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2016 ; 1
(7
): 16069
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Influenza virus mRNA trafficking through host nuclear speckles
#MMPMID27572970
Mor A
; White A
; Zhang K
; Thompson M
; Esparza M
; Muñoz-Moreno R
; Koide K
; Lynch KW
; García-Sastre A
; Fontoura BM
Nat Microbiol
2016[May]; 1
(7
): 16069
PMID27572970
show ga
Influenza A virus is a human pathogen with a genome composed of eight viral RNA
segments that replicate in the nucleus. Two viral mRNAs are alternatively
spliced. The unspliced M1 mRNA is translated into the matrix M1 protein, while
the ion channel M2 protein is generated after alternative splicing. These
proteins are critical mediators of viral trafficking and budding. We show that
the influenza virus uses nuclear speckles to promote post-transcriptional
splicing of its M1 mRNA. We assign previously unknown roles for the viral NS1
protein and cellular factors to an intranuclear trafficking pathway that targets
the viral M1 mRNA to nuclear speckles, mediates splicing at these nuclear bodies
and exports the spliced M2 mRNA from the nucleus. Given that nuclear speckles are
storage sites for splicing factors, which leave these sites to splice cellular
pre-mRNAs at transcribing genes, we reveal a functional subversion of nuclear
speckles to promote viral gene expression.
|*RNA Splicing
[MESH]
|Alternative Splicing
[MESH]
|Cell Line
[MESH]
|Cell Nucleus/*virology
[MESH]
|Gene Expression Regulation, Viral
[MESH]
|Genome, Viral
[MESH]
|Host-Pathogen Interactions
[MESH]
|Humans
[MESH]
|Influenza A virus/*genetics/pathogenicity/physiology
[MESH]