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Case Reports
Journal Article
A New SERPINA-1 Missense Mutation Associated with Alpha-1 Antitrypsin Deficiency and Bronchiectasis.
Lung 2017 October
Alpha-1-antitrypsin deficiency (AATD) is a genetic condition caused by SERPINA1 mutations, which culminates into lower protease inhibitor activity in the serum and predisposes to emphysema. Clinical manifestations of AATD are often associated to ZZ (p.Glu342Lys) and SZ (p.Glu264Val) genotypes and less frequently to rare deficiency or null alleles in heterozygous and homozygous states. We report a case of a 52-year-old woman with bronchiectasis without other potential causes other than an electrophoresis that showed a decrease of alpha-1 globin band and AAT levels below the normal value (78 mg/dl; v.n. 90-200 mg/dl). No S or Z mutation was identified, but sequencing analysis found a novel missense variant Ile74Asn (c.221T > A) in heterozygous state on an M3 allele (Glu400Asp) in the exon 2 of the SERPINA-1gene, probably leading to a dysfunctional protein. This mutation has never been previously identified, and it is interesting to note the association with bronchiectasis in the absence of emphysema.
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