Hairpin primers for simplified single-nucleotide polymorphism analysis of Mycobacterium tuberculosis and other organisms

被引:41
作者
Hazbón, MH
Alland, D
机构
[1] Univ Med & Dent New Jersey, New Jersey Med Sch, Dept Med, Div Infect Dis, Newark, NJ 07103 USA
[2] Univ Med & Dent New Jersey, New Jersey Med Sch, Ruy V Lourenco Ctr Study Emerging & Reemerging Pa, Newark, NJ 07103 USA
关键词
D O I
10.1128/JCM.42.3.1236-1242.2004
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
We describe a novel, simple, rapid, and highly sensitive method to detect single-nucleotide polymorphisms (SNPs) in Mycobacterium tuberculosis and other organisms. Amplification refractory mutation (ARMS) SNP assays were modified by converting the SNP-detecting linear primers in the ARMS assay to hairpin-shaped primers (HPs) through the addition of a 5' tail complementary to the 3' end of the linear primer. The improved ability of these primers to detect SNPs in M. tuberculosis was compared in a real-time PCR with SYBR-I green dye. Linear primers resulted in incorrect or indeterminate allele designation for 6 of the 13 SNP alleles tested in seven different SNP assays, while HPs determined the correct SNP in all cases. We compared the cycle threshold differences (DeltaC(t)) between the reactions containing primer-template matches and the reactions containing primer-template mismatches (where a larger DeltaC(t) indicates a more robust assay). The use of HPs dramatically improved the mean DeltaC(t) values for the SNP assays (7.6 for linear primers and 11.2 for HPs). We designed 98 different HP assays for SNPs previously associated with resistance to the antibiotic isoniazid to test the large-scale utility of the HP approach. Assay design was successful in 72.4%, 83.7%, 88.8%, and 92.9% of the assays after one to four rounds of assay design, respectively. HP SNP assays are simple, sensitive, robust, and inexpensive. These advantages favor the application of this technique for SNP assays of M. tuberculosis and other organisms.
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页码:1236 / 1242
页数:7
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