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Contribution of ADAM33 polymorphisms to the population risk of asthma
  1. J Blakey1,
  2. E Halapi2,
  3. U S Bjornsdottir3,
  4. A Wheatley1,
  5. S Kristinsson2,
  6. R Upmanyu2,
  7. K Stefansson2,
  8. H Hakonarson2,
  9. I P Hall1
  1. 1Division of Therapeutics and Molecular Medicine, University Hospital of Nottingham, Nottingham, UK
  2. 2DeCode Genetics, Reykjavik, Iceland
  3. 3Division of Allergy and Pulmonary Medicine, National University Hospital of Iceland, Iceland
  1. Correspondence to:
    Professor I P Hall
    Division of Therapeutics and Molecular Medicine, Queen’s Medical Centre, Nottingham NG7 2UH, UK;


Background:ADAM 33 is the first gene identified as a candidate for asthma by positional cloning techniques, with association studies reaching impressive statistical significance. It has a postulated role in myogenesis, airway modelling, and signalling via protein shedding. Concerns over the methodology of the initial study have led to several attempts at replication, with inconsistent results.

Method: To clarify the role of ADAM33 in determining the risk of asthma in the general population, new transmission disequilibrium and case-control studies were undertaken followed by a meta-analysis of all existing data.

Results: Studies in Icelandic and UK populations revealed no association when taken in isolation. The meta-analysis, however, showed that the F+1 and ST+7 variants were significantly associated with asthma in both types of study.

Conclusions: The additional risk imparted by this variation would account for 50 000 excess asthma cases in the UK alone. This study also demonstrates the size of study required to investigate such hypotheses adequately.

  • asthma
  • genetics
  • ADAM33

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  • Sources of support: none

  • Conflict of interest: none

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