JoVE Science Education > Reparo e Recombinação de DNA

Capítulo 7

Reparo e Recombinação de DNA

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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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Reparo por Excisão de Base

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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Reparo por Excisão de Base: Via Longa

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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Reparo por Excisão de Nucleotídeo

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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Polimerases de Translesão de DNA

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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Reparando Quebras de Fita dupla

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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Danos no DNA podem Paralisar o Ciclo Celular

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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Recombinação Homóloga

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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Reiniciando Forquilhas de Replicação Paralisadas

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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Conversão de Gene

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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Visão Geral da Transposição e Recombinação

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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Transposons de 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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Retrovírus

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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Retrotransposons LTRs

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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Retrotransposons Não-LTRs

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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Recombinação Específica de Sítios Conservados e Variação de Fase

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