Manuel Mattheisen

Phenotypic and genetic heterogeneity among subjects with mild airflow obstruction in COPDGene

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Jin Hwa Lee
  • ,
  • Michael H Cho
  • ,
  • Merry-Lynn N McDonald
  • ,
  • Craig P Hersh
  • ,
  • Peter J Castaldi
  • ,
  • James D Crapo
  • ,
  • Emily S Wan
  • ,
  • Jennifer G Dy, Unknown
  • Yale Chang, Unknown
  • Elizabeth A Regan
  • ,
  • Megan Hardin, Unknown
  • Dawn L DeMeo
  • ,
  • Edwin K Silverman
  • ,
  • COPDGene Investigators
  • ,
  • Manuel Mattheisen

BACKGROUND: Chronic obstructive pulmonary disease (COPD) is characterized by marked phenotypic heterogeneity. Most previous studies have focused on COPD subjects with FEV1 < 80% predicted. We investigated the clinical and genetic heterogeneity in subjects with mild airflow limitation in spirometry grade 1 defined by the Global Initiative for chronic Obstructive Lung Disease (GOLD 1).

METHODS: Data from current and former smokers participating in the COPDGene Study (NCT00608764) were analyzed. K-means clustering was performed to explore subtypes within 794 GOLD 1 subjects. For all subjects with GOLD 1 and with each cluster, a genome-wide association study and candidate gene testing were performed using smokers with normal lung function as a control group. Combinations of COPD genome-wide significant single nucleotide polymorphisms (SNPs) were tested for association with FEV1 (% predicted) in GOLD 1 and in a combined group of GOLD 1 and smoking control subjects.

RESULTS: K-means clustering of GOLD 1 subjects identified putative "near-normal", "airway-predominant", "emphysema-predominant" and "lowest FEV1% predicted" subtypes. In non-Hispanic whites, the only SNP nominally associated with GOLD 1 status relative to smoking controls was rs7671167 (FAM13A) in logistic regression models with adjustment for age, sex, pack-years of smoking, and genetic ancestry. The emphysema-predominant GOLD 1 cluster was nominally associated with rs7671167 (FAM13A) and rs161976 (BICD1). The lowest FEV1% predicted cluster was nominally associated with rs1980057 (HHIP) and rs1051730 (CHRNA3). Combinations of COPD genome-wide significant SNPs were associated with FEV1 (% predicted) in a combined group of GOLD 1 and smoking control subjects.

CONCLUSIONS: Our results indicate that GOLD 1 subjects show substantial clinical heterogeneity, which is at least partially related to genetic heterogeneity.

Original languageEnglish
JournalKokyuukika
Volume108
Issue10
Pages (from-to)1469-80
Number of pages12
ISSN1347-0051
DOIs
Publication statusPublished - Oct 2014

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