Abstract
Neuropeptides are endogenous active substances that widely exist in multicellular biological nerve tissue and participate in the function of the nervous system, and most of them act on neuropeptide receptors. In insects, neuropeptides and their receptors play important roles in controlling a multitude of physiological processes. In this project, we sequenced the transcriptome from twelve tissues of the Asian citrus psyllid, Diaphorina citri Kuwayama. A total of 40 candidate neuropeptide genes and 42 neuropeptide receptor genes were identified. Among the neuropeptide receptor genes, 35 of them belong to the A-family (or rhodopsin-like), four of them belong to the B-family (or secretin-like), and three of them are leucine-rich repeat-containing G-protein-coupled receptors. The expression profile of the 82 genes across developmental stages was determined by qRT-PCR. Our study provides the first investigation on the genes of neuropeptides and their receptors in D. citri, which may play key roles in regulating the physiology and behaviors of D. citri.
Highlights
The central nervous system (CNS) and its neuropeptide messengers rank the highest in the entity level regulating endogenous biochemical control function [1]
Most of these receptors are subordinate to the G-protein-coupled receptors (GPCRs), and the GPCRs have a similar topographical structure with seven transmembrane domains which are highly conservative through evolution and constitute the largest superfamily of cell surface proteins [6]
In vivo studies showed that neuropeptides and their receptors appear to have key roles in the regulation of physiology and behavior in insects; injection of kinin caused a significant reduction in weight gain and an increased mortality in Heliothis virescens [7], injection of tachykinin (TK) resulted in diminished olfactory responses in electroantennograms of Periplaneta americana [8], reduced levels of the receptor of TK in Drosophila melanogaster olfactory receptor neurons (ORNs) showed increased attraction to two food-related odors [9]
Summary
The central nervous system (CNS) and its neuropeptide messengers rank the highest in the entity level regulating endogenous biochemical control function [1]. In vivo studies showed that neuropeptides and their receptors appear to have key roles in the regulation of physiology and behavior in insects; injection of kinin caused a significant reduction in weight gain and an increased mortality in Heliothis virescens [7], injection of tachykinin (TK) resulted in diminished olfactory responses in electroantennograms of Periplaneta americana [8], reduced levels of the receptor of TK in Drosophila melanogaster olfactory receptor neurons (ORNs) showed increased attraction to two food-related odors [9]. Resistance is not easy to develop, since a potential mutation in a neuropeptide precursor or receptor gene is typically detrimental [11]
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