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Related Concept Videos

Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
Antiviral Nucleoside Inhibitors01:22

Antiviral Nucleoside Inhibitors

Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...
Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...

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Updated: Jul 5, 2026

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings
19:57

An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings

Published on: March 30, 2014

[HIV-1 genotypic resistance].

Carmen Maroto Vela

    Anales De La Real Academia Nacional De Medicina
    |April 18, 2008
    PubMed
    Summary
    This summary is machine-generated.

    This study explores viral characteristics, biological cycles, and antiretroviral drug resistance. It highlights the impact of viral mutations on treatment effectiveness in patients.

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    Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
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    Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

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    An Affordable HIV-1 Drug Resistance Monitoring Method for Resource Limited Settings
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    A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
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    Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors
    05:46

    Rapid Screening of HIV Reverse Transcriptase and Integrase Inhibitors

    Published on: April 9, 2014

    Area of Science:

    • Virology
    • Molecular Biology
    • Pharmacology

    Background:

    • Understanding viral genome, protein production, and biological cycles is crucial for identifying antiretroviral drug targets.
    • Viral resistance phenomena arise from high mutation rates, impacting treatment efficacy.
    • Antiretroviral therapies target specific stages of the viral life cycle.

    Discussion:

    • Investigating viral mutation interpretation algorithms is essential for personalized medicine.
    • Comparing the impact of single versus multiple mutations on drug resistance is key.
    • Clinical validation of resistance interpretation algorithms is ongoing.

    Key Insights:

    • Viral characteristics and biological cycles dictate antiretroviral drug action.
    • High viral mutation rates drive drug resistance, necessitating continuous monitoring.
    • Algorithms for interpreting viral mutations can predict treatment response.

    Outlook:

    • Further research into viral evolution and resistance mechanisms is needed.
    • Development of novel antiretroviral agents targeting resistant strains is crucial.
    • Optimizing resistance testing interpretation will improve patient outcomes.