Current Projects

RePORT-BR supplement (CCASAnet-IeDEA)

Project aims, partnerships and timelines:Provides support for cohort infrastructure: personnel, equipment, supplies, data management, specimen biorepository, microbiology laboratories, and immunology laboratories. All RePORT-Brazil sites are involved. Supplements are annual.
Principal Investigators:Timothy Sterling, M.D., Valeria Rolla, M.D., Ph.D., Bruno Bezerril Andrade, M.D., Ph.D

Mapping M. tuberculosis transmission hotspots using patient location history

Background:Mapping hotspots for transmission of infectious diseases can offer great help in controlling outbreaks and eliminating reservoirs of infection. Usually, hospital staff in endemic areas try to determine such places by asking patients with transmissible infections, those places where they live/work (for diseases which require chronic exposure) or visited a few days prior going to the hospital (for acute diseases). However, information obtained through questionnaires are generally vague, inaccurate and not integrated into databases. This makes the process manual, slow, and of little value for large-scale epidemiologic studies. Since a significant portion of the population has mobile phones with GPS, the objective of this project is to improve the accuracy and organization of M. tuberculosis infection networks, and to study the temporal dynamics of geolocalization data collected from TB patients. We are developing an online tool in which patients who arrive at the referral centers can voluntarily provide GPS data of their mobile phones. User data will be anonymized, processed and sent to a secure server. By analyzing the location patterns of hundreds of patients during several months prior the clinical visit, we will be able to potentially map hotspots of M. tuberculosis transmission.
Primary aims:
To use location history data from TB patients and their close contacts to find regions with a high risk of disease transmission. And to develop a web application to collect location history data from those patients diagnosed with TB and their close contacts, and implement a data analysis pipeline for finding the disease hotspots
Current status: Participants are currently being recruited at all RePORT-Brazil sites.
Principal Investigators:Helder Nakaya, Ph.D., Bruno Andrade, M.D., Ph.D.

Prospective profiling of eicosanoid and inflammatory balance in TB-diabetes

Background:This study utilizes specimens only from Salvador, Brazil and South Africa. Associations between the eicosanoid balance and TB clinical outcomes were further demonstrated in patients with pulmonary TB in an exploratory study from our group. A longitudinal multi-site study simultaneously quantifying several eicosanoids is needed to evaluate whether eicosanoid balance reflects TB disease activity and if/how this balance is influenced by HIV and/or DM.
Primary aims:To define the clinical characteristics of individuals with TB and/or DM and/or HIV in Brazil and South Africa; To determine whether co-morbid DM is associated with qualitatively or quantitatively distinct eicosanoid profiles in patients with TB and/or TB-HIV; and to determine whether co-morbid DM is associated with qualitative or quantitative differences in the resolution of perturbed eicosanoid profile during and after ATT in patients with TB and/or TB-HIV.
Current status:After obtaining the protocol approval by the IRBs from South Africa, Brazil, and Vanderbilt University Medical Center (VUMC), the study sites finalized patient recruitment. We also received approval of a Materials Transfer Agreement (MTA) that allowed shipment of biospecimens from Brazil and South Africa to Vanderbilt. An export permit was also required to ship the specimens from South Africa to VUMC. In addition, the SOPs of the laboratory assays were also finalized. The lipidomic assays were completed. Preliminary results have been analyzed and presented in a recent meeting of RePORT-South Africa consortium (May 2019). Plasma specimens from cohort A (TB patients with or without diabetes) were successfully shipped from South Africa to Brazil for the Luminex assays. Additional analysis (insulin measurement) will be done in 2020.
Principal Investigators:Bruno Andrade, M.D., Ph.D., Timothy Sterling, M.D., Henrique Serezani, Ph.D., John Koethe, M.D., M.S.C.I., Alisdair Leslie, Ph.D.

