Molecular identification of Anaplasma marginale in two autochthonous South American wild species revealed an identical new genotype and its phylogenetic relationship with those of bovines
© Guillemi et al. 2016
Received: 8 October 2015
Accepted: 28 April 2016
Published: 26 May 2016
The Erratum to this article has been published in Parasites & Vectors 2016 9:358
Anaplasma marginale is a well-known cattle pathogen of tropical and subtropical world regions. Even though, this obligate intracellular bacterium has been reported in other host species different than bovine, it has never been documented in Myrmecophaga tridactyla (giant anteater) or Hippocamelus antisense (taruca), which are two native endangered species.
Samples from two sick wild animals: a Myrmecophaga tridactyla (blood) and a Hippocamelus antisense (blood and serum) were studied for the presence of A. marginale DNA through msp5 gene fragment amplification. Further characterization was done through MSP1a tandem repeats analysis and MLST scheme and the genetic relationship among previously characterized A. marginale sequences were studied by applying, eBURST algorithm and AMOVA analysis.
Anaplasma marginale DNA was identified in the Myrmecophaga tridactyla and Hippocamelus antisense samples. Through molecular markers, we identified an identical genotype in both animals that was not previously reported in bovine host. The analysis through eBURST and AMOVA revealed no differentiation between the taruca/anteater isolate and the bovine group.
In the present publication we report the identification of A. marginale DNA in a novel ruminant (Hippocamelus antisense) and non-ruminant (Myrmecophaga tridactyla) host species. Genotyping analysis of isolates demonstrated the close relatedness of the new isolate with the circulation population of A. marginale in livestock. Further analysis is needed to understand whether these two hosts contribute to the anaplasmosis epidemiology.
Anaplasma marginale is an obligate intracellular pathogen from the phylum Proteobacteria, class alpha Proteobacteria, order Rickettsiales, and family Anaplasmataceae. Anaplasma marginale is known as an intraerythrocytic pathogen that causes moderate to severe hemolytic anemia, jaundice and hemoglobinuria without hemoglobinemia in cattle , although, other host species different than bovine were reported to be infected by this bacteria. In previous publications, Mazama gouazoubira, Blastocerus dichotomus, Syncerus caffer, Bubalus bubalis, Oryx gazella, Camelus dromedarius, Kobus vardonii and Aepyceros melampus have been described as A. marginale hosts [2–7]. The economic losses generated by anaplasmosis are not only associated with morbidity and mortality in cattle, but also with a lower weight gain rate, lower milk production, abortions and treatment costs. The identification of new hosts, the study of the genotypes associated to wild species and their interactions with genotypes frequently found in livestock could improve the complete understanding of the eco-epidemiology of anaplasmosis, and will be beneficial for surveillance and disease control. In the present study, we describe the identification of A. marginale DNA in two wild species (Myrmecophaga tridactyla and Hippocamelus antisensis) where this pathogen has not been previously reported. After molecular diagnosis of A. marginale by amplifying a fragment of the msp5 gene, both isolates were characterized applying two different molecular markers. Through MSP1a tandem repeats analysis and the A. marginale MLST scheme we were able to characterize the genotypes and study their geographical distribution. Results suggest that A. marginale could be circulating in Myrmecophaga tridactyla and Hippocamelus antisensis and that there seems to be directionality in the transmission of certain genotypes from cattle to these wild species.
In both cases, samples were collected for routine diagnostic purposes following institutional guidelines. Capture and transit permits (Reference numbers: 1140 and 000336) were obtained from the provincial government through Natural Resources Agency of Corrientes and Tucuman, respectively.
Samples and genomic DNA isolation
Blood samples from the taruca and the giant anteater (one per animal) and a serum sample from the taruca were received and analyzed in our laboratory for A. marginale identification. The genomic DNA extraction from blood and serum samples was performed by phenol/chloroform method and a standard ethanol precipitation .
