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Re: snippets recent reassortment papers
Re: snippets recent reassortment papers
recent reassortment papers:
------------------------------------------------------------------------------------
NS-reassortment of H5N1 HPAIV viruses in the background of A/FPV/Rostock/1934
(H7N1) HPAIV has been shown to change virus replication kinetics and host cell response
in mammalian cells the NS-segment of A/Vietnam/1203/2004 (FPV NS VN, H5N1) HPAIV
significantly altered the characteristics of the H7-prototype HPAIV in tracheal organ
cultures (TOC) of chicken and turkey in vitro, with decreased replication efficiency
accompanied by increased induction of type I interferon (IFN) and apoptosis.
NS-reassortant FPV NS VN showed an overall highly-pathogenic phenotype with increased
virulence and replication potential compared to the wild-type virus after systemic infection
of chicken and turkey embryos.
http://www.ncbi.nlm.nih.gov/pubmed/23468508
-----------------------------------------------------------------------------
A/Udorn/307/72 (Udorn) and the high-growth A/Puerto Rico/8/34 (PR8) virus we assessed
the influence of the source of the PB1 gene on virus growth and vaccine yield. Classical
reassortment of these two strains led to the selection of viruses that predominantly had
the Udorn PB1 gene.
http://www.ncbi.nlm.nih.gov/pubmed/23468502
------------------------------------------------------------------------
Influenza viruses with rearranged genomes as live-attenuated vaccines.
-----------------------------------------------------------------------
of cross-immunity acquired through previous infections or vaccination can greatly constrain
pandemic emergence.
http://www.ncbi.nlm.nih.gov/pubmed/23438428
----------------------------------------------------------------------------------------------
mutations in H5 and H9 hemagglutinin (HA) in the context of lab-generated reassorted viruses
conferred aerosol transmissibility in ferrets (a property shared by human adapted viruses).
We previously demonstrated that the quantitative binding affinity of HA to α2→6 sialylated
glycans (human receptors) is one of the important factors governing human adaptation of HA.
Although the H7 subtype has infected humans causing varied clinical outcomes from mild
conjunctivitis to severe respiratory illnesses
Eurasian (H7N7) and North American (H7N2) lineages that have caused human infection.
Furthermore, we have demonstrated for the first time that two specific mutations;
Gln226→Leu and Gly228→Ser in glycan receptor-binding site of H7 HA substantially
increase its binding affinity to human receptor
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3577880/
---------------------------------------------------------------------------------------------
(A/duck/Hunan/69/2004) encoding NS1-ESKV and NS1-138Y was confined to the respiratory
tract of infected mice, whereas a mutant encoding NS1-ESEV and NS1-138F caused systemic
infection and killed mice more efficiently.
functional interplay between the mutations at NS1-138 and NS1-229 that results in a synergistic
effect on influenza virulence.
--------------------------------------------------------------------------------------------
isolate AI2114 produced an intravenous pathogenicity index (IVPI) score of 1.37 in chickens
whereas isolate AI2214 produced an IVPI score of 0.8. The former virus had an additional,
predicted N-linked glycosylation site at position 88 of the hemagglutinin protein as well as
an E627K mutation in the PB2 protein that was lacking from AI2214.
------------------------------------------------------------------------------------
To better understand host adaptation between mammalian species in real time, we passaged
mouse-adapted A/PR8/34 (PR8) in guinea pigs. Guinea pigs, unlike mice, support spontaneous
and robust IAV transmission. For some IAV strains, including PR8, adaptation is required for a
virus to attain transmissibility,
-----------------------------------------------------------------
Multiple guinea pig-adapted PR8 mutants generated by serial nasal wash passaging in independent
lines replicated more efficiently and transmitted by co-caging. All transmissible variants possessed
one of two non-synonymous mutations in M1, either alone or in combination with mutations in
PB2, HA, NP or NA. Rapid reassortment between independently selected variants combined beneficial
mutations in NP and M1 to form the fittest transmitting virus. These findings provide further insight
into genetic determinants in NP and M1 involved in PR8 IAV adaptation to transmit in a new host,
and clearly show the benefit of a segmented genome in rapidly generating optimal combinations of
mutations in IAV evolution
----------------------------------------------------------------------
After serial passages in ferrets, a dominant H1N2 virus population was obtained with a constellation
of gene segments, most of which, except for the neuraminidase (NA) and PB1 segments, were from
the H1N1pdm strain. Our studies suggest that ferrets recapitulate influenza virus reassortment events.
The H1N2 virus generated through this process resembles similar viruses that are emerging in nature,
particularly in pigs.
