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Related Experiment Videos

Detection of functional single-nucleotide polymorphisms that affect apoptosis.

Sandra L Harris1, German Gil, Harlan Robins

  • 1Cancer Institute of New Jersey, Robert Wood Johnson Medical School/University of Medicine and Dentistry of New Jersey, 195 Little Albany Street, New Brunswick, NJ 08903, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 2, 2005
PubMed
Summary

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Individual apoptotic responses to gamma radiation vary genetically. A specific AKT1 gene haplotype, prevalent in Caucasians, is linked to lower radiation-induced apoptosis in B lymphocyte cell lines.

Area of Science:

  • Genetics
  • Radiation Biology
  • Cellular Biology

Background:

  • Human EBV-transformed B lymphocyte cell lines (LCLs) exhibit heterogeneous apoptotic responses to gamma radiation.
  • This variation in cellular radiosensitivity has a significant genetic component.
  • Distinct response distributions were observed between Caucasian and African American donor LCLs.

Purpose of the Study:

  • To investigate the genetic basis of differential apoptotic responses to gamma radiation in human LCLs.
  • To identify specific genes and genetic variations influencing cellular radiosensitivity.
  • To characterize the role of the AKT1 gene in radiation-induced apoptosis.

Main Methods:

  • Gamma radiation exposure of human EBV-transformed B lymphocyte cell lines (LCLs).

Related Experiment Videos

  • Quantification of apoptosis levels across diverse donor populations.
  • Genotyping and protein expression analysis, focusing on MDM2 and AKT1 genes.

    • Main Results:

    • A normal distribution of apoptosis was observed (median 35.5%, range 12-58%).
    • The lowest responding LCLs (12-20% apoptosis) were exclusively from Caucasian donors.
    • Significant effects of SNPs in MDM2 and AKT1 were detected; highest AKT1 protein concentration and a Caucasian-specific haplotype were found in the lowest responding group.

    Conclusions:

    • The apoptotic response to gamma radiation is genetically determined, with population-specific differences.
    • The AKT1 gene and its associated haplotype play a role in modulating cellular radiosensitivity.
    • The developed assay is a valuable tool for identifying novel genetic variants impacting radiation response.