JoVE Science Education > DNA Riparazione e Ricombinazione

Capitolo 7

DNA Riparazione e Ricombinazione

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a ...

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Base Excision Repair

One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and ...

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Long-patch Base Excision Repair

Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this ...

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Nucleotide Excision Repair

Overview Exposure to mutagens can damage DNA and result in bulky lesions that distort the double-helix structure or impede proper transcription. Damaged ...

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DNA polimerasi di translesione

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide ...

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Riparazione delle rotture a doppio filamento

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the ...

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Il danno al DNA può arrestare il ciclo cellulare

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages ...

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Ricombinazione omologa

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of ...

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Riavvio delle forche di replicazione bloccate

DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the ...

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Conversione genica

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the ...

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Trasposizione e ricombinazione

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in ...

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Trasposoni a DNA

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. ...

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Retrovirus

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 ...

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Retrotrasposoni LTR

LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in ...

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Retrotrasposoni non-LTR

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and ...

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Ricombinazione conservativa sito-specifica e variazione di fase

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic ...