Beta-lactam antibiotics include penicillin and cephalosporins and are among the most prescribed antibiotics. This category of drugs is the most involved in immediate allergic manifestations with 2% reactions in treated subjects and a fatal outcome in 1/50000 treatments. Reactions are IgE-mediated and have a considerable but unknown genetic origin, revealed by studies in groups of different ethnical origins in the same geographical region. There are also some families with a high frequency of allergic reactions without identified Mendelian inheritance. The purpose of this study is to identify predictive risk factors associated to immediate allergic reactions against beta-lactam antibiotics with a pangenomic approach. A secondary purpose is to identify rare predictive factors with homozygosity mapping and exome sequencing in various families with high risk of allergy to beta-lactam antibiotics.
Study Type
OBSERVATIONAL
Enrollment
2,356
Analysis of genetic polymorphisms predictive of risk of beta-lactam immediate allergy
Common (\>10%) or rare (1-10%) genetic polymorphisms in patients with beta-lactam immediate allergy
Time frame: day 0
Analysis of allelic homozygosity linked to allergen response, in more than 2 allergic individuals of the same family
Allelic homozygosity in one or more regions of genome with one or more genes involved in allergen response, in more than 2 individuals affected by beta-lactam allergy in the same family
Time frame: day 0
Severity of allergic reaction
evaluated during clinical examination
Time frame: day 0
Reactivity to skin test
Time frame: day 0
Serum concentration of specific IgE
Time frame: day 0
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