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Related Experiment Videos

Allelotype analysis in relapsed childhood acute lymphoblastic leukemia.

Seisho Takeuchi1, Taku Seriu, Jacques J M van Dongen

  • 1Department of Medicine, Kochi Medical School, Okohcho, Nankoku, Kochi 783-8505, Japan. takeuti@kochi-ms.ac.jp

Oncogene
|October 10, 2003
PubMed
Summary

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Loss of heterozygosity (LOH) is common in relapsed childhood acute lymphoblastic leukemia (ALL), frequently affecting chromosome 9p, 12p, 4q, 6q, and 17q. Some patients show clonal evolution, while others maintain the same LOH profile.

Area of Science:

  • Genetics
  • Oncology
  • Pediatric Hematology

Background:

  • Childhood acute lymphoblastic leukemia (ALL) relapse is a significant challenge in pediatric oncology.
  • Understanding the genetic alterations driving ALL relapse is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the frequency and patterns of loss of heterozygosity (LOH) in relapsed childhood ALL.
  • To identify specific chromosomal regions and genes implicated in ALL relapse and clonal evolution.

Main Methods:

  • Allelotype analysis was performed on 38 cases of relapsed childhood ALL using 71 polymorphic markers.
  • Loss of heterozygosity (LOH) was assessed to identify chromosomal aberrations.
  • Sequential analysis of samples from initial diagnosis and relapse was conducted to evaluate clonal evolution.

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Main Results:

  • 68% of patients exhibited LOH at one or more chromosomal arms, indicating frequent genetic instability at relapse.
  • The most common LOH events occurred at the p16/INK4a locus on 9p (39%) and the TEL gene locus on 12p (25%).
  • Significant LOH was also observed on chromosome arms 4q (20%), 6q (21%), and 17q (20%).
  • Sequential analysis revealed that 63% of patients had identical LOH profiles at diagnosis and relapse, while 37% showed distinct alterations, suggesting clonal evolution.

Conclusions:

  • Loss of heterozygosity is a frequent event in relapsed childhood ALL, implicating tumor suppressor genes on chromosomes 4q, 6q, 17q, and the p16 and TEL genes.
  • Clonal evolution occurs in a subset of relapsed ALL cases, contributing to disease heterogeneity.
  • These findings highlight the importance of specific genetic loci in ALL relapse and suggest potential therapeutic targets.