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Inactivation of the GATA Cofactor ZFPM1 Results in Abnormal

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Inactivation of the GATA Cofactor ZFPM1 Results in Abnormal Research Articles: Development/Plasticity/Repair Inactivation of the GATA cofactor ZFPM1 results in abnormal development of dorsal raphe serotonergic neuron subtypes and increased anxiety-like behaviour https://doi.org/10.1523/JNEUROSCI.2252-19.2020 Cite as: J. Neurosci 2020; 10.1523/JNEUROSCI.2252-19.2020 Received: 20 September 2019 Revised: 17 September 2020 Accepted: 25 September 2020 This Early Release article has been peer-reviewed and accepted, but has not been through the composition and copyediting processes. The final version may differ slightly in style or formatting and will contain links to any extended data. Alerts: Sign up at www.jneurosci.org/alerts to receive customized email alerts when the fully formatted version of this article is published. Copyright © 2020 the authors 1 Inactivation of the GATA cofactor ZFPM1 results in abnormal development of dorsal raphe 2 serotonergic neuron subtypes and increased anxiety-like behaviour 3 Laura Tikker1, Plinio Casarotto2, Parul Singh1, Caroline Biojone2, Petteri Piepponen3, Nuri Estartús1, 4 Anna Seelbach1, Ravindran Sridharan1, Liina Laukkanen2, Eero Castrén2, Juha Partanen1* 5 1Molecular and Integrative Biosciences Research Programme, P.O. Box 56, Viikinkaari 9, FIN-00014, 6 University of Helsinki, Helsinki, Finland 7 2Neuroscience Center, P.O.Box 63, Haartmaninkatu 8, FIN-00014, University of Helsinki, Helsinki, 8 Finland 9 3Division of Pharmacology and Pharmacotherapy, P.O. Box 56, Viikinkaari 5, FIN-00014, University 10 of Helsinki, Helsinki, Finland 11 *Corresponding author: Juha Partanen, [email protected] 12 Abbreviated title: ZFPM1 and serotonergic neuron development 13 Number of pages: 40 14 Number of figures: 7 15 Number of tables: 1 16 Number of words for abstract: 206 17 Number of words for introduction: 635 18 Number of words for discussion: 1258 19 Conflict of Interest: The authors declare no competing financial interests 20 Acknowledgments: 21 This work has been supported by Jane and Aatos Erkko Foundation, Sigrid Juselius Foundation and the 22 Academy of Finland. L.T. was funded by Integrative Life Science (ILS) doctoral programme in the 23 University of Helsinki, Orion Research Foundation sr and The Company of Biologists, Disease Models 1 24 & Mechanisms. Authors thank Outi Kostia for her excellent technical assistance. We thank Wolfgang 25 Wurst for the En1Cre, Claus Nerlov for the Zfpm1flox, and Stuart Orkin for the Zfpm2flox mice. 26 Keywords: Zfpm1, dorsal raphe, serotonergic neurons, DRVL, serotonin, anxiety, mouse, GATA 2 27 Abstract 28 Serotonergic neurons in the dorsal raphe (DR) nucleus are associated with several psychiatric disorders 29 including depression and anxiety disorders, which often have a neurodevelopmental component. 30 During embryonic development, GATA TFs GATA2 and GATA3 operate as serotonergic neuron fate 31 selectors and regulate the differentiation of serotonergic neuron subtypes of DR. Here, we analysed the 32 requirement of GATA cofactor ZFPM1 in the development of serotonergic neurons using Zfpm1 33 conditional mouse mutants. Our results demonstrated that, unlike the GATA factors, ZFPM1 is not 34 essential for the early differentiation of serotonergic precursors in the embryonic rhombomere 1 (r1). In 35 contrast, in perinatal and adult male and female Zfpm1 mutants, a lateral subpopulation of DR neurons 36 (DRVL) was lost, whereas the number of serotonergic neurons in a medial subpopulation (DRD) had 37 increased. Additionally, adult male and female Zfpm1 mutants had reduced serotonin concentration in 38 rostral brain areas and displayed increased anxiety-like behaviour. Interestingly, female Zfpm1 mutant 39 mice showed elevated contextual fear memory that was abolished with chronic fluoxetine treatment. 40 Altogether, these results demonstrate the importance of ZFPM1 for the development of DR 41 serotonergic neuron subtypes involved in mood regulation. It also suggests the neuronal fate selector 42 function of GATAs is modulated by their cofactors to refine the differentiation of neuronal subtypes. 43 SIGNIFICANCE STATEMENT 44 Predisposition to anxiety disorders has both a neurodevelopmental and a genetic basis. One of the 45 brainstem nuclei involved in the regulation of anxiety is the dorsal raphe, which contains different 46 subtypes of serotonergic neurons. We show that inactivation of a transcriptional cofactor ZFPM1 in 47 mice results in a developmental failure of laterally located dorsal raphe serotonergic neurons and 48 changes in serotonergic innervation of rostral brain regions. This leads to elevated anxiety-like 49 behaviour and contextual fear memory, alleviated by chronic fluoxetine treatment. Our work 3 50 contributes to understanding the neurodevelopmental mechanisms that may be disturbed in the anxiety 51 disorder. 