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Rule-Based Models of the Interplay between Genetic and Environmental Factors in Childhood Allergy

Bornelöv, Susanne (author)
Uppsala universitet,Beräknings- och systembiologi,Science for Life Laboratory, SciLifeLab
Saaf, Annika (author)
Melen, Erik (author)
Karolinska Institutet
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Bergstrom, Anna (author)
Karolinska Institutet
Moghadam, Behrooz Torabi (author)
Uppsala universitet,Beräknings- och systembiologi,Science for Life Laboratory, SciLifeLab
Pulkkinen, Ville (author)
Acevedo, Nathalie (author)
Karolinska Institutet
Pietras, Christina Orsmark (author)
Ege, Markus (author)
Braun-Fahrlaender, Charlotte (author)
Riedler, Josef (author)
Doekes, Gert (author)
Kabesch, Michael (author)
van Hage, Marianne (author)
Karolinska Institutet
Kere, Juha (author)
Karolinska Institutet
Scheynius, Annika (author)
Karolinska Institutet
Soderhall, Cilla (author)
Karolinska Institutet
Pershagen, Goran (author)
Karolinska Institutet
Komorowski, Jan (author)
Uppsala universitet,Beräknings- och systembiologi,Science for Life Laboratory, SciLifeLab
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 (creator_code:org_t)
2013-11-19
2013
English.
In: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 8:11, s. e80080-
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Both genetic and environmental factors are important for the development of allergic diseases. However, a detailed understanding of how such factors act together is lacking. To elucidate the interplay between genetic and environmental factors in allergic diseases, we used a novel bioinformatics approach that combines feature selection and machine learning. In two materials, PARSIFAL (a European cross-sectional study of 3113 children) and BAMSE (a Swedish birth-cohort including 2033 children), genetic variants as well as environmental and lifestyle factors were evaluated for their contribution to allergic phenotypes. Monte Carlo feature selection and rule based models were used to identify and rank rules describing how combinations of genetic and environmental factors affect the risk of allergic diseases. Novel interactions between genes were suggested and replicated, such as between ORMDL3 and RORA, where certain genotype combinations gave odds ratios for current asthma of 2.1 (95% CI 1.2-3.6) and 3.2 (95% CI 2.0-5.0) in the BAMSE and PARSIFAL children, respectively. Several combinations of environmental factors appeared to be important for the development of allergic disease in children. For example, use of baby formula and antibiotics early in life was associated with an odds ratio of 7.4 (95% CI 4.5-12.0) of developing asthma. Furthermore, genetic variants together with environmental factors seemed to play a role for allergic diseases, such as the use of antibiotics early in life and COL29A1 variants for asthma, and farm living and NPSR1 variants for allergic eczema. Overall, combinations of environmental and life style factors appeared more frequently in the models than combinations solely involving genes. In conclusion, a new bioinformatics approach is described for analyzing complex data, including extensive genetic and environmental information. Interactions identified with this approach could provide useful hints for further in-depth studies of etiological mechanisms and may also strengthen the basis for risk assessment and prevention.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Medicinsk genetik (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Medical Genetics (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Lungmedicin och allergi (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Respiratory Medicine and Allergy (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Arbetsmedicin och miljömedicin (hsv//swe)
MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Occupational Health and Environmental Health (hsv//eng)

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