Analysis of the medium (M) segment sequence of Guaroa virus and its comparison to other orthobunyaviruses

T Briese, A Rambaut, W I Lipkin

Research output: Contribution to journalArticlepeer-review


Guaroa virus (GROV), a segmented virus in the genus Orthobunya virus, has been linked to the Bunyamwera. serogroup (BUN) through cross-reactivity in complement fixation assays of S segment-encoded nucleocapsid protein determinants, and also to the California serogroup (CAL) through cross-reactivity in neutralization assays of M segment-encoded glycoprotein determinants. Phylogenetic analysis of the S-segment sequence supported a closer relationship to the BUN serogroup, for this segment and it was hypothesized that the serological reaction may indicate genome-segment reassortment. Here, cloning and sequencing of the GROV M segment are reported. Sequence analysis indicates an organization similar to that of other orthobunya viruses, with genes in the order GN-NSm-GC, and mature proteins generated by protease cleavage at one, and by signalase at possibly three, sites. A potential role of motifs that are more similar to CAL than to BUN virus sequences with respect to the serological reaction is discussed. No discernable evidence for reassortment was identified.

Original languageEnglish
Pages (from-to)3071-3077
Number of pages7
JournalJournal of General Virology
Publication statusPublished - Oct 2004


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