title: Molecular typing of Mycobacterium tuberculosis isolates from different parts of India based on IS6110 element polymorphism using RFLP analysis.
abstract: OBJECTIVE
  IS 6110 based typing remains the internationally accepted standard and continues to provide new insights into the epidemiology of Mycobacterium tuberculosis. The aim of the study was to characterize M. tuberculosis isolates obtained from different parts of India based on IS6110 element polymorphism using restriction fragment length polymorphism (RFLP) analysis.
  
  
  METHODS
  RFLP was analyzed among 308 isolates of M. tuberculosis deposited in the Mycobacterial Repository Centre, Agra, from different parts of India. DNAs isolated from these strains were restricted with Pvu II, transferred on to nylon membrane and hybridized with a PCR amplified DIG-labeled 245 bp IS6110 probe.
  
  
  RESULTS
  Based on the copy number, M. tuberculosis isolates were classified into four groups, (i) lacking IS6110 element; (ii) low copy number (1-2); (iii) intermediate copy number (3-5); and (iv) high copy number (6-19). Copy number higher than 19 however was not observed in any of the isolates studied. At the national level, 56 per cent of the isolates showed high copy number of IS6110, 13 per cent showed intermediate copy number, 20 per cent showed low copy number, whereas 11 per cent isolates lacked IS6110 element. At the regional level, there was not much difference in the RFLP profiles of isolates (IS6110 copy numbers/patterns) from different parts of the country.
  
  
  CONCLUSIONS
  IS6110 DNA based fingerprinting could be a potentially useful tool for investigating the epidemiology of tuberculosis in India.
authors.affiliation: National JALMA Institute for Leprosy & Other Mycobacterial Diseases, Agra, India.
authors.forename: D S
authors.initials: DS
authors.lastname: Chauhan
authors.forename: V D
authors.initials: VD
authors.lastname: Sharma
authors.forename: Deepti
authors.initials: D
authors.lastname: Parashar
authors.forename: Aradhana
authors.initials: A
authors.lastname: Chauhan
authors.forename: D
authors.initials: D
authors.lastname: Singh
authors.forename: H B
authors.initials: HB
authors.lastname: Singh
authors.forename: R
authors.initials: R
authors.lastname: Das
authors.forename: B M
authors.initials: BM
authors.lastname: Aggarwal
authors.forename: B
authors.initials: B
authors.lastname: Malhotra
authors.forename: Amita
authors.initials: A
authors.lastname: Jain
authors.forename: Meera
authors.initials: M
authors.lastname: Sharma
authors.forename: V K
authors.initials: VK
authors.lastname: Kataria
authors.forename: J K
authors.initials: JK
authors.lastname: Aggarwal
authors.forename: Mohamad
authors.initials: M
authors.lastname: Hanif
authors.forename: Aruna
authors.initials: A
authors.lastname: Shahani
authors.forename: V M
authors.initials: VM
authors.lastname: Katoch
mesh_terms: D015373:Bacterial Typing Techniques; D018628:Gene Dosage; D006801:Humans; D007194:India / Q000453:epidemiology; D009169:Mycobacterium tuberculosis / Q000145:classification / Q000235:genetics; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D014376:Tuberculosis / Q000453:epidemiology