Search results for: Nalin Rastogi

Items from 1 to 20 out of 81 results

article

Genetic diversity of Mycobacterium tuberculosis from Pará, Brazil, reveals a higher frequency of ancestral strains than previously reported in South America

Emilyn Costa Conceição, Nalin Rastogi, David Couvin, Maria Luíza Lopes, more

Infection, Genetics and Evolution > 2017 > 56 > C > 62-72

There is only scarce information available on genotypic diversity of the Mycobacterium tuberculosis complex (MTBC) clinical isolates circulating in the Northern part of Brazil, a relatively neglected region regarding research on tuberculosis. We therefore characterized 980 MTBC clinical isolates from the state of Pará, by spoligotyping and data was compared with patterns from around the world, besides...

article

Mycobacterium tuberculosis genotypes and predominant clones among the multidrug-resistant isolates in Spain 1998–2005

Sofía Samper, Patricia Gavín, María Isabel Millán-Lou, María José Iglesias, more

Infection, Genetics and Evolution > 2017 > 55 > C > 117-126

Although the incidence of tuberculosis (TB) is gradually decreasing in Spain, there is an increase in the proportion of foreign-born cases. This changing scenario is slowly shifting the local TB epidemiology from endemic to imported cases with an increased risk for multidrug-resistant (MDR) and extensively drug resistant (XDR) strains of Mycobacterium tuberculosis complex. MDR/XDR strains from Spain...

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Molecular epidemiology of Mycobacterium tuberculosis in Baja California, Mexico: A result of human migration?

Carlos A. Flores-López, Roberto Zenteno-Cuevas, Rafael Laniado-Laborín, Yann Reynaud, more

Infection, Genetics and Evolution > 2017 > 55 > C > 378-383

The State of Baja California (BC) exhibits the highest incidence and prevalence rates of tuberculosis (TB), and multidrug-resistant TB (MDR-TB) in Mexico. However information about the circulation of M. tuberculosis lineages in BC and Mexico as a whole is limited. Here, we describe the genetic relationship and genetic diversity among M. tuberculosis clinical isolates (n=140) collected in BC between...

article

Comparative study of genotypes of Mycobacterium tuberculosis from a Northern Indian setting with strains reported from other parts of India and neighboring countries

Pragya Sharma, Kiran Katoch, Shilpi Chandra, Devendra Singh Chauhan, more

Tuberculosis > 2017 > 105 > C > 60-72

This study was carried out to characterize Mycobacterium tuberculosis population in Ghatampur, Kanpur, North India, by spoligotyping and Mycobacterial Interspersed Repetitive Units-Variable Number of Tandem Repeats (MIRU-VNTRs) typing. A total of 335 isolates were genotyped by spoligotyping and Central Asian (CAS) sub-lineage was the most prevalent, comprising 59.1% of all isolates. Other lineages...

article

SpolSimilaritySearch – A web tool to compare and search similarities between spoligotypes of Mycobacterium tuberculosis complex

David Couvin, Thierry Zozio, Nalin Rastogi

Tuberculosis > 2017 > 105 > C > 49-52

Spoligotyping is one of the most commonly used polymerase chain reaction (PCR)-based methods for identification and study of genetic diversity of Mycobacterium tuberculosis complex (MTBC). Despite its known limitations if used alone, the methodology is particularly useful when used in combination with other methods such as mycobacterial interspersed repetitive units – variable number of tandem DNA...

article

New Mycobacterium tuberculosis LAM sublineage with geographical specificity for the Old World revealed by phylogenetical and Bayesian analyses

Yann Reynaud, Nalin Rastogi

Tuberculosis > 2016 > 101 > C > 62-66

We recently showed that the Mycobacterium tuberculosis sublineage LAM9 could be subdivided as two distinct subpopulations – each reflecting its unique biogeographical structure and evolutionary history. We subsequently attempted to verify if this genetic structuration could be traced in an enlarged global sample. For this purpose, we analyzed global evolutionary relationships of LAM strains in a large...

