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Corazonin Signaling Integrates Energy Homeostasis and Lunar Phase to Regulate Aspects of Growth SEE COMMENTARY and Sexual Maturation in Platynereis

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Corazonin Signaling Integrates Energy Homeostasis and Lunar Phase to Regulate Aspects of Growth SEE COMMENTARY and Sexual Maturation in Platynereis Corazonin signaling integrates energy homeostasis and lunar phase to regulate aspects of growth SEE COMMENTARY and sexual maturation in Platynereis Gabriele Andreattaa,1, Caroline Broyarta,2, Charline Borghgraefb, Karim Vadiwalaa, Vitaly Kozina,3, Alessandra Poloa,4, Andrea Bileckc, Isabel Beetsb, Liliane Schoofsb, Christopher Gernerc, and Florian Raiblea,1 aMax Perutz Labs, University of Vienna, A-1030 Vienna, Austria; bAnimal Physiology and Neurobiology, Department of Biology, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; and cDepartment of Analytical Chemistry, University of Vienna, A-1090 Vienna, Austria Edited by Lynn M. Riddiford, University of Washington, Friday Harbor, WA, and approved November 8, 2019 (received for review June 25, 2019) The molecular mechanisms by which animals integrate external and GnRH receptors. The GnRH receptors also cover the Adi- stimuli with internal energy balance to regulate major develop- pokinetic hormone (AKH) and AKH-CRZ–related peptide (ACP) mental and reproductive events still remain enigmatic. We in- receptors, diversifications of a single ancestral GnRH receptor vestigated this aspect in the marine bristleworm, Platynereis likely restricted to arthropods (13). dumerilii, a species where sexual maturation is tightly regulated In vertebrates, an increase in the activity of GnRH neurons in by both metabolic state and lunar cycle. Our specific focus was on the hypothalamus is the key event for the precise timing of sexual ligands and receptors of the gonadotropin-releasing hormone maturation (14). This occurs via enhanced release of 2 glycopro- (GnRH) superfamily. Members of this superfamily are key in trig- tein hormones, luteinizing hormone (LH) and follicle-stimulating gering sexual maturation in vertebrates but also regulate repro- hormone (FSH), from the anterior pituitary (15), promoting ste- ductive processes and energy homeostasis in invertebrates. Here roidogenesis and the maturation of gametes (16). Moreover, we show that 3 of the 4 gnrh-like (gnrhl) preprohormone genes the pulsatile secretion of GnRH is crucial for the timing of the are expressed in specific and distinct neuronal clusters in the Pla- monthly reproductive cycle in women (17, 18). The GnRH system tynereis brain. Moreover, ligand–receptor interaction analyses re- has repeatedly been suggested to play a role in the reproductive veal a single Platynereis corazonin receptor (CrzR) to be activated DEVELOPMENTAL BIOLOGY by CRZ1/GnRHL1, CRZ2/GnRHL2, and GnRHL3 (previously classified Significance as AKH1), whereas 2 AKH-type hormone receptors (GnRHR1/ AKHR1 and GnRHR2/AKHR2) respond only to a single ligand Gonadotropin Releasing Hormone (GnRH) acts as a key reg- (GnRH2/GnRHL4). Crz1/gnrhl1 exhibits a particularly strong up- ulator of sexual maturation in vertebrates, and is required regulation in sexually mature animals, after feeding, and in spe- for the integration of environmental stimuli to orchestrate cific lunar phases. Homozygous crz1/gnrhl1 knockout animals ex- breeding cycles. Whether this integrative function is conserved hibit a significant delay in maturation, reduced growth, and across phyla remains unclear. We characterized GnRH-type attenuated regeneration. Through a combination of proteomics signaling systems in the marine worm Platynereis dumerilii, and gene expression analysis, we identify enzymes involved in in which both metabolic state and lunar cycle regulate re- carbohydrate metabolism as transcriptional targets of CRZ1/ production. We find gnrh-like (gnrhl) genes upregulated in sexu- GnRHL1 signaling. Our data suggest that Platynereis CRZ1/GnRHL1 ally mature animals, after feeding, and in specific lunar phases. coordinates glycoprotein turnover and energy homeostasis with Animals in which the corazonin1/gnrhl1 gene has been disabled growth and sexual maturation, integrating both metabolic and de- exhibit delays in growth, regeneration, and maturation. Molecular velopmental demands with the worm’s monthly cycle. analyses reveal glycoprotein turnover/energy homeostasis as targets of CRZ1/GnRHL1. These findings point at an ancestral role corazonin | GnRH | reproduction | regeneration | lunar periodicity of GnRH superfamily signaling in coordinating energy demands dictated by environmental and developmental cues. nimals regulate development and reproduction according to Aenvironmental cues such as season, temperature, moon phase, Author contributions: G.A. and F.R. designed research; G.A., C. Broyart, C. Borghgraef, and food availability (1–5). Despite some advances on the mo- K.V., V.K., A.P., and