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Related Concept Videos

Homologous Recombination02:31

Homologous Recombination

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Crossing Over01:30

Crossing Over

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Crossing Over01:34

Crossing Over

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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Homologous Recombination Subpathways: A Tangle to Resolve.

Amira Elbakry1, Markus Löbrich1

  • 1Radiation Biology and DNA Repair, Technical University of Darmstadt, Darmstadt, Germany.

Frontiers in Genetics
|August 19, 2021
PubMed
Summary

This mini-review explores homologous recombination (HR) subpathways and their role in DNA repair. HR is a key process for fixing DNA damage, but it involves multiple subpathways that can lead to different outcomes. The authors review recent findings on how these subpathways function in different cell types and what factors influence their use. They also examine new models of subpathway usage and how repair outcomes vary. The review highlights the importance of understanding these subpathways for developing better cancer treatments and improving DNA repair strategies.

Keywords:
ATRXRECQ5crossoverdouble-strand breakholliday junctionhomologous recombinationpathway choicesynthesis-dependent strand annealingDNA repair mechanismsHomologous recombination pathwaysCancer therapy developmentGenetic repair outcomes

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Area of Science:

  • DNA repair mechanisms in molecular biology
  • Genetic recombination pathways in cancer research

Background:

DNA damage repair processes remain a central focus in molecular biology. Homologous recombination (HR) is a well-known mechanism for fixing double-strand breaks. However, the exact roles of HR subpathways remain unclear. Prior research has identified multiple subpathways, but their regulation is not fully understood. This uncertainty has limited clinical applications of HR mechanisms. Recent studies have begun to clarify how these subpathways function in different cell types. The variability in repair outcomes suggests a need for more detailed analysis. Understanding subpathway regulation could improve cancer therapies. This paper addresses these unresolved questions in HR repair.

Purpose Of The Study:

The goal of this mini-review is to clarify the roles of HR subpathways in DNA repair. The authors aim to summarize current knowledge on subpathway regulation. They focus on how these subpathways differ across cell types. The study also seeks to highlight new models of subpathway usage. By examining recent findings, the authors want to update the understanding of HR intermediates. They also aim to reassess the frequency of repair outcomes. This work addresses gaps in HR pathway research. The findings may help in developing targeted cancer treatments.

Main Methods:

The authors conducted a literature review on HR subpathways in human cells. They analyzed recent studies on subpathway regulation. The review includes data on repair outcomes and cell-type differences. The authors examined new models of subpathway usage. They evaluated the role of specific factors in subpathway choice. The study also looked at how repair intermediates form. The authors synthesized findings from multiple research groups. Their approach focuses on integrating recent discoveries into a coherent framework.

Main Results:

The review identifies distinct HR subpathways with unique genetic outcomes. New models suggest subpathway usage varies by cell type. Repair intermediates have been redefined in recent studies. The frequency of repair outcomes is now better understood. Specific factors regulate subpathway choice during repair. The role of RAD51 and BRCA1 is highlighted in subpathway regulation. Repair outcomes differ based on the subpathway used. These findings provide a clearer picture of HR mechanisms.

Conclusions:

The authors conclude that HR subpathways are regulated by distinct factors. They propose that subpathway choice affects repair outcomes. New models of subpathway usage are supported by recent data. The authors suggest that these findings could inform cancer therapies. Understanding subpathway regulation is key to improving DNA repair strategies. The review emphasizes the need for further research on repair intermediates. The clinical relevance of HR subpathways is now more apparent. These conclusions are based on the authors' synthesis of recent findings.

The review identifies distinct HR subpathways with unique genetic outcomes, regulated by specific factors like RAD51 and BRCA1.

Subpathway choice influences repair outcomes, with different subpathways leading to distinct genetic results based on cell-type-specific factors.

New models suggest subpathway usage varies by cell type, with repair intermediates redefined based on recent studies.

RAD51 and BRCA1 are highlighted as key regulators of subpathway choice during DNA repair in human cells.

Repair outcomes differ based on the subpathway used, with distinct genetic results observed in different cell types.

The authors suggest that understanding HR subpathway regulation could inform cancer therapies and DNA repair strategies.