Abstract
To elucidate the molecular background of IgE production in early infancy, we analyzed the nucleotide sequences of 36 VH-Cepsilon transcripts expressed in PBL from three infants with allergic diseases. We detected transcripts derived from VH1, VH3, VH4 gene family members, and no bias was observed in the usage of particular VH gene family. However, some VH members, VH1; 1-46, 1-69, VH3; 3-11, 3-21, VH4; 4-39, 4-59 were frequently seen and thus notable. VH4 gene was dominant in one patient with severe atopic dermatitis and food allergy, suggesting the involvement of this gene in pathogenesis of the disease. Even a limited number of clones were analyzed, we also found highly homologous VH1-69 derived sequences from all the three patients, which share the same somatic mutations or polymorphic variations in complementarity-determining region (CDR) 1, and 2 with the same CDR3 (D-JH) sequences including the junctions. These findings might suggest that a rather limited VH gene might be rearranged for specific IgE in early life.
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