article

A snapshot of the predominant single nucleotide polymorphism cluster groups of Mycobacterium tuberculosis clinical isolates in Delhi, India

Mandira Varma-Basil, Anshika Narang, Soumitesh Chakravorty, Kushal Garima, more

Tuberculosis > 2016 > 100 > C > 72-81

Several attempts have been made to associate phylogenetic differences among Mycobacterium tuberculosis strains to variations in the clinical outcome of the disease and to drug resistance. We genotyped 139 clinical isolates of M. tuberculosis obtained from patients of pulmonary tuberculosis in North Delhi region. The isolates were analyzed using nine Single nucleotide polymorphism (SNP) markers, spoligotyping...

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Genetic diversity of Mycobacterium tuberculosis complex strains isolated from patients with pulmonary tuberculosis in Anambra State, Nigeria

Gertrude N. Uzoewulu, Lovett Lawson, Ibeh S. Nnanna, Nalin Rastogi, more

International Journal of Mycobacteriology > 2016 > 5 > 1 > 74-79

In this study, we analyzed Mycobacterium tuberculosis complex (MTC) genetic diversity in Anambra State, Nigeria based on spoligotyping followed by 5-loci exact tandem repeats (ETRs). Spoligotyping of 180 MTC strains isolated in 2009–2011 from pulmonary tuberculosis (TB) patients led to a total of 31 distinct patterns. A comparison with the SITVIT2 international database showed that all the 31 patterns...

article

First insight into the molecular epidemiology of Mycobacterium tuberculosis in Santa Catarina, southern Brazil

Christiane Lourenço Nogueira, Rodrigo Ivan Prim, Simone Gonçalves Senna, Darcita Büerger Rovaris, more

Tuberculosis > 2016 > 97 > C > 57-64

Molecular epidemiology of Mycobacterium tuberculosis is useful for understanding disease transmission dynamics, and to establish strategic measures for TB control and prevention. The aim of this study was to analyze clinical, epidemiological and molecular characteristics of MTBC clinical isolates from Santa Catarina state, southern Brazil. During one-year period, 406 clinical isolates of MTBC were...

article

Characterization of mutations in streptomycin-resistant Mycobacterium tuberculosis isolates in Sichuan, China and the association between Beijing-lineage and dual-mutation in gidB

Honghu Sun, Congcong Zhang, Ling Xiang, Rui Pi, more

Tuberculosis > 2016 > 96 > C > 102-106

Mutations in rpsL, rrs, and gidB are well linked to streptomycin (STR) resistance, some of which are suggested to be potentially associated with Mycobacterium tuberculosis genotypic lineages in certain geographic regions. In this study, we aimed to investigate the mutation characteristics of streptomycin resistance and the relationship between the polymorphism of drug-resistant genes and the lineage...

article

Human multidrug-resistant Mycobacterium bovis infection in Mexico

Carlos A. Vazquez-Chacon, Armando Martínez-Guarneros, David Couvin, Jorge A. González-y-Merchand, more

Tuberculosis > 2015 > 95 > 6 > 802-809

Here, we describe the molecular characterization of six human Mycobacterium bovis clinical isolates, including three multidrug resistant (MDR) strains, collected in Mexico through the National Survey on Tuberculosis Drug Resistance (ENTB-2008), a nationally representative survey conducted during 2008–2009 in nine states with a stratified cluster sampling design. The genetic background of bovine M...

article

Mycobacterium tuberculosis polyclonal infections and microevolution identified by MIRU-VNTRs in an epidemiological study

Elisabeth Streit, Julie Millet, Nalin Rastogi

International Journal of Mycobacteriology > 2015 > 4 > 3 > 222-227

The advent of molecular typing using MIRU-VNTR mini-satellites has largely facilitated tuberculosis (TB) molecular epidemiological studies. Apart from detecting the chains of transmission and risk factors, these markers have also allowed to study the phenomena of mixed strain infections versus microevolutionary events.An initial set of Mycobacterium tuberculosis strains (n=161) genotyped using spoligotyping...

