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    The prevalence of alpha-1 antitrypsin deficiency in Ireland.

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    Authors
    Carroll, Tomas P
    O'Connor, Catherine A
    Floyd, Olwen
    McPartlin, Joseph
    Kelleher, Dermot P
    O'Brien, Geraldine
    Dimitrov, Borislav D
    Morris, Valerie B
    Taggart, Clifford C
    McElvaney, Noel G
    Issue Date
    2011-07-13
    
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    Citation
    Respiratory Research. 2011 Jul 13;12(1):91
    URI
    http://hdl.handle.net/10147/141059
    Abstract
    Abstract Background Alpha-1 antitrypsin deficiency (AATD) results from mutations in the SERPINA1 gene and classically presents with early-onset emphysema and liver disease. The most common mutation presenting with clinical evidence is the Z mutation, while the S mutation is associated with a milder plasma deficiency. AATD is an under-diagnosed condition and the World Health Organisation recommends targeted detection programmes for AATD in patients with chronic obstructive pulmonary disease (COPD), non-responsive asthma, cryptogenic liver disease and first degree relatives of known AATD patients. Methods We present data from the first 3,000 individuals screened following ATS/ERS guidelines as part of the Irish National Targeted Detection Programme (INTDP). We also investigated a DNA collection of 1,100 individuals randomly sampled from the general population. Serum and DNA was collected from both groups and mutations in the SERPINA1 gene detected by phenotyping or genotyping. Results The Irish National Targeted Detection Programme identified 42 ZZ, 44 SZ, 14 SS, 430 MZ, 263 MS, 20 IX and 2 rare mutations. Analysis of 1,100 randomly selected individuals identified 113 MS, 46 MZ, 2 SS and 2 SZ genotypes. Conclusion Our findings demonstrate that AATD in Ireland is more prevalent than previously estimated with Z and S allele frequencies among the highest in the world. Furthermore, our targeted detection programme enriched the population of those carrying the Z but not the S allele, suggesting the Z allele is more important in the pathogenesis of those conditions targeted by the detection programme.
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