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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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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 back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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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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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
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(Single-stranded DNA) gaps in understanding BRCAness.

Anne Schreuder1, Tiemen J Wendel1, Carlo G V Dorresteijn2

  • 1Leiden University Medical Center, Department of Human Genetics, Leiden, The Netherlands; Oncode Institute, Utrecht, The Netherlands.

Trends in Genetics : TIG
|May 24, 2024
PubMed
Summary
This summary is machine-generated.

BRCA1 and BRCA2 proteins suppress tumors through homologous recombination, replication protection, and single-stranded (ss)DNA gap suppression. These functions are interconnected, not separate, impacting genomic instability and cancer treatment.

Keywords:
BRCA1BRCA2DNA double-strand break repairHomologous recombinationreplication stresssingle-stranded DNA gaps

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • BRCA1 and BRCA2 proteins are crucial tumor suppressors.
  • Their roles are traditionally divided into homologous recombination, replication fork protection, and ssDNA gap suppression.
  • The relative importance and interplay of these functions are debated.

Purpose of the Study:

  • To review the origin and resolution of ssDNA gaps.
  • To discuss recent advances in understanding BRCA1/2's role in ssDNA gap suppression.
  • To evaluate the interconnectedness of BRCA1/2's tumor-suppressive functions.

Main Methods:

  • Literature review of existing research on BRCA1/2 functions.
  • Analysis of data linking ssDNA gap accumulation to genomic instability and chemosensitivity.
  • Discussion of the challenges in dissecting individual BRCA1/2 functions.

Main Results:

  • ssDNA gap accumulation in BRCA1/2-deficient cells correlates with genomic instability and chemosensitivity.
  • The precise causative role of gap suppression and its separation from other BRCA1/2 functions remain unclear.
  • BRCA1/2 functions in homologous recombination, replication fork protection, and gap suppression are closely intertwined.

Conclusions:

  • The tumor-suppressive functions of BRCA1 and BRCA2 are not mutually exclusive.
  • These functions are deeply interconnected and likely work in concert.
  • Understanding this interplay is key to comprehending BRCA1/2's role in genomic stability and cancer therapy response.