PTTG 1 IP and MAML 3 , novel genomewide association study genes for severity of hyperresponsiveness in adult asthma

Abstract Background The severity of bronchial hyperresponsiveness ( BHR ) is a fundamental feature of asthma. The severity of BHR varies between asthmatics and is associated with lack of asthma control. The mechanisms underlying this trait are still unclear. This study aimed to identify genes associ...

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Published in:Allergy (Copenhagen) 2017-05, Vol.72 (5), p.792-801
Main Authors: Nieuwenhuis, M. A. E., Vonk, J. M., Himes, B. E., Sarnowski, C., Minelli, C., Jarvis, D., Bouzigon, E., Nickle, D. C., Laviolette, M., Sin, D., Weiss, S. T., van den Berge, M., Koppelman, G. H., Postma, D. S.
Format: Article
Language:English
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Summary:Abstract Background The severity of bronchial hyperresponsiveness ( BHR ) is a fundamental feature of asthma. The severity of BHR varies between asthmatics and is associated with lack of asthma control. The mechanisms underlying this trait are still unclear. This study aimed to identify genes associated with BHR severity, using a genomewide association study ( GWAS ) on the slope of BHR in adult asthmatics. Methods We performed a GWAS on BHR severity in adult asthmatics from the Dutch Asthma GWAS cohort ( n = 650), adjusting for smoking and inhaled corticosteroid use, and verified results in three other cohorts. Furthermore, we performed e QTL and co‐expression analyses in lung tissue. Results In the discovery cohort, one genomewide significant hit located in phosphodiesterase 4D, c AMP ‐specif ( PDE 4D ) and 26 SNP s with P ‐values < 1*10 −5 were found. None of our findings replicated in adult and childhood replication cohorts jointly. In adult cohorts separately, rs1344110 in pituitary tumour‐transforming 1 interacting protein ( PTTG 1 IP ) and rs345983 in Mastermind‐like 3 ( MAML 3 ) replicated nominally; minor alleles of rs345983 and rs1344110 were associated with less severe BHR and higher lung tissue gene expression. PTTG 1 IP showed significant co‐expression with pituitary tumour‐transforming 1 , the binding factor of PTTG 1lP , and with vimentin and E‐cadherin1 . MAML 3 co‐expressed significantly with Mastermind‐like 2 ( MAML 2 ), both involved in Notch signalling. Conclusions PTTG 1 IP and MAML 3 are associated with BHR severity in adult asthma. The relevance of these genes is supported by the e QTL analyses and co‐expression of PTTG 1lP with vimentin and E‐cadherin1 , and MAML 3 with MAML 2 .
ISSN:0105-4538
1398-9995
DOI:10.1111/all.13062