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Modifier genetics: cystic fibrosis.

Garry R Cutting1

  • 1Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-3914, USA. gcutting@jhmi.edu

Annual Review of Genomics and Human Genetics
|August 30, 2005
PubMed
Summary

Cystic fibrosis (CF) is a genetic disorder impacting 30,000 Americans. While the CF transmembrane conductance regulator (CFTR) gene is known, other genetic factors significantly influence CF disease variability and outcomes.

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Area of Science:

  • Genetics
  • Pulmonology
  • Medical Research

Background:

  • Cystic fibrosis (CF) is a lethal autosomal recessive disorder affecting approximately 30,000 individuals in the US.
  • The CF transmembrane conductance regulator (CFTR) gene, identified 15 years ago, is the primary cause of CF.
  • Significant variability in CF phenotypes among individuals with identical CFTR genotypes suggests the influence of other genetic factors.

Purpose of the Study:

  • To investigate the genetic factors contributing to the variability of cystic fibrosis (CF) phenotypes.
  • To identify modifier genes that influence disease outcome in CF patients.
  • To understand the genetic basis of differing disease severity and manifestations in CF.

Main Methods:

  • Review of published studies investigating candidate genes and CF phenotypes.
  • Analysis of associations between genetic variations and CF disease aspects.
  • Examination of twin and sibling studies to assess the role of genetic factors in CF manifestations.

Main Results:

  • Previous studies have reported associations between candidate genes and CF phenotypes, but no definitive modifier gene has been identified.
  • Genetic factors play a substantial role in the intestinal manifestations of CF, as indicated by twin and sibling studies.
  • Identifying genetic factors influencing pulmonary disease, the main cause of mortality in CF, remains a significant challenge.

Conclusions:

  • Genetic factors independent of CFTR significantly influence cystic fibrosis outcomes.
  • Further research is needed to identify specific modifier genes that contribute to CF disease variability.
  • Understanding these genetic modifiers is crucial for improving treatment strategies and patient outcomes in cystic fibrosis.

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