Molecular evolution of neuropeptides in the genus Drosophila.

Genome Biology
Christian Wegener, Anton Gorbashov

Abstract

Neuropeptides comprise the most diverse group of neuronal signaling molecules. They often occur as multiple sequence-related copies within single precursors (the prepropeptides). These multiple sequence-related copies have not arisen by gene duplication, and it is debated whether they are mutually redundant or serve specific functions. The fully sequenced genomes of 12 Drosophila species provide a unique opportunity to study the molecular evolution of neuropeptides. We data-mined the 12 Drosophila genomes for homologs of neuropeptide genes identified in Drosophila melanogaster. We then predicted peptide precursors and the neuropeptidome, and biochemically identified about half of the predicted peptides by direct mass spectrometric profiling of neuroendocrine tissue in four species covering main phylogenetic lines of Drosophila. We found that all species have an identical neuropeptidome and peptide hormone complement. Calculation of amino acid distances showed that ortholog peptide copies are highly sequence-conserved between species, whereas the observed sequence variability between peptide copies within single precursors must have occurred prior to the divergence of the Drosophila species. We provide a first genomic and chemic...Continue Reading

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Methods Mentioned

BETA
amidation

Software Mentioned

GraphPad Prism
Fasta
GeneDoc
Data Explorer
Excel
MEGA3
BLAST
GraphPad
ClustalW
GENSCAN

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