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. Author manuscript; available in PMC: 2020 Aug 18.
Published in final edited form as: Cell Rep. 2020 Jun 16;31(11):107778. doi: 10.1016/j.celrep.2020.107778

Combinatorial Developmental Controls on Striatonigral Circuits

Ayano Matsushima 1, Ann M Graybiel 1,2,*
PMCID: PMC7433760  NIHMSID: NIHMS1604812  PMID: 32553154

SUMMARY

Cortical pyramidal cells are generated locally, from pre-programmed progenitors, to form functionally distinct areas. By contrast, striatal projection neurons (SPNs) are generated remotely from a common source, undergo migration to form mosaics of striosomes and matrix, and become incorporated into functionally distinct sectors. Striatal circuits might thus have a unique logic of developmental organization, distinct from those of the neocortex. We explore this possibility in mice by mapping one set of SPNs, those in striosomes, with striatonigral projections to the dopamine-containing substantia nigra pars compacta (SNpc). Same-age SPNs exhibit topographic striatonigral projections, according to their resident sector. However, the different birth dates of resident SPNs within a given sector specify the destination of their axons within the SNpc. These findings highlight a logic intercalating birth date-dependent and birth date-independent factors in determining the trajectories of SPN axons and organizing specialized units of striatonigral circuitry that could influence behavioral expression and vulnerabilities to disease.

In Brief

Matsushima and Graybiel show that the birth dates of striatal projection neurons govern a center-surround organization in striosomes and the final destinations of their axons. These birth date-dependent controls seem to work in combination or in parallel with birth date-independent control of the final functional striatal sector in which they finally lie.

Graphical Abstract

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INTRODUCTION

The brain is composed of myriads of elementary circuits that work uniquely yet coordinately. The prototypical, unique design of each circuit can be pre-programmed in progenitor cells from which the eventual circuit constituents are born (O’Leary et al., 2007) or can be post-mitotically bestowed after the constituent cells are generated from a common progenitor (Brown et al., 2011). Because the prototypes of elementary circuits are often subject to pre- and post-natal refinement via activity-dependent plasticity (Ben-Ari, 2002; Garaschuk et al., 2000; Hensch, 2005; Katz and Shatz, 1996; Klingler et al., 2019; Saint-Amant and Drapeau, 2000), it has been difficult to dissociate the “nature versus nurture” factors that specify the axonal projection target of each cell within a given circuit. This problem has hampered the identification of etiologies underlying disorders as well as mechanisms to organize normal neural circuits. Here, we tackled this question for the striatonigral circuit, as one of the most conserved circuits through vertebrate evolution (Reiner et al., 2004; Smeets et al., 2000; Yamamoto and Vernier, 2011), with expectation to have unique dependencies on development as organizational and operational principles in health and disease.

The developmental organization of neocortical circuits has been extensively studied. Pyramidal cells are known to be generated locally in the ventricular and subventricular zones of developing cortex, from ~E11.5 to ~E17.5 in mice (Molyneaux et al., 2007). The sequentially generated cells migrate outward to the pial surface along radial glial fibers, so that later-born cells migrate past the existing early-born cells to populate more-superficial layers (Angevine and Sidman, 1961; Rakic, 1974). As a consequence, the birth dates of pyramidal cells are highly correlated with their laminar position within each functional area. However, even with this strong correlation, birth dates of cells do not necessarily specify the projection target of their axons from the initial outgrowth (Hatanaka et al., 2016). Studies have now identified distinct transcriptomic profiles, for example, for two pyramidal subtypes, intermingled in a single layer (Tasic et al., 2018), that have distinct projection targets and functional roles in behavior (Economo et al., 2018). Although it remains controversial whether the fates of anatomical projections are progressively restricted in a lineage that shares a given birth date (Azim et al., 2009) or genetically predetermined in the heterogeneous progenitor pools dividing at the same time (Klingler et al., 2019), the birth date of neocortical pyramidal neurons appears not to be a definitive factor in the specification of their axonal projections.

By contrast, striatal projection neurons (SPNs), which compose the majority of striatal neurons, are not required to undergo extensive migrations but, instead, originate in a common germinal epithelium in the lateral ganglionic eminence (LGE), adjoining the striatal anlage, where they build the mature striatum (Turrero Garcıá and Harwell, 2017). SPNs are generated during a prolonged period from ~E10.5 to ~E18.5 in mice. SPNs born in the early phase of this time window become incorporated into a three-dimensional labyrinth of interconnected modules, called striosomes, whereas the later-born counterparts settle in the surrounding matrix (Graybiel and Hickey, 1982; Mason et al., 2005; Newman et al., 2015; Song and Harlan, 1994; van der Kooy and Fishell, 1987). This mosaic organization of the striatum is manifested by the differential expression of many molecular markers (Crittenden and Graybiel, 2011; Graybiel, 1990; Graybiel and Ragsdale, 1978) and is committed to differential input and output connections with the neocortex (Eblen and Graybiel, 1995; Hunnicutt et al., 2016; Ragsdale and Graybiel, 1981; Smith et al., 2016); thalamus (Berendse and Groenewegen, 1990; Fujiyama et al., 2019; Ragsdale and Graybiel, 1991; Smith et al., 2014); brainstem structures, including the substantia nigra (Fujiyama et al., 2011; Graybiel, 1984; Lévesque and Parent, 2005); and, indirectly via the pallidum, the lateral habenula (Hong et al., 2019; Rajakumar et al., 1993; Wallace et al., 2017). Advanced sequencing methods are beginning to identify distinct molecular profiles of striosomes (Gokce et al., 2016; Saunders et al., 2018). Differential vulnerability of the striosome and matrix compartments has been demonstrated in post-mortem analysis in Huntington’s disease and other disorders (Goto et al., 2005; Hedreen and Folstein, 1995; Tippett et al., 2007). However, the birth dates, the molecular profiles, and the connectivity patterns of each compartment at maturity are arranged across three-dimensional gradients that follow the anterior-posterior, medial-lateral, and dorsal-ventral axes of the striatum, greatly obscuring which factors assign a specific striatal circuit to the SPNs, the cells of origin of the great output pathways of the basal ganglia.