------------------------------------------------------------------------------
viruses possessing the hemagglutinin (HA) gene of Norway3487 in the genetic background
of Osaka164 were more pathogenic in mice
-------------------------------------------------------------------------------
A/HK/156/97 (H5N1) [E92 or E92D NS1] with NS from A/PR/834(H1N1) [D92 NS1]
----------------------------------------------------------------------------------
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509451/
--------------------------------------------------------------------------------------------
Possible outcomes of reassortment in vivo between wild type and live attenuated influenza vaccine strains.
--------------------------------------------------------------------------
reassortant H5N2 avian influenza virus from domestic mallard ducks in eastern China.
-------------------------------------------------------------------
reassortment between H1 and H3 in East India
----------------------------------------------------------------------------------
reassortant H9 viruses with pH1N1 genes show increased virulence in mice and transmissibility in
ferrets The parental H9N2 and reassortant H9N2/CA09 viruses were transmitted to sentinel chickens,
but H9N1/CA09 virus was not. The parental H9N2 replicated poorly and was not transmitted in pigs,
whereas both H9N2/CA09 and H9N1/CA09 viruses replicated and were transmitted efficiently in pigs,
similar to the pH1N1 virus.
---------------------------------------------------------------------------------
variation in the viral genome composition of these isolates had limited effects on duration, extent
and pattern of viral shedding, as well as on the reduction of infectivity in water over time
-----------------------------------------------------------------------------------
Quail as a potential mixing vessel for the generation of new reassortant influenza A viruses.
-----------------------------------------------------------------------------------
The potential for respiratory droplet-transmissible A/H5N1 influenza virus to evolve in a mammalian host.
-------------------------------------------------------------------------------------------------
In vitro reassortment between endemic H1N2 and 2009 H1N1 pandemic swine influenza viruses
generates attenuated viruses.
------------------------------------------------------------------------------------
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3416129/
7 of the 1918 LPAI 7:1 chimeric viruses replicated and caused disease equivalent to the
fully reconstructed 1918 virus
Only the PB2-chimeric was attenuated in mice This could be corrected by E627K
A/Green Wing Teal/Ohio/175/1986 (H2N1) and A/mallard/Ohio/265/1987 (H1N9) segment 4;
------------------------------------------------------------------------------------------
PA from an H5N1 highly pathogenic avian influenza virus activates viral transcription and
replication and induces apoptosis and interferon expression at an early stage of infection.
-------------------------------------------------------------------------
cold-adapted pH1N1 live attenuated vaccine (CApH1N1) elicits cross-reactive immunity to
seasonal and H5 influenza A viruses in the mouse
Re: snippets recent reassortment papers
recent reassortment papers:
------------------------------------------------------------------------------------
NS-reassortment of H5N1 HPAIV viruses in the background of A/FPV/Rostock/1934
(H7N1) HPAIV has been shown to change virus replication kinetics and host cell response
in mammalian cells the NS-segment of A/Vietnam/1203/2004 (FPV NS VN, H5N1) HPAIV
significantly altered the characteristics of the H7-prototype HPAIV in tracheal organ
cultures (TOC) of chicken and turkey in vitro, with decreased replication efficiency
accompanied by increased induction of type I interferon (IFN) and apoptosis.
NS-reassortant FPV NS VN showed an overall highly-pathogenic phenotype with increased
virulence and replication potential compared to the wild-type virus after systemic infection
of chicken and turkey embryos.
http://www.ncbi.nlm.nih.gov/pubmed/23468508
-----------------------------------------------------------------------------
A/Udorn/307/72 (Udorn) and the high-growth A/Puerto Rico/8/34 (PR8) virus we assessed
the influence of the source of the PB1 gene on virus growth and vaccine yield. Classical
reassortment of these two strains led to the selection of viruses that predominantly had
the Udorn PB1 gene.
http://www.ncbi.nlm.nih.gov/pubmed/23468502
------------------------------------------------------------------------
Influenza viruses with rearranged genomes as live-attenuated vaccines.
-----------------------------------------------------------------------
of cross-immunity acquired through previous infections or vaccination can greatly constrain
pandemic emergence.
http://www.ncbi.nlm.nih.gov/pubmed/23438428
----------------------------------------------------------------------------------------------
mutations in H5 and H9 hemagglutinin (HA) in the context of lab-generated reassorted viruses
conferred aerosol transmissibility in ferrets (a property shared by human adapted viruses).
We previously demonstrated that the quantitative binding affinity of HA to α2→6 sialylated
glycans (human receptors) is one of the important factors governing human adaptation of HA.
Although the H7 subtype has infected humans causing varied clinical outcomes from mild
conjunctivitis to severe respiratory illnesses
Eurasian (H7N7) and North American (H7N2) lineages that have caused human infection.
