The molecular evolution of the allatostatin precursor in cockroaches

Allatostatins (ASTs) of the Tyr/Phe-Xaa-Phe-Gly Leu/Ile-NH2 family are a group of insect neuropeptides that inhibit juvenile hormone biosynthesis by the corpora allata. We have obtained genomic DNA sequences that specify the preproallatostatin precursor for the cockroaches, Blatta orientalis, Blatte...

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Bibliographic Details
Published in:Peptides (New York, N.Y. : 1980) N.Y. : 1980), 1999-01, Vol.20 (1), p.11-22
Main Authors: Bellés, Xavier, Graham, Laurie A., Bendenab, William G., Ding, Qi, Edwards, John P., Weaver, Robert J., Tobe, Stephen S.
Format: Article
Language:English
Subjects:
Allatostatin
Amino Acid Sequence
Animals
Base Sequence
Blaberus craniifer
Blatta orientalis
Blattella germanica
Cockroach
Cockroaches - genetics
Evolution, Molecular
Molecular Sequence Data
Neuropeptide
Neuropeptides - classification
Neuropeptides - genetics
Peptide evolution
Phylogeny
Sequence Homology, Amino Acid
Sequence Homology, Nucleic Acid
Supella longipalpa
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Summary:Allatostatins (ASTs) of the Tyr/Phe-Xaa-Phe-Gly Leu/Ile-NH2 family are a group of insect neuropeptides that inhibit juvenile hormone biosynthesis by the corpora allata. We have obtained genomic DNA sequences that specify the preproallatostatin precursor for the cockroaches, Blatta orientalis, Blattella germanica, Blaberus craniifer and Supella longipalpa. The sequences obtained are similar to those of Diploptera punctata and Periplaneta americana reported previously. The precursors of all these cockroach species are similar in size, and the organization of the ASTs that they contain (there are 13 or 14, depending on the species) have been conserved. With the sequences of these precursors, and using the homologous sequence in the orthopteran Schistocerca gregaria as an outgroup, a phylogenetic analysis using parsimony was carried out. The dendrograms obtained from these analyses, using the amino acid as well as the nucleotide sequences, are comparable with current models for cockroach phylogeny. Parsimony analysis was also used to study the genealogy of the different ASTs within the same precursor. Results suggest that the AST sequences were generated through a process of internal gene duplication which occurred before these species diverged from each other in evolutionary time.
ISSN:0196-9781
1873-5169
DOI:10.1016/S0196-9781(98)00155-7