To isolate the role of birth date in the organization of the striatal circuits, we applied fast-kinetics 4-hydroxytamoxifen (4-OHT) (Ye et al., 2016) to Dlx1::CreER embryos (Feil et al., 1997; Kelly et al., 2018; Taniguchi et al., 2011). The fast kinetics allowed us to differentially label SPN sublineages born a single day apart. With that aid, we uncovered a sub-compartmental geography of SPN settlement, from the center (early-born) to surround (late-born) of the striosomes, as though forming a center-surround rule. Furthermore, we demonstrated the decisive role of birth date in routing striatonigral SPN axons to a specialized dopamine-containing nigral structure, a function beyond or separate from the topographic restriction imposed by an unspecified, birth date-independent factor, manifested as the functional striatal sector within which the SPNs settle. This combinatorial control of circuits could be critical for constructing behavioral repertoires, hardwired in the basal ganglia, i.e., one of the oldest circuits in the evolution (Puelles et al., 2000; Reiner et al., 1998a, 2004). This combinatorial code could also influence vulnerabilities of sub-compartments to genetic and epigenomic insult.

RESULTS

Neurogenesis of SPNs starts shortly after the formation of LGE at E9.5 in mice (Sousa and Fishell, 2010) and continues until birth (Graybiel and Hickey, 1982; Song and Harlan, 1994; van der Kooy and Fishell, 1987). Among the many other genes involved in striatal neurogenesis, a homeobox gene Dlx1/2 provides one of the best genomic loci to capture temporally specific stages of SPN development. Namely, Dlx1 is upregulated in newborn SPNs just after the terminal mitosis (Kelly et al., 2018), followed by its downregulation during their differentiation into mature SPNs (Liu et al., 1997; Yun et al., 2002). The inducible Dlx1::CreER driver (Taniguchi et al., 2011) has proven to be a powerful tool to leave a permanent marker of DNA recombination in specific lineages of SPNs (Kelly et al., 2018), allowing post hoc assessment of the distribution of their cell bodies and neurite arborizations long after the initial induction. For a fine-grain dissection of SPNs depending on their birth dates, we applied the fast-acting formulation of 4-OHT, previously shown in adults to be cleared within hours in vivo (Ye et al., 2016). Cells marked by this method must have the history that CreER was expressed under the control of the Dlx1 promoter, i.e., around the time of SPN neurogenesis, and at the same time was bound by 4-OHT (Indra et al., 1999), i.e., around the time of its administration, so that CreER could be liberated from cytosolic traps to enter the nucleus (Figure 1A). When crossed with Ai14, nuclear Cre excises the stop sequence upstream of tdTomato, resulting in the permanent expression of the reporter in the cell. Here, we used the reporter expression at maturity as an indicator of birth dates of SPNs. For example, we name SPNs as E12.25-born SPNs when they were labeled by 4-OHT administered at E12.25.

Figure 1. Sharpened Birth-Dating with 4-OHT.

Figure 1.

(A) In Dlx1::CreER/Ai14 reporter mice, cells are permanently labeled by tdTomato only if 4-OHT has been administered when the Dlx1 promoter is active, i.e., the neurogenetic phase of striatal progenitors.

(B) 4-OHT was administered at successive developmental times, separated by a single day.

(C) Striatum of 4-OHT pulse-labeled mice was assessed at maturity. Coronal sections in upper panels were stained for tdTomato (red), CalDAG-GEFI (CDG1, green), and MOR1 (blue). Lower panels show individual channels in grayscale.

The terminology can be justified by the estimated time course of DNA recombination. The absolute requirement is the existence of the 4-OHT/CreER complex in the nucleus, under the control of the Dlx1 promoter, CreER expression level, intracellular 4-OHT concentration, nuclear translocation of 4-OHT/CreER complex, and exclusion of CreER from the nucleus after the detachment of 4-OHT. Cytosolic CreER is inert because of the lack of access to DNA. Previous literature allows us to estimate the upper and lower limits of the temporal precision. Guenthner et al. (2013) showed that 4-OHT administered 6 h before or after light stimulation to the visually deprived Fos::CreER mice could hardly, if ever, induce DNA recombination. This indicates that, even if cytosolic CreER remained after the termination of the Fos promoter activation, DNA recombination could not be induced by 4-OHT administered with a 6h delay or lead time. In addition, they used 4-OHT dissolved in oil, but not in an aqueous solution as we did, so their pharmacokinetics were likely slower than ours. Thus, we can estimate 6 h as the upper limit of temporal separation between 4-OHT administration and the trigger of the promoter activation upstream of CreER (i.e., neuronal activation for Fos and terminal mitosis for Dlx1). As the lower limit, Ye et al. (2016) showed that 4-OHT reached a maximum concentration in murine brains within 2 h after intraperitoneal injection. Our goal was to dissociate SPNs born 24 h apart (Figure 1B). Thus, none of these limits or the inherent ambiguity in the identification of the time of fertilization (less than a half day) affects our interpretation of the results.

Indeed, as we administered 4-OHT to Dlx1::CreER/Ai14 embryos at successive developmental times from E10.25 to E18.25, separated only by a single day (Figure 1B), each time resulted in a unique pattern of tdTomato in relation to the compartments (Figure 1C). With that fine resolution, we examined the developmental organization manifested as a patterned distribution of SPNs born in close succession during embryogenesis.

Center-Surround Rule Uncovered by Sharpened Birth-Dating with 4-OHT

Early (E11.25)-born cells settled near the centers of striosomes (second column in Figure 2A), followed by the later (E12~E13)-born cells filling the striosomal profiles up to, and even beyond, their borders. Then, yet later, E14.25-born cells dispersed into the surrounding matrix (from the third to fifth columns in Figure 2A). These observations suggested a “center-surround” rule: the earliest-born cells become located at the center of the striosomes, as though they seeded the cluster formation, whereas later-born cells settled in the outskirts of the striosomes and ultimately in the surrounding matrix.

Figure 2. Center-Surround Rule in the Anterior Striatum.

