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Related Experiment Videos

Interleukin 9: a candidate gene for asthma

N C Nicolaides1, K J Holroyd, S L Ewart

  • 1Magainin Institute of Molecular Medicine, Magainin Pharmaceuticals, Plymouth Meeting, PA 19462, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 16, 1997
PubMed
Summary

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Researchers identified a gene linked to bronchial hyperresponsiveness in mice, a key asthma risk factor. Reduced expression of Interleukin 9 (IL-9) in hyporesponsive mice suggests its role in asthma development.

Area of Science:

  • Genetics
  • Immunology
  • Pulmonology

Background:

  • Asthma is a complex, heritable inflammatory airway disease.
  • Genetic factors on human chromosome 5q31-q33 are implicated in asthma susceptibility.
  • Candidate genes for asthma risk require investigation in animal models.

Purpose of the Study:

  • To identify genes contributing to bronchial hyperresponsiveness and atopy.
  • To investigate the role of Interleukin 9 (IL-9) in asthma pathogenesis.
  • To analyze the genetic basis of bronchial responsiveness in mice.

Main Methods:

  • Assessed bronchial responsiveness as a quantitative trait in mice.
  • Mapped quantitative trait loci (QTL) for bronchial responsiveness.
  • Analyzed Interleukin 9 (IL-9) gene expression in relation to bronchial responsiveness.

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Main Results:

  • Bronchial responsiveness in mice was linked to chromosome 13.
  • Interleukin 9 (IL-9) is located within the linked chromosomal region.
  • IL-9 expression was significantly reduced in bronchial hyporesponsive mice.
  • QTL sequences influenced IL-9 expression levels.

Conclusions:

  • Interleukin 9 (IL-9) plays a potential role in the pathogenesis of bronchial hyperresponsiveness.
  • IL-9 may act as a risk factor for asthma development.
  • Genetic regulation of IL-9 influences asthma-related traits.