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Related Concept Videos

Viruses with RNA Genomes01:29

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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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...
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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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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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siRNA Electroporation to Modulate Autophagy in Herpes Simplex Virus Type 1-Infected Monocyte-Derived Dendritic Cells
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Reverse transcriptase inhibitors induce autophagy in a LINE-1 ORF1p-dependent manner.

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    Reverse transcriptase inhibitors impact cancer cells by increasing LINE-1 expression and ORF1p protein. This leads to DNA damage and autophagy, but inhibiting autophagy or ORF1p prevents these effects.

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    Area of Science:

    • Molecular Biology
    • Cancer Research
    • Genomics

    Background:

    • Human Long Interspersed Nuclear Element-1 (LINE-1) retrotransposons are active in cancer.
    • LINE-1s encode proteins ORF1p and ORF2p, crucial for their propagation.
    • Reverse transcriptase inhibitors (RTIs) are known to affect cancer cell proliferation.

    Purpose of the Study:

    • To investigate the effects of different RTIs on LINE-1 expression and cellular processes in cancer cells.
    • To elucidate the role of LINE-1 ORF1p in DNA damage, nuclear integrity, and autophagy.
    • To determine if LINE-1's role in autophagy is dependent on retrotranscription.

    Main Methods:

    • Treatment of prostate cancer cells with specific RTIs.
    • Analysis of LINE-1 mRNA and ORF1p protein levels.
    • Immunofluorescence to detect ORF1p localization, DNA damage, and lamin B1.
    • Assessment of autophagy markers and micronuclei formation.

    Main Results:

    • Two RTIs upregulated LINE-1 mRNA and ORF1p protein, leading to nuclear accumulation of ORF1p.
    • ORF1p interacted with lamin B1 and DNA damage factors, accumulating in micronuclei with damaged DNA and p62.
    • Inhibiting autophagy or reducing ORF1p levels prevented DNA damage and preserved lamin B1 integrity.

    Conclusions:

    • LINE-1 ORF1p plays a significant role in the cancer cell autophagy response, independent of retrotranscription.
    • Targeting LINE-1 ORF1p or autophagy pathways may offer novel therapeutic strategies in cancer treatment.
    • Understanding LINE-1's non-retrotanspositional functions is critical for cancer therapy.