Figure 2.

(A) Circular striosomes in the anterior striatum at the same level shown in Figure 1. Time of 4-OHT administration is indicated above. Striatal sections were stained for tdTomato (red), CDG1 (green), and MOR1 (blue). Lower panels show tdTomato (middle) or MOR1 (bottom) in grayscale. White, dotted lines indicate manually annotated centers of striosomes.

(B) Birth date-ordered settlement of SPNs from the center to the peripheries of striosomes. Left: Y axis shows the probability of cells falling into the corresponding bin among the all counted cells for a given birth date indicated by distinct colors. Boxplots above show the distribution of median values for individual animals by the 25th, 50th, and 75th percentiles. Right: Mean and 95% confidence intervals of data ranks for each birth date cohort. No overlap of confidence intervals indicates the significant differences detected by post hoc pairwise comparison (p < 0.05), following Kruskal-Wallis test. Number of mice = 4. Number of slices analyzed per mouse = 3.44 ± 0.63. Number of cells sampled per mouse = 25.25 ± 3.95 (E11.25), 171.3 ± 142.7 (E12.25), 502.5 ± 175.7 (E13.25), and 423.8 ± 167.5 (E14.25); means ± SD.

(C) Subcallosal streaks in the anterior striatum. Lower panels show tdTomato expression in grayscale.

(D) Birth date-ordered settlement of SPNs around the subcallosal streak, shown in the same format as in (B). Number of mice = 4. Number of slices analyzed permouse = 3.44 ± 0.51. Number of cells sampled per mouse = 46.8 ± 13.9 (E11.25), 330.5 ± 223.74 (E12.25), 415.0 ± 44.0 (E13.25), and 357.3 ± 158.7 (E14.25).

(E) Representative E10.25-born cell at striosome-matrix border with dendrites arborizing in a striosome and with axon extending toward the matrix.

(F) Representative E10.25-born cell at striosome-matrix border with dendrites arborizing in the matrix and with axon extending toward a striosome.

See also Table S1.

We confirmed that pattern by taking geometric measurements and by performing statistical tests (Figure 2B). First, we registered the location of each tdTomato-positive cell in relation to the center and the border of the striosome identified by muopioid receptor 1 (MOR1) immunostaining. Cells at the center were assigned to 0, and those at the border were assigned to 1. Each cohort of SPNs born at a specific developmental time, from E11.25 to E14.25, exhibited a distinct probability distribution of settling into the ranges of relative location (i.e., shown as a histogram in Figure 2B, with a bin size of 0.25). The birth date-dependent shift of the distributions was statistically significant, both when each cell was regarded as a single datum (right panel in Figure 2B with 95% confidence intervals, Kruskal-Wallis test, p < 1 × 10−10, see Table S1 for post hoc pairwise comparisons) and when each mouse was regarded as a single datum (p < 0.05, see boxplot above the histogram in Figure 2B for variability across animals). This was also true when we excluded cells outside the striosomes (i.e., relative location > 1.0, Kruskal-Wallis test, p < 1 × 10−10 for cell), but not statistically for data per mouse (p = 0.0667). These data strongly support the existence of a birth date-dictated center-surround rule for the striosomal system, which is smoothly transitioned into the surrounding matrix.

A similar rule appeared to hold for the organization of the socalled subcallosal streak, the band of MOR1-positive striosomal cells along the lateral edge of the caudoputamen, except that its anisotropy, rather than the isotropic organization of “circular” striosomes, was the organizing geometry (Figures 2C and 2D). The birth date-dependent wave of settlement was statistically confirmed (Figure 2D; Kruskal-Wallis test, p < 1 × 10−10 for cells, p < 0.01 for mice), even when we excluded matrix cells from the analysis (Kruskal-Wallis test, p < 1 × 10−10 for cells, p < 0.01 for mice).

In this study, E10.25-born cells represent the minority of cells. Some of these cells had dendrites ramifying within striosomes but with their axon extending toward the matrix (Figures 2C and 2E), whereas others had dendrites extending into the matrix but axons extending toward striosomes (Figure 2F).

Despite Anteroposterior Gradients, the Center-Surround Rule Holds in the Posterior Striatum

SPNs in the posterior striatum are known to be born earlier than those in the anterior striatum (Kelly et al., 2018; Newman et al., 2015), so that the composition of the striosomes and the matrix should be shifted in terms of birth dates. Consistent with that expectation, from anterior to posterior, the SPNs spreading out from the confines of striosomes were born at E14.25 at 1.4 mm anterior to the bregma (fifth column in Figure 2A), but at E13.25 at 0.3 mm anterior to the bregma (forth column in Figure 3A). The birth date-dependent wave of settlement was statistically confirmed (Figure 3B; Kruskal-Wallis test, p < 1 × 10−10 for cells, p < 0.01 for mice), even when excluding matrix cells (Kruskal-Wallis test, p < 1 × 10−10 for cells, p < 0.01 for mice). Thus, although the center-surround rule was commonly observed, irrespective of the location along the anterior-posterior axis of the striatum, the exact birth dates of the component SPNs respected the gradient and shifted accordingly. Across the gradient, the three-dimensional architecture constructed by the same-age cells (e.g., E13.25) seems to form a cometlike structure with the leading anterior point entering into the center of the striosomes, followed by the trailing halo surrounding the striosomes, which might reflect their migration paths during development.

Figure 3. Despite Anteroposterior Gradients, Center-Surround Rule Holds in the Posterior Parts of Striatum.

Figure 3.

(A) Coronal sections at anterior 0.3 mm (top). The color code is the same as in Figure 1. Lower panels show circular striosomes. White, dotted lines in the middle panels indicate manually annotated centers of striosomes.

(B) Birth date-ordered settlement of SPNs around striosomes. Geometrical registration and figure format are the same as in Figure 2B. Number of mice = 4. Number of slices analyzed per mouse = 3.69 ± 0.48. Number of cells sampled per mouse = 54.0 ± 8.83 (E11.25), 222.5 ± 48.11 (E12.25), 487.5 ± 167.5 (E13.25), and 327.8 ± 41.08 (E14.25).

