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Sales ACDS, Lopes LA, Vale MCDS, Costa MF, Lima JVDS, Silva JGMD, Ferreira BSDC, Nascimento VAD, Flor SEDS, Sousa ELCD, Paz BKB, Garcia RADS, Sousa EMD, Santos AFD, Silva LCND, Zagmignan A. Clinical Features, Biochemical Parameters, and Treatment Adherence of Individuals Who Started the Treatment for Active Pulmonary Tuberculosis during the Pandemic Period. J Clin Med 2023; 12:4843. [PMID: 37510958 PMCID: PMC10381187 DOI: 10.3390/jcm12144843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 05/25/2023] [Accepted: 05/26/2023] [Indexed: 07/30/2023] Open
Abstract
This descriptive prospective study investigated the clinical features and treatment adherence of individuals who started the treatment for Pulmonary tuberculosis (TB) during the COVID-19 pandemic in São Luís. Thirty-six TB patients and thirty-five age/sex-matched individuals were recruited between January 2021 and January 2022. The clinical features, sociodemographic information, and serum were obtained at the diagnosis time. Adherence to treatment and adverse reactions were investigated monthly. The most common symptoms in TB patients were cough (91.6%) and fever (83.3%). All TB patients had elevated pre-therapy levels of CRP and reduced HDL: 88.9% presented hypocalcemia and 47.2% showed elevated ALP and GGT. TB patients showed higher levels of ALT, AST, ALP, GGT, CRP, amylase, and triglycerides than the comparison group (p < 0.05), while the calcium levels were reduced (p < 0.0001). TB patients with anti-SARS-CoV-2-IgG antibodies (seroprevalence of 66.7%) presented higher values of amylase and lower CRP levels (p < 0.05). Most patients (~70%) reported at least one adverse drug reaction, mainly pruritus and nausea. The treatment abandonment rate was 19.2%. In conclusion, TB patients showed elevated pre-therapy levels of CRP, low levels of HDL, and hypocalcemia. Liver and pancreatic functions were also compromised in several patients before the therapy. The treatment non-adherence rate observed was similar to other studies performed before the pandemic period.
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Affiliation(s)
- Amanda Caroline de Souza Sales
- Laboratory of Microbial Pathogenesis, CEUMA University, São Luís 65075-120, MA, Brazil
- Postgraduate Program in Microbial Biology, CEUMA University, São Luís 65075-120, MA, Brazil
- Laboratory of Clinical Analysis (LABORCEUMA), CEUMA University, São Luís 65075-120, MA, Brazil
| | - Larissa Araújo Lopes
- Laboratory of Microbial Pathogenesis, CEUMA University, São Luís 65075-120, MA, Brazil
| | | | - Mayara Ferreira Costa
- Laboratory of Microbial Pathogenesis, CEUMA University, São Luís 65075-120, MA, Brazil
| | - João Victor de Souza Lima
- Laboratory of Microbial Pathogenesis, CEUMA University, São Luís 65075-120, MA, Brazil
- Postgraduate Program in Microbial Biology, CEUMA University, São Luís 65075-120, MA, Brazil
| | | | | | | | | | | | | | | | - Eduardo Martins de Sousa
- Postgraduate Program in Microbial Biology, CEUMA University, São Luís 65075-120, MA, Brazil
- Postgraduate Program in Health and Services Management, CEUMA University, São Luís 65075-120, MA, Brazil
- Laboratory of Immunology and Microbiology of Respiratory Infections, CEUMA University, São Luís 65075-120, MA, Brazil
| | | | - Luís Cláudio Nascimento da Silva
