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Development of a reverse-genetics system for murine norovirus 3: long-term persistence occurs in the caecum and colon

ARIAS, Armando ; BAILEY, Dalan ; CHAUDHRY, Yasmin ; GOODFELLOW, Ian

Journal of general virology, 2012-07, Vol.93 (Pt 7), p.1432-1441 [Periódico revisado por pares]

Reading: Society for General Microbiology

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Título:
Development of a reverse-genetics system for murine norovirus 3: long-term persistence occurs in the caecum and colon
Autor: ARIAS, Armando ; BAILEY, Dalan ; CHAUDHRY, Yasmin ; GOODFELLOW, Ian
Assuntos: Adaptation, Biological ; Animal ; Animals ; Biological and medical sciences ; Caliciviridae Infections - pathology ; Caliciviridae Infections - virology ; Cecum - virology ; Cell Line ; Colon - virology ; Disease Models, Animal ; DNA Mutational Analysis ; Feces - virology ; Fundamental and applied biological sciences. Psychology ; Gastroenteritis - pathology ; Gastroenteritis - virology ; Genetics ; Macrophages - virology ; Male ; Mice ; Mice, Inbred C57BL ; Microbiology ; Miscellaneous ; Molecular Sequence Data ; Norovirus - genetics ; Norovirus - growth & development ; Norovirus - pathogenicity ; Reverse Genetics - methods ; RNA, Viral - genetics ; Sequence Analysis, DNA ; Viral Proteins - genetics ; Virology
É parte de: Journal of general virology, 2012-07, Vol.93 (Pt 7), p.1432-1441
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Present address: Institute for Animal Health – Pirbright, Ash Rd, Guildford, GU24 0NF, UK.
The GenBank/EMBL/DDBJ accession number for the MNV-3 cDNA sequence used here to recover infectious MNV-3 by reverse genetics is JQ658375.
Descrição: Human noroviruses (HuNoV) are a major cause of viral gastroenteritis worldwide, yet, due to the inability to propagate HuNoV in cell culture, murine norovirus (MNV) is typically used as a surrogate to study norovirus biology. MNV-3 represents an attractive strain to study norovirus infections in vivo because it establishes persistence in wild-type mice, yet causes symptoms resembling gastroenteritis in immune-compromised STAT1(-/-) mice. The lack of reverse-genetics approaches to recover genetically defined MNV-3 has limited further studies on the identification of viral sequences that contribute to persistence. Here we report the establishment of a combined DNA-based reverse-genetics and mouse-model system to study persistent MNV-3 infections in wild-type (C57BL/6) mice. Viral RNA and infectious virus were detected in faeces for at least 56 days after inoculation. Strikingly, the highest concentrations of viral RNA during persistence were detected in the caecum and colon, suggesting that viral persistence is maintained in these tissues. Possible adaptive changes arising during persistence in vivo appeared to accumulate in the minor capsid protein (VP2) and the viral polymerase (NS7), in contrast with adaptive mutations selected during cell-culture passages in RAW264.7 cells that appeared in the major capsid protein (VP1) and non-structural protein NS4. This system provides an attractive model that can be readily used to identify viral sequences that contribute to persistence in an immunocompetent host and to more acute infection in an immunocompromised host, providing new insights into the biology of norovirus infections.
Editor: Reading: Society for General Microbiology
Idioma: Inglês

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Development of a reverse-genetics system for murine norovirus 3: long-term persistence occurs in the caecum and colon

ARIAS, Armando ; BAILEY, Dalan ; CHAUDHRY, Yasmin ; GOODFELLOW, Ian

Reading: Society for General Microbiology

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