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Mismatch Repair01:20

Mismatch Repair

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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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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Mutations01:35

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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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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Updated: Dec 12, 2025

Assessing Somatic Hypermutation in Ramos B Cells after Overexpression or Knockdown of Specific Genes
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Germline RAD54L with somatic POLE defect implicated in Hypermutation phenotype: case report.

Bisan Abdalfatah Zohud1, Meiling Wang1, Xin Cai2

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|August 8, 2020
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A rare hypermutated colorectal cancer case reveals a novel RAD54L_POLE double-strand break repair pathway. This discovery offers new insights into hypermutation mechanisms and early cancer detection.

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Homogenous recombinationHypermutated CRCPOLERad45L

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Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Colorectal cancer (CRC) is a leading cause of cancer mortality.
  • Hypermutated CRC, though rare, is curable if diagnosed early.
  • The mechanisms driving hypermutated CRC development are not fully understood.

Observation:

  • A 41-year-old Chinese female presented with right-sided colon adenocarcinoma.
  • Genomic analysis revealed a POLE somatic mutation (p.P286R) and a RAD54L germline mutation (c.1093_1169+15dup).
  • The tumor was microsatellite stable (MSS) with a high tumor mutation burden (377.0 Muts/Mb).

Findings:

  • This case presents the first reported association between RAD54L germline mutation and POLE exonuclease domain hypermutated cancer.
  • A novel RAD54L_POLE double-strand break repair (DSBR) pathway is proposed as a mechanism for hypermutated CRC development.

Implications:

  • Next-generation sequencing is crucial for diagnosing rare tumors and uncovering novel genetic disease mechanisms.
  • Understanding this new pathway could lead to improved diagnostic strategies for hypermutated colorectal cancer.