PCR assays for A. marginale
Primers employed for A. marginale identification and characterization
Amplicon size (bp)
major surface protein MSP5
F: 5' GCATAGCCTCCCCCTCTTTC 3'
R: 5' TCCTCGCCTTGCCCCTCAGA 3'
F: 5' TACACGTGCCCTACCGACTTA 3'
R: 5' TCCTCGCCTTGCCCCTCAGA 3'
major surface protein MSP1a
F: 5'GCATTACAACGCAACGCTTGAG 3'
84–87 bp tandem repeats
R: 5'GCTTTACGCCGCCGCCTGCGCC 3'
Chromosomal replication initiation protein
F: 5' GTTCATAAGCGGGAAGGACA 3'
R: 5' CTTGTCTCGGTCTGGCTAGG 3'
Cell division protein FtsZ
F: 5' CCTGACCACCAATCCGTATC 3'
R: 5' CCCGTATGAAGCACCGTATC 3'
F: 5' AGCATAAAGCCCGAGGAACCTT 3'
R: 5' GCCGAGCATGTCCTTCCTTCTG 3'
F: 5' TGTGGATAGGGACGACCTTC 3'
R: 5' AAAGTCATCCTCAGCGTGGT 3'
F: 5' GGGCGGTAACTGTGCTTTTA 3'
R: 5' ACGCCCATGTCGACTATCTC 3'
Preprotein translocase subunit SecY
F: 5' TTCACGCTGCTAGCCCTAAT 3'
R: 5' TACGAGGGAAATGCCGTTAC 3'
Dihydrolipoamide acetyltransferase component
F: 5' GAGATAGCATCTCCGGTTGC 3'
R: 5' CTCCCCTGGCCTTTTTACTC 3'
Molecular markers analysis
Multiple alignments of the msp1α sequences obtained for the taruca and the anteater isolates were performed using the Clustal W2 software (EMBL-EBI, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire, UK). After the alignment, nucleotide sequences were translated to amino acid sequences in order to identify the tandem repeats. The repeat patterns were compared to those previously published [12, 13].
For automate MLST-DNA sequence editing and analysis, a custom-designed bioinformatic “Galaxy MLST-Pipeline” has been employed (http://bioinformatica.inta.gov.ar/galaxy/) . The information obtained from this pipeline was then used for inferring relatedness between allelic profiles through the eBURST algorithm . The sequence type (ST) from 74 A. marginale strains was retrieved from the MLST-Pipeline database (MLST-DB) (http://bioinformatica.inta.gov.ar/mlst/) for the study of the genotype diversity and distribution of the new isolates. This database includes information relating to strains from cattle of diverse geographic origins (USA, Puerto Rico, Italy, South Africa, Mexico, Colombia, Cuba, Brazil, Argentina and Uruguay). Applying the PHYLOViZ program , a triple locus variant (TLV) criteria was employed for the clonal complexes (CC) construction, meaning that those related genotypes that differ in up to three genes from the founder genotype will be arranged in the same CC. Also the full MLST was run; this option links all STs through the construction of a Minimum Spanning Tree and specifying the number of alleles that are different between each pair of STs. Also, the Arlequin 3.1 program  was employed to assess how much of the total genetic variation (measured by ST) was partitioned between the isolates through AMOVA ).
Diagnosis and genotyping of A. marginale
Amino acid sequence for MSP1a tandem repeats found for the taruca and the giant anteater A. marginale isolates
Number of repeats found
Alleles found for each gene and the resulting MLST scheme ST
Genetic relationship among isolates
The comprehensive study of the anaplasmosis epidemiology needs the identification of all the involved factors, including susceptible, carrier and potential reservoir hosts. Herein, the evidence of A. marginale presence in the taruca and the giant anteater samples was supported not only by smear examination but remarkably by the PCR amplification of nine different gene sequences: one gene fragment currently used for diagnosis (msp5) and eight for molecular typing (msp1a and the seven neutral fragments from MLST scheme). Notably, the genotyping data revealed the presence of the same A. marginale isolate in both wild species.
Relevant information that arises from the results obtained here is the presence of A. marginale DNA in the taruca serum sample. Although serum samples are not ideally suited for genomic DNA extraction, especially from intraerythrocytic agents, we could manage to obtain a sufficient amount of A. marginale DNA for PCR detection. This fact probably has to do with the presence of the dense (infective) forms of A. marginale, which are able to survive outside the erythrocyte before parasitizing another cell . The presence of A. marginale DNA in the taruca serum is an important fact since this sample was obtained two years before the blood sample, when the cervid was in its original location in Jujuy province, indicating that the taruca was already infected when moved to Horco Molle in Tucuman province.
Even though A. marginale is the most prevalent tick-borne disease in livestock worldwide and studies of its impact are mainly focused in domestic cattle. , this bacteria has also been detected in blood from other wild mammalian ruminant species such as Mazama gouazoubira, Blastocerus dichotomus, Syncerus caffer, Bubalus bubalis, Oryx gazella, Camelus dromedarius, Kobus vardonii and Aepyceros melampus [2–7, 18]. To date, there are no reports describing the presence of A. marginale in a taruca (Hippocamelus antisensis) and/or giant anteater (Myrmecophaga tridactyla), two native endangered species. Moreover, the finding in the giant anteater is the first demonstration of A. marginale in a non-ruminant species. Other Anaplasma species, A. phagocytophilum, has been found in a great diversity of hosts including human. This species has been considered a generalist pathogen with highly adaptive strategies that enables this bacterium to infect a wide range of hosts . Recently, employing the groEL gene as a molecular marker Jahfari et al.  could discriminate four different A. phagocytophilum ecotypes with significantly different host ranges and zoonotic potential; these findings suggest that certain genotypes may be adapted to specific host species. It is likely that, this ‘wide host adaptation’ ability may be a common feature to other Anaplasma species, and this could explain why A. marginale is found in other host species different than cattle.
