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Anaplasma marginale major surface protein 1a: a marker of strain diversity with implications for control of bovine anaplasmosis. Classification of bacteria is challenging due to the lack of a theory-based framework. In addition, the adaptation of bacteria to ecological niches often results in selection of strains with diverse virulence, pathogenicity and transmission characteristics.
Bacterial strain diversity presents challenges for taxonomic classification, which in turn impacts the ability to develop accurate diagnostics and effective vaccines. Over the past decade, the worldwide diversity of Anaplasma marginale , an economically important tick-borne pathogen of cattle, has become apparent. The extent of A. Notably, the A. Herein, we discuss a molecular taxonomic approach for classification of A.
Taxonomic analysis of this important molecule provides the opportunity to understand A. All rights reserved. Identification of a vertically transmitted strain from Anaplasma marginale UFMG3 : Molecular and phylogenetic characterization, and evaluation of virulence. Bovine anaplasmosis is a disease caused by the intraerythrocytic rickettsia species Anaplasma marginale and results in great economic losses in tropical and subtropical regions.
Vertical transmission is an important phenomenon that contributes to the persistence of different strains of the agent within the same herd. The identification of new strains and genetic characterization studies are essential to understanding their epidemiology and virulence and for vaccine development. The aim of this study was to perform molecular and phylogenetic characterizations of a new vertically transmitted strain from A.
Thirty newborn Holstein calves were subjected to molecular tests for the detection of A. Calves positive for A. Blood samples from one of the calves that presented rickettsemia of This strain was identified as UFMG3. Three tandem repeat forms 13 and MGI19 were identified from the analysis of the msp1a gene, in which the form MGI19 appeared twice.
The calves showed maximum rickettsemia of 5. The results of experimental inoculation suggest that the strain A. Genetic characterization of Anaplasma marginale strains from Tunisia using single and multiple gene typing reveals novel variants with an extensive genetic diversity.
Anaplasma marginale , which is responsible for bovine anaplasmosis in tropical and subtropical regions, is a tick-borne obligatory intraerythrocytic bacterium of cattle and wild ruminants.
In Tunisia, information about the genetic diversity and the phylogeny of A. The purpose of this study is to investigate A. The single gene analysis confirmed the presence of different and novel heterogenic A. The concatenated sequence analysis showed a phylogeographical resolution at the global level and that most of the Tunisian sequence types STs formed a separate cluster from a South African isolate and from all New World isolates and strains.
By combining the characteristics of each single locus with those of the multi-loci scheme, these results provide a more detailed understanding on the diversity and the evolution of Tunisian A.
Anaplasmosis, also known as yellow fever, is an infectious parasitic disease of cattle caused by the protozoan Anaplasma marginale. Anaplasma marginale infects the erythrocytes and causes severe anaemia, weakness, loss of appetite, fever, depression, abortion, decreased milk production, constipation, jaundice and sometimes death.
In Malaysia, data on A. Anaplasmosis in livestock has received little attention in Identification of Anaplasma marginale type IV secretion system effector proteins. Directory of Open Access Journals Sweden. Full Text Available Anaplasma marginale , an obligate intracellular alphaproteobacterium in the order Rickettsiales, is a tick-borne pathogen and the leading cause of anaplasmosis in cattle worldwide. Complete genome sequencing of A. The T4SS is one of seven known types of secretion systems utilized by bacteria, with the type III and IV secretion systems particularly prevalent among pathogenic Gram-negative bacteria.
The T4SS is predicted to play an important role in the invasion and pathogenesis of A. However, T4SS effector proteins have not been identified and tested in the laboratory until now. By combining computational methods with phylogenetic analysis and sequence identity searches, we identified a subset of potential T4SS effectors in A.
Maries and chose six for laboratory testing. The algorithm employed to find T4SS effector proteins in A. The first T4SS effector proteins for A. Anaplasma marginale and Anaplasma phagocytophilum: Rickettsiales pathogens of veterinary and public health significance. Anaplasma marginale and Anaplasma phagocytophilum are the most important tick-borne bacteria of veterinary and public health significance in the family Anaplasmataceae.
The objective of current review is to provide knowledge on ecology and epidemiology of A. Bovine anaplasmosis is globally distributed tick-borne disease of livestock with great economic importance in cattle industry. The infection in domestic animals is generally referred as tick-borne fever. Concurrent infections exist in ticks, domestic and wild animals in same geographic area. All age groups are susceptible, but the prevalence increases with age. Movement of susceptible domestic animals from tick free non-endemic regions to disease endemic regions is the major risk factor of bovine anaplasmosis and tick-borne fever.