- Laboratory of Microbial Pathogenesis, CEUMA University, São Luís 65075-120, MA, Brazil
- Postgraduate Program in Microbial Biology, CEUMA University, São Luís 65075-120, MA, Brazil
| | - Adrielle Zagmignan
- Laboratory of Microbial Pathogenesis, CEUMA University, São Luís 65075-120, MA, Brazil
- Postgraduate Program in Microbial Biology, CEUMA University, São Luís 65075-120, MA, Brazil
- Postgraduate Program in Health and Services Management, CEUMA University, São Luís 65075-120, MA, Brazil
- Departament of Nutrition, CEUMA University, São Luís 65075-120, MA, Brazil
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Kucukakcali Z, Colak C, Gozukara Bag HG, Balikci Cicek I, Ozhan O, Yildiz A, Danis N, Koc A, Parlakpinar H, Akbulut S. Modeling Based on Ensemble Learning Methods for Detection of Diagnostic Biomarkers from LncRNA Data in Rats Treated with Cis-Platinum-Induced Hepatotoxicity. Diagnostics (Basel) 2023; 13:diagnostics13091583. [PMID: 37174973 PMCID: PMC10177870 DOI: 10.3390/diagnostics13091583] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 04/20/2023] [Accepted: 04/24/2023] [Indexed: 05/15/2023] Open
Abstract
BACKGROUND The first aim of this study is to perform bioinformatic analysis of lncRNAs obtained from liver tissue samples from rats treated with cisplatin hepatotoxicity and without pathology. Another aim is to identify possible biomarkers for the diagnosis/early diagnosis of hepatotoxicity by modeling the data obtained from bioinformatics analysis with ensemble learning methods. METHODS In the study, 20 female Sprague-Dawley rats were divided into a control group and a hepatotoxicity group. Liver samples were taken from rats, and transcriptomic and histopathological analyses were performed. The dataset achieved from the transcriptomic analysis was modeled with ensemble learning methods (stacking, bagging, and boosting). Modeling results were evaluated with accuracy (Acc), balanced accuracy (B-Acc), sensitivity (Se), specificity (Sp), positive predictive value (Ppv), negative predictive value (Npv), and F1 score performance metrics. As a result of the modeling, lncRNAs that could be biomarkers were evaluated with variable importance values. RESULTS According to histopathological and immunohistochemical analyses, a significant increase was observed in the sinusoidal dilatation and Hsp60 immunoreactivity values in the hepatotoxicity group compared to the control group (p < 0.0001). According to the results of the bioinformatics analysis, 589 lncRNAs showed different expressions in the groups. The stacking model had the best classification performance among the applied ensemble learning models. The Acc, B-Acc, Se, Sp, Ppv, Npv, and F1-score values obtained from this model were 90%, 90%, 80%, 100%, 100%, 83.3%, and 88.9%, respectively. lncRNAs with id rna-XR_005492522.1, rna-XR_005492536.1, and rna-XR_005505831.1 with the highest three values according to the variable importance obtained as a result of stacking modeling can be used as predictive biomarker candidates for hepatotoxicity. CONCLUSIONS Among the ensemble algorithms, the stacking technique yielded higher performance results as compared to the bagging and boosting methods on the transcriptomic data. More comprehensive studies can support the possible biomarkers determined due to the research and the decisive results for the diagnosis of drug-induced hepatotoxicity.