In Argentina the enzootic area for A. marginale, extends from the northern boundary of the country to the parallel 33 ° S. The main vector implicated in anaplasmosis transmission is Rhipicephalus microplus, an Ixodidae tick distributed through the north of the country. While not in anteater, there are reports of R. microplus parasitizing various cervid species [20, 21]. Also, other tick genus has been implicated as A. marginale vectors . In this sense, Amblyomma cajennense, could be a potential A. marginale vector  and was previously reported parasitizing cattle [21, 24], giant anteater [24–26] and cervids [20, 21], highlighting the importance of following up its role as a source of infection of A. marginale for domestic and wild species. Moreover, A. cajennense is well distributed through Jujuy, Tucuman and Santiago del Estero province in Argentina . In addition to ticks, other hematophagous insects could cause mechanical transmission of A. marginale . In fact, Tabanus spp. is well distributed over South America and may act as a mechanical vector between cattle and new hosts species. In the two cases reported in this study, no ticks or other hematophagous arthropod were found parasitizing the taruca nor the giant anteater neither arriving at rescue centers or during their stay there.
Additionally we provide information regarding epidemiological analysis through genotyping of both isolates and comparing them with cattle genotypes reported to date. In this sense, the ST 69 found in both wild species resulted in a new variant consisting of seven alleles previously described in cattle from Argentina and other world regions . Similarly, the two tandem repeats found through the MSP1a marker (repeat 13 and 27) were previously published for A. marginale isolates in cattle from Argentina, Mexico, Brazil and South Africa , but, as they had never been found together, their combination resulted in a novel genotype.
As we have previously reported , there is a broad genetic diversity of A. marginale isolates in bovine host. Moreover, the chance of finding the same genotype in cattle samples is scarce (Fig. 5 and ). Identical isolates have only been detected in samples collected in the same herd at the same time point (ST 26, 29 and 43). However, taken together, the information obtained from the msp1α genotype, the eBURST and AMOVA analysis highlights that, although different, the newly emerged genotype found in wild species is not separated from the rest of genotypes found in bovines. This finding might suggest that transmission of the new A. marginale isolate from cattle to accidental hosts could have arisen by means of a better transmission vector-competent isolate or by the emergence of a favored variant with an improved fitness for wider hosts. Further evidence is needed to support this hypothesis, mainly through the characterization of other A. marginale isolates from a greater number of wild host species.
To our knowledge, this is the first demonstration of A. marginale DNA in a taruca and a giant anteater. Moreover, for the taruca, A. marginale was detected over time, since the bacterium DNA was present in a serum sample and in a blood sample collected two years after.
Since the anteater and the taruca sustained other pathogens simultaneously, we are unable to affirm that A. marginale has infected or was the cause of death of the animals. Even though DNA from A. marginale has been detected from both taruca and anteater blood samples, whether these two hosts species contribute to the anaplasmosis epidemiology needs further investigation.
Our study demonstrated the presence of A. marginale DNA in two up to now non-acknowledged host species: Hippocamelus antisense and Myrmecophaga tridactyla. Moreover, this is the first report of A. marginale in a non-ruminant host. The sequence analysis of the molecular markers revealed that the same genotype was present in both the cervid and the anteater, and further analysis demonstrated the close relatedness of the new isolate with the circulation population of A. marginale in livestock. On one hand, these results could be an evidence of anaplasmosis as a threat for wild life and additionally could represent a sign of alternative mammalian reservoir for A. marginale. The acceptance of this hypothesis is worth an epidemiological base search and analysis.
We thank Dr. Verónica Lia for valuable suggestions.
This work was financed by grants from the Argentine Ministry of Science and Technology (PICT 0932) and INTA PNBIO (1131043 and 1131032). Salaries were provided by CONICET (ECG, LLA., SW and MF).
ECG carried out part of the molecular genetic studies, ran the eBURST analysis and drafted the manuscript. SF carried out part of the molecular genetic studies and helped to draft the manuscript. MO participated in the design of the study and revised the manuscript critically. JPM carried out the giant anteater sampling and drafted the part of the manuscript referred to it clinical case. EC carried out the taruca sampling and drafted the part of the manuscript referred to it clinical case. JF participated in the sequence alignments. LLA carried out the protein sequence alignment and its analysis. MP carried out the nucleotide sequence alignment and its analysis. CB participated in the eBURST run and in the analysis of it results. VP carried out part of the PCR amplifications. SEW participated in the design of the study and revised the manuscript critically. MDF conceived of the study and gave the final approval of the version to be published. All authors read and approved the final version of the manuscript.
The authors declare that they have no competing interests.
Ethics approval and consent to participate
In both cases, samples were sent to the laboratory for routine diagnostic purposes following institutional guidelines. Capture and transit permits (Reference numbers: 1140 and 000336) were obtained from the provincial government through Natural Resources Agency of Corrientes and Tucuman, respectively.
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