RESUMO
BACKGROUND: Merkel cell polyomavirus (MCPyV), a newly described oncogenic virus, has been found in association with tumours other than Merkel cell carcinoma (MCC). As yet, little is known about the involvement or influence of MCPyV on the development of these tumours and its prevalence in various populations. AIM: To assess the prevalence of MCPyV DNA in cases of nonmelanoma skin cancer (NMSC). METHODS: The prevalence of MCPyV DNA was assessed in 96 cases of NMSC in a Brazilian population comprising 76 subjects, and these results were correlated with epidemiological and demographical data. RESULTS: MCPyV DNA was detected in 23 of 69 (33.3%) basal cell carcinomas, in 2 of 11 (18%) squamous cell carcinomas, 2 of 4 Bowen disease case, 0 of 1 MCC and 4 of 11 other skin disorders. CONCLUSION: Despite the frequent detection of MCPyV DNA in NMSC, its possible role in the development of NMSC still needs further investigation.
RESUMO
Zika virus (ZIKV) is an emergent arbovirus that has attracted attention in the last year as a possible causative agent of congenital malformation; it shows a remarkably increased microcephaly risk during otherwise healthy pregnancies. We present here an analysis of all ZIKV sequences available in Genbank up to April 2016, studying the mutations in the whole polyprotein and their possible structural implications for the proteins E, NS1, NS3 and NS5. This study suggests that microcephaly is not a consequence of any particular amino acid substitution but, conceivably, is a feature of ZIKV itself. Moreover, the structural analysis of ZIKV proteins, together with the mutational landscape of ZIKV and a structure-sequence comparison with other flaviviruses, allows the suggestion of regions that could be exploited as anti-ZIKV targets, including some allosteric sites found in the NS3 and NS5 proteins of DENV.
