Rapid identification of oseltamivir-resistant influenza A(H1N1) viruses with H274Y mutation by RT-PCR/restriction fragment length polymorphism assay.
In the beginning of 2007-2008 Northern Hemisphere influenza season, the frequency of influenza A(H1N1) viruses bearing a previously defined oseltamivir resistance conferring amino acid change of Histidine to Tyrosine at position 274 (H274Y) of the neuraminidase (NA) increased dramatically. In order to rapidly detect such resistant viruses, an RT-PCR/restriction fragment length polymorphism (RT-PCR/RFLP) assay targeting amino acid 274 of the N1 NA molecule was developed to investigate the presence or absence of the H274Y mutation. The reverse primer was engineered to produce a BspHI site in the amplicon for oseltamivir-sensitive viruses with Histidine at position 274 (274H). A total of 50 influenza A(H1N1) specimens including 30 oseltamivir-sensitive and 20 oseltamivir-resistant ones submitted to the Centers for Disease Control and Prevention (CDC) during the 2007-2008 influenza season were successfully characterized by this assay. The assay was specific for grown A(H1N1) viruses and original clinical specimens, with a lower limit of detection of approximately 10 RNA transcript copies per reaction. Our RT-PCR/RFLP assay provides a simple, rapid and sensitive tool to monitor the emergence and spread of H274Y oseltamivir-resistant influenza A(H1N1) viruses.
Virus Surveillance and Diagnosis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, 1600 Clifton Rd, MS:G-16, Atlanta, GA 30333, USA.
Lizheng
L
Guo
Rebecca J
RJ
Garten
Angie S
AS
Foust
Wendy M
WM
Sessions
Margaret
M
Okomo-Adhiambo
Larisa V
LV
Gubareva
Alexander I
AI
Klimov
Xiyan
X
Xu
D000998:Antiviral Agents / Q000627:therapeutic use*; D024882:Drug Resistance, Viral; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification*; D007251:Influenza, Human / Q000188:drug therapy / Q000821:virology*; D020125:Mutation, Missense; D009439:Neuraminidase / Q000235:genetics*; D053139:Oseltamivir / Q000627:therapeutic use*; D012150:Polymorphism, Restriction Fragment Length; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods*; D014764:Viral Proteins / Q000235:genetics*
D000998:Antiviral Agents; D014764:Viral Proteins; D053139:Oseltamivir; C487630:NA protein, influenza A virus; D009439:Neuraminidase