Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Smoking Dysregulates the Human Airway Basal Cell Transcriptome at COPD-linked Risk Locus 19q13.2

ABSTRACT: Rationale: Genome-wide association studies (GWAS) and candidate gene studies have identified a number of loci linked to susceptibility of chronic obstructive pulmonary disease (COPD), a smoking-related disorder that originates in the airway epithelium. Objectives: Since airway basal cell (BC) stem/progenitor cells exhibit the earliest abnormalities associated with smoking (hyperplasia, squamous metaplasia), we hypothesized that smoker BC have a dysregulated transcriptome linked, in part, to known GWAS/candidate gene loci. Methods: Massive parallel RNA sequencing was used to compare the transcriptome of BC purified from the airway epithelium of healthy nonsmokers (n=10) and smokers (n=7). The chromosomal location of the differentially expressed genes was compared to loci identified by GWAS and candidate gene studies to confer risk for COPD. Measurements and Main Results: Smoker BC have 676 known genes differentially expressed compared to nonsmoker BC, dominated by smoking up-regulation. Strikingly, 166 (25%) of these genes are located on chromosome 19, with 13 localized to 19q13.2 (p<10-4 compared to chance), including TGFB1, LTBP4, EGLN2 and NFKBIB, genes associated with risk for COPD. Conclusions: These observations provide the first direct link of known genetic risks for smoking-related lung disease with the specific population of lung cells that undergoes the earliest changes associated with smoking. The human airway basal cell transcriptome of 7 smokers versus 10 nonsmokers was compared using massive parallel RNA sequencing (Illumina HiSeq 2000).

ORGANISM(S): Homo sapiens

SUBMITTER: Yael Strulovici-Barel

PROVIDER: E-GEOD-47718 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Smoking dysregulates the human airway basal cell transcriptome at COPD risk locus 19q13.2.

Ryan Dorothy M DM Vincent Thomas L TL Salit Jacqueline J Walters Matthew S MS Agosto-Perez Francisco F Shaykhiev Renat R Strulovici-Barel Yael Y Downey Robert J RJ Buro-Auriemma Lauren J LJ Staudt Michelle R MR Hackett Neil R NR Mezey Jason G JG Crystal Ronald G RG

PloS one 20140203 2

Genome-wide association studies (GWAS) and candidate gene studies have identified a number of risk loci associated with the smoking-related disease COPD, a disorder that originates in the airway epithelium. Since airway basal cell (BC) stem/progenitor cells exhibit the earliest abnormalities associated with smoking (hyperplasia, squamous metaplasia), we hypothesized that smoker BC have a dysregulated transcriptome, enriched, in part, at known GWAS/candidate gene loci. Massive parallel RNA sequen ...[more]

PMID: 24498427

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Project description:In the process of seeking novel lung host defense regulators by analyzing genome-wide RNA sequence data from normal human airway epithelium, we detected expression of POU2AF1, a known transcription co-factor previously thought to be expressed only in lymphocytes. Lymphocyte contamination of human airway epithelial samples obtained by bronchoscopy and brushing was excluded by immunohistochemistry staining, the observation of up-regulation of POU2AF1 in purified airway basal stem/progenitor cells undergoing differentiation and analysis of differentiating single basal cell clones. Lentivirus-mediated up-regulation of POU2AF1 in airway basal cells induced up-regulation of host defense genes, including MX1, IFIT3, IFITM and known POU2AF1 downstream genes HLA-DRA, ID2, ID3, IL6, BCL6. Interestingly, expression of these genes paralleled changes of POU2AF1 expression during airway epithelium differentiation in vitro, suggesting POU2AF1 helps to maintain a "host defense tone" even in pathogen-free condition. Cigarette smoke, a known risk factor for airway infection, suppressed POU2AF1 expression both in vivo in humans and in vitro in human airway epithelial cultures, accompanied by deregulation of POU2AF1 downstream genes. Finally, enhancing POU2AF1 expression in human airway epithelium attenuated the suppression of host defense genes by smoking. Together, these findings suggest a novel function of POU2AF1 as a potential regulator of host defense genes in the human airway epithelium. Methods: Massive parallel RNA sequencing was used to compare the transcriptome of lentivirus mediated POU2AF1 or RFP (control) gene expression in human primary airway epithelial cells (3 samples per group). Uninfected basal cell was used as a further control. Conclusions: The genes up-regulated by POU2AF1 in human airway epithelial cells are mainly related to the intracellular or extracellular anti-pathogen response, suggesting POU2AF1 plays a role in airway epithelial host defense. By genome-wide-based screening, POU2AF1, a known lymphocyte transcription co-factor, was found to be expressed in human airway epithelium and regulate host defense genes. It might be a drug target as smoking-compromised host defense is associated with down-regulation of POU2AF1. In this Series, human airway epithelial cell transcriptomes (3 uninfected without treatment, 3 infected with lenti-RFP virus and 3 infected with lenti-POU2AF1 virus) were compared using massive parallel RNA sequencing (Illumina HiSeq 2000).

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Dataset Information

Smoking Dysregulates the Human Airway Basal Cell Transcriptome at COPD-linked Risk Locus 19q13.2

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Smoking dysregulates the human airway basal cell transcriptome at COPD risk locus 19q13.2.

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