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Genetic variation of ABCB1 (rs1128503, rs1045642) and CYP2E1 rs3813867 with the duration of tuberculosis therapy: a pilot study among tuberculosis patients in Indonesia



The risk of contracting tuberculosis (TB) and the efficacy of TB therapy are affected by several factors, including genetic variation among populations. In the Indonesian population, data on the genes involved in drug transport and metabolism of TB therapy are limited. The aim of this study was to identify the genetic profile of the ABCB1 gene (rs1128503 and rs1045642) and CYP2E1 gene (rs3813867) in Indonesians with TB. This study was a cross-sectional study of 50 TB outpatients in Jambi city, Indonesia. Sociodemographic characteristics were obtained from medical records. Whole blood was collected, and genomic DNA was isolated. Single nucleotide polymorphisms were determined using polymerase chain reaction-restriction fragment length polymorphism with HaeIII, MboI, and PstI for rs1128503, rs1045642 (ABCB1), and rs3813867 (CYP2E1), respectively.


The frequency of alleles of each gene was analyzed by Hardy–Weinberg equilibrium. The genetic profiles of ABCB1 rs1128503 and rs1045642 were varied (CC, CT, TT), while CYP2E1 rs3813867 was present in CC (wild type). The genetic variations of ABCB1 and CYP2E1 may have no significant correlation with the duration of TB therapy. Nevertheless, this study may provide as preliminary results for the genetic profiles of ABCB1 (rs1128503, rs1045642) and CYP2E1 (rs3813867) in the Indonesia population.


Tuberculosis (TB) is an infectious disease with a high mortality rate. TB is caused by Mycobacterium tuberculosis (M. tuberculosis) that mainly invades the lung. Indonesia has a pulmonary TB prevalence of 0.42% (1,017,290 cases), and in 2018, the incidence rate was 316 cases per 100,000 population, making the country third highest in the world for TB [1, 2]. Moreover, TB resistant to rifampicin or multiple drug resistant tuberculosis (MDR-TB) is a serious threat. In 2018, there were 24,000 cases of MDR-TB in Indonesia [2].

First-line TB therapy is an adequate strategy for TB-sensitive cases; a combination of rifampicin, isoniazid, pyrazinamide, and ethambutol (2-month intensive phase) is continued with rifampicin and isoniazid for 4 months. These regimens are strongly recommended for countries with a high incidence of MDR-TB [3,4,5]. Strategies of TB eradication focus on monitoring therapy and comprehensive patient care; however, the efficacy of therapy still presents challenges, especially in developing countries [6, 7]. Current TB therapy achieves > 95% cure and < 5% relapse rates, but a small proportion of patients are not responsive to the therapy [8]. Factors affecting the efficacy of TB therapy include the host and bacteria. Genetic variations among individuals are known to affect the efficacy and toxicity of therapy [9]. Single nucleotide polymorphisms (SNPs) of genes involved in the metabolism or uptake of TB drugs show correlations with efficacy, such as the cytochrome P-450 (CYP) family and adenosine triphosphate (ATP)-binding cassette (ABC) family [10,11,12]. Alterations in these genes may influence the pharmacokinetics, sensitivity, or adverse reactions to drugs [13].

Adenosine triphosphate (ATP)-binding cassette B1 (ABCB1) is a membrane transporter, which is encoded by the ABCB1 gene, plays an important role in ATP-dependent uptake and efflux of extracellular compounds and xenobiotics into and from cells [10, 14, 15]. Therefore, polymorphisms of ABCB1 determine the risk factor, efficacy, and toxicity of some therapies. ABCB1 gene C1236T (rs1128503) and/or C3435T (rs1045642) are involved in diseases such as TB, cancer, minor ischemic stroke, chronic liver disease, and mental health [14, 16,17,18,19,20,21,22,23,24]. The adverse effect of TB therapy is significantly correlated with hepatotoxicity [25,26,27]. Cytochrome P-450 2E1 (CYP2E1) encoded by the CYP2E1 gene, is mainly expressed in the liver, and catalyze xenobiotic metabolism. CYP2E1 is involved in isoniazid metabolism, and its activity and expression are affected by polymorphisms of CYP2E1 gene in the 5ʹ upstream region (−1053C>T) [9, 28,29,30,31,32].