Furthermore, we have demonstrated for the first time that two specific mutations;
Gln226→Leu and Gly228→Ser in glycan receptor-binding site of H7 HA substantially
increase its binding affinity to human receptor
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3577880/
---------------------------------------------------------------------------------------------
(A/duck/Hunan/69/2004) encoding NS1-ESKV and NS1-138Y was confined to the respiratory
tract of infected mice, whereas a mutant encoding NS1-ESEV and NS1-138F caused systemic
infection and killed mice more efficiently.
functional interplay between the mutations at NS1-138 and NS1-229 that results in a synergistic
effect on influenza virulence.
--------------------------------------------------------------------------------------------
isolate AI2114 produced an intravenous pathogenicity index (IVPI) score of 1.37 in chickens
whereas isolate AI2214 produced an IVPI score of 0.8. The former virus had an additional,
predicted N-linked glycosylation site at position 88 of the hemagglutinin protein as well as
an E627K mutation in the PB2 protein that was lacking from AI2214.
------------------------------------------------------------------------------------
To better understand host adaptation between mammalian species in real time, we passaged
mouse-adapted A/PR8/34 (PR8) in guinea pigs. Guinea pigs, unlike mice, support spontaneous
and robust IAV transmission. For some IAV strains, including PR8, adaptation is required for a
virus to attain transmissibility,
-----------------------------------------------------------------
Multiple guinea pig-adapted PR8 mutants generated by serial nasal wash passaging in independent
lines replicated more efficiently and transmitted by co-caging. All transmissible variants possessed
one of two non-synonymous mutations in M1, either alone or in combination with mutations in
PB2, HA, NP or NA. Rapid reassortment between independently selected variants combined beneficial
mutations in NP and M1 to form the fittest transmitting virus. These findings provide further insight
into genetic determinants in NP and M1 involved in PR8 IAV adaptation to transmit in a new host,
and clearly show the benefit of a segmented genome in rapidly generating optimal combinations of
mutations in IAV evolution
----------------------------------------------------------------------
After serial passages in ferrets, a dominant H1N2 virus population was obtained with a constellation
of gene segments, most of which, except for the neuraminidase (NA) and PB1 segments, were from
the H1N1pdm strain. Our studies suggest that ferrets recapitulate influenza virus reassortment events.
The H1N2 virus generated through this process resembles similar viruses that are emerging in nature,
particularly in pigs.
------------------------------------------------------------------------------
viruses possessing the hemagglutinin (HA) gene of Norway3487 in the genetic background
of Osaka164 were more pathogenic in mice
-------------------------------------------------------------------------------
A/HK/156/97 (H5N1) [E92 or E92D NS1] with NS from A/PR/834(H1N1) [D92 NS1]
----------------------------------------------------------------------------------
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509451/
--------------------------------------------------------------------------------------------
Possible outcomes of reassortment in vivo between wild type and live attenuated influenza vaccine strains.
--------------------------------------------------------------------------
reassortant H5N2 avian influenza virus from domestic mallard ducks in eastern China.
-------------------------------------------------------------------
reassortment between H1 and H3 in East India
----------------------------------------------------------------------------------
reassortant H9 viruses with pH1N1 genes show increased virulence in mice and transmissibility in
ferrets The parental H9N2 and reassortant H9N2/CA09 viruses were transmitted to sentinel chickens,
but H9N1/CA09 virus was not. The parental H9N2 replicated poorly and was not transmitted in pigs,
whereas both H9N2/CA09 and H9N1/CA09 viruses replicated and were transmitted efficiently in pigs,
similar to the pH1N1 virus.
---------------------------------------------------------------------------------
variation in the viral genome composition of these isolates had limited effects on duration, extent
and pattern of viral shedding, as well as on the reduction of infectivity in water over time
-----------------------------------------------------------------------------------
Quail as a potential mixing vessel for the generation of new reassortant influenza A viruses.
-----------------------------------------------------------------------------------
The potential for respiratory droplet-transmissible A/H5N1 influenza virus to evolve in a mammalian host.
-------------------------------------------------------------------------------------------------
In vitro reassortment between endemic H1N2 and 2009 H1N1 pandemic swine influenza viruses
generates attenuated viruses.
------------------------------------------------------------------------------------
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3416129/
7 of the 1918 LPAI 7:1 chimeric viruses replicated and caused disease equivalent to the
fully reconstructed 1918 virus
Only the PB2-chimeric was attenuated in mice This could be corrected by E627K
A/Green Wing Teal/Ohio/175/1986 (H2N1) and A/mallard/Ohio/265/1987 (H1N9) segment 4;
------------------------------------------------------------------------------------------
PA from an H5N1 highly pathogenic avian influenza virus activates viral transcription and
replication and induces apoptosis and interferon expression at an early stage of infection.
-------------------------------------------------------------------------
cold-adapted pH1N1 live attenuated vaccine (CApH1N1) elicits cross-reactive immunity to
seasonal and H5 influenza A viruses in the mouse