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DNA damage response in patients with pediatric Acute Lymphoid Leukemia during induction therapy

Júlia Plentz Portich1, Rafael Pereira Dos Santos2, Nathalia Kersting1

  • 1Cancer and Neurobiology Laboratory, Experimental Research Center, Clinical Hospital (CPE-HCPA), Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.

Leukemia Research
|January 23, 2017
PubMed

Insights

This study examined DNA damage and repair in pediatric Acute Lymphoid Leukemia (ALL) patients undergoing chemotherapy. While overall DNA damage didn't increase, changes in low-damage cells suggest repair mechanisms may influence treatment outcomes.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Predicting chemotherapy response is vital in cancer treatment.
  • Nucleotide Excision Repair (NER) pathways are implicated in DNA repair and cancer prognosis.
  • Limited research exists on DNA damage and repair in pediatric Acute Lymphoid Leukemia (ALL).

Purpose of the Study:

  • To investigate DNA damage and NER pathway gene expression in pediatric ALL patients during chemotherapy induction.
  • To explore the potential link between DNA damage, repair mechanisms, and clinical outcomes in pediatric ALL.

Main Methods:

  • An observational follow-up study involving 28 pediatric ALL patients.
  • Bone marrow samples collected at diagnosis, day 15 (D15), and day 35 (D35) of treatment.
  • Assessed DNA damage using the Comet Assay and analyzed NER pathway gene expression.

Main Results:

  • No significant increase in the overall DNA damage index was observed.
  • A reduction in cells with low DNA damage was noted by D35 compared to diagnosis.
  • NER pathway gene expression remained stable, with one patient showing a significant decrease, possibly due to pathway downregulation.

Conclusions:

  • DNA damage and repair dynamics in pediatric ALL bone marrow samples were analyzed for the first time.
  • Observed changes in DNA damage and repair may influence drug resistance and relapse risk.
  • Further monitoring of patient outcomes is needed to determine the implications for survival and relapse rates.
Keywords:
Acute Lymphoid LeukemiaComet assayDNA damageDNA repairNER pathway

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