The structure of a gene coding for bombinin-like peptides (BLP) in Bombina
orientalis was determined. It comprises two exons separated by a 1337 bp in
tron. Exon 1 codes for the signal peptide, while exon 2 contains the geneti
c information for BLP-7 and a bombinin H-type peptide (GH-2). The promoter
region contains putative recognition sites for nuclear factors, such as NF-
IL6 and NF-kappaB. The analysis of the structure of this gene, compared wit
h that of the previously reported BLP-3 gene sequence, suggests the occurre
nce of a gene duplication event, rather than an alternative splicing mechan
ism, which leads to the generation of both inter- and intra-families variab
ility in this class of cytolytic peptides. Furthermore, walking chromosome
analysis indicates that this gene family is not densely clustered. (C) 2000
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