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Long-patch Base Excision Repair01:02

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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 selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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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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DNA Distortion and Damage
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Related Experiment Video

Updated: May 20, 2025

ACT1-CUP1 Assays Determine the Substrate-Specific Sensitivities of Spliceosomal Mutants in Budding Yeast
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Cancer-associated SF3B1 mutation K700E causes widespread changes in U2/branchpoint recognition without altering

Andrey Damianov1, Chia-Ho Lin1, Jian Zhang2

  • 1Department of Microbiology, Immunology, and Molecular Genetics, Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, CA 90095.

Proceedings of the National Academy of Sciences of the United States of America
|March 26, 2025
PubMed
Summary
This summary is machine-generated.

SF3B1 mutations, common in myelodysplastic syndromes, disrupt spliceosome function. This study reveals that the K700E mutation causes imprecise branch site recognition, expanding the understanding of its oncogenic role.

Keywords:
U2 snRNPintron branchpointmyelodysplastic syndromepre-mRNA splicing

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Mutations in the U2 snRNP protein SF3B1 are frequently observed in myelodysplastic syndromes and other cancers.
  • Specific mutations, such as K700E, disrupt protein interactions and lead to aberrant alternative 3' splice site activation, likely due to altered branch site recognition by the spliceosome.

Purpose of the Study:

  • To investigate the impact of the SF3B1 K700E mutation on branch site (BS) recognition across the transcriptome.
  • To identify changes in BS binding associated with aberrant alternative 3' splice site (ss) selection.

Main Methods:

  • Utilized U2 immunoprecipitation sequencing (IP-seq) to profile branch site binding.
  • Analyzed K562 leukemia cells harboring the SF3B1 K700E mutation.

Main Results:

  • Identified shifted branch sites associated with alternative 3' splice sites activated by the K700E mutation.
  • Discovered thousands of additional changes in branch site binding in mutant cells that do not alter splicing.
  • Observed that these novel branch sites are proximal to natural sites and possess enhanced U2 snRNA base-pairing potential or stronger polypyrimidine tracts.

Conclusions:

  • The SF3B1 K700E mutation induces widespread imprecision in branch site recognition.
  • This imprecision in branch site recognition, with limited changes in 3' splice site selection, broadens the known physiological consequences of this oncogenic mutation.