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Affiliation(s)
- Zeynep Kucukakcali
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Cemil Colak
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Harika Gozde Gozukara Bag
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Ipek Balikci Cicek
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Onural Ozhan
- Department of Pharmacology, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Azibe Yildiz
- Department of Histology and Embryology, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Nefsun Danis
- Department of Medical Biology and Genetics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Ahmet Koc
- Department of Medical Biology and Genetics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Hakan Parlakpinar
- Department of Pharmacology, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
| | - Sami Akbulut
- Department of Biostatistics and Medical Informatics, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
- Department of Surgery, Faculty of Medicine, Inonu University, 44280 Malatya, Turkey
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Vitale G, Mattiaccio A, Conti A, Berardi S, Vero V, Turco L, Seri M, Morelli MC. Molecular and Clinical Links between Drug-Induced Cholestasis and Familial Intrahepatic Cholestasis. Int J Mol Sci 2023; 24:ijms24065823. [PMID: 36982896 PMCID: PMC10057459 DOI: 10.3390/ijms24065823] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/11/2023] [Accepted: 03/14/2023] [Indexed: 03/30/2023] Open
Abstract
Idiosyncratic Drug-Induced Liver Injury (iDILI) represents an actual health challenge, accounting for more than 40% of hepatitis cases in adults over 50 years and more than 50% of acute fulminant hepatic failure cases. In addition, approximately 30% of iDILI are cholestatic (drug-induced cholestasis (DIC)). The liver's metabolism and clearance of lipophilic drugs depend on their emission into the bile. Therefore, many medications cause cholestasis through their interaction with hepatic transporters. The main canalicular efflux transport proteins include: 1. the bile salt export pump (BSEP) protein (ABCB11); 2. the multidrug resistance protein-2 (MRP2, ABCC2) regulating the bile salts' independent flow by excretion of glutathione; 3. the multidrug resistance-1 protein (MDR1, ABCB1) that transports organic cations; 4. the multidrug resistance-3 protein (MDR3, ABCB4). Two of the most known proteins involved in bile acids' (BAs) metabolism and transport are BSEP and MDR3. BSEP inhibition by drugs leads to reduced BAs' secretion and their retention within hepatocytes, exiting in cholestasis, while mutations in the ABCB4 gene expose the biliary epithelium to the injurious detergent actions of BAs, thus increasing susceptibility to DIC. Herein, we review the leading molecular pathways behind the DIC, the links with the other clinical forms of familial intrahepatic cholestasis, and, finally, the main cholestasis-inducing drugs.
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Affiliation(s)
- Giovanni Vitale
- Internal Medicine Unit for the Treatment of Severe Organ Failure, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- European Reference Network on Hepatological Diseases (ERN RARE-LIVER), 20246 Hamburg, Germany
| | - Alessandro Mattiaccio
- U.O. Genetica Medica, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum-University of Bologna, 40126 Bologna, Italy
| | - Amalia Conti
- U.O. Genetica Medica, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
| | - Sonia Berardi
- Internal Medicine Unit for the Treatment of Severe Organ Failure, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- European Reference Network on Hepatological Diseases (ERN RARE-LIVER), 20246 Hamburg, Germany
| | - Vittoria Vero
- Internal Medicine Unit for the Treatment of Severe Organ Failure, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- European Reference Network on Hepatological Diseases (ERN RARE-LIVER), 20246 Hamburg, Germany
| | - Laura Turco
- Internal Medicine Unit for the Treatment of Severe Organ Failure, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- European Reference Network on Hepatological Diseases (ERN RARE-LIVER), 20246 Hamburg, Germany
| | - Marco Seri
- U.O. Genetica Medica, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum-University of Bologna, 40126 Bologna, Italy
| | - Maria Cristina Morelli
- Internal Medicine Unit for the Treatment of Severe Organ Failure, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy
- European Reference Network on Hepatological Diseases (ERN RARE-LIVER), 20246 Hamburg, Germany
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Chaudhary KR, Puri V, Singh A, Singh C. A review on recent advances in nanomedicines for the treatment of pulmonary tuberculosis. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2021.103069] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Peng W, Zhao ZZ, Jiao L, Wu T, Chen H, Zhang CY, Song JJ, Liu TYH, Wu LJ, Wang MJ, Chen J, Zhou Y, Ying BW. Prospective study of ALDH1A1 gene polymorphisms associated with antituberculosis drug-induced liver injury in western Chinese Han population. Microbiol Immunol 2021; 65:143-153. [PMID: 33527427 DOI: 10.1111/1348-0421.12877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 01/12/2021] [Accepted: 01/25/2021] [Indexed: 02/05/2023]
Abstract
Antituberculosis drug-induced liver injury (ATDILI) has received increasing attention globally, which may limit the effectiveness of antituberculosis (anti-TB) treatment. Many host genetic determinants of ATDILI have been identified recently. As little knowledge is currently available about the association between aldehyde dehydrogenase 1 family member A1 (ALDH1A1) polymorphisms and ATDILI, the association between their variants and the susceptibility to ATDILI was investigated. A total of 747 patients with TB treated by first-line anti-TB drugs were prospectively enrolled at West China Hospital. Genomic DNA was extracted from the peripheral blood sample of each patient and seven single-nucleotide polymorphisms (SNPs) of ALDH1A1 gene were screened and genotyped with a custom-designed 2×48-plex SNP Scan TM kit. The patients were followed up monthly to monitor the development of ATDILI. The C allele and the CA genotype of rs7852860 were significantly associated with an elevated risk for ATDILI (p = .006 and 0.005, respectively), which was consistent with the results in the dominant and additive models. No allele, genotype, or genetic model of the other six SNPs (rs3764435, rs348471, rs63319, rs610529, rs7027604, rs8187876) were found to be associated with susceptibility to ATDILI. The findings first demonstrate that rs7852860 variants in ALDH1A1 gene is associated with susceptibility to ATDILI in the Chinese Han population. Validation studies with larger sample sizes and other ethnic groups are needed to confirm the findings.