(C) Coronal sections for the caudal striatum with ventral MOR1-positive zone, in which E10.25-born cells form a cluster.

(D) Birth date-ordered settlement of SPNs in the ventral MOR1-positive zone. Number of mice = 4. Number of slices analyzed per mouse = 1.50 ± 0.51. Number of cells sampled per mouse = 19.0 ± 10.49 (E10.25), 129.5 ± 37.17 (E11.25), 116.0 ± 50.00 (E12.25), 82.00 ± 39.50 (E13.25), and 49.00 ± 10.80 (E14.25).

(E) Coronal sections of the tail of caudate nucleus where CDG1 expression is low.

(F) Birth date-ordered settlement of SPNs in the caudate tail. Number of mice = 4. Number of slices analyzed per mouse = 1.45 ± 0.51. Number of cells sampled per mouse = 3.00 ± 2.58 (E10.25), 91.50 ± 29.73 (E11.25), 140.3 ± 66.00 (E12.25), 170.25 ± 48.45 (E13.25), and 77.75 ± 9.50 (E14.25).

See also Table S1.

At the level of −0.6 mm posterior to the bregma, we again saw birth date-dependent settlement in the ventral MOR1-positive zone (Figures 3C and 3D). The settlement from the lateral edge of striatum to the border of the external segment of the globus pallidus was statistically confirmed (Figure 3D; Kruskal-Wallis test, p < 1 × 10−10 for cells, p < 0.01 for mice). As we assessed the laminar organization at the tail of caudate nucleus (Gangarossa et al., 2013; Miyamoto et al., 2018) (−1.1 mm posterior to the bregma; Figures 3E and 3F), we found that the birth dates could account for the lamination (Figure 3F; Kruskal-Wallis test, p < 1 × 10−10 for cells, p < 0.01 for mice).

The precision of 4-OHT birth-dating provided critical snapshots of the sequential settlement of SPNs. They point to the logic of striatal development initiated from the earliest seeding of the clustering, proceeding to the maturation of the striosomal system, followed by the dispersed formation of the matrix. The general center-surround rule is implemented from the anterior to the posterior parts of the striatum, as ordered settlements of SPNs born in succession within a time-window, which shift according to the spatial gradient but unequivocally beginning at one of the striosomal birth dates.

Birth Date-Dependent Gradients in Construction of the Striatonigral Circuit

In the neocortex, the birth dates of the pyramidal cells are highly correlated with the layers in which they will settle, but birth dates do not definitively predict targets of axonal projection (Economo et al., 2018; Hatanaka et al., 2016; Tasic et al., 2018). Analogously, our findings for the striatum illustrate that the birth dates of SPNs are highly correlated with the sub-compartment of settling, namely, from center to border and from peripheries of striosomes to the outlying matrix. These experiments, however, leave open the question of whether, and if so, how the axonal projections of the SPNs, which directly relates to their function, depend on their birthdates. To address this question, we focused on one of the most conserved circuits of the vertebrate brain, the striatonigral circuit, especially projections onto the striosome-dendron bouquets (intertwined striosomal afferent and the descending dopamine-containing dendrites from the ventral tier of the SNpc; see Figure 4A, right) and the posteriorly adjoining posterior cell cluster (PCC; tyrosine hydroxylase [TH]positive cells clustered deep in the medial substantia nigra pars reticulata [SNpr]; see Figure 4B, right).

Figure 4. Birth Date-Dependent Gradients in Construction of the Striatonigral Circuit.

Figure 4.

(A) Nigral sections of adult Dlx1::CreER/Ai14 mice administered with 4-OHT at embryonic time points indicated left. Left: coronal sections of anterior SNpc, in which the central striosome-dendron bouquet is formed, stained for tdTomato (red), tyrosine hydroxylase (TH, green), and Hoechst (blue). Right: magnification of striosome-dendron bouquet.

(B) Same as in (A) but in posterior SNpc with the posterior cell cluster, magnified in the right panels.

Most SPNs innervating the landmark bouquet (third column in Figure 4A) and the PCC (third column in Figure 4B) were born near the peak of the striosomal neurogenesis, E12.25. The axons of SPNs born 1 day earlier (i.e., E11.25) reached up to the ventral tier of the lateral SNpc but were largely precluded from the striosome-dendron bouquets and the PCC (second columns in Figures 4A and 4B, respectively). Those of SPNs born 1 day later (i.e., E13.25) innervated mainly the SNpr, with relatively few, presumably late-born striosomal SPN axons, intertwining themselves with the bouquets and the PCC (forth columns in Figures 4A and 4B, respectively). After that time window (e.g., E14.25), SPNs largely avoided the landmark structures (fifth columns in Figures 4A and 4B).

This detailed tracking of projection targets of striatonigral axons suggested, but did not prove, that the birth dates of SPNs determined (1) to which dopamine-containing or nondopamine-containing nigral cells they projected, and (2) to which nigral region, from the lateral to medial, they projected. These two features, however, still were confounded with one another in the Dlx1::CreER/Ai14 model because both the striosomal cells that prefer to project to dopamine-containing neurons (McGregor et al., 2019) and the matrix cells that mainly project to the non-dopaminergic SNpr neurons can express tdTomato because of their common birthdate (e.g., E13.25-born cells settled in matrix at −0.6 mm posterior to the bregma as shown in Figure 3C, but in striosomes, at 1.4 mm anterior to the bregma as shown in Figure 1C). Thus, as far as using Dlx1::CreER/Ai14, we could not determine whether tdTomato-positive striatonigral fibers were from the striosomal versus matrix cells or from the anterior versus posterior parts of the striatum. We, therefore, turned to a Dlx1::CreER/LSL-Flpo mouse line in combination with localized intrastriatal injection of a Flp-dependent adeno-associated virus (AAV), so that the fluorescent reporter was expressed exclusively in cells that went through the two steps: born at the time of 4-OHT administration to express Flp, and infected by Flp-dependent AAV injected locally. In this way, we could independently vary either the birth date of the SPNs, by the time of 4-OHT administration, or the striatal sectors into which they had settled at maturity, by the site of AAV injection.

