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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
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ZNF341 controls STAT3 expression and thereby immunocompetence.

Stefanie Frey-Jakobs1, Julia M Hartberger1, Manfred Fliegauf1

  • 1Center for Chronic Immunodeficiency, Medical Center University of Freiburg, Faculty of Medicine, University of Freiburg, Germany.

Science Immunology
|June 17, 2018
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Summary
This summary is machine-generated.

Mutations in ZNF341 cause a STAT3-like immune disorder. This previously unrecognized regulator is essential for immune homeostasis, impacting STAT3 expression and T helper cell numbers.

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Area of Science:

  • Immunology
  • Genetics
  • Molecular Biology

Background:

  • Signal transducer and activator of transcription 3 (STAT3) is crucial for immune homeostasis.
  • STAT3 dysfunction is implicated in diseases like autosomal-dominant hyper-immunoglobulin E syndrome (AD-HIES).
  • Autosomal-recessive disorders with AD-HIES-like phenotypes require further investigation into underlying genetic causes.

Purpose of the Study:

  • Investigate the genetic basis of an autosomal-recessive disorder mimicking AD-HIES.
  • Identify the molecular mechanisms causing immunodeficiency, infections, and skeletal abnormalities in affected families.
  • Determine the role of ZNF341 in regulating STAT3 and immune homeostasis.

Main Methods:

  • Clinical evaluation of patients from four consanguineous families with AD-HIES-like symptoms.
  • Genetic analysis to identify mutations in affected individuals.
  • Assessment of STAT3 expression and T helper 17 cell numbers.
  • Functional studies of ZNF341, including promoter binding and transcriptional activation assays.

Main Results:

  • Patients exhibited reduced STAT3 expression and diminished T helper 17 cell counts.
  • Two distinct homozygous nonsense mutations in the ZNF341 gene were identified.
  • Wild-type ZNF341 activates the STAT3 promoter, while mutant variants show impaired function due to nuclear translocation defects.
  • ZNF341 mutations were linked to the observed STAT3-like phenotype in an autosomal-recessive manner.

Conclusions:

  • Nonsense mutations in ZNF341 are responsible for a STAT3-like autosomal-recessive disorder.
  • ZNF341 is a novel regulator of immune homeostasis, essential for controlling STAT3 expression.
  • Understanding ZNF341's role offers new insights into immune dysregulation and potential therapeutic targets.