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Related Experiment Videos

Allele-specific in situ hybridization (ASISH).

R Ohlsson1, K Svensson, H Cui

  • 1Department of Animal Development and Genetics, Uppsala University, Norbyvägen, Uppsala, Sweden.

Methods in Molecular Biology (Clifton, N.J.)
|July 5, 2003
PubMed
Summary

Diploid genomes utilize evolutionary strategies to express only one allele. Three main categories of monoallelic gene expression exist: random inactivation, allelic exclusion, and genomic imprinting.

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Area of Science:

  • Genetics
  • Evolutionary Biology

Background:

  • Diploid genomes exhibit complex evolutionary strategies for gene expression.
  • Monoallelic gene expression, where only one allele is active, is an increasingly recognized phenomenon.

Purpose of the Study:

  • To categorize and differentiate the mechanisms of monoallelic gene expression.
  • To highlight the prevalence and detection methods of different monoallelic expression patterns.

Main Methods:

  • Classification of monoallelic expression into random inactivation, allelic exclusion, and genomic imprinting based on inheritance and cell division stability.
  • Analysis of RNA from homogenized tissue to detect monoallelic expression patterns.

Main Results:

  • Monoallelic gene expression occurs through random inactivation, allelic exclusion, or genomic imprinting.

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  • Genomic imprinting is currently the most numerous category of monoallelically expressed genes.
  • Traditional methods may overlook random monoallelic expression and tissue-specific imprinting.

    • Conclusions:

    • Understanding the distinct mechanisms of monoallelic gene expression is crucial.
    • Further research is needed to refine detection methods for all forms of monoallelic expression, including random inactivation.