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Affiliation(s)
- Wu Peng
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Zhen-Zhen Zhao
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Lin Jiao
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Tao Wu
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Hao Chen
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Chun-Ying Zhang
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Jia-Jia Song
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Tang-Yu-Heng Liu
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Li-Juan Wu
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Min-Jin Wang
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Jie Chen
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Yi Zhou
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Bin-Wu Ying
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
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Maillard M, Chevreau C, Le Louedec F, Cassou M, Delmas C, Gourdain L, Blay JY, Cupissol D, Bompas E, Italiano A, Isambert N, Delcambre-Lair C, Penel N, Bertucci F, Guillemet C, Plenecassagnes J, Foulon S, Chatelut É, Le Cesne A, Thomas F. Pharmacogenetic Study of Trabectedin-Induced Severe Hepatotoxicity in Patients with Advanced Soft Tissue Sarcoma. Cancers (Basel) 2020; 12:E3647. [PMID: 33291741 PMCID: PMC7761985 DOI: 10.3390/cancers12123647] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/02/2020] [Accepted: 12/02/2020] [Indexed: 01/26/2023] Open
Abstract
Hepatotoxicity is an important concern for nearly 40% of the patients treated with trabectedin for advanced soft tissue sarcoma (ASTS). The mechanisms underlying these liver damages have not yet been elucidated but they have been suggested to be related to the production of reactive metabolites. The aim of this pharmacogenetic study was to identify genetic variants of pharmacokinetic genes such as CYP450 and ABC drug transporters that could impair the trabectedin metabolism in hepatocytes. Sixty-three patients with ASTS from the TSAR clinical trial (NCT02672527) were genotyped by next-generation sequencing for 11 genes, and genotype-toxicity association analyses were performed with R package SNPassoc. Among the results, ABCC2 c.1249A allele (rs2273697) and ABCG2 intron variant c.-15994T (rs7699188) were associated with an increased risk of severe cytolysis, whereas ABCC2 c.3563A allele had a protective effect, as well as ABCB1 variants rs2032582 and rs1128503 (p-value < 0.05). Furthermore, CYP3A5*1 rs776746 (c.6986A > G) increased the risk of severe overall hepatotoxicity (p = 0.012, odds ratio (OR) = 5.75), suggesting the implication of metabolites in the hepatotoxicity. However, these results did not remain significant after multiple analysis correction. These findings need to be validated on larger cohorts of patients, with mechanistic studies potentially being able to validate the functional consequences of these variants.
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Affiliation(s)
- Maud Maillard
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Inserm UMR1037, 31059 Toulouse, France; (M.M.); (F.L.L.); (C.D.); (L.G.); (É.C.)
- Université Paul Sabatier—Toulouse III, 31400 Toulouse, France
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Christine Chevreau
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Félicien Le Louedec
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Inserm UMR1037, 31059 Toulouse, France; (M.M.); (F.L.L.); (C.D.); (L.G.); (É.C.)
