Genetic diversity and phylogeography of Seewis virus in the Eurasian common shrew in Finland and Hungary
© Kang et al; licensee BioMed Central Ltd. 2009
Received: 07 September 2009
Accepted: 24 November 2009
Published: 24 November 2009
Recent identification of a newfound hantavirus, designated Seewis virus (SWSV), in the Eurasian common shrew (Sorex araneus), captured in Switzerland, corroborates decades-old reports of hantaviral antigens in this shrew species from Russia. To ascertain the spatial or geographic variation of SWSV, archival liver tissues from 88 Eurasian common shrews, trapped in Finland in 1982 and in Hungary during 1997, 1999 and 2000, were analyzed for hantavirus RNAs by reverse transcription-polymerase chain reaction. SWSV RNAs were detected in 12 of 22 (54.5%) and 13 of 66 (19.7%) Eurasian common shrews from Finland and Hungary, respectively. Phylogenetic analyses of S- and L-segment sequences of SWSV strains, using maximum likelihood and Bayesian methods, revealed geographic-specific genetic variation, similar to the phylogeography of rodent-borne hantaviruses, suggesting long-standing hantavirus-host co-evolutionary adaptation.
A paradigm-altering chapter in hantavirology is unfolding with the discovery of genetically distinct hantaviruses in multiple species of shrews (Order Soricomorpha, Family Soricidae), including the northern short-tailed shrew (Blarina brevicauda) , Chinese mole shrew (Anourosorex squamipes) , masked shrew (Sorex cinereus) , dusky shrew (Sorex monticolus) , Therese's shrew (Crocidura theresae)  and Ussuri white-toothed shrew (Crocidura lasiura) . Also, whole-genome analysis of Thottapalayam virus (TPMV), a hantavirus isolated from the Asian house shrew (Suncus murinus) [6, 7], demonstrates a separate phylogenetic clade, consistent with an early evolutionary divergence from rodent-borne hantaviruses [8, 9]. Moreover, recent identification of hantaviruses in moles (Family Talpidae) further challenges the conventional view that rodents are the primordial reservoir hosts of hantaviruses, and suggests that their evolutionary origins and zoogeographic history are far more ancient and complex than formerly conjectured [10–12].
RT-PCR detection of SWSV RNA in Eurasian common shrews.
Sequence similarities (%) of the partial S and L segments of SWSV mp70 and SWSV strains from Sorex araneus sampled in Finland and Hungary.
An exception was the partial S-segment sequence of SWSV strain DGR18890 from Oulun Lääni, which was highly incongruent, showing marked divergence of nearly 20% at the nucleotide and amino acid levels (Table 2). Analysis, using multiple recombination-detection methods, including GENECONV, Bootscan, Chimaera, 3SEQ, RDP, SiScan, MaxChi and HyPhy Single Recombinant Breakpoint , failed to disclose any evidence of recombination. However, analyses of full-length genomic sequences of SWSV strains would be required to demonstrate intra-lineage recombination events. Apart from the above-mentioned incongruity, the inability to amplify the S segment in six of the 25 L-segment RT-PCR positive tissues, despite repeated attempts using numerous primers, may be the result of low viral titers or inadequate sensitivity of the PCR primers. Intensive efforts are ongoing to resolve this important issue.
Because shrews are inherently difficult to identify by morphological features alone, host verification of SWSV-infected shrews was confirmed by analyzing voucher specimens and sequencing the entire 1,140-base pair cytochrome b gene of mitochondrial DNA (mtDNA), amplified by PCR, using previously described universal primers (5'-CGAAGCTTGATATGAAAAACCATCGTTG-3' and 5'-GCAGCCCCTCAGAATGATATTTGTCCAC-3'). mtDNA sequences were deposited into GenBank (GQ374412-GQ374437), and the identities of the 25 hantavirus-infected hosts were assessed using a Bayesian approach (5 million generation with burn-in of 5000 discarded) that was mid-point rooted (tree not shown). All SWSV-infected shrews were confirmed as Sorex araneus. However, the Eurasian common shrew exhibits significant chromosomal polymorphism throughout its geographic range . Previous studies suggest that several chromosomal races of Eurasian common shrews are present in Finland and Hungary. Whether or not the sub-lineages of SWSV can be traced to potentially distinct evolutionary histories of these races is a matter of conjecture and requires future investigation.
Because the original report of SWSV was based on a single Eurasian common shrew from Switzerland , there has been understandable reluctance in fully accepting this hantavirus-soricid association. Data from the present study, however, provide compelling evidence that this soricine shrew species harbors SWSV across its broad geographic range. As further support, in a separate study, Sorex araneus, as well as the tundra shrew (Sorex tundrensis) and Siberian large-toothed shrew (Sorex daphaenodon), have been shown to harbor genetic variants of SWSV in six widely separated administrative regions of Western and Eastern Siberia . Similarly, the American water shrew (Sorex palustris), Trowbridge's shrew (Sorex trowbridgii) and vagrant shrew (Sorex vagrans) in North America harbor genetic variants of Jemez Springs virus (H.J. Kang and R. Yanagihara, unpublished), which was originally found in the dusky shrew . When viewed within this context, the demonstration of SWSV in Eurasian common shrews from Finland and Hungary lends support to the hypothesis that common ancestral hantaviruses established themselves in ancestors of present-day soricine shrew species, with subsequent cross-species transmission and local host-specific adaptation.
As noted, SWSV RNAs were found in Eurasian common shrews captured in Finland more than 25 years ago. Analysis of hantavirus sequences amplified from tissues of Eurasian common shrews and other soricine shrew species more recently trapped in these same sites in Finland would be extremely valuable, in providing insights into the evolutionary rate of SWSV. Such studies are now underway.
The emerging story of previously unrecognized hantaviruses in soricomorphs has been greatly accelerated by the availability of an extensive, meticulously curated, small-mammal frozen-tissue collection, housed at the Museum of Southwestern Biology. That is, while these tissues were not collected for the purposes of our current and past studies, their ready accessibility has facilitated the rapid acquisition of new knowledge about the spatial distribution of hantaviruses in nonrodent reservoir hosts [2, 3, 12]. As such, these opportunistic studies provide convincing justification and strong testament for the establishment and long-term maintenance of these repositories for future scientific inquiry. Additional hantaviruses and other zoonotic agents are likely to be successfully mined from such banked tissues, by employing powerful microarray and ultra high-throughput sequencing technologies.
Dr. Duane A. Schlitter and Dr. Gabor R. Racz collected the shrew tissues in Finland and Hungary, respectively. Ms. Laarni Sumibcay provided technical assistance. This work was supported in part by U.S. Public Health Service grants R01AI075057 from the National Institute of Allergy and Infectious Diseases, and P20RR018727 (Centers of Biomedical Research Excellence) and G12RR003061 (Research Centers in Minority Institutions) from the National Center for Research Resources, National Institutes of Health.
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