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Vitamin D-responsive SGPP2 variants associated with lung cell expression and lung function.

Brian J Reardon1, Joyanna G Hansen, Ronald G Crystal

  • 1Division of Nutritional Sciences, Cornell University, 209 Savage Hall, Ithaca, NY 14853, USA. pac6@cornell.edu.

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Summary

Vitamin D influences lung health. This study identifies SGPP2 as a novel vitamin D-responsive gene linked to lung function (FEV1) through gene expression and genetic analyses.

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Area of Science:

  • Pulmonary Medicine
  • Genetics
  • Nutritional Science

Background:

  • Epidemiologic studies suggest a link between vitamin D and lung health, but underlying mechanisms remain unclear.
  • Understanding these mechanisms is crucial for public health and clinical interventions.
  • This research investigates the molecular pathways connecting vitamin D to lung function.

Purpose of the Study:

  • To explore the mechanisms by which vitamin D affects lung health.
  • To identify specific genes and genetic variants influenced by vitamin D that relate to pulmonary function.
  • To validate these findings in population-based cohorts.

Main Methods:

  • Gene expression analysis in small airway epithelial cells correlated with serum 25(OH)D levels.
  • Expression quantitative trait loci (eQTL) analysis in lung tissue for candidate genes.
  • Association studies of sequence variants with pulmonary function (FEV1) in the Health, Aging, and Body Composition (Health ABC) and Framingham Heart Study (FHS) cohorts.

Main Results:

  • Thirteen candidate genes showed differential expression based on serum 25(OH)D levels.
  • A genome-wide significant eQTL association was found for SGPP2.
  • Single nucleotide polymorphisms (SNPs) in SGPP2 were associated with FEV1 in both European- and African-Americans, with replication in the FHS cohort. Additional gene associations with FEV1 were observed.

Conclusions:

  • SGPP2, encoding sphingosine-1-phosphate phosphatase, is identified as a novel vitamin D-responsive gene associated with lung function.
  • These findings provide a molecular link between vitamin D and pulmonary health.
  • Further research is warranted to elucidate the precise role of SGPP2 and other identified genes in lung physiology and disease.