Detection of rpoB and katG Mutations in TB Resistance in Kelantan

| Posted in: Science Health Sciences Journals

Journal name: The Malaysian Journal of Medical Sciences
Original article title: Genotypic Detection of rpoB and katG Gene Mutations Associated with Rifampicin and Isoniazid Resistance in Mycobacterium Tuberculosis Isolates: A Local Scenario (Kelantan)
The Malaysian Journal of Medical Sciences (MJMS) is a peer-reviewed, open-access journal published online at least six times a year. It covers all aspects of medical sciences and prioritizes high-quality research.
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Author:

Nurul-Ain Ismail, Mohd Fazli Ismail, Siti Suraiya MD Noor, Siti Nazrina Camalxaman


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The Malaysian Journal of Medical Sciences:

(A peer-reviewed, open-access journal)

Full text available for: Genotypic Detection of rpoB and katG Gene Mutations Associated with Rifampicin and Isoniazid Resistance in Mycobacterium Tuberculosis Isolates: A Local Scenario (Kelantan)

Year: 2016

Copyright (license): CC BY 4.0


Summary of article contents:

Introduction

Drug-resistant tuberculosis (DR-TB) poses a significant public health threat globally. The study aims to investigate the frequency of genetic mutations associated with resistance to two crucial anti-TB drugs, Rifampicin (RIF) and Isoniazid (INH), by analyzing nine clinical isolates of Mycobacterium tuberculosis. Understanding the mechanisms of drug resistance through mutation characterization is essential for improving treatment options and developing effective diagnostic techniques.

Mutation Patterns in Drug Resistance

The study revealed that a significant portion of the analyzed isolates exhibited mutations in the rpoB gene, with 80% of the isolates carrying mutations at codons 119 and 135, which are commonly linked to RIF resistance. Additionally, 70% of isolates showed mutations in the katG gene at codon 238, associated with INH resistance. These findings are critical as they not only reflect the current landscape of drug-resistant strains within the local clinical setting at Hospital Universiti Sains Malaysia but also emphasize the potential need for molecular-based detection methods to identify resistant bacteria effectively. The analysis demonstrates a unique mutation profile that differs from previously reported studies, highlighting geographical variations in resistance mechanisms.

Conclusion

The findings underscore the significance of detecting mutations in the rpoB and katG genes in understanding the emergence of resistance to anti-TB drugs. The high frequency of identified mutations suggests that ongoing investigations are vital to comprehensively map the distribution of resistant strains and their molecular mechanisms. Ultimately, this study contributes to a broader understanding of DR-TB in Malaysia and aids in the enhancement of resistance detection strategies, which is essential for effective control and treatment of tuberculosis.

FAQ section (important questions/answers):

What is drug-resistant tuberculosis and why is it concerning?

Drug-resistant tuberculosis (DR-TB) poses significant public health challenges globally, making treatment difficult. Understanding the genetic mutations in clinical isolates helps to identify mechanisms of drug resistance, which is essential for developing effective treatment options.

How were the clinical isolates tested for drug resistance?

Nine clinical isolates of Mycobacterium tuberculosis were examined using polymerase chain reaction (PCR) amplification and DNA sequencing. The analysis targeted mutations in the rpoB and katG genes, which are associated with rifampicin and isoniazid resistance.

What were the key findings regarding the gene mutations?

The study found that 80% of isolates had mutations in the rpoB gene, specifically at codons 119 and 135. Moreover, 70% of isolates showed mutations in the katG gene at codon 238, indicating a connection to drug resistance.

Why is understanding mutations in tuberculosis important?

Identifying mutations in genes associated with drug resistance is crucial for diagnosing and treating tuberculosis. This molecular understanding can enhance detection methods for drug-resistant strains and contribute to addressing treatment failures and improving patient outcomes.

Glossary definitions and references:

Scientific and Ayurvedic Glossary list for “Detection of rpoB and katG Mutations in TB Resistance in Kelantan”. This list explains important keywords that occur in this article and links it to the glossary for a better understanding of that concept in the context of Ayurveda and other topics.

1) Mutation:
Mutation refers to a change in the DNA sequence of an organism. It can lead to variations that may enhance or diminish the organism's functions, particularly in pathogens like Mycobacterium tuberculosis. In the context of drug resistance, mutations are critical as they can render traditional treatments ineffective, complicating disease management.

2) Tuberculosis:
Tuberculosis (TB) is a contagious infectious disease primarily affecting the lungs, caused by Mycobacterium tuberculosis. TB poses significant global health challenges, especially in developing countries. It requires long-term treatment with specific antibiotics, and the emergence of multi-drug resistant strains further complicates the treatment landscape and public health efforts.

3) Drug:
In medical terms, a drug refers to any substance used to diagnose, cure, treat, or prevent diseases. Drugs for tuberculosis include Isoniazid and Rifampicin, which are cornerstone treatments. Understanding the mechanisms and mutations related to drug resistance is crucial in developing effective therapies and reducing morbidity associated with TB.

4) Table:
In the context of scientific literature, a table presents organized data clearly and succinctly. It effectively conveys complex information, such as the relationship between genetic mutations and drug resistance in tuberculosis. Tables help researchers and clinicians quickly compare results, facilitating discussions for better treatment strategies based on empirical evidence.

5) Study (Studying):
A study refers to a systematic investigation aimed at discovering new information or validating existing knowledge. In this context, the study discussed focuses on analyzing mutations in tuberculosis strains to evaluate drug resistance. Research studies are vital for advancing medical knowledge, improving treatment protocols, and shaping public health policies.

6) Line:
In a biological context, a 'line' may refer to a lineage or a specific sequence in genetic research. It can denote distinct genetic variations within a population, influencing research outcomes on drug resistance in Mycobacterium tuberculosis. The concept of 'line' aids in understanding the evolutionary dynamics of pathogens.

7) Activity:
Activity usually pertains to the biochemical or physiological actions of a substance or organism. In drug resistance research, assessing the activity of antibiotics against resistant strains of Mycobacterium tuberculosis is crucial. Understanding the effectiveness of these drugs helps guide treatment approaches and informs public health strategies.

8) Chemotherapy:
Chemotherapy originally refers to the treatment of disease using chemical substances, particularly for cancer. However, it also applies to the treatment of tuberculosis with antimicrobial drugs. Effective chemotherapy regimens for TB must be carefully managed to prevent resistance, ensuring optimal therapeutic outcomes and minimizing disease transmission.

9) Medicine:
Medicine is the science and practice of diagnosing, treating, and preventing illness. It encompasses various disciplines, including pharmacology, pathology, and epidemiology. Understanding drug resistance in tuberculosis is a fundamental aspect of modern medicine, highlighting the need for innovative therapies and public health interventions to combat emerging health challenges.

10) Kampala:
Kampala is the capital city of Uganda, where significant research on drug-resistant tuberculosis has been conducted. It represents a locale for understanding TB's impact on public health. Identifying resistance patterns in urban areas like Kampala is critical for tailoring effective treatment strategies and improving patient outcomes.

11) Temple:
Temple may refer to a researcher or a research group working on drug resistance or other aspects of tuberculosis. Researchers contribute to the body of knowledge and clinical practices by investigating genetic mutations or resistance mechanisms, thus driving advancements in treatment and improving health outcomes for patients worldwide.

12) Farmer:
Farmer can denote a researcher or a public health figure actively involved in tuberculosis research. The contributions of these individuals are vital in comprehending the complexities of TB treatment, focusing on drug resistance and the socio-economic factors contributing to the persistence and spread of this public health threat.

13) Cina:
China is a country that has been significantly impacted by tuberculosis, including drug-resistant strains. Research conducted in China contributes to global understanding of TB epidemiology and resistance mechanisms. The findings from such studies can inform public health responses and foster international collaboration to eradicate TB.

14) Antibiotic (Antibacterial):
Antibiotic refers to a class of drugs used to treat bacterial infections, central to tuberculosis management. The effectiveness of antibiotics can be compromised by resistance, necessitating ongoing research into alternative treatments and management strategies, particularly in light of increasing drug-resistant tuberculosis strains worldwide.

15) Transmission:
Transmission refers to how infectious diseases spread from person to person. Understanding the transmission dynamics of tuberculosis is essential for controlling outbreaks and developing effective prevention strategies. Research into the genetic factors affecting transmission can help tailor public health interventions and reduce TB incidence globally.

16) Purification:
Purification generally refers to the process of isolating specific substances, often in the context of extracting DNA or other biological materials. In tuberculosis research, purification techniques are crucial for obtaining high-quality samples for genetic analysis, which is vital for studying mutations related to drug resistance.

17) Discussion:
Discussion in a research context typically involves interpretation of findings, contextualizing results within the existing literature, and proposing future research directions. It is an essential part of scientific writing that helps clarify the implications of research findings and their potential impact on clinical practice and public health.

18) Reflecting:
Reflecting in scientific literature is the process of contemplating and analyzing research findings, often leading to deeper insights or new hypotheses. Researchers reflect on their results to understand their broader significance for disease management, drug resistance, and future studies, facilitating a continuous cycle of scientific inquiry.

19) Science (Scientific):
Science encompasses systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. In this context, science underpins our understanding of tuberculosis, its treatment, and drug resistance patterns, guiding research and public health initiatives aimed at combating this widespread disease.

20) Disease:
Disease refers to any impairment of the normal functions of the body that leads to health complications. Tuberculosis is a significant global disease, posing substantial threats to individual and public health. Understanding disease mechanisms, particularly involving drug resistance, is critical to developing effective treatments and prevention strategies.

21) Nature:
Nature often refers to the natural world, including the biological organisms within it, but in a scientific context, it can indicate the inherent characteristics of a phenomenon. In drug resistance research, understanding the nature of mutations and their effects on Mycobacterium tuberculosis reveals insights critical for combating antibiotic resistance.

22) Rules:
Rules in a research context may refer to the established guidelines or protocols governing scientific methods and ethical standards. Adhering to these rules ensures integrity and validity in research processes, including studies investigating drug resistance in tuberculosis which inform treatment strategies and public health policies.

23) Kasa (Kasha):
Kasa might refer to a gene or concept related to resistance mechanisms in Mycobacterium tuberculosis. Understanding specific genetic components like kasA is necessary for elucidating the complex interactions involved in drug resistance and may play a role in developing targeted therapies for tuberculosis patients.

24) Beta:
Beta often refers to a type of unit or configuration in scientific contexts, including biochemical pathways and drug interactions. In studying Mycobacterium tuberculosis, understanding beta-subunits in RNA polymerase may elucidate mechanisms of drug resistance and inform strategies to combat these resistant strains effectively.

25) Post:
Post generally refers to subsequent or later phases in a process. In research contexts, discussing post-treatment effects, outcomes, or strategies is crucial for evaluating the effectiveness of interventions against drug-resistant tuberculosis, guiding public health policies, and informing future research directions.

Other Health Sciences Concepts:

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Discover the significance of concepts within the article: ‘Detection of rpoB and katG Mutations in TB Resistance in Kelantan’. Further sources in the context of Health Sciences might help you critically compare this page with similair documents:

Geographical location, Geographical distribution, Polymerase chain reaction, Drug resistance, Antibiotic resistance, Molecular characterization, Multi drug resistant tuberculosis, Airborne particles, Economic impact, Gene mutation, Asian countries, Treatment failure, Public health concern, PCR amplification, Rapid detection, Genomic DNA isolation, Molecular mechanism, Mycobacterium tuberculosis, Clinical isolate, First line drug, Drug resistant strains, Clinical Microbiology Laboratories, Genetic Analysis, MDR-TB, DNA sequencing, Aetiological agent, PCR product, Drug-resistant tuberculosis, Isoniazid resistance, RpoB gene, KatG gene, Underlying mechanisms, Nucleotide substitution, Genotypic method, Rifampicin resistance, Antimicrobial Drug, Mutation analysis, Drug resistance profile, Point mutation, RNA polymerase, Drug-resistant TB, Endemicity, Genotypic analysis, Drug sensitivity testing, Molecular based methods, PCR reaction, Resistance pattern, Resistant strain, Local setting, Phenotypic resistance, Amino acid change, INH resistance, Mutational analysis, Key genes, KatG mutation.

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