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Project normal: defining normal variance in mouse gene expression.

C C Pritchard1, L Hsu, J Delrow

  • 1Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, WA 98109-1024, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 8, 2001
PubMed
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Understanding natural gene expression variability in mice is crucial for accurate research. This study quantifies normal variation in mouse kidney, liver, and testis tissues, highlighting the importance of replicate microarray experiments for reliable data interpretation.

Area of Science:

  • Genomics
  • Molecular Biology
  • Animal Models

Background:

  • Mice are vital model organisms in biological research.
  • Gene expression profiling is key to understanding biological processes.
  • Normal variation in mouse gene expression is not well understood.

Purpose of the Study:

  • To assess natural differences in murine gene expression.
  • To quantify transcript levels in kidney, liver, and testis of normal male mice.
  • To establish a baseline for mouse gene expression variability.

Main Methods:

  • Utilized a 5406-clone spotted cDNA microarray.
  • Quantitated transcript levels in kidney, liver, and testis from six normal male C57BL6 mice.
  • Employed ANOVA to compare inter-mouse variance with intra-tissue replicate variance.

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Main Results:

  • Statistically significant mouse variance was observed in 3.3% of kidney genes, 1.9% of testis genes, and 0.8% of liver genes.
  • Immune-modulated, stress-induced, and hormonally regulated genes were notably variable.
  • Significant gene expression variation was found in multiple tissues for some genes.

Conclusions:

  • Defined the baseline level of natural variability in mouse gene expression.
  • Emphasized the critical importance of conducting replicate microarray experiments.
  • Provided essential data for interpreting gene expression studies in mice.