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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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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Mitotic recombinatory evolution in acute leukemia.

Peter Papenhausen1, Carla A Kelly1, Zhenxi Zhang2

  • 1Laboratory Corporation of America, 1904 TW Alexander Drive, RTP, NC 27709, United States.

Cancer Genetics
|March 26, 2023
PubMed
Summary
This summary is machine-generated.

Homologous mitotic recombination (HMR) drives clonal evolution in leukemia, challenging previous theories. This study reveals HMR as a common mechanism in acute lymphoblastic leukemia (B-ALL) and acute myelogenous leukemia (AML) cases.

Keywords:
ALLAMLClonal evolutionCopy neutral loss of heterozygosityMitotic recombination

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Area of Science:

  • Hematology and Oncology
  • Cancer Genetics
  • Molecular Biology

Background:

  • Clonal evolution is a key process in leukemia development and progression.
  • Understanding the mechanisms driving clonal evolution is crucial for targeted therapies.
  • Previous assumptions about chromosomal abnormalities in certain leukemia subtypes need re-evaluation.

Purpose of the Study:

  • To investigate the underlying mechanisms of clonal evolution in a cohort of leukemia cases.
  • To identify common etiological factors contributing to chromosomal rearrangements and evolution.
  • To challenge existing hypotheses regarding the origins of specific leukemia-associated chromosomal alterations.

Main Methods:

  • Analysis of a leukemia patient cohort using microarray studies, karyotyping, fluorescence in situ hybridization (FISH), and RNA sequencing.
  • Detailed examination of chromosomal abnormalities, including translocations and inversions, in B-cell acute lymphoblastic leukemia (B-ALL) and acute myelogenous leukemia (AML) cases.
  • Comparative genomic hybridization (CGH) and FISH were used to confirm homologous mitotic recombination (HMR) initiation sites.

Main Results:

  • Homologous mitotic recombination (HMR) was identified as a common etiology for clonal evolution across all studied leukemia cases.
  • In t(1;19) B-ALL, HMR appears to initiate at the PBX1-TCF3 translocation breakpoint or a proximal site, leading to unbalanced derivative 19.
  • In AML cases, HMR was linked to KMT2A-MAML2 and KMT2A-AFDN fusions, with evidence of a recombinatorial hotspot near the CCND1 gene on chromosome 11q.

Conclusions:

  • HMR is a significant driver of clonal evolution in leukemia, offering a unified explanation for observed chromosomal abnormalities.
  • The findings challenge prior models of chromosomal evolution in B-ALL and AML, emphasizing HMR's role.
  • Identifying HMR as a common mechanism provides new avenues for understanding leukemia pathogenesis and potential therapeutic targets.