Ravi Prakash1,2,3, Rahul Gupta1, Pragya Sharma2, Sanjay Jain4, Devendra Singh Chauhan2, Vishwa Mohan Katoch5,6, Pramod Kumar Tiwari1. 1. a Centre for Genomics, Molecular and Human Genetics , Jiwaji University , Gwalior , India. 2. b Department of Microbiology and Molecular Biology , National JALMA Institute for Leprosy and other Mycobacterial Diseases , Agra , India. 3. c Key Laboratory of Medical Molecular Virology , Fudan University , Shanghai , China. 4. d Revised National Tuberculosis Control Programme , District Hospital , Sheopur , India. 5. e Former Secretary, Department of Health Research, Govt. of India and Former Director General , Indian Council of Medical Research , Ansari Nagar , New Delhi , India. 6. f Rajasthan University of Health Sciences , Jaipur , India.
Abstract
BACKGROUND: Different strains of Mycobacterium tuberculosis (MTB) are known to have different epidemiological and clinical characteristics. Some of them are widely distributed and associated with drug resistance, whereas others are locally predominated. Molecular epidemiological investigations have always been beneficial in identifying new strains and studying their transmission dynamics. Sahariya a primitive tribe of North Madhya Pradesh, India, has already been reported to have high prevalence of tuberculosis (TB) than their non-tribal neighbours. However, the information about MTB genotypes prevalent in Sahariya tribe and their non-tribal neighbours is not available. METHODS: A total of 214 clinical isolates representing Sahariya tribe and non-tribes were analyzed by spoligotyping and MIRU-VNTR typing. RESULTS: The EAI3_IND/SIT11 genotype was observed as major genotype in Sahariya tribe followed by CAS1_Delhi/SIT26 genotype. A 3.04 fold higher risk of getting TB with EAI3_IND/SIT11 genotype was observed in Sahariya as compared to the non-tribal population. The EAI_IND/SIT11 genotype also found to have more number of MDR-TB cases in Sahariya as well as true and possible transmission links. In Sahariya tribe, 3 clusters (6 isolates) reflected true transmission links, whereas 8 clusters consisted of 26 isolates revealed possible transmission links within the same geographical location or nearby houses. CONCLUSION: The present study highlighted the predominance of EAI3_IND/SIT11 genotype in Sahariya tribe followed by CAS1_Delhi/SIT26 genotype. Combined approach of MIRU-VNTR typing and spoligotyping was observed more favourable in discrimination of MTB genotypes. Further, longitudinal studies using whole genome sequencing can provide more insights into genetic diversity, drug resistance and transmission dynamics of these prevalent genotypes.
BACKGROUND: Different strains of Mycobacterium tuberculosis (MTB) are known to have different epidemiological and clinical characteristics. Some of them are widely distributed and associated with drug resistance, whereas others are locally predominated. Molecular epidemiological investigations have always been beneficial in identifying new strains and studying their transmission dynamics. Sahariya a primitive tribe of North Madhya Pradesh, India, has already been reported to have high prevalence of tuberculosis (TB) than their non-tribal neighbours. However, the information about MTB genotypes prevalent in Sahariya tribe and their non-tribal neighbours is not available. METHODS: A total of 214 clinical isolates representing Sahariya tribe and non-tribes were analyzed by spoligotyping and MIRU-VNTR typing. RESULTS: The EAI3_IND/SIT11 genotype was observed as major genotype in Sahariya tribe followed by CAS1_Delhi/SIT26 genotype. A 3.04 fold higher risk of getting TB with EAI3_IND/SIT11 genotype was observed in Sahariya as compared to the non-tribal population. The EAI_IND/SIT11 genotype also found to have more number of MDR-TB cases in Sahariya as well as true and possible transmission links. In Sahariya tribe, 3 clusters (6 isolates) reflected true transmission links, whereas 8 clusters consisted of 26 isolates revealed possible transmission links within the same geographical location or nearby houses. CONCLUSION: The present study highlighted the predominance of EAI3_IND/SIT11 genotype in Sahariya tribe followed by CAS1_Delhi/SIT26 genotype. Combined approach of MIRU-VNTR typing and spoligotyping was observed more favourable in discrimination of MTB genotypes. Further, longitudinal studies using whole genome sequencing can provide more insights into genetic diversity, drug resistance and transmission dynamics of these prevalent genotypes.
Authors: Caroline Allix-Béguec; Dag Harmsen; Thomas Weniger; Philip Supply; Stefan Niemann Journal: J Clin Microbiol Date: 2008-06-11 Impact factor: 5.948
Authors: Prithvi R Sharma; Shweta Singh; Mamta Jena; Gunja Mishra; Ravi Prakash; P K Das; R N K Bamezai; P K Tiwari Journal: Infect Genet Evol Date: 2011-05-27 Impact factor: 3.342
Authors: D S Chauhan; V D Sharma; Deepti Parashar; Aradhana Chauhan; D Singh; H B Singh; R Das; B M Aggarwal; B Malhotra; Amita Jain; Meera Sharma; V K Kataria; J K Aggarwal; Mohamad Hanif; Aruna Shahani; V M Katoch Journal: Indian J Med Res Date: 2007-04 Impact factor: 2.375