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Ubiquitination Defect of XIAP as Novel Susceptibility to Invasive Fungal Pneumonia

Rachel Ying Min Tan1, Zhi Xiong Chen2, J Sivaraman3

  • 1Division of Infectious Diseases, Department of Medicine, National University Hospital, Singapore.

The Journal of Infectious Diseases
|May 25, 2026
PubMed

Insights

Programmed cell death and protein degradation are vital for health. Mutations in the X-linked Inhibitor of Apoptosis Protein gene disrupt these processes, weakening immunity and causing fungal pneumonia.

Area of Science:

  • Cellular biology
  • Immunology
  • Genetics

Background:

  • Programmed cell death (apoptosis) and protein degradation (ubiquitination) are fundamental for maintaining cellular balance and tissue repair.
  • Dysregulation of these processes is implicated in various diseases.

Purpose of the Study:

  • To investigate the role of X-linked Inhibitor of Apoptosis Protein (XIAP) gene mutations in innate immunity and susceptibility to invasive fungal pneumonia.
  • To elucidate the connection between XIAP function, ubiquitination, apoptosis, and immune defense.

Main Methods:

  • Analysis of XIAP gene mutations.
  • Assessment of apoptosis and ubiquitination pathways.
  • Evaluation of innate immune responses.
  • Study of susceptibility to invasive fungal pneumonia in affected individuals.

Main Results:

  • Hypomorphic XIAP gene mutations were found to dysregulate ubiquitination and aggravate apoptosis.
  • These molecular disruptions led to suppressed innate immunity.
  • The compromised immune system predisposed individuals to severe invasive fungal pneumonia.

Conclusions:

  • XIAP plays a critical role in regulating ubiquitination and apoptosis, thereby maintaining innate immunity.
  • XIAP gene mutations significantly increase the risk of invasive fungal pneumonia by impairing cellular defense mechanisms.
Keywords:
ApoptosisImmunodeficiencyInvasive fungal infectionUbiquitinationXIAP

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