Topographic Restriction of the Striatonigral Projection According to the Resident Sector in the Striatum

First, we mapped striatonigral inputs arising from SPNs in each of three different striatal sectors in which they had settled, holding birth dates constant. For that purpose, we injected a Flp-dependent reporter AAV that had minimal reporter expression in Flp-negative mice (Figure 7E) into the striatum of Dlx1:: CreER/LSL-Flpo mice pulse-labeled by 4-OHT at a single embryonic time point, E12.25, near the midpoint of striosomal neurogenesis. This strategy allowed us to use the central striosome-dendron bouquet as the landmark innervated by E12.25-born SPNs (Figure 4). Critically, this strategy confined the reporter expression to striatal SPNs born at the time of 4-OHT administration (i.e., E12.25); and, at the same time, distributed within the striatal sector in which the AAV was injected into a given mouse (Figure 5A).

Figure 7. Birth Date-Dependent Routing of Axons from a Single Sector of Striatum to the Central Striosome-Dendron Bouquet.

Figure 7.

(A–D) The central striosome-dendron bouquet for E11.25 (A), E12.25 (B), E13.25 (C), and E14.25 (D), shown in Figure 6C.

(E) Statistical verification of birth date-dependent routing of SPN axons into the central striosome-dendron bouquet, by the intensity ratio of birth date-dependent mCherry to infection marker mTagBFP2 fluorescence. Single data point corresponds to a single mouse. Red horizontal lines above each pair of boxes indicate significant differences (p < 0.005, two-tailed t test with Bonferroni correction). Number of mice = 3 (Dlx1-negative [Neg]), 7 (E11.25) (A), 5 (E12.25) (B), 6 (E13.25) (C), and 7 (E14.25) (D). Upper and lower edges of boxes indicate, respectively, 75th and 25th percentiles of the data. Whiskers indicate the maximum and minimum data values excluding outliers. Outliers were defined as values distant from the edge of boxes by more than 1.5 times of interquartile range.

Figure 5. Topographic Restriction of the Striatonigral Projection According to the Resident Sector in the Striatum.

Figure 5.

(A) Anterograde tracing of striatonigral axons from same-age SPNs settled in different functional sectors.

(B) Striatonigral projections of E12.25-born SPNs settled in the anterior pole of striatum. Left: striatal injection site stained for MOR1 (blue), CDG1 (red), and EGFP(green). Middle and right: anterior (middle) and posterior (right) SN stained for TH (red), GFP (green), and Hoechst (blue). Number of mice = 3.

(C and D) Same as in (B) but for E12.25-born SPNs settled in the anterior (C) and posterior (D) striatum. Number of mice = 3.

(E–I) Compartment-nonspecific infection marker was injected into the anterior pole (E), ventromedial/limbic sector of anterior striatum (F), ventrolateral sector of mid striatum (G), dorsal sector of posterior striatum (H), or tail of caudate nucleus (I). Upper panels: injection sites stained for mTagBFP2 (red) and TH (blue). Lower panels: nigral sections of the same mice stained for TH (green), mTagBFP2 (red), and Hoechst (blue). None of them route axons of resident SPNs to the central striosome-dendron bouquet. Number of mice = 2.6 ± 0.55.

The striatal region where the E12.25-born SPNs settled clearly controlled the topographic pattern of their striatonigral projection fields, as judged here by the landmark central bouquet. E12.25-born SPNs at the anterior pole of the striatum innervated the small bouquet near the anterior tip of the SNpc (Figure 5B). The E12.25-born SPNs in the anterodorsal striatum targeted the central, most conspicuous striosome-dendron bouquet (middle panel in Figure 5C). The E12.25-born cells in the posterior striatum innervated mainly the SNpr (Figure 5D). These findings demonstrate that the striatonigral projections of SPNs are topographically defined according to their eventual striatal sector of settling, even if they are born at approximately the same time during development.

To determine whether the source of a striatonigral projection to the landmark central bouquet was restricted to the anterodorsal sector so far identified, we next injected five different sectors of the striatum with an AAV-expressing mTagBFP2 in a compartment-nonspecific manner under the CAG promoter (Figures 5E5I). None of the labeled SPNs in the anterior pole (Figure 5E), ventromedial/limbic sector of anterior striatum (Figure 5F), ventrolateral sector of mid striatum (Figure 5G), dorsal sector of posterior striatum (Figure 5H), or tail of caudate nucleus (Figure 5I) sent their axons to the landmark central bouquet. Only axon terminals from those in the anterodorsal sector were detectable at the resolution of our microscopy. These results indicate that the SPNs settling in this anterodorsal striatal sector, including at least those born at E12.25, are the main, if not the sole, source of striatal inputs to the landmark bouquet. We note that the topographic factor shown here is birth date independent because we compared the projection of sameage, E12.25-born SPNs that settled in different striatal sectors.

Birth Date-Dependent Routing of Axons from a Single Sector of the Striatum to the Central Striosome-Dendron Bouquet

Striatonigral projections, especially those from striosomes in the dorsal striatum, empower the striatum to shut down the activity of dopamine-containing nigral neurons (Evans et al., 2017, 2019; McGregor et al., 2019). We, therefore, next asked whether a specific birth date, as a measure of a developmental program, authorizes the SPNs settled in a particular striatal region–here, focusing on the anterodorsal striatum–to have privileged potential to modulate dopamine-containing cells forming the striosome-dendron bouquet and PCC systems. To address this, we focused on the single sector and varied the birth dates of the SPNs involved in the circuits.

