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Area of Science:

  • Biomedical research
  • Genetics
  • Molecular biology

Background:

  • Mice are a primary model organism in biomedical research.
  • Selenoproteins play crucial roles in various physiological processes.
  • Understanding gene loss tolerance is vital for comparative genomics.

Purpose of the Study:

  • To analyze the tolerance to loss-of-function (LoF) of selenoprotein genes in mice and humans.
  • To compare LoF tolerance between species using mouse knockout data and human variant frequencies.
  • To identify species-specific differences in selenoprotein physiological importance.

Main Methods:

  • Analysis of mouse knockout data for selenoprotein genes.
  • Examination of human population data for loss-of-function variants in selenoprotein genes.
  • Comparative analysis of gene LoF tolerance and associated phenotypes between humans and mice.

Main Results:

  • General correspondence in LoF tolerance for some selenoprotein genes (e.g., GPX1, GPX2) and intolerance for others (e.g., TXNRD1, SELENOT) between humans and mice.
  • Significant differences observed: humans are intolerant to iodothyronine deiodinase loss, unlike mice with mild phenotypes.
  • Loss of TXNRD2 and GPX4 is lethal in mice but potentially tolerated in humans; first human SELENOP variants identified.

Conclusions:

  • Species-specific differences exist in the physiological importance of selenoproteins.
  • Comparative analysis reveals distinct tolerances to gene LoF between human and mouse models.
  • Findings underscore the need for caution when extrapolating mouse model results to human physiology for selenoproteins.