It is important to understand whether genetic variation is one of the risk factors for TB and severity progression. The present study was the first study to identify the genetic profile of the ABCB1 gene (rs1128503 and rs1045642) and CYP2E1 gene (rs3813867) of TB patients in Jambi city, Indonesia.

Main text



This study was a cross-sectional study of TB outpatients in Abdul Manap Hospital, Jambi city, Indonesia. Fifty patients were examined to observe the SNPs of ABCB1 (rs1128503 and rs1045642) and CYP2E1 (rs3813867). The sample collection was conducted for 3 months. The population (male and female) that met the inclusion criteria, such as patients diagnosed with TB and currently undergoing TB therapy, was selected. The sociodemographic characteristics (age, gender, education, and occupation), duration of therapy, therapy category, smoking status, and alcohol consumption were obtained from medical records.

Genotyping of ABCB1 (rs1128503 and rs1045642) and CYP2E1 (rs3813867)

The gene sequences were obtained from The National Center for Biotechnology Information ( Whole blood was collected and genomic DNA was isolated using Purelink Genomic DNA Mini Kit (Thermo Fischer Scientific, Waltham, MA, USA). SNP identification was determined using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. PCR was conducted by PCR SuperMix (Thermo Fisher Scientific, Waltham, MA, USA) using specific primers for each SNP. All specific primer (Invitrogen, Thermo Fisher Scientific, Waltham, MA, USA) sequences were obtained from previous studies [18, 33]. Each specific primer was confirmed with GENETYX version 10 software and Oligo Calc: Oligonucleotide Properties Calculator ( (Additional file 1: Table S1). PCR products were digested with MboI, HaeIII, or PstI (Promega, Madison, WI, USA), electrophoresed using 2.5% agarose gel containing SYBR® Safe DNA Gel Stain (Thermo Fischer Scientific, Waltham, MA, USA), and visualized under ultraviolet light at 312 nm. The MboI-digested PCR fragment (ABCB1 rs1045642) produced 88- and 162-bp for CC (wild-type); 88-, 162-, and 250-bp for CT; 250-bp for TT. HaeIII digested PCR fragments (ABCB1 rs1128503) produced 270-, 65-, and 35-bp for CC (wild-type); 270-, 100-, 65-, and 35-bp for CT; 270- and 100-bp for TT. The PstI digested PCR fragment (CYP2E1 rs3813867) produced: 412-bp for CC (wild-type), 118-, 294-, and 412-bp for CT, and 294-, and 412-bp for TT. GAPDH gene expression was used as an internal PCR control in the same samples.

Statistical analysis

Each locus was analyzed for allele frequencies using descriptive statistics with Hardy–Weinberg equilibrium (HWE, df = 1). Statistically significant differences in sociodemographic characteristics were analyzed using Student’s t-test with p < 0.05 considered as statistically significant. The correlation between sociodemographic characteristic and duration of therapy was analyzed by Chi-square or Fisher exact test univariate analysis.


Sociodemographics of TB patients

TB patients in Jambi city were mostly males of productive age (40 years old of age or younger) (Table 1; Additional file 2: Figure S1 and Additional file 3: Figure S2). Most had graduated from senior high school and were either housewives or industrial laborers. Smoking and alcohol consumption status were only observed in only 16% and 6% of patients, respectively.

Table 1 Correlation of sociodemographic characteristics with duration of therapy (n = 50)

Genotyping of ABCB1 (rs1128503 and rs1045642) and CYP2E1 (rs3813867)

All samples were clearly identified by the RFLP method, but 17 samples were not identified for ABCB1 rs1128503 (RFLP by HaeIII) (Table 1, Fig. 1). Results showed that the genetic profiles of ABCB1 rs1128503 were 7 (14%) CC, 14 (28%) CT, 12 (24%) TT, and 17 (34%) were not identified; ABCB1 rs1045642 was 9 (18%) CC, 25 (50%) CT, and 16 (32%) TT. The T allele of both SNPs in ABCB1 showed higher frequency than the C allele (Table 1). The CYP2E1 rs3813867 was all observed in the CC (wild type) genotype (Additional file 4: Figure S3). Otherwise, the allele frequency of each genotype of all SNPs was not significant in the disequilibrium state, with p > 0.05 according to the Hardy–Weinberg equation (Additional file 5: Table S2; Additional file 6: Table S3; Additional file 7: Table S4).