We injected Flp-dependent AAVs into the same, anterodorsal sector of Dlx1::CreER/LSL-Flpo mice pulse-labeled at one of four striosomal birth dates: E11.25, E12.25, E13.25, and E14.25 (Figures 6A and 6B). To have a valid comparison across animals, we co-injected an infection marker AAV expressing mTagBFP2 to verify whether the injection sites were comparable across the mice and, also, to be sure that the injections hit the sensorimotor sector housing SPNs projecting to the landmark central bouquet. As intended, we found mTagBFP2 was consistently expressed in the anterodorsal sector across the mice (upper row in Figure 6B), whereas the mCherry (fused to hM3D) expression, which was Flp dependent and thus birth date dependent, varied, depending on the time of 4-OHT administration corresponding to the patterns shown in Figures 1 and 2 (lower row in Figure 6B). In the nigral sections from the same mice (Figure 6C), birth date-nonspecific, mTagBFP2-positive fibers labeled the landmark central bouquet as well as the SNpr proper, demonstrating that we did succeed in injecting the anterodorsal sector in every group of mice, directing striatonigral axon terminals of resident SPNs around the bouquet and adjoining SNpr (Figure 5).

Figure 6. Birth Date-Dependent Projection of SPNs Settled in the Same Functional Sector.

Figure 6.

(A) Anterograde tracing of striatonigral axons of different-age SPNs settled in the same anterodorsal sector.

(B) Infection marker (mTagBFP2) was expressed in the anterodorsal sector consistently across mice. Top: striatal injection sites stained for MOR1 (blue), CDG1 (green), mCherry (red), and mTagBFP2 (gray). Bottom: enlarged images including striosomes.

(C) Coronal nigral sections stained for mTagBFP2 (blue in the first row and in grayscale in the second row), birth date-dependent mCherry (red in the first row and in grayscale in the third row), and TH (green in the first row, and in grayscale in the bottom row) at the level of the central striosome-dendron bouquet.

We next asked, as a test case for selectivity of striatonigral targeting, whether the particular birth dates of the SPNs coexisting in the same sensorimotor sector further confine the SPN axonal projections exactly to the landmark striosome-dendron bouquet (Figure 7). We found this to be the case. The axons of E11.25-born SPNs, labeled with mCherry, were hardly detectable in the control mTagBFP2-positive fiber bundles intertwined within the central bouquet (Figure 7A). Statistically, the projection strength, quantified by the intensity ratio of mCherry/mTagBFP2 in the central bouquet, was not significantly different from that in the Dlx1::CreER-negative control mice (Figure 7E). In sharp contrast, the mCherry-positive axons from E12.25-(Figure 7B) and E13.25-born (Figure 7C) SPNs were clearly colocalized with the mTagBFP2-expressing fiber bundles within TH-positive dendrons, forming synaptic varicosities. The mCherry/mTagBFP2 ratio at the central bouquet was significantly higher than the negative control (Figure 7E). Finally, the axons from E14.25-born SPNs had receded from the central bouquet (Figure 7D) and shifted ventrally toward the other mass of mTagBFP2 fibers observed in the ventral SNpr (Figure 6C). The strength of the E14.25 projection to the landmark bouquet was not significantly different from that of the negative control or from those of the E11.25, E12.25, and E13.25 samples (Figure 7E).

Taken together, these findings demonstrate that SPNs within the anterodorsal sector of the striatum born between E12.25 to E13.25, but not SPNs born at E11.25 or at E14.25, participated in building the specialized striatonigral circuit forming the striosome-dendron bouquets (Crittenden et al., 2016; Jimenez-Castellanos and Graybiel, 1989; Lévesque and Parent, 2005).

DISCUSSION

Our findings demonstrate that the striatonigral pathway arising from striosomal SPNs is restricted according to the precise times of births, and yet, that restriction is downstream of, or separately formulated from, the topographic organization of this pathway imposed by the functional sector within which the SPNs lie. This combinatorial set of birth date-dependent and -independent controls confers degrees of freedom in the striatal regulation over the activity of dopamine-containing neurons in the SNpc, known, in turn, to influence aspects of movement, motivation, and mood. Viewed in that light, our findings raise the possibility that this combinatorial control could be critical in searching for the mechanisms underlying vulnerabilities of striatonigral systems to systemic insults and for targeted therapeutics against neuronal disorders. For example, in both Huntington’s disease and Parkinson’s disease, there are clear topographic gradients of cellular and afferent fiber loss. In addition, there is differential vulnerability of striosomes along spatial axes of the striatum (Goto et al., 2005; Kuo and Liu, 2017; Tippett et al., 2007). These vulnerable cells can be precisely separated and genetically targeted for therapeutics because recent, single-nucleus RNA sequencing (RNA-seq) data indicate that the striosomal system is not only recognizable but also is composed of heterogeneous subpopulations (Gokce et al., 2016; Saunders et al., 2018). Given the strong influence that nigro-striato-nigral loops confers on behavior, from motor to motivational control, our findings also speak to the fundamental issue of the developmental and evolutionary restrictions on the behavioral repertoires characterizing a given species (Edinger, 1908).

Birth Date Specification and Its Relation to the Evolutionary Organization of Forebrain Circuits

In the evolution of amniotes over ~300 million years, the basal ganglia have maintained many features, from connectivity to molecular and developmental profiles (Grillner and Robertson, 2016; Puelles et al., 2000; Reiner et al., 1998a, 2004), in contrast to the radical modifications of the pallium and cerebral cortex (Briscoe and Ragsdale, 2018; Dugas-Ford and Ragsdale, 2015). Genetically, the homeobox gene Dlx1/2 defines the birthplace of striatal cells in birds and mammals. Anatomically, the SNpc, as a cluster of dopamine-containing neurons in the midbrain, is conserved across amniotes, located next to the γ-aminobutyric acid (GABAergic) SNpr, and bidirectionally connected with the striatum-containing part of the basal ganglia (Medina and Reiner, 1995; Reiner et al., 2004; Smeets et al., 2000). However, further distant from amniote, the existence of SNpc is still controversial. Species belonging to Agnatha (e.g., lamprey) and Actinopterygii (e.g., zebrafish), for example, appear to possess a homologous striatal structure but no midbrain dopamine-containing neurons (Yamamoto and Vernier, 2011). Apart from the difficulty in defining homologous circuits in distant species (Strausfeld and Hirth, 2013; Striedter, 2005), the developmental organization that we demonstrate here in Dlx1::CreER model mice might reflect canonical principles that, at least, the stem amniote adopted in the face of selection pressures.

