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Updated: May 16, 2026

DNA Fingerprinting of Mycobacterium leprae Strains Using Variable Number Tandem Repeat (VNTR) - Fragment Length Analysis (FLA)
Published on: July 15, 2011
[The study of inter-simple sequences repeat genotyping based on one pentanucleotide repeat sequences in mycobacteria]
Shi-hui Gao1, Zhong-yi Hu, Ying-wei Zhao
1School of Biology and Basic Medical Sciences Soochow University, Suzhou 215123, China.
Objective:
To establish inter-simple sequences repeat (ISSR) molecular makers based on (CAGCG)n repeat sequence in mycobacteria.
Methods:
The distribution of pentanucleotide repeat sequence (CAGCG)n in mycobacterial genomes was analyzed by MICdb 2.0 software in the microsatellite database. ISSR primer MISP6 based on (CAGCG)n sequences was designed and tested in mycobacterial strains, which included 17 mycobacterial strains and 41 Mycobacterium tuberculosis clinical strains.
Results:
The abundances of pentanucleotide repeat sequences (CAGCG)n were high in most of the mycobacterial genomes and they were mainly located in the coding regions. The results of ISSR analysis in mycobacteria showed that 15 reference strains from mycobacteria were clustered into 2 major clusters. The first cluster contained 2 subtypes and the second cluster contained 4 subtypes. Forty-one clinical strains from Mycobacterium tuberculosis were divided into 2 major clusters by the analysis of MISP6 primer, and each cluster had 2 subtypes.
Conclusion:
ISSR primer MISP6 based on (CAGCG)n sequences can be used as a genetic marker to genotype mycobacterial strains.
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