Cross-RePORT TB-Diabetes transcriptomic signatures

Background:Evaluation of transcriptomic signatures in persons with TB, TB/DM. This study is in collaboration with sites in India and South Africa. This will likely utilize specimens from all RePORT-Brazil sites.
Primary aims:This project will use peripheral blood samples collected in RNA storage tubes by the RePORT studies in Brazil, South Africa and India. The samples will be used for RNA sequencing to investigate the transcriptomic profile of TB patients with and without comorbid diabetes.
Current status:RNA samples extracted from participants´ specimens in Brazil were sent to India for the transcriptomic analysis. Results from the Brazilian samples were generated and are being now harmonized with the other RePORT consortia.
Principal Investigators:Hardy Kornfeld, M.D., Bruno Andrade, M.D., Ph.D., Amita Gupta, M.D.

Validation of transcriptional signature to predict active TB disease among advanced HIV patients

Background:Evaluation of transcriptomic signatures in advanced HIV, and TB/HIV. This is in collaboration with RePORT-India. This will utilize specimens only from the INI and FMT Brazil sites.
Primary aims:To conduct testing and validation of the 15-gene signature to predict active TB disease among advanced HIV patients with CD4 <100 cells/ ul; and to assess and compare the cytokine/chemokine signature that may be predictive for active TB among advanced TB-HIV and HIV patients in India and Brazil.
Current status:IRB approvals in Brazil were received and all patients were recruited. Samples were collected and stored. Luminex supplies are being purchased, so that Dr. Andrade´s team can process the samples.
Principal Investigators:Valeria Rolla, M.D., Ph.D., Marcelo Cordeiro dos Santos, M.D., Ph.D., Vidya Mave, M.D., Ph.D.

TB/HIV: Predictors of treatment toxicity, failure, and relapse in HIV related TB

Background:This study will evaluate pharmacogenomic predictors of TB/HIV treatment toxicity, and TB treatment outcomes (e.g., 2-month culture conversion and failure/relapse). All RePORT-Brazil study sites are enrolling participants.
Primary aims:To identify pharmacogenomic predictors of TB/HIV plasma drug exposure and increased risk for toxicity during TB therapy; and to determine the pharmacogenomic predictors of two month culture-positivity, and TB treatment failure and relapse, while accounting for host and M. tuberculosis pathogen factors.
Current status:All participants have been enrolled through RePORT-Brazil. An MTA was established so that the Biorepository in Brazil could ship the DNA and plasma samples to Vanderbilt (for genotyping and PK work, in which the assay to measure several TB and HIV drugs has been already developed). The ancestry informative markers (AIMs) evaluation is 100% complete and was done in Brazil (Dr. Santos´ lab).
Principal Investigators:

Timothy Sterling, M.D., Valeria Rolla, M.D., Ph.D, David Haas, M.D.

Predictors of mechanisms of emergence of drug resistance in MDR-TB (PREEMPT)

Background:This study will evaluate predictors of the emergence of resistance to drugs such as the fluoroquinolones among persons treated for MDR-TB. This study will enroll participants only from the INI and Federal University sites in Rio de Janeiro.
Primary aims:Determine whether low serum antimycobacterial drug concentrations are associated with the clinical emergence of drug resistance in MDR-TB patients; Determine whether HIV seropositivity is a risk factor for low serum drug concentrations; Determine the contribution of increased DNA mutation to clinical emergence of drug resistance in patient isolates; and to Determine the earliest time at which mutations responsible for drug resistance can be detected during treatment.
Current status:Both Brazil and India sites are actively enrolling patients. Enrollment in Brazil started in July 2019 and is expected to last 2 year (target of 100 patients), with a follow up time of 12 months after the last patient recruited completes his/her treatment.
Principal Investigators:Robert Horsburgh, M.D., Timothy Sterling, M.D., Valeria Rolla, M.D., Ph.D., Afranio Kritski, M.D., Ph.D., Cristina Lourenço, Pharm.