Fig. 1
figure 1

Visualization of a ABCB1 rs1128503, b ABCB1 rs1045642, and c CYP2E1 rs3813867 using agarose gel electrophoresis

Duration of therapy and genetic variation

Most of patients were in first line therapy for TB (< 6 months of therapy), but 1 patient was in the extensive phase, and 4 patients were confirmed to have MDR-TB (> 6 months of therapy) (Table 1). All of the sociodemographic determinants were not significantly correlated with the duration of therapy (p > 0.05). The genotype of ABCB1 (rs1045642 or rs1128503) showed variations rather than continuing for correlation analysis with duration of therapy. The variations in ABCB1 were divided into the C allele (CC, wild-type) and T allele (CT, TT) but showed no significant correlation with the duration of TB therapy (Table 1).


Sociodemography characteristics are considered as risk factors for TB and MDR-TB incidence [34]. Our results showed that TB cases were higher in men, similar to most studies in Malaysia [35]. Active TB cases are shown to affect individuals of productive age, as shown in a Java island, Indonesia study [35,36,37,38]. However, we observed 17 patients who were less than 40 years of age and 33 who were more than 40 years old. Jambi city is located on Sumatera Island and might have different sociodemographic characteristics, including various ethnicities, from other parts of Indonesia.

Educational background is one TB determinants. A lower level of education correlated with a higher TB infection rate [35, 39]. Similarly, our data showed that 48 out of 50 patients had at least a senior high school educational. Lower educational background was assumed to have less exposure to health information; however this assumption has not been proven since TB-related health information can also be accessed by those with informal education [35, 40]. In the present study, most TB patients were employed. In Malaysia, employment status as a determinant of TB infection was showed that patients who were unemployed completed TB therapy at higher rates [35]. Our result was similar to a study in Kenya [41]. Productive age and employed status of individuals are risk factors for TB infection because of high mobility and the increased likelihood of being exposed to TB [35, 42]. Behavioral factors, such as smoking status, alcohol consumption, and drug abuse, made individuals more susceptible to TB infection, thus affecting the incidence of active TB [43, 44]. We observed that only 16 patients smoked and 6 patients consumed alcohol. This might indicate that other factors affect the incidence of TB in Indonesia, especially in Jambi Province. Because the majority of Indonesians are Muslim, alcohol consumption is prohibited. Due to data limitations, we cannot statistically calculate the correlation of such sociodemographic characteristics with TB infection.

ABCB1 is involved in diseases and the efficacy of therapy, where SNPs in the ABCB1 gene affect its function. Polymorphisms of ABCB1 rs1128503 and rs1045642 are the most studied variants genetic of ABCB1 in diseases and indicate high frequencies in several populations [45, 46]. This was the first genotype variation study of ABCB1 in Indonesian TB patients, especially in the Jambi population, although we did not find a significant association with sociodemography characteristics or duration of therapy. We did find a higher number of T alleles in both polymorphisms of ABCB1. T alleles of ABCB1 rs1128503 are major alleles in Asia and minor alleles in Africa [14]. Both polymorphisms of ABCB1 rs1045642 and rs1128503 are synonymous SNPs, but they alter the stability of mRNA expression; therefore, they affect the drug pharmacokinetics, whether through reduced or increased drug bioavailability. An ABCB1 genotype study in Brazil showed that SNP rs1128503 had a significant correlation with the risk for MDR-TB. One of the limitations of our study was that we did not correlate the genetic variation with clinical outcomes or efficacy of therapy due to a lack of data. However, this study may become a preliminary study to identify the genetic profile of ABCB1 rs1128503 (C1236T) and rs1045642 (C3435T) in Indonesia, especially in Jambi Province.

