma phagocytophilum in rodents from forest areas in northeastern China. PCR amplification, followed by sequence analysis was carried out. The sequences of 16S rRNA and gltA gene fragment amplified from rodent specimens were compared with corresponding part of the sequences deposited in GenBank. A total number of 276 rodents were tested, including 102 in Jilin province, 61 in Helongjiang province and 113 in Inner Mongolia autonomous region. The positive rates were 8.82%, 1.64% and 0.00%, respectively. The infection rate in rodents infected by ticks was 11.30 times higher than that in rodents without ticks (P = 0.002). The S. A. phagocytophilum 16S rRNA sequences from rodents in Jilin and Heilongjiang were identical and differed in 3-5 bases compared with the corresponding parts of A. phagocytophilum from America, Sweden and Japan. Compared with the sequences registered in GenBank, the nucleotide sequence of gltA varied from 87%-97% and its deduced amino acid sequence changed from 84%-99%. A. phagocytophilum infection was presented in rodents from Jilin and Heilongjiang province.Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi 03/2007; 28(2):157-9. -
Article: [Investigation on Borrelia burgdorferi sensu lato in ticks and rodents collected in Da Xing-An Mountains Forest areas of China].
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ABSTRACT: To detect and study the types of Borrelia burgdorferi sensu lato in ticks and rodents from Da Xing-An Mountains Forest areas of China. Nested PCR was performed to amplify 5S-23S rRNA intergenic spacer of B. burgdorferi. Positive products were analysed by restriction fragment length polymorphism (RFLP) and single strand conformation polymorphism (SSCP), specimens showing unique RFLP profile were sequenced and analysed. 1336 Ixodes persulcatus, 144 Dermacento silvarum, 144 Haemaphysalis concinna and 145 rodents of 9 species were collected from 16 sections of Da Xing-An Mountains Forest areas of China. Specific fragments were amplified from 293 I. persulcatus and 6 D. silvarum and 5 rodents of 4 species. B. burgdorferi was not detected in H. concinna. Among the positively tested I. persulcatus, 209 contained B. garinii genospecies and 45 contained B.afzelii genospecies based on RFLP. Moreover, B.garinii genospecies consisted of B. garinii 20047 and B. garinii NT29. 17 adult I. persulcatus were simultaneously infected with B. garinii 20047 and B. garinii NT29. Nine adult I. persulcatus were simultaneously infected with B. garinii 20047 and B. afzelii. Four adult I. persulcatus were simultaneously infected with B. garinii 20047 and B. garinii NT29 and B. afzelii. Two D. silvarum were infected with B. garinii 20047, 1 D. silvarum with B. garinii 20047, 2 D. silvarum with B. afzelii. 3 rodents were infected with B. garinii 20047 while 2 rodents were infected with B. garinii NT29. Mixed infection was not found in D. silvarum and rodents. In addition, nine I. persulcatus and one D. silvarum specimens showed unique RFLP pattern. Data from sequential analysis showed that they all belonged to B. garinii. PCR-SSCP profiles of 5S-23S rRNA intergenic spacer of B. burgdorferi in the positive specimens exceeded 36 types; B. garinii 20047 showed 16 types while B. garinii NT29 showing 11 types, B. afzelii showing 9 types. SSCP profiles of the specimens coinfected with multiple B. burgdorferi was relatively complex. The infection of B. burgdorferi was found in the ticks and rodents in Da Xing-An Mountains Forests areas. The infection rate of I. persulcatus was high. B. garinii was predominant genospecies, and the population of B. burgdorferi was heterogeneous in the area. Mixed infections of different B. burgdorferi genospecies in ticks were found. I. persulcatus and Clethrionomys rufocanus were possibly served as major vector and major host for B. burgdorferi, respectively, suggesting that further study is needed to confirm the coinfection in humans and animals in this region.Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi 09/2006; 27(8):681-4. -
Article: Genomic Evolution of Brassica Allopolyploids Revealed by ISSR Marker
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ABSTRACT: Polyploidization has been viewed as a highly dynamic process and a major force in the evolution of higher plants, including many important crops. To better understand the genomic evolution of Brassica polyploids, we used the Brassica triangle, including three allopolyploids and three diploids, to study genomic evolution after the formation of polyploids. Based on the inter-simple sequence repeat (ISSR) analysis, the different degree of A, B or C genomic modifications were observed in the three Brassica allopolyploids. In B-contained allopolyploids, B genome always altered less than the other genome (A or C), showing that B genome was relatively conserved in the evolution of Brassica allopolyploids. ISSR data supported that a higher degree of ancestral genomic divergence gave rise to a greater frequency of genomic change of polyploids. The possible mechanisms for the genomic changes and the reason for the relatively conserved B genome were discussed.Genetic Resources and Crop Evolution 04/2006; 53(3):603-611. · 1.55 Impact Factor -
Article: Seed coat microsculpturing changes during seed development in diploid and amphidiploid Brassica species.