Recreational activities or any other high-risk tick exposure habits as well as blood transfusion are important risk factors of human granulocytic anaplasmosis. After infection, individuals remain life-long carriers. Clinical anaplasmosis is usually diagnosed upon examination of stained blood smears. Generally, detection of serum antibodies followed by molecular diagnosis is usually recommended.
There are problems of sensitivity and cross-reactivity with both the Anaplasma species during serological tests. Tetracyclines are the drugs of choice for treatment and elimination of anaplasmosis in animals and humans.
Universal vaccine is not available for either A. Detection and Characterisation of Anaplasma marginale and A. Full Text Available Bovine anaplasmosis is endemic in South Africa and it has a negative economic impact on cattle farming. An improved understanding of Anaplasma marginale and Anaplasma marginale variety centrale A. Direct detection methods currently in use for A.
Of these, qPCR is the most sensitive for detection of A. Serological assays also feature in routine diagnostics, but cross-reactions prevent accurate species identification. Recently, genetic characterisation has confirmed that A. Diversity studies targeting Msp1a repeats for A. Full Text Available The genus Anaplasma Rickettsiales: Anaplasmataceae includes obligate tick-transmitted intracellular organisms, Anaplasma phagocytophilum and Anaplasma marginale that multiply in both vertebrate and tick host cells.
Recently, we showed that A. However, the gene expression profile in A. The objectives of this study were to characterize tick gene expression profile in Ixodes scapularis ticks and cultured ISE6 cells in response to infection with A. The results of these studies demonstrated modulation of tick gene expression by A.
These differences in Anaplasma -tick interactions may reflect differences in pathogen life cycle in the tick cells. Antigenic variation of Anaplasma marginale msp2 occurs by combinatorial gene conversion. The rickettsial pathogen Anaplasma marginale establishes lifelong persistent infection in the mammalian reservoir host, during which time immune escape variants continually arise in part because of variation in the expressed copy of the immunodominant outer membrane protein MSP2.
A key question is how the small 1. The recombination of whole pseudogenes into the single msp2 expression site has been previously identified as one method of generating variants, but is inadequate to generate the number of variants required for persistent infection. In the present study, we demonstrate that recombination of a whole pseudogene is followed by a second level of variation in which small segments of pseudogenes recombine into the expression site by gene conversion.
Evidence for four short sequential changes in the hypervariable region of msp2 coupled with the identification of nine pseudogenes from a single strain of A. Gamma irradiation attenuation of Anaplasma Marginale and its possible use as vaccine against bovine anaplasmosis. Bovine Anaplasmosis is one of the limiting in the cattle development at Colombia and others tropical countries.
Bovine Anaplasmosis is an infectious disease caused by a microorganism called Anaplasma Marginale , it with invades the red globules producing erythrofagocitosis. In this job, were irradiated with different gamma beam intensity; microorganisms of Anaplasma Marginale , those which were used as innocuous.
Animals of the groups I,II,III presented good protection against the disease; animals of the Group IV presented mild symptoms with subsequent recovery and strong symptoms. Las enfermedades infecciosas transmitidas por garrapatas, entre las que incluimos a la Anaplasmosis A. Knockout of an outer membrane protein operon of anaplasma marginale by transposon mutagenesis.
Large amounts of data generated by genomics, transcriptomics and proteomics technologies have increased our understanding of the biology of Anaplasma marginale. However, these data have also led to new assumptions that require testing, ideally through classic genetic mutation. One example is the def Detection of genetic diversity of Anaplasma marginale isolates in Minas Gerais, Brazil. Pohl, A. Prevalence of Anaplasma marginale in different tick species from Ngorongoro Crater, Tanzania.
In , Ngorongoro Crater was infested with high density of ticks on grassland, livestock and wildlife which was also associated with high mortality. Adult ticks were collected, identified, processed for nucleic acids extraction and a molecular analysis was performed to determine the range of tick species harboring Anaplasma marginale.
Six tick species were detected with A. Five of the positive tick species excluding R. High diversity of tick species detected with A. Immune responses in cattle vaccinated with gamma-irradiated Anaplasma marginale. The infectivity and immunogenecity of gamma-irradiated Anaplasma marginale organisms were studied in bovine calves.
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