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Related Experiment Videos

Genetic instability in human T-lymphocytes

R J Albertini1, J A Nicklas, T R Skopek

  • 1University of Vermont Genetic Toxicology Laboratory, 32 N. Prospect St., Burlington, VT 05401, USA.

Mutation Research
|August 1, 1998
PubMed
Summary
This summary is machine-generated.

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Individuals with outlier HPRT mutant frequencies exhibit a mutator phenotype. This involves in vivo expansion of T-cell receptor clones with multiple HPRT mutations, explaining variations in human somatic cell mutation rates.

Area of Science:

  • Somatic cell mutation
  • Human genetics
  • Immunology

Background:

  • Hypoxanthine-guanine phosphoribosyltransferase (HPRT) gene mutations in T-lymphocytes measure in vivo mutation induction in human somatic cells.
  • Background HPRT mutant frequency (MF) shows significant inter-individual variation, with outliers exhibiting MF > 100x10-6.
  • Elevated MF in outliers is linked to in vivo expansion of mutant cells with identical T-cell receptor (TCR) gene rearrangement patterns.

Purpose of the Study:

  • To investigate the underlying cause of elevated HPRT MF in individuals with outlier values.
  • To determine if expanding T-cell clones in these individuals possess a mutator phenotype.
  • To explore the contribution of T-cell mutator phenotypes to HPRT MF variation in the human population.

Main Methods:

Related Experiment Videos

  • Analysis of HPRT mutations in T-lymphocytes.
  • T-cell receptor (TCR) gene rearrangement pattern analysis to identify clonal expansion.
  • Characterization of mutations within expanding TCR clones.

Main Results:

  • A well-studied outlier individual showed an in vivo expanding TCR clone with multiple distinct HPRT mutations.
  • This expanding clone demonstrated a mutator phenotype, accumulating numerous HPRT mutations.
  • Identification of other individuals with similar T-cell mutator phenotypes.

Conclusions:

  • The in vivo expansion of T-cell clones with a mutator phenotype is a significant factor contributing to extreme variations in HPRT mutant frequencies in the human population.
  • This finding sheds light on the mechanisms driving somatic mutation rate variability.
  • Understanding T-cell mutator phenotypes is crucial for interpreting human mutation studies.