In the present study, all samples had the wild-type (CC) genotype; therefore we could not analyze the correlation with sociodemographic characteristics and duration of therapy. The variation in the CYP2E1 rs3813867 genotype in Malaysia (Asian and non-Asian) and in Turkey showed similar results to our study [47, 48]. The activity of CYP2E1 was isoniazid level-dependent and involved in acetyl hydrazine oxidation into diacetyl hydrazine and acetyl diazene ketene which was hepatotoxic [49]. CYP2E1 variation affects the efficacy of therapy, especially in adverse events causing anti-TB drug-induced hepatotoxicity (ATDH) [32]. Wild-type of CYP2E1 rs3813867 (c1/c1) was found to have increased activity compared to other variants of genotypes [9, 49]. These differences in the clinical outcomes of CYP2E1 rs3813867 have been studied in several populations. In Turkey, the heterozygosity of CYP2E1 rs3813867 was observed to increase the risk of ATDH, while in the North Indian population, the wild-type had a lower risk [25, 48]. As in China, most of Uyghur genetic variations were c1/c1 but not significantly associated with ATDH [50]. In our study, we found correlation between the genetic variation and ATDH. However, it is a potential issue for further investigation.


The ABCB1 and CYP2E1 genetic variations may have no significant correlation (p > 0.05) with the duration of TB therapy, although variations was occurred in ABCB1, due to small sample size. The result of the present work may provide as preliminary data on ABCB1 (rs1128503, rs1045642) and CYP2E1 (rs3813867) genetic profiles in Indonesian populations.


  • ABCB1 (rs1128503, rs1045642) and CYP2E1 (rs3813867) were considered responsible for drug efflux or metabolism, but due to the small number of patients, we could not find the significant involvement of these SNPs.

  • We did not use a positive control for RFLP, although we used the GAPDH primer as an internal control for PCR.

  • The visualization of PCR fragments was low quality due to low of sample concentrations; however, specific bands of correct size were observed.

Availability of data and materials

All data generated or analysed during this study are included in this published article and available in the repository [].



Adenosine triphosphate (ATP)-binding cassette B1


Anti-TB drug-induced hepatotoxicity


Cytochrome P-450 2E1


Hardy–Weinberg equilibrium


Multiple drug resistant tuberculosis

M. tuberculosis :

Mycobacterium tuberculosis


Single nucleotide polymorphisms


Polymerase chain reaction-restriction fragment length polymorphism




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We would like to thank our team Nurfina Septiana, Lily Cyntia Fauzi, and Hidayatun Nisa for great collaboration.


This research was partially funded by Grant-in-aids from Universitas Padjadjaran for MIB.

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Authors and Affiliations



MIB and RA are designing the work, MIB is writing the manuscript, compiling and interpretation of data; ASWK, WNI, HH are collecting samples and compiling the data; SDA is analysis the data; AD, MM, TR, IMP, and AAS are substantively revised the draft. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Melisa Intan Barliana.

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All patients were anonymized and informed about the research, then agreed and wrote informed consent to participate. All procedures performed in studies involving human participants comply with the ethical standards of the institutional and/or national research committee, Health Research Ethics Committee of Universitas Padjadjaran (No. 927/UN6.C.10/KEPK/PN/2017). The present research was also conducted in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Supplementary Information

Additional file 1: Table S1.

Primers for SNP genotyping [18, 33].

Additional file 2: Figure S1.

Gender of TB patients.

Additional file 3: Figure S2.

Age range of TB patients.

Additional file 4:

Figure S3. Genotype distribution of a) ABCB1 rs1128503, b) ABCB1 rs1045642, and c) CYP2E1 rs3813867.

Additional file 5: Table S2.

Hardy–Weinberg Equilibrium for the Genotype of ABCB1 rs1128503.

Additional file 6

: Table S3. Hardy–Weinberg Equilibrium for the Genotype of ABCB1 rs1045642.

Additional file 7: Table S4.

Hardy–Weinberg Equilibrium for the Genotype of CYP2E1 rs3813867.

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Barliana, M.I., Kusuma, A.S.W., Insani, W.N. et al. Genetic variation of ABCB1 (rs1128503, rs1045642) and CYP2E1 rs3813867 with the duration of tuberculosis therapy: a pilot study among tuberculosis patients in Indonesia. BMC Res Notes 14, 295 (2021).

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