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Related Concept Videos

The Ratio of X Chromosome to Autosomes02:45

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In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
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Rethinking disomy: Autosomal expression bias.

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Autosomal random monoallelic expression (aRMAE) explains why some individuals with disease-causing genetic variants don't get sick. This phenomenon, where only one gene copy is active in some cells, is crucial for understanding genetic conditions.

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Area of Science:

  • Genetics
  • Epigenetics
  • Molecular Biology

Background:

  • Humans possess 22 pairs of autosomes and sex chromosomes, with equal maternal and paternal genetic contributions.
  • Mendelian genetics assumes equal gene expression from both autosomal copies, guiding disease variant classification (dominant/recessive).
  • Incomplete penetrance, where carriers of disease variants remain unaffected, is traditionally attributed to environmental, polygenic, or mosaic effects.

Purpose of the Study:

  • To review autosomal random monoallelic expression (aRMAE) from multiple perspectives.
  • To explore aRMAE's role in explaining incomplete penetrance in genetic conditions.
  • To propose a new framework for understanding aRMAE.

Main Methods:

  • Literature review encompassing historical, biochemical, genetic, and epigenetic data.
  • Analysis of disease-influencing factors related to gene expression.
  • Synthesis of findings to propose a novel conceptual framework.

Main Results:

  • aRMAE, where one parental allele is preferentially expressed in a subset of cells, is increasingly recognized.
  • This phenomenon offers a biochemical explanation for incomplete penetrance.
  • Evidence suggests aRMAE influences the manifestation of various genetic disorders.

Conclusions:

  • aRMAE provides a significant mechanism for understanding variability in genetic disease expression.
  • Further research into aRMAE is essential for advancing genetic diagnostics and therapeutics.
  • A new framework integrating aRMAE is proposed for a comprehensive view of genetic inheritance and disease.