Concentric Structure as an Organizing Geometry

Concentric structure, over and beyond the lamination, could be one of the schemas that biological systems tend to introduce for efficient arrangement of multiple lineages involving distinct circuits. In the murine striatum, we have found evidence for such a center-surround rule in organizing the settlement of SPNs. In birds, multiple functional centers are also arranged into core and shell regions that are composed by molecularly, hodologicaly, and functionally distinct lineages (Achiro et al., 2017; Johnson et al., 1995; Reiner et al., 2004), which might be ordered according to the times of birth. In contrast to the neocortex (He et al., 2015), however, we have no clue, as of now, about the mechanisms contributing to the ordered settlement of SPNs within striosomes. Possibilities are that these could be the product of birth date-dependent migration behavior (Hagimoto et al., 2017), chemoattractant and repellant interactions (Passante et al., 2008; Tai et al., 2013), anchoring of endfeet of radial glial progenitors to blood vessels (Tan et al., 2016; Vasudevan et al., 2008), the phase of a cell cycle (McConnell and Kaznowski, 1991), and/or innervation by dopamine-containing fibers during development (Hu et al., 2004; Newman et al., 2015; Specht et al., 1981; Voorn et al., 1988). Identification of these underlying mechanisms will be valuable in understanding not only the development of mammalian striatal systems but also whether the organization is the result of a parallel or convergent evolution yielding multiple specialized, yet separately orchestrated, circuits.

Origin of Functional Topography of Striatal Circuits

Our data provide clear evidence that the birth dates of SPNs control the multiplicity and layouts of striatonigral circuits. In parallel, we have demonstrated the existence of a birth date-independent control, which, at least in the adulthood, is manifested as the striatal sectors in which SPNs settled (Figure 5). The circuit topography might be initiated as genetically distinct subregions within the LGE (Tucker et al., 2008), refined by pruning postnatally (Friel et al., 2013; Hagihara et al., 2015; Hensch, 2005; Katz and Shatz, 1996), and maintained by the spatial gradient of genetic profiles (Märtin et al., 2019). Given that nigrostriatal projections are also organized topographically (Poulin et al., 2018), there may also exist a mechanism to align striatonigral and nigrostriatal projections to form closed and/or open loops, similar to corticostriatal circuits multiplexed for striosomes and sub-compartments in the matrix (matrisomes) (Alexander et al., 1986; Flaherty and Graybiel, 1993, 1994).

Heterogeneities within Striosomes at Maturity

We demonstrate that the SPNs within a given striatal compartment (i.e., striosome or matrix) can be developmentally distinct in terms of time of birth, and yet, on the other hand, that the SPNs settling in those different compartments can share common, compartment-dependent birth dates. These developmental profiles may account for aspects of the heterogeneity reported within the striosomal system at a sub-compartmental scale. The striosomal border regions (i.e., annular compartment) (Brimblecombe and Cragg, 2015; Faull et al., 1989) are vulnerable in patients with Huntington’s disease who have mood symptoms (Hedreen and Folstein, 1995; Tippett et al., 2007) and are prominent in the mature as well as the perinatal human brain (Graybiel and Ragsdale, 1980). They are enriched with local interneurons as well as late-born, rim-forming SPNs (Cowan et al., 1990; Graybiel et al., 1986; Kelly et al., 2018; Kubota and Kawaguchi, 1993; Rushlow et al., 1996). Among the few E10.25-born cells observed in this study, we found some striosomal SPNs extending its dendrites and axons across compartments (Bolam et al., 1988), in contrast to the processes of most later-born SPNs, which rarely cross the borders (Banghart et al., 2015; Bolam et al., 1988; Walker et al., 1993). Still to be determined is the relationship of birth dates and the expression patterns of D1and D2 receptors that correlate with striatonigral and striatopallidal SPNs (Gangarossa et al., 2013), MOR1 and d-opioid receptor expression (Banghart et al., 2015) and, more generally, the degree to which birth dates are decisive in the arrangement of heterogeneous cell-types defined molecularly and/or hodologically. The relationships among those attributes, as well as different metabolic demands of SPNs, may critically control their differential vulnerability to systemic insults in neurologic or neuropsychiatric disorders (Gagnon et al., 2018; Goto et al., 2005; Hayrapetyan et al., 2014; Kuo and Liu, 2017; Saka and Graybiel, 2003; Tippett et al., 2007).

Striosome-Dendron Bouquets as Possible Building Blocks to Influence Behavior

Striosome-dendron bouquets, by their anatomical character, stand in a position to exert powerful control over dopamine-containing neurons. Their unusual structure, with the intertwined bundles of ventrally extended, dopamine-containing dendrons and striosomal axons, might also have a long evolutional history. In birds, in which striatonigral and striatopallidal neurons are segregated into medial and lateral striatum, respectively (Karten and Dubbeldam, 1973; Reiner et al., 2004), striatonigral axon terminals were found to project dopaminergic dendrites extending into the adjacent SNpr (Reiner et al., 1998b). In primates, in correlation with the enlargement of the striatum and substantia nigra, there are larger numbers of descending dopamine-containing dendrites originating from multiple foci in the ventral tier of SNpc. It is not clear that these structures identified in other species correspond to the striosome-dendron bouquets discovered in mice. Our findings, however, suggest that at least in mice, the striosome-dendron bouquets are formed under the dual control of birth date (i.e., time) and the resident sector (i.e., space) of the SPNs. As the striatonigral system evolved to be larger and required longer embryonic periods to generate its constituent cells, it is possible that specialized circuits, including those crystallized as striosome-dendron bouquets, were added to the system one after another in proportion to the number of combinations of birth date and the destined striatal sectors of migration. The circuit elaboration, in turn, could have granted individual organisms survival-tested repertoires of behaviors, built upon the finely tuned tone of the dopamine for the appropriate movements (Albin et al., 1989; DeLong, 1990; Howe and Dombeck, 2016; Klaus et al., 2017), vigor (da Silva et al., 2018; Panigrahi et al., 2015; Salamone et al., 2018), alertness (Bromberg-Martin et al., 2010; Menegas et al., 2018), and motivation (Kawagoe et al., 1998; Richard et al., 2013; Schultz, 2006).

