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Title: Origin and Functional Diversification of an Amphibian Defense Peptide Arsenal
Authors: Roelants, Kim
Fry, Bryan G.
Ye, Lumeng
Stijlemans, Benoit
Brys, Lea
Kok, Philippe
Schoofs, Liliane
Cornelis, Pierre
Bossuyt, Franky
Issue Date: 2013
Source: PLOS GENETICS, 9 (8), (ART N° e1003662)
Abstract: The skin secretion of many amphibians contains an arsenal of bioactive molecules, including hormone-like peptides (HLPs) acting as defense toxins against predators, and antimicrobial peptides (AMPs) providing protection against infectious microorganisms. Several amphibian taxa seem to have independently acquired the genes to produce skin-secreted peptide arsenals, but it remains unknown how these originated from a non-defensive ancestral gene and evolved diverse defense functions against predators and pathogens. We conducted transcriptome, genome, peptidome and phylogenetic analyses to chart the full gene repertoire underlying the defense peptide arsenal of the frog Silurana tropicalis and reconstruct its evolutionary history. Our study uncovers a cluster of 13 transcriptionally active genes, together encoding up to 19 peptides, including diverse HLP homologues and AMPs. This gene cluster arose from a duplicated gastrointestinal hormone gene that attained a HLP-like defense function after major remodeling of its promoter region. Instead, new defense functions, including antimicrobial activity, arose by mutation of the precursor proteins, resulting in the proteolytic processing of secondary peptides alongside the original ones. Although gene duplication did not trigger functional innovation, it may have subsequently facilitated the convergent loss of the original function in multiple gene lineages (subfunctionalization), completing their transformation from HLP gene to AMP gene. The processing of multiple peptides from a single precursor entails a mechanism through which peptide-encoding genes may establish new functions without the need for gene duplication to avoid adaptive conflicts with older ones.
Notes: Roelants, K (reprint author),Vrije Univ Brussel, Amphibian Evolut Lab, Dept Biol, Brussels, Belgium.
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ISSN: 1553-7404
e-ISSN: 1553-7404
DOI: 10.1371/journal.pgen.1003662
ISI #: 000323830300017
Category: A1
Type: Journal Contribution
Validations: ecoom 2014
Appears in Collections:Research publications

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