- Université Paul Sabatier—Toulouse III, 31400 Toulouse, France
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Manon Cassou
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Caroline Delmas
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Inserm UMR1037, 31059 Toulouse, France; (M.M.); (F.L.L.); (C.D.); (L.G.); (É.C.)
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Laure Gourdain
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Inserm UMR1037, 31059 Toulouse, France; (M.M.); (F.L.L.); (C.D.); (L.G.); (É.C.)
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Jean-Yves Blay
- Medical Oncology Department, Centre Léon Bérard, 69008 Lyon, France;
| | - Didier Cupissol
- Medical Oncology Department, Institut Régional du Cancer Val d’Aurelle, 34090 Montpellier, France;
| | - Emmanuelle Bompas
- Medical Oncology Department, Institut de Cancérologie de l’Ouest, 44800 Saint-Herblain, France;
| | - Antoine Italiano
- Medical Oncology Department, Institut Bergonié, 33000 Bordeaux, France;
| | - Nicolas Isambert
- Medical Oncology Department, Centre Georges François Leclerc, 21000 Dijon, France;
| | | | - Nicolas Penel
- Medical Oncology Department, Centre Oscar Lambret—Université de Lille, 59000 Lille, France;
| | - François Bertucci
- Medical Oncology Department, Institut Paoli-Calmettes, 13009 Marseille, France;
| | - Cécile Guillemet
- Medical Oncology Department, Centre Henri Becquerel, 76038 Rouen, France;
| | - Julien Plenecassagnes
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Stéphanie Foulon
- Department of Biostatistics and Epidemiology, Gustave Roussy, University Paris-Saclay, 94805 Villejuif, France;
- Oncostat U1018, Inserm, University Paris-Saclay, Labeled Ligue Contre le Cancer, 94805 Villejuif, France
| | - Étienne Chatelut
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Inserm UMR1037, 31059 Toulouse, France; (M.M.); (F.L.L.); (C.D.); (L.G.); (É.C.)
- Université Paul Sabatier—Toulouse III, 31400 Toulouse, France
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
| | - Axel Le Cesne
- Medical Oncology Department, Gustave Roussy, 94805 Villejuif, France;
| | - Fabienne Thomas
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Inserm UMR1037, 31059 Toulouse, France; (M.M.); (F.L.L.); (C.D.); (L.G.); (É.C.)
- Université Paul Sabatier—Toulouse III, 31400 Toulouse, France
- Institut Claudius Regaud, Institut Universitaire du Cancer (IUCT)—Oncopole, 31059 Toulouse, France; (C.C.); (M.C.); (J.P.)
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Human global and population-specific genetic susceptibility to Mycobacterium tuberculosis infection and disease. Curr Opin Pulm Med 2020; 26:302-310. [PMID: 32101905 DOI: 10.1097/mcp.0000000000000672] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
PURPOSE OF REVIEW Multiple lines of evidence support a role of the host genetic component in Mycobacterium tuberculosis infection and disease progression. However, genomic studies of tuberculosis susceptibility have been disappointing compared with that of other complex disorders. Recently the field has explored alternative strategies to facilitate locus discovery. Results emanating from these efforts during the last 18 months are addressed in this review. RECENT FINDINGS There has been a renewed focus on the refinement of phenotypic definitions of infection and disease as well as on age-related, sex-specific and population-specific effects. Genome-wide association studies have yielded candidate genes but the findings have not always been transferable to all population groups. Candidate gene association studies remain popular as it is used for GWAS replication and is affordable, particularly in lower and middle-income countries. Pharmacogenetic studies involving tuberculosis drugs may locate variants that can be cost-effectively genotyped to identify individuals at risk of developing adverse events during treatment. SUMMARY Additional GWAS and candidate gene association studies of crudely defined study participants are unlikely to make further important contributions to the TB susceptibility field. Instead refined phenotyping will allow the elucidation of genetic mechanisms contributing to infection and disease in distinct populations and the calculation of polygenic risk scores.
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