article

Prevalence of Latin-American-Mediterranean genetic family in population structure of Mycobacterium tuberculosis in Bulgaria

Violeta Valcheva, Nalin Rastogi, Igor Mokrousov

International Journal of Mycobacteriology > 2015 > 4 > 3 > 191-195

Tuberculosis (TB) control remains an important public health priority for Bulgaria. The population structure of Mycobacterium tuberculosis is clonal and certain genetic families of this species (e.g., Latin-American-Mediterranean [LAM]) have attracted more attention due to their global dissemination and/or particular pathogenic properties, e.g., association with multidrug resistance (MDR). The aim...

article

Tuberculosis – A global emergency: Tools and methods to monitor, understand, and control the epidemic with specific example of the Beijing lineage

David Couvin, Nalin Rastogi

Tuberculosis > 2015 > 95 > Supplement 1 > S177-S189

We argue in favor of a concerted and coordinated response to stop tuberculosis (TB) by monitoring global TB spread, drug-resistance surveillance and populations at risk using available molecular and web tools to identify circulating clones of Mycobacterium tuberculosis complex (MTBC). We took specific example of the Beijing lineage associated with worldwide emergence of both multiple, and extensively...

article

Phylogenetic associations with demographic, epidemiological and drug resistance characteristics of Mycobacterium tuberculosis lineages in the SITVIT2 database: Macro- and micro-geographical cleavages and phylogeographical specificities

Nalin Rastogi, David Couvin

International Journal of Mycobacteriology > 2015 > 4 > Supplement 1 > 117-118

The aim of this work was to highlight macro- and micro-geographical cleavages and phylogeographical specificities of circulating Mycobacterium tuberculosis complex (MTBC) clones worldwide to underline the demographic, epidemiological and drug resistance characteristics of major genotypic lineages.MTBC genotyping data was retrieved from an international TB genotyping database (SITVIT2) developed at...

article

Molecular epidemiology and evolutionary genetics of Mycobacterium tuberculosis isolated from different parts of India

Sarman Singh, Jitendra Singh, Manimuthu Mani Sankar, David Couvin, more

International Journal of Mycobacteriology > 2015 > 4 > Supplement 1 > 26

The evolutionary changes in mycobacterium tuberculosis (MTB) have been phenotypic as well as genotypic by diversifying into various lines of descent or lineages.A total of 538 MTB isolates obtained from different parts of India were included in the study. Spoligotyping and drug susceptibility testing was performed on all the MTB isolates. Major cities and parts of India from where these isolations...

article

Finer characterization of Mycobacterium tuberculosis using spoligotyping and 15-loci MIRU-VNTRs reveals phylogeographical specificities of isolates circulating in Guyana and Suriname

Elisabeth Streit, Shirematee Baboolal, Patrick E. Akpaka, Julie Millet, more

Infection, Genetics and Evolution > 2015 > 30 > C > 114-119

In this study we used spoligotyping and 15-loci MIRU-VNTRs for a finer characterization of Mycobacterium tuberculosis strains isolated from patients residing in Guyana (n=74) and Suriname (n=80). The mean age of the patients was 38.5years (36.5 and 40.2years for Guyana vs. Suriname), with a male-to-female sex-ratio of 2.25 for Guyana vs. 4.27 in Suriname. Spoligotyping and 15-loci MIRU-VNTRs led to...

article

Mycobacterium tuberculosis causing tuberculous lymphadenitis in Maputo, Mozambique

Sofia Omar Viegas, Solomon Ghebremichael, Leguesse Massawo, Matos Alberto, more

BMC Microbiology > 2015 > 15 > 1 > 1-10

Background The zoonosis bovine tuberculosis (TB) is known to be responsible for a considerable proportion of extrapulmonary TB. In Mozambique, bovine TB is a recognised problem in cattle, but little has been done to evaluate how Mycobacterium bovis has contributed to human TB. We here explore the public health risk for bovine TB in Maputo, by characterizing the isolates from tuberculous lymphadenitis...

