Method for the detection and identification of methicillin-resistant Staphylococcus aureus
First Claim
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1. A method to detect the presence of an MREJ type v methicillin-resistant Staphylococcus aureus (MRSA) strain nucleic acid in a sample, comprising:
- a) performing an amplification reaction comprising contacting a sample to be analyzed for the presence of said MREJ type v MRSA strain nucleic acid with a first amplification primer and a second amplification primer to generate a first amplicon if said MREJ type v MRSA strain nucleic acid is present in said sample, said MREJ type v MRSA strain nucleic acid including a staphylococcal cassette chromosome mec (SCCmec) element containing a mecA gene inserted into chromosomal DNA, said chromosomal DNA being orfX, thereby generating a polymorphic right extremity junction (MREJ) type v nucleic acid sequence that comprises nucleic acid sequences from both the SCCmec element right extremity and orfX adjoining said right extremity;
wherein said first primer is at least 10 nucleotides in length and specifically hybridizes at least under conditions of 50 mM KCl, 10 mM Tris-HCl (pH 9.0), 0.1% Triton X-100, 2.5 mM MgCl2 at 55°
C. with an SCCmec element right extremity of an MREJ type v nucleic acid sequence selected from the group consisting of;
SEQ ID NOs;
47-50, and the complements thereof,wherein said second primer is at least 10 nucleotides in length and specifically hybridizes at least under conditions of 50 mM KCl, 10 mM Tris-HCl (pH 9.0), 0.1% Triton X-100, 2.5 mM MgCl2 at 55°
C. with orfX,wherein said first amplicon generated if said MREJ type v MRSA strain nucleic acid is present in said sample comprises polymorphic right extremity junction (MREJ) type v sequence and orfX sequence, including the junction of the two, and is indicative of the presence of MREJ type v MRSA strain nucleic acid in said sample; and
b) generating and detecting said first amplicon.
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Abstract
The present invention describes novel SCCmec right extremity junction sequences for the detection of methicillin-resistant Staphyloccocus aureus (MRSA). It relates to the use of these DNA sequences for diagnostic purposes.
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27 Claims
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1. A method to detect the presence of an MREJ type v methicillin-resistant Staphylococcus aureus (MRSA) strain nucleic acid in a sample, comprising:
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a) performing an amplification reaction comprising contacting a sample to be analyzed for the presence of said MREJ type v MRSA strain nucleic acid with a first amplification primer and a second amplification primer to generate a first amplicon if said MREJ type v MRSA strain nucleic acid is present in said sample, said MREJ type v MRSA strain nucleic acid including a staphylococcal cassette chromosome mec (SCCmec) element containing a mecA gene inserted into chromosomal DNA, said chromosomal DNA being orfX, thereby generating a polymorphic right extremity junction (MREJ) type v nucleic acid sequence that comprises nucleic acid sequences from both the SCCmec element right extremity and orfX adjoining said right extremity; wherein said first primer is at least 10 nucleotides in length and specifically hybridizes at least under conditions of 50 mM KCl, 10 mM Tris-HCl (pH 9.0), 0.1% Triton X-100, 2.5 mM MgCl2 at 55°
C. with an SCCmec element right extremity of an MREJ type v nucleic acid sequence selected from the group consisting of;
SEQ ID NOs;
47-50, and the complements thereof,wherein said second primer is at least 10 nucleotides in length and specifically hybridizes at least under conditions of 50 mM KCl, 10 mM Tris-HCl (pH 9.0), 0.1% Triton X-100, 2.5 mM MgCl2 at 55°
C. with orfX,wherein said first amplicon generated if said MREJ type v MRSA strain nucleic acid is present in said sample comprises polymorphic right extremity junction (MREJ) type v sequence and orfX sequence, including the junction of the two, and is indicative of the presence of MREJ type v MRSA strain nucleic acid in said sample; and b) generating and detecting said first amplicon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification