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Resistance Mutation – Causes, Types & Treatment

A resistance mutation is a genetic change in pathogens or tumor cells that makes them insensitive to specific medications, reducing treatment effectiveness.

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Things worth knowing about "Resistance mutation"

A resistance mutation is a genetic change in pathogens or tumor cells that makes them insensitive to specific medications, reducing treatment effectiveness.

What Is a Resistance Mutation?

A resistance mutation is a change in the genetic material (DNA or RNA) of a pathogen – such as bacteria, viruses, or fungi – or of a tumor cell, which causes it to become insensitive (resistant) to a specific drug or treatment. Resistance mutations represent one of the most pressing challenges in modern medicine, as they can significantly reduce the effectiveness of antibiotics, antiviral agents, and cancer therapies.

Causes and Development

Resistance mutations arise through spontaneous or stress-induced changes in genetic material. The key mechanisms include:

Spontaneous mutations: Random errors can occur during every cell division or viral replication. Some of these changes give the pathogen or cell a survival advantage in the presence of a drug.
Selection pressure from medication: When a pathogen is exposed to a drug, sensitive strains are killed while resistant mutants survive and multiply (natural selection).
Horizontal gene transfer (in bacteria): Bacteria can transfer resistance genes directly to other bacteria via structures called plasmids, even across different species.
Incomplete therapy: A treatment course that is not fully completed promotes the selection of resistant variants.

Types of Resistance Mutations

Primary Resistance

Primary resistance (also called intrinsic resistance) is present before any contact with a drug. The pathogen or tumor cell is naturally insensitive to a particular agent.

Secondary Resistance

Secondary resistance (also called acquired resistance) develops during treatment. It arises when a mutation occurs under the selective pressure of a drug and the resistant variant becomes dominant.

Relevant Medical Fields

Antibiotic Resistance

Resistance of bacteria to antibiotics is one of the greatest global health threats. Well-known examples include methicillin-resistant Staphylococcus aureus (MRSA) and multidrug-resistant tuberculosis. The World Health Organization (WHO) ranks antibiotic resistance among the ten greatest threats to global public health.

Viral Resistance

Viruses can also develop resistance mutations. A prominent example is the resistance of the human immunodeficiency virus (HIV) to antiretroviral drugs. To counteract this, HIV is now treated with a combination therapy using multiple agents simultaneously, since the probability of simultaneous mutations against several substances is extremely low.

Oncological Resistance (Cancer)

In cancer therapy, tumor cells can develop resistance mutations under the pressure of chemotherapy or targeted therapies (e.g., tyrosine kinase inhibitors). A well-known example is the T315I mutation in the BCR-ABL gene in chronic myeloid leukemia (CML), which confers resistance to multiple drugs.

Diagnosis

Detection of resistance mutations is performed using various methods:

Resistance testing / antibiogram: In bacterial infections, laboratory tests determine which antibiotics remain effective against the isolated pathogen.
Molecular genetic methods: PCR (polymerase chain reaction) or sequencing technologies (e.g., next-generation sequencing) can directly identify specific mutations in the genetic material.
Liquid biopsy: In oncology, circulating tumor DNA fragments in the blood can be analyzed for resistance mutations.

Treatment and Strategies to Overcome Resistance

Depending on the type of resistance, different approaches are used:

Change of agent: Switching to a medication against which no resistance has (yet) developed.
Combination therapy: Simultaneous use of multiple drugs to minimize the likelihood of concurrent resistance development.
Next-generation agents: Development of drugs that remain effective against known resistance mutations (e.g., osimertinib targeting the EGFR T790M mutation in lung cancer).
Resistance inhibitors: Substances that block resistance mechanisms (e.g., beta-lactamase inhibitors combined with antibiotics).
Preventive measures: Rational use of antibiotics, strict hygiene protocols, and vaccination to reduce selection pressure.

References

World Health Organization (WHO): Antimicrobial resistance. Global action plan on antimicrobial resistance. Geneva: WHO Press, 2015. Available at: https://www.who.int/publications/i/item/9789241509763
Stratton CW: Dead bugs don't mutate: susceptibility issues in the emergence of bacterial resistance. Emerging Infectious Diseases. 2003;9(1):10-16. doi:10.3201/eid0901.020172
Garraway LA, Janne PA: Circumventing cancer drug resistance in the era of personalized medicine. Cancer Discovery. 2012;2(3):214-226. doi:10.1158/2159-8290.CD-12-0012

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