article

Predominance of Uganda genotype of Mycobacterium tuberculosis isolated from Ugandan patients with tuberculous lymphadenitis

Dan Wamala, Moses Okee, Edgar Kigozi, David Couvin, more

BMC Research Notes > 2015 > 8 > 1 > 1-9

Background In Uganda, the emerging Uganda genotype of Mycobacterium tuberculosis is the most common cause of pulmonary tuberculosis (PTB), and accounts for up to 70 % of isolates. Extrapulmonary TB (EPTB) is less studied in Uganda. Methods Molecular characterization using deletion analysis and spoligotyping was performed on 121 M. tuberculosis isolates from lymph node fine needle biopsy aspirates...

article

Snapshot of the genetic diversity of Mycobacterium tuberculosis isolates in Iraq

Mohanad Mohsin Ahmed, Suhad Hadi Mohammed, Hasan A. Abood Nasurallah, Mousa M. Ali, more

International Journal of Mycobacteriology > 2014 > 3 > 3 > 184-196

This study explored the genetic diversity of Mycobacterium tuberculosis isolates in Iraq by spoligotyping and 15-locus-based mycobacterial interspersed repetitive unit-variable number tandem repeat (MIRU-VNTR) methods. Initially, 270 isolates from 134 patients were collected and then 134 non-duplicating isolates (1 isolate/patient) were subjected to the study analyses, 70 isolates were found to be...

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INFONA - science communication portal

Search results for: Nalin Rastogi

Genetic diversity of Mycobacterium tuberculosis from Pará, Brazil, reveals a higher frequency of ancestral strains than previously reported in South America

Mycobacterium tuberculosis genotypes and predominant clones among the multidrug-resistant isolates in Spain 1998–2005

Molecular epidemiology of Mycobacterium tuberculosis in Baja California, Mexico: A result of human migration?

Comparative study of genotypes of Mycobacterium tuberculosis from a Northern Indian setting with strains reported from other parts of India and neighboring countries

SpolSimilaritySearch – A web tool to compare and search similarities between spoligotypes of Mycobacterium tuberculosis complex

New Mycobacterium tuberculosis LAM sublineage with geographical specificity for the Old World revealed by phylogenetical and Bayesian analyses

A snapshot of the predominant single nucleotide polymorphism cluster groups of Mycobacterium tuberculosis clinical isolates in Delhi, India

Genetic diversity of Mycobacterium tuberculosis complex strains isolated from patients with pulmonary tuberculosis in Anambra State, Nigeria

First insight into the molecular epidemiology of Mycobacterium tuberculosis in Santa Catarina, southern Brazil

Characterization of mutations in streptomycin-resistant Mycobacterium tuberculosis isolates in Sichuan, China and the association between Beijing-lineage and dual-mutation in gidB

Human multidrug-resistant Mycobacterium bovis infection in Mexico

Mycobacterium tuberculosis polyclonal infections and microevolution identified by MIRU-VNTRs in an epidemiological study

Prevalence of Latin-American-Mediterranean genetic family in population structure of Mycobacterium tuberculosis in Bulgaria

Tuberculosis – A global emergency: Tools and methods to monitor, understand, and control the epidemic with specific example of the Beijing lineage

Phylogenetic associations with demographic, epidemiological and drug resistance characteristics of Mycobacterium tuberculosis lineages in the SITVIT2 database: Macro- and micro-geographical cleavages and phylogeographical specificities

Molecular epidemiology and evolutionary genetics of Mycobacterium tuberculosis isolated from different parts of India

Finer characterization of Mycobacterium tuberculosis using spoligotyping and 15-loci MIRU-VNTRs reveals phylogeographical specificities of isolates circulating in Guyana and Suriname

Mycobacterium tuberculosis causing tuberculous lymphadenitis in Maputo, Mozambique

Predominance of Uganda genotype of Mycobacterium tuberculosis isolated from Ugandan patients with tuberculous lymphadenitis

Snapshot of the genetic diversity of Mycobacterium tuberculosis isolates in Iraq

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