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Connexin Mutations and Hereditary Diseases.

Yue Qiu1, Jianglin Zheng2, Sen Chen1

  • 1Institute of Otorhinolaryngology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.

International Journal of Molecular Sciences
|April 23, 2022
PubMed
Summary
This summary is machine-generated.

Connexin mutations cause hereditary diseases affecting multiple organs. Animal models reveal shared pathogenic mechanisms involving cellular changes and altered gap junction function, impacting gene therapy efficacy for dominant mutations.

Keywords:
congenital cataractcongenital heart diseasesconnexingap junctiongene mutationhereditary deafnesshereditary skin diseases

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Area of Science:

  • Genetics and Molecular Biology
  • Cell Biology
  • Pathology

Background:

  • Inherited diseases linked to connexin mutations affect diverse organs, including hereditary deafness, cataracts, heart conditions, skin disorders, and Charcot-Marie-Tooth disease (CMT1X).
  • Connexins exhibit high structural homology, suggesting common pathogenic mechanisms across various connexin-related hereditary diseases.
  • Animal models (knockout and knock-in) are crucial for investigating the pathology and pathogenesis of these multi-organ diseases.

Purpose of the Study:

  • To analyze similarities and differences in pathology and pathogenesis of connexin-related hereditary diseases using animal models.
  • To identify shared pathogenic mechanisms underlying diseases affecting the ear, eye, heart, skin, and peripheral nerves.
  • To investigate the role of dominant connexin mutations and their implications for gene therapy.

Main Methods:

  • Comparative analysis of pathology and pathogenesis in various animal models of connexin-related diseases.
  • In vivo and in vitro studies to assess cellular proliferation, differentiation, and gap junction function.
  • Identification and characterization of specific connexin mutations, including dominant gain-of-function variants.

Main Results:

  • Connexin mutations in gap junction genes impact cellular proliferation and differentiation in affected organs.
  • Specific dominant mutations (e.g., Cx43 p.Gly60Ser, Cx32 variants) function as gain-of-function in vivo, contributing to disease onset.
  • Complete loss or altered gap junctional function, including permeability and electrical activity, was observed.

Conclusions:

  • Connexin mutations disrupt cellular processes and gap junction function, leading to multi-organ hereditary diseases.
  • Dominant gain-of-function mutations represent a significant mechanism in these inherited disorders, complicating gene therapy approaches.
  • Understanding these mechanisms is vital for developing effective treatments for connexin-related hereditary diseases.