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The polymorphic AluYb8 insertion in the MUTYH gene is associated with reduced type 1 protein expression and reduced

Wenwen Guo1, Bixia Zheng, Zhenming Cai

  • 1Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China.

Plos One
|August 13, 2013
PubMed

Insights

The AluYb8MUTYH variant reduces mitochondrial MUTYH protein, impairing mitochondrial DNA repair and function. This finding links the variant to decreased mitochondrial homeostasis and increased age-related disease risk.

Area of Science:

  • Genetics
  • Molecular Biology
  • Mitochondrial Biology

Background:

  • The human MUTYH gene is crucial for base excision repair (BER), maintaining genomic stability.
  • Oxidized DNA bases, like 8-hydroxy-2'-deoxyguanosine (8-OH-dG), pose risks to DNA integrity.
  • The AluYb8 insertion in the MUTYH gene (AluYb8MUTYH) is a known risk factor for age-related diseases.

Purpose of the Study:

  • To investigate the impact of the AluYb8MUTYH variant on MUTYH protein localization and mitochondrial function.
  • To explore the association between the AluYb8MUTYH variant and mitochondrial DNA (mtDNA) maintenance.
  • To elucidate the role of this variant in age-related disease pathogenesis.

Main Methods:

  • Analysis of MUTYH protein localization in mitochondria.
  • Assessment of mtDNA maintenance in individuals with the AluYb8MUTYH variant.
  • Evaluation of functional mitochondrial mass.

Main Results:

  • The AluYb8MUTYH variant significantly reduces type 1 MUTYH protein in mitochondria.
  • This variant impairs mtDNA maintenance and reduces functional mitochondrial mass in homozygous individuals.
  • A decrease in mitochondrial homeostasis was observed in individuals with the AluYb8MUTYH variant.

Conclusions:

  • The AluYb8MUTYH variant negatively impacts mitochondrial homeostasis by affecting the mitochondrial base excision repair (mtBER) system.
  • This impairment contributes to an increased risk of developing age-related diseases.
  • Understanding the role of AluYb8MUTYH in mtBER is vital for disease prevention strategies.

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