Towards a global TB biomarker: Comparison of small transcriptomic signatures to predict, diagnose and monitor TB disease in Brazil and South Africa

Background:This study aims to determine the prognostic and diagnostic performance of a 6-gene signature as well as five previously published small TB signatures in a Brazilian cohort of close contacts, which is part of the RePORT Brazil study; and monitor treatment response in a cohort of Brazilian adults with prevalent TB undergoing treatment.
Primary aims:To determine and compare the prognostic performance of 6 small transcriptomic signatures for predicting risk of developing active TB disease in a Brazilian cohort of close contacts of persons with culture-confirmed TB; To determine and compare the diagnostic performance of 6 small transcriptomic signatures for distinguishing active TB disease cases in Brazil from their close contacts with no signs or symptoms of disease; and to determine and compare the performance of 6 small transcriptomic signatures for monitoring TB treatment response in a Brazilian cohort of culture-confirmed active TB cases undergoing TB treatment.
Current status:Participants have been enrolled in Brazil through the RePORT protocol. Currently, 20 close-contacts have developed active TB. Evaluation of their samples is ongoing and we expect to have at least a few more progressors in the next 12 months.
Principal Investigators:Bruno Andrade, M.D., Ph.D.,  Stanley Mbandi, Ph.D., Timothy Sterling, M.D.

Immunogenetic risk factors for Incipient and Active Tuberculosis

Background:The mechanisms and contribution of host genetic, immunologic, and epidemiologic factors to protection and predisposition to TB are poorly understood. To address that, we will utilize data and specimens collected in RePORT-Brazil, from ~2,000 close contacts of TB cases. We will complete 2 years of follow-up of all close contacts to identify those who progress to culture-confirmed TB disease (N=40 total) and those at risk for incipient TB. This prospective study design will enable us to examine our primary hypothesis that there are immunogenetic pathophysiologic underpinnings of progressing to active TB (1°endpoint) and incipient TB (2° endpoint), and these variables, together with epidemiologic factors such as HIV, will improve predicting progression to TB disease.
Primary aims:To determine which macrophage genes and variants are associated with protection against and risk of TB disease and incipient TB, and regulate anti-microbial mechanisms; to identify the M. tuberculosis antigen-specific T-cell responses associated with protection against and risk of TB disease and incipient TB; and to develop predictive models that determine the relative contribution of genetic, immunologic, transcriptomic, and epidemiologic factors for protection against and risk of TB disease and incipient TB in a cohort of close contacts of culture-confirmed TB in Brazil.
Current status:An award was received mid-June 2019. Protocol was finalized and was submitted to the IRBs at Vanderbilt University Medical center, RePORT-Brazil sites, Washington University and University of Cape Town.
Principal Investigators:Timothy Sterling, M.D., Thomas Hawn, Ph.D., Bruno Andrade, M.D., Ph.D.

Characterization of Genomics and Metabolomics among Individuals Highly-Exposed, but Resistant to Mtb infection

Background:We will carefully measure exposure among household and close contacts to identify a cohort of persons who remain uninfected despite a high degree of exposure. We will then characterize genetic and metabolic factors associated with resistance. These data will inform our understanding of host factors that confer resistance, which will, in turn, inform the development of preventive therapeutics such as a TB vaccine.
Primary aims:To characterize a phenotype for resistance to Mtb infection using TST and IGRA results among household and close contacts recently exposed to TB; To determine genetic predictors for resistance to Mtb infection; and to identify metabolomic markers associated with resistance to Mtb infection.
Current status:RePORT-Brazil sites and Vanderbilt University Medical Center were added after the award was made. The Notice of Award was updated, so that these sites could be included. Protocol was submitted to the local IRB in Brazil and has been approved in May 2020. Approximately 2,000 close contacts will be re-consented so data and specimens can be used for this study.
Principal Investigators:Neel Gandhi, Ph.D., Yan Sun, Ph.D , Timothy Sterling, M.D., Bruno Andrade, M.D, Ph.D, Amita Gupta, Ph.D.

