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Why haploinsufficiency persists.

Summer A Morrill1,2, Angelika Amon3,2,4,5

  • 1David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139.

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|May 31, 2019
PubMed
Summary
This summary is machine-generated.

Haploinsufficiency, where one gene copy reduces fitness, arises from gene overexpression toxicity and cellular process limitations. This dual pressure stabilizes gene dosage, explaining its evolutionary persistence.

Keywords:
dosage sensitivitygene dosagehaploinsufficiency

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Area of Science:

  • Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Haploinsufficiency is a decrease in organismal fitness when one copy of a gene is deleted in diploid organisms.
  • Understanding the genetic and evolutionary basis of haploinsufficiency is crucial for comprehending gene dosage effects.

Purpose of the Study:

  • To investigate the origins of haploinsufficiency by creating a comprehensive gene dosage sensitivity dataset.
  • To determine the factors contributing to haploinsufficiency, including gene expression limits and cellular process requirements.

Main Methods:

  • Generated a comprehensive dataset of gene dosage sensitivity for genes under their native promoters.
  • Analyzed gene expression levels and cell-to-cell variability in relation to gene copy number.

Main Results:

  • Haploinsufficient genes are limited by the toxicity of their overexpression.
  • These genes are also critical for cellular processes, making them limiting when present in only one copy.
  • Haploinsufficient genes exhibit stabilized dosage, with narrow cell-to-cell expression variability.

Conclusions:

  • Haploinsufficiency results from a balance between the toxicity of gene overexpression and the necessity of gene function.
  • A dosage-stabilizing mechanism maintains haploinsufficient genes under evolutionary pressure.
  • The proposed dosage-stabilizing hypothesis explains the persistence of haploinsufficiency over evolutionary time.