Unravelling the evolution of the Allatostatin-Type A, KISS and Galanin Peptide-Receptor gene families in Bilaterians: insights from Anopheles Mosquitoes

Allatostatin type A receptors (AST-ARs) are a group of G-protein coupled receptors activated by members of the FGL-amide (AST-A) peptide family that inhibit food intake and development in arthropods. Despite their physiological importance the evolution of the AST-A system is poorly described and relatively few receptors have been isolated and functionally characterised in insects. The present study provides a comprehensive analysis of the origin and comparative evolution of the AST-A system. To determine how evolution and feeding modified the function of AST-AR the duplicate receptors in Anopheles mosquitoes, were characterised. Phylogeny and gene synteny suggested that invertebrate AST-A receptors and peptide genes shared a common evolutionary origin with KISS/GAL receptors and ligands. AST-ARs and KISSR emerged from a common gene ancestor after the divergence of GALRs in the bilaterian genome. In arthropods, the AST-A system evolved through lineage-specific events and the maintenance of two receptors in the flies and mosquitoes (Diptera) was the result of a gene duplication event. Speciation of Anophelesmosquitoes affected receptor gene organisation and characterisation of AST-AR duplicates (GPRALS1 and 2) revealed that in common with other insects, the mosquito receptors were activated by insect AST-A peptides and the iCa(2+)-signalling pathway was stimulated. GPRALS1 and 2 were expressed mainly in mosquito midgut and ovaries and transcript abundance of both receptors was modified by feeding. A blood meal strongly up-regulated expression of both GPRALS in the midgut (p < 0.05) compared to glucose fed females. Based on the results we hypothesise that the AST-A system in insects shared a common origin with the vertebrate KISS system and may also share a common function as an integrator of metabolism and reproduction. Highlights: AST-A and KISS/GAL receptors and ligands shared common ancestry prior to the protostome-deuterostome divergence. Phylogeny and gene synteny revealed that AST-AR and KISSR emerged after GALR gene divergence. AST-AR genes were present in the hemichordates but were lost from the chordates. In protostomes, AST-ARs persisted and evolved through lineage-specific events and duplicated in the arthropod radiation. Diptera acquired and maintained functionally divergent duplicate AST-AR genes.Foundation for Science and Technology, Portugal (FCT) [PTDC/BIA-BCM/114395/2009]; European Regional Development Fund (ERDF) COMPETE - Operational Competitiveness Programme; Portuguese funds through FCT Foundation for Science and Technology [PEst-C/MAR/LA0015/2013, UID/Multi/04326/2013, PEst-OE/SAU/LA0018/2013]; FCT [SFRH/BPD/89811/2012, SFRH/BPD/80447/2011, SFRH/BPD/66742/2009]; auxiliary research contract FCT Pluriannual funds [PEst-C/MAR/LA0015/2013, UID/Multi/04326/2013]info:eu-repo/semantics/publishedVersio

Final steps in juvenile hormone biosynthesis in the desert locust, Schistocerca gregaria

Two genes coding for enzymes previously reported to be involved in the final steps of juvenile hormone (JH) biosynthesis in different insect species, were characterised in the desert locust, Schistocerca gregaria. Juvenile hormone acid O-methyltransferase (JHAMT) was previously described to catalyse the conversion of farnesoic acid (FA) and JH acid to their methyl esters, methyl farnesoate (MF) and JH respectively. A second gene, CYP15A1 was reported to encode a cytochrome P450 enzyme responsible for the epoxidation of MF to JH. Additionally, a third gene, FAMeT (originally reported to encode a farnesoic acid methyltransferase) was included in this study. Using q-RT-PCR, all three genes (JHAMT, CYP15A1 and FAMeT) were found to be primarily expressed in the CA of the desert locust, the main biosynthetic tissue of JH. An RNA interference approach was used to verify the orthologous function of these genes in S. gregaria. Knockdown of the three genes in adult animals followed by the radiochemical assay (RCA) for JH biosynthesis and release showed that SgJHAMT and SgCYP15A1 are responsible for synthesis of MF and JH respectively. Our experiments did not show any involvement of SgFAMeT in JH biosynthesis in the desert locust. Effective and selective inhibitors of SgJHAMT and SgCYP15A1 would likely represent selective biorational locust control agents.status: publishe

An assessment of the measurement of performance in international business research

A sizeable body of international business (IB) research is devoted to building knowledge about the determinants of organizational performance. A key precursor to accurately diagnosing why some organizations succeed in the international marketplace while others struggle is operationalizing performance appropriately. Yet, to date, no systematic investigation has considered how well IB research measures performance. We examine the measurement of performance in 96 articles published in the Academy of Management Journal, Administrative Science Quarterly, Journal of Marketing, Journal of Marketing Research, Journal of International Business Studies, Management Science, Organization Science, and the Strategic Management Journal between 1995 and 2005. The findings reveal that most studies do not measure performance in a manner that captures the multifaceted nature of the construct. We describe the implications of these results, and offer suggestions for improving future practice. Journal of International Business Studies (2008) 39, 1064–1080. doi:10.1057/palgrave.jibs.8400398

Innovativeness in family firms: Effects of positive leadership styles

WOS: 000444687500012Family business is an unique kind of business, that can be depicted by an ownership structure mostly dominated by members of a particular family, shared familial norms and values and a shared way of thinking accumulated over a long period of time. This socioemotional wealth of the family owning the family business and overlapping family and business goals make them more harmonious, ambitious, hard working and more engaged regarding both their familial and business goals. In family a firm, central decision making that is accumulated on the hands of founder owners and their desire for further growth result in an inclination to respond quickly to opportunities that have the probability to provide economic gains which will be useful for both the owner family and the business itself. Moreover, sustainability and long run performance in these kind of companies are significant both business goals and family honor. And in this paper it is claimed that like other firms, family businesses, also prefer to benefit from innovation for economic growth due to the fact that innovation is an activity that is fast in financial return. That is to say, engaging in innovation process is both difficult and time consuming, but once a company accomplished to innovate a certain product or service, financial returns of this accomplishment are highly satisfying and rapid. And in this process, as in the case with other kind of businesses, proper style of leadership is an important factor in motivating employers to engage in innovation processes, and unique characteristics of family businesses and antecedents of an innovative work atmosphere effects this proper leadership style