Macrophage Immunogenetics and Incipient Tuberculosis in Brazil 

Background:The mechanisms and relative contribution of host genetic, immunologic, and epidemiologic factors to protection and predisposition to TB are poorly understood. Recent studies reported a host peripheral blood correlate of risk (COR) transcriptional signature that identified individuals at risk for incipient TB (asymptomatic) who progress to develop active (symptomatic) TB disease within 12 months in the absence of treatment. Signatures such as COR are transforming our understanding of the progression from Mtb infection to TB disease.
Primary aims:To utilize signatures such as COR to address current knowledge gaps in the immunogenetic basis of incipient TB and progression to disease.
Current status:An award was received in June 2019. Currently, a protocol was finalized and submitted to the IRBs in Brazil and Vanderbilt. Participants will be re-consented to that data and specimens can be used for this specific project.
Principal Investigators:Thomas Hawn, Ph.D., Timothy Sterling, M.D., Bruno Andrade, M.D., Ph.D.

Prospective, Multicentre Trial to Assess the Diagnostic Accuracy of the Truenat Assays at Intended Settings of Use

Background:The Truenat MTB (including both MTB and MTB plus) and the MTB-RIF Dx reflex assays (Molbio Diagnostics; Bangalore, India) utilize chip-based real-time micro PCR for detection of tuberculosis (TB) and rifampicin (RIF) resistance from DNA extracted from sputum samples in about 25 minutes. A pilot trial conducted in India of the Truenat MTB assay found the assay to achieve high clinical performance. However, further evidence of the Truenat MTB as well as the Truenat MTB-RIF Dx assay, is needed prior to recommending the clinical use of the assays.
Primary aims:To determine the diagnostic accuracy of the Truenat MTB assays and MTB-RIF Dx assay using culture and phenotypic/genotypic drug susceptibility test (DST) as gold standard in the intended setting of use.
Current status:The study protocol has been approved by the IRBs in Brazil. Equipment is being imported with the support of the Brazilian government from Molbio. Staff training and enrollment are expected to begin in August and September 2020, respectively.
Principal Investigators:

Adam Penn-Nicholson (FIND, Switzerland), Afranio Kritski, M.D., Ph.D. (sites in RePORT-Brazil); Sites in RePORT-India; Other sites in Peru, Ethiopia and Papua New Guinea.

Evaluation of microvirin-based point-of-care diagnostic tests for tuberculosis

Background:Biomarker detection tests, such as enzyme-linked immunosorbent assays (ELISAs) and lateral flow assays (LFAs), are inexpensive and can be performed with minimal equipment. LFAs are particularly advantageous as they can provide results rapidly at the point-of-care (POC). The most commonly detected biomarker for TB is lipoarabinomannan (LAM). Currently, the only commercially-available LFA for LAM is the Alere LFA, which detects LAM in urine – a noninvasive, low biohazard risk sample method.  However, due to low sensitivity, the Alere LFA is only approved for use in HIV-positive individuals as immunocompromised individuals have higher concentrations of LAM in urine. With increased sensitivity, an LFA could detect LAM in all individuals, regardless of immune status. Such an LFA would be an important advance in TB diagnostic tests, given its rapid turn-around-time and low-cost.
Microvirin (MVN) is a lectin with a high affinity for alpha-1,2-mannose linkages, which are present in the endcaps of M.tb LAM. Using bio-layer interferometry, we have studied the binding of MVN to LAM and found the interaction to be of equivalent strength or stronger than the binding of LAM to anti-LAM antibodies. Furthermore, MVN has enhanced specificity for M. tb. Anti-LAM antibodies bind to the LAM backbone, which is common to LAM from all species of mycobacteria. In contrast, MVN binds to the endcaps of LAM, which vary according to the species of Mycobacterium. Thus, using MVN as a molecular recognition element to detect LAM in an LFA for diagnosis of TB would potentially result in a more sensitive and specific test compared to traditional LAM biomarker detection tests that utilize antibodies, while maintaining the speed and low cost that make LFAs so promising.
Primary aim:The purpose of this study is to evaluate the clinical performance of two diagnostic tests for TB: an on-bead ELISA and a lateral flow assay. Both tests use MVN to capture and detect LAM, a biomarker for TB, in urine.
Current status:The study protocol has been approved by the IRBs in Brazil and participants are being re-consented, so that data and specimens can be used for this specific project.
Principal Investigators:David Wright, Ph.D., Megan van der Horst, Valeria Rolla, M.D., Ph.D, Adriano Gomes, Ph.D, Timothy Sterling, M.D.