A.B. performed research; G.A., C. Broyart, C. Borghgraef, K.V., V.K., lecular mechanisms, the integration of multiple environmental A.P., A.B., I.B., L.S., C.G., and F.R. analyzed data; and G.A. and F.R. wrote the paper. stimuli for the regulation of reproduction and growth is still poorly The authors declare no competing interest. understood. The marine bristleworm Platynereis dumerilii is well This article is a PNAS Direct Submission. suited to tackle the endocrine basis of this integration. Worms This open access article is distributed under Creative Commons Attribution License 4.0 exhibit a complex life cycle where food availability, circalunar cy- (CC BY). cle, and season regulate development and sexual maturation (6–8). Data deposition: The sequences reported in this paper have been deposited in the GenBank repository, https://www.ncbi.nlm.nih.gov/genbank/ (accession nos. MN537870– Moreover, this species is molecularly accessible, and various ge- MN537874 and MN545476–MN545481). netic toolkits allow functional studies (9–11). See Commentary on page 805. Several lines of evidence suggest that Gonadotropin-releasing 1To whom correspondence may be addressed. Email: gabriele.andreatta@univie.ac.at or hormone (GnRH)-like signaling has relevant functions in the florian.raible@univie.ac.at. interplay between reproduction and development, integrating 2Present address: The Plant Signaling Mechanisms Laboratory, Department of Plant Mo- both intrinsic and extrinsic factors in this balance. All bilaterians lecular Biology, University of Lausanne, 1015 Lausanne, Switzerland. possess GnRH-like preprohormones (12, 13). This GnRH-like 3Present address: Department of Embryology, St. Petersburg State University, St. Petersburg preprohormone superfamily is subdivided into different sub- 199034, Russia. families, based on the phylogenetic grouping of their receptors 4Present address: Reef Renewal Foundation Bonaire, Kralendijk, Bonaire, Caribbean and the historical names by which GnRH-like peptides were Netherlands. referred to in different animal phyla. Supported by evolutionary This article contains supporting information online at https://www.pnas.org/lookup/suppl/ arguments, a recently suggested unified nomenclature (13) dis- doi:10.1073/pnas.1910262116/-/DCSupplemental. tinguishes 2 main receptor categories: Corazonin receptors (CrzR) First published December 16, 2019. www.pnas.org/cgi/doi/10.1073/pnas.1910262116 PNAS | January 14, 2020 | vol. 117 | no. 2 | 1097–1106 Downloaded by guest on September 30, 2021 timing of semilunar/lunar synchronized spawners (19–23). How- lecular phylogenetic analyses based on their amino acid sequence ever, this evidence is at present correlational. It could be linked to alone do not provide sufficient support for a decisive split into the spawning event per se and thus only indirectly to lunar/semi- CRZ and AKH/GnRH subgroups (SI Appendix, Figs. S1 and lunar rhythmicity. Additional evidence for the involvement of the S2A). To faithfully reflect this lack of unambiguous phylogenetic GnRH system in the timing of reproductive events comes pri- classification, we here adopt a dual nomenclature for these li- marily from studies in birds and mammals. During seasonal gands, combining a general GnRH-like name (GnRHL1-4) with changes, nonphotosensitive (photorefractory or reproductively an additional name reflecting reliable deorphanization-based as- inactive) birds show a reduction in both the number and the size of signment to one of the established receptor orthology groups (13). GnRH immunoreactive cells (24), a condition reversed in breed- This nomenclature reassigns the ligand previously called AKH1 ing photosensitive animals (25). In mammals, the pulsatile secre- (53) to GnRHL3 (see below) and renames AKH2 (53) to Platy- tion of GnRH is reduced in the nonbreeding (anestrous) season, nereis GnRH2/GnRHL4 (please see SI Appendix,TableS1,fora and the reactivation of the hypothalamic–pituitary–gonadal axis is synopsis of nomenclature and alternative proposals). In our se- dictated by a seasonal-dependent increase in kisspeptin expression quence analysis, we found no conservation at the level of the and a concomitant reduction in Gonadotropin-inhibitory hormone C-terminal portion of propeptides, which in vertebrates contains the (GnIH) production (26–28). GnRH-associated peptide (GAP) (55, 56) (SI Appendix,Fig.S1). Also in several invertebrate groups, preprohormones of the As a first assessment if the GnRH superfamily system could be GnRH superfamily are involved in the regulation of different involved in adult biology, we performed whole-mount RNA in aspects of reproduction. For instance, CRZ signaling coordi- situ hybridization with the respective riboprobes on head sam- nates aspects of copulation and fecundity in Drosophila (29, 30) ples of mature male and female individuals. These experiments and steroid synthesis in Octopus gonads (31). Interestingly, the allowed us
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