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ABSTRACT: Seed coat morphology is known to be an excellent character for taxonomic and evolutionary studies, thus understanding its structure and development has been an important goal for biologists. This research aimed to identify the developmental differences of seed coats between amphidiploids and their putative parents in Brassica. Scanning electron microscope (SEM) studies were carried out on six species (12 accessions), three amphidiploids and their three diploid parents. Twelve types of basic ornamentation patterns were recognized during the whole developmental process of the seed coat. Six types of seed coat patterns appeared in three accessions of Brassica rapa, five types in B. oleracea, B. nigra and B. carinata, seven types in B. napus, and eight types in B. juncea. There was less difference among seed coat patterns of the three accessions of B. rapa. The reticulate and blister types were two of the most common patterns during the development of seeds in the six species, the blister-pimple and the pimple-foveate patterns were characteristic of B. rapa, and the ruminate of B. oleracea and B. nigra. The development of seed coat pattern in amphidiploids varied complicatedly. Some accessions showed intermediate patterns between the two putative parents, while others resembled only one of the two parents. The variation in the patterns of seed coat development could be used to provide a new and more effective way to analyse the close relationship among amphidiploids and their ancestral parents.Annals of Botany 06/2004; 93(5):555-66. · 4.03 Impact Factor -
Article: [ISSR markers and their applications in plant genetics].
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ABSTRACT: Recently, inter-simple sequence repeat (ISSR) markers have emerged as an alternative system with reliability and advantages of microsatellites (SSR). The technique involves amplification of genomic segments flanked by inversely oriented and closely spaced microsatellite sequences by a single primer or a pair of primers based on SSRs anchored 5' or 3' with 1-4 purine or pyramidine residues. The sequences of repeats and anchor nucleates are arbitrarily selected. Coupled with the separation of amplification products on a polyacrylamide or agarose gels,ISSR amplification can reveal a much larger number of fragments per primer than RAPD. It is concluded that ISSR technique provides a quick, reliable and highly informative system for DNA fingerprinting.ISSR markers are inherited in Mendelin mode and segregated as dominant markers. This technique has been widely used in the studies of cultivar identification, genetic mapping, gene tagging,genetic diversity, evolution and molecular ecology.Hereditas (Beijing) 10/2002; 24(5):613-6.
Top co-authors
Top Journals
Institutions
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2007–2013
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Beijing Centers for Disease Control and Prevention
Beijing, Beijing Shi, China
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2012
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University of Science and Technology of China
- Department of Chemistry
Hefei, Anhui Sheng, China -
shihezi university
Shihezi, Xinjiang Uygur Zizhiqu, China
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2006–2011
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Beijing Institute of Microbiology and Epidemiology
Beijing, Beijing Shi, China
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2002–2009
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Wuhan University
- College of Life Sciences
Wuhan, Hubei, China
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2008
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Chinese Center For Disease Control And Prevention
Beijing, Beijing Shi, China
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