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Imaging of mtHyPer7, a Ratiometric Biosensor for Mitochondrial Peroxide, in Living Yeast Cells
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Extensive natural variation for cellular hydrogen peroxide release is genetically controlled.

Homa Attar1, Karen Bedard, Eugenia Migliavacca

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Area of Science:

  • Genetics and Genomics
  • Cellular Biology
  • Human Health and Disease

Background:

  • Natural DNA variation underlies individual differences in quantitative traits.
  • Genetic control over gene expression is established, but investigation into other cellular traits is limited.
  • Hydrogen peroxide (H2O2) release, a product of NADPH oxidase activity, is linked to various human disorders.

Purpose of the Study:

  • To investigate the natural variation of NADPH oxidase-dependent hydrogen peroxide (H2O2) release.
  • To identify genetic loci associated with H2O2 release variation.
  • To explore the role of H2O2 release in healthy individuals and Down Syndrome (DS).

Main Methods:

  • Assessed H2O2 release variation in lymphoblastoid cell lines (LCL) across family-based and population-based cohorts.
  • Conducted genome-wide linkage analysis to identify significant genetic loci.
  • Performed genome-wide association studies (GWAS) with imputation for enhanced marker resolution and replication analyses.

Main Results:

  • Observed substantial individual variation in H2O2 release, with 45% heritability in the CEPH-HapMap cohort.
  • Identified 2 genome-wide significant loci (Hsa12, Hsa15) and multiple significant/suggestive associations in GWAS.
  • Confirmed genetic signals on Hsa1, Hsa12, and Hsa15, with loci near the p67phox gene on Hsa1.
  • Found a highly significant decrease in H2O2 release in Down Syndrome individuals.

Conclusions:

  • Demonstrated strong evidence for genetic control over H2O2 release in LCLs of healthy and DS cohorts.
  • Suggests that cellular phenotypes, like H2O2 release, can serve as valuable proxies for dissecting complex human disorders.
  • Highlights the genetic basis of ROS production and its implications for human health.