4 52 Introduction 53 The DR modulates various aspects of physiology and behaviour through serotonin (5- 54 hydroxytryptamine, 5-HT). The DR is divided into several sub-regions with distinct projection targets 55 regulating anxiety, fear learning, reward and depression-like behaviours (Hioki et al., 2010; Hale and 56 Lowry, 2011; Waselus et al., 2011; Qi et al., 2014; Natarajan et al., 2017; Ren et al., 2018; Huang et 57 al., 2019). Serotonergic neurons in the dorsal (DRD) and ventral (DRV) regions of the medial DR 58 differentially project to the amygdala and cortical areas, and promote anxiety and active coping 59 responses, respectively (Muzerelle et al., 2016; Ren et al., 2018). In turn, serotonergic neurons in the 60 ventrolateral part of DR (DRVL, also called lateral wing of DR) innervate brain regions including the 61 thalamus, superior colliculus (SC), periaqueductal gray, and hypothalamus (Muzerelle et al., 2016). 62 The DRVL serotonergic and non-serotonergic neurons are activated by various types of stressors, and 63 have been suggested to regulate defensive behaviours (Johnson et al., 2008; Spiacci et al., 2012; Paul et 64 al., 2014). Additionally, serotonergic neurons in the DR and the adjacent median raphe (MR) send 65 abundant collateral projections to various rostral brain structures, including prefrontal cortex, septum 66 and hippocampus, that have also been implicated in anxiety and fear learning (Lacroix et al., 2000; 67 Waselus et al., 2011; Muzerelle et al., 2016; Parfitt et al., 2017). The serotonergic neuron subtypes 68 present unique molecular signatures (Okaty et al., 2015; Huang et al., 2019), but the mechanisms 69 guiding their development remain incompletely understood. 70 The precursors of all DR and many MR serotonergic neurons are located in the embryonic rV3 71 (rhombencephalic V3) region and are derived from the rp3 progenitors in the ventral r1 (Jensen et al., 72 2008; Haugas et al., 2016). After serotonergic progenitors become post-mitotic, a specific cascade of 73 transcription factors (TFs) is required to obtain their mature phenotype. One of the earliest genes 74 expressed is Gata2. In the absence of Gata2, all serotonergic neurons fail to differentiate and 5 75 progenitors give rise to ectopic Islet-1+, Slc17a6+ (Vglut2) and Cart+ (Cocaine- and amphetamine- 76 regulated transcript protein) cells instead (Craven et al., 2004; Haugas et al., 2016). Downstream of 77 GATA2, TFs LMX1B and PET1 are required for the terminal differentiation and maintenance of the 78 serotonergic identity as they upregulate the expression of genes needed to synthesise and transport 79 serotonin including Tph2 and Slc6a4 (Sert) (Ding et al., 2003; Zhao et al., 2006; Liu et al., 2010; Song 80 et al., 2011; Wyler et al., 2016). GATA3, another member of GATA family, is required for the 81 differentiation of Tph2+ and Slc6a4+ neurons (Haugas et al., 2016). Unlike Gata2, the expression of 82 Gata3 continues into adulthood, and is important for maintenance of serotonergic identity (Liu et al., 83 2010). 84 During the differentiation of several cell types, in particular in the hematopoietic system, GATA TFs 85 interact with their zinc-finger cofactor proteins ZFPM1 and ZFPM2 to repress or activate gene 86 expression (Tsang et al., 1997; Fox et al., 1999; Lu et al., 1999; Tevosian et al., 2000; Robert et al., 87 2002; Pal et al., 2004; Beuling et al., 2008; Miccio et al., 2010; Chlon et al., 2012). During neuronal 88 development, ZFPM2 was recently shown to be important for the full differentiation of corticothalamic 89 projection neurons in developing cortex and GABAergic neuron subtypes in r1 (Galazo et al., 2016) (F. 90 Morello, D. Borshagovski, M. Survila, L. Tikker et al., unpublished observations). The related cofactor, 91 ZFPM1, is also expressed in the DR serotonergic neuron precursors (Lahti et al., 2016), but the 92 function of ZFPM1 in their differentiation is not understood. 93 Here, we analysed the requirement of ZFPM1 for the development of r1-derived serotonergic and 94 GABAergic neurons. We show that ZFPM1 is important for normal development of r1 serotonergic 95 neuron subtypes in the DRVL and DRD. Consequently, Zfpm1 mutant mice display increased anxiety- 96 like behaviour and contextual fear memory, which can be alleviated by chronic fluoxetine treatment. 97 6 99 Material and Methods 100 Mice 101 Mouse lines En1Cre (The Jackson Laboratory, STOCK En1tm2(cre)Wrst/J, Cat#JAX:007916) (Kimmel et 102 al., 2000), Zfpm1flox (Katz et al., 2003) and Zfpm2flox (The Jackson Laboratory, Zfpm2tm2Sho/EiJ, 103 Cat#JAX:007266) (Manuylov et al., 2007) maintained on ICR background, were used to generate 104 conditional Zfpm1CKO (En1Cre/+;Zfpm1flox/flox) and compound Zfpm1
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