Compositions for use in identification of influenza viruses
The present invention provides oligonucleotide primers, compositions, and kits containing the same for rapid identification of viruses which are members of the influenza virus family by amplification of a segment of viral nucleic acid followed by molecular mass analysis.
1 . A composition comprising a purified oligonucleotide primer pair wherein each member of said primer pair is 20 to 35 nucleobases in length and wherein the forward primer comprises at least 70% sequence identity with SEQ ID NO: 119 and the reverse primer comprises at least 70% sequence identity with SEQ ID NO: 120.
2 . The composition of claim 1 wherein at least one of said forward primer or said reverse primer comprises at least one modified nucleobase.
3 . The composition of claim 2 wherein said modified nucleobase is a mass modified nucleobase.
4 . The composition of claim 3 wherein said mass modified nucleobase is 5-Iodo-C.
5 . The composition of claim 2 wherein said modified nucleobase is a universal nucleobase.
6 . The composition of claim 5 wherein said universal nucleobase is inosine.
7 . The composition of claim 1 wherein at least one of said forward primer or said reverse primer lacks a non-templated T residue at its 5′-end.
8 . The composition of claim 2 wherein said modified nucleobase comprises a molecular mass modifying tag.
9 . A kit comprising an oligonucleotide primer pair wherein each primer of said primer pair is 20 to 35 nucleobases in length and wherein the forward primer comprises at least 70% sequence identity with SEQ ID NO: 119 and the reverse primer comprises at least 70% sequence identity with SEQ ID NO: 120.
10 .- 59 . (canceled)
60 . The composition of claim 1 wherein said forward primer comprises at least 80% sequence identity with SEQ ID NO: 119.
61 . The composition of claim 1 wherein said forward primer comprises 100% sequence identity with SEQ ID NO: 119.
62 . The composition of claim 1 wherein said reverse primer comprises at least 80% sequence identity with SEQ ID NO: 120.
63 . The composition of claim 1 wherein said reverse primer comprises 100% sequence identity with SEQ ID NO: 120.
64 . A method for identifying an influenza virus comprising:
a) obtaining a sample suspected of comprising at least one bioagent;
b) amplifying one or more nucleic acids from said sample using a primer pair configured to generate amplicons from two or more members of the orthomyxovirdae family by hybridizing a forward primer and a reverse primer to conserved regions of a NS1 encoding gene, said conserved regions flanking a region that varies between said two or more members of said orthomyxovirdae family wherein said amplifying of said one or more nucleic acids results in at least one amplicon and wherein said at least one amplicon is between 45 consecutive nucleobases in length and 200 consecutive nucleobases in length; and
c) determining a molecular mass of said at least one amplicon using a mass spectrometer.
69 . The method of claim 64 wherein said NS1 encoding gene is from influenzavirus A.
70 . The method of claim 64 wherein said forward primer comprises at least 70% sequence identity to SEQ ID NO: 119.
71 . The method of claim 64 wherein said forward primer comprises at least 80% sequence identity to SEQ ID NO: 119.
72 . The method of claim 64 wherein said forward primer comprises at least 90% sequence identity to SEQ ID NO: 119.
73 . The method of claim 64 wherein said forward primer comprises 100% sequence identity to SEQ ID NO: 119.
74 . The method of claim 64 wherein said reverse primer comprises at least 70% sequence identity to SEQ ID NO: 120.
75 . The method of claim 64 wherein said reverse primer comprises at least 80% sequence identity to SEQ ID NO: 120.
76 . The method of claim 64 wherein said reverse primer comprises at least 90% sequence identity to SEQ ID NO: 120.
77 . The method of claim 64 wherein said reverse primer comprises 100% sequence identity to SEQ ID NO: 120.
78 . The method of claim 64 wherein at least one of said forward primer or said reverse primer comprises at least one modified nucleobase.
79 . The method of claim 78 wherein said modified nucleobase is a mass modified nucleobase.
80 . The method of claim 79 wherein said mass modified nucleobase is 5-Iodo-C.
81 . The method of claim 78 wherein said modified nucleobase is a universal nucleobase.
82 . The method of claim 81 wherein said universal nucleobase is inosine.
83 . The method of claim 64 wherein at least one of said forward primer or said reverse primer comprises a non-templated T residue at its 5′-end.
84 . The method of claim 78 wherein said modified nucleobase comprises a molecular mass modifying tag.
85 . The method of claim 64 wherein said amplifying step comprises use of at least one additional primer pair configured to hybridize with conserved regions of a gene selected from the group consisting of PB1, NUC, M1, PA, NS1, NS2, PB2 and a combination thereof.
86 . The method of claim 64 wherein said at least one bioagent in said sample is identified by one or more of its genus, species, sub-species, serotype, genotype, or combination thereof.
87 . The method of claim 64 wherein said region that varies between two or more members of said orthomyxoviridae family comprises base composition variability between the two or more members of said orthomyxoviridae family.
88 . A composition comprising a primer pair configured to generate amplicons from two or more members of the orthomyxovirdae family by hybridizing a forward primer and a reverse primer to conserved regions of a NS1 encoding gene in two or more members of said orthomyxovirdae family, said primer pair comprising a forward primer of at least 15 oligonucleotides and reverse primer of at least 15 oligonucleotides, said conserved regions flanking a region that varies between said two or more members of said orthomyxovirdae family wherein upon amplification of a nucleic acid from a member of said orthomyxovirdae family said primer pair generates an amplicon between 45 consecutive nucleobases in length and 200 consecutive nucleobases in length.