STAR★METHODS

RESOURCE AVAILABILITY

Lead Contact

Further information and requests for resources and reagents should be directed to and will be fulfilled by the Lead Contact, Ann M. Graybiel (graybiel@mit.edu).

Materials Availability

This study did not generate new unique reagents.

Data and Code Availability

Original/source data for Figures 2, 3, and 7 in the paper is available [i.e., Mendeley Data, https://doi.org/10.17632/pst2tzmpc4.3].

EXPERIMENTAL MODEL AND SUBJECT DETAILS

Animals

We used Dlx1-CreER mice (Taniguchi et al., 2011, MGI Cat# 5298042, RRID:MGI:5298042) crossed with either Ai14 (Madisen et al., 2010; IMSR Cat# JAX:007908, RRID:IMSR_JAX:007908) or LSL-Flpo (He el al., 2015, IMSR Cat# JAX:028584, RRID:IMSR_ JAX:028584) mice for fate-mapping of SPNs (Kelly et al., 2018). All mouse colonies were maintained in accordance with husbandry protocols approved by the Committee on Animal Care at MIT. Mice were housed under a standard 12-hr light/dark cycle with free access to food and water. We used both male and female adult mice, at least 3 weeks old and no older than 4 months of age at perfusion. Typically, we injected viruses at 2 months of age. All experimental procedures were approved by the Committee on Animal Care at MIT and were performed in accordance with the U.S. National Research Council Guide for the Care and Use of Laboratory Animals.

Timed Mating

Dlx1-CreER(het);Ai14(homo) or Dlx1-CreER(het); LSL-Flpo(homo) male breeders in FVB background, in which problematic alleles (i.e., Disc1del, Pde6brd1, mt-Atp8m1) were corrected by crossing with B6J mice (IMSR Cat# JAX:000664, RRID:IMSR_JAX:000664), were single housed at least for 1 week before the initiation of timed mating. Female breeders either in the same FVB background (IMSR Cat# JAX:001800, RRID:IMSR_JAX:001800) or Swiss webster (Taconic Biosciences, IMSR Cat# TAC:sw, RRID:IMSR_TAC:sw) were put into the cage with a male mouse after 5 pm during the light cycle. Presence of plug is checked in the next morning before 10 am, and if it exists, the female breeder is separately single-housed and designated as E0.5.

METHOD DETAILS

4-OHT Administration

We used aqueous solution of 4-OHT. Fifty mg of 4-OHT (Sigma-Aldrich, Cat# H6278–50) was dissolved, with or without 25 mg of progesterone (Sigma-Aldrich, Cat# P3972–5G), in 1250 μl DMSO and stored at −20°C, at 50 μl aliquots (40 mg/ml). On the day of experiment, each aliquot without progesterone was diluted by 950 μl of 2% Tween 80/saline to administer at the dose of 4-OHT 20 mg/kg. To administer at the dose of 4-OHT 15 mg/kg with progesterone 7.5 mg/kg, 37.5 μl of aliquots were added to 962.5 μl of 2% Tween 80/saline. The aqueous solution was subcutaneously injected at the volume of 0.01 ml/g body weight, either at E10.25 (in the morning of 10th day after the plug), E11.25, E12.25, E13.25, E14.25, E15.25, E16.25, E17.25, or E18.25.

AAVs and Plasmids

AAV1; SynP-F14F15S-splitTVA-EGFP (3.0 E12 gc/ml) and AAVdj; CAG-mTagBFP2 (3.25 E12 gc/ml) are kind gifts from Dr. Ian R. Wickersham. F14F15S is a short version (as denoted by S), i.e., lacking 13-bp tandem repeat element and a following single base pair, of Flp-dependent ‘FLEX’ (Atasoy et al., 2008) construct which consists of pairs of orthogonal FRT sites, F14 and F15 (Chatterjee et al., 2018; Turan et al., 2011). The design and sequence of splitTVA-EGFP is the same as described previously (Kohara et al., 2014). Plasmid of SynP-F14F15S-hM3D-mCherry was generated in house by sub-cloning hM3D-mCherry (Krashes et al., 2011; RRID:Addgene_44361, kindly provided by Bryan Roth) into the SynP-F14F15S vector provided by Dr. Ian R. Wickersham. The plasmid was packaged into AAV1 by Vigene Biosciences (2.49 E13 gc/ml).

Stereotaxic Virus Injections

Viruses were injected stereotactically (Stoelting Co.), through pulled glass micropipettes (Model P-2000, Sutter Instrument Co.), by applying pulses of air (Pneumatic PicoPump, PV800, WPI) triggered by stimulator (SEN-3301, Nihon Kohden). Typically, viruses were injected with 25 ms-long pulses spaced by 500 ms, at the speed of 1 nl/pulse. Mice were anesthetized and maintained with isoflurane during surgery. All AAV vectors were stocked at −80°C until use and were injected into mice within less than two freeze-thaw cycles.

For the experiments shown in Figures 5B5D, we injected 210 nL of AAV1; SynP-F14F15S-splitTVA-EGFP either into the right anterior pole of the striatum (A/P 1.74 mm, M/L +1.35 mm, D/V −2.24 mm), anterior striatum (A/P 0.90 mm, M/L +1.90 mm, D/V −2.00 mm), or posterior striatum (A/P 0.06 mm, M/L +2.40 mm, D/V −2.81 mm). Then, mice were transcardially perfused after the survival time of 4 weeks. For the experiments shown in Figures 5E5H, we injected AAVdj; CAG-mTagBFP2 either into the anterior pole of the striatum (A/P 1.74 mm, M/L +1.10 mm, D/V −2.65 mm, 210 nl), ventromedial sector of anterior striatum (A/P 0.90 mm, M/ L +1.31 mm, D/V –3.27 mm, 350 nl), dorsal sector of posterior striatum (A/P 0.06 mm, M/L +2.40 mm, D/V −2.90 mm, 350 nl), or tail of caudate nucleus (A/P −1.29 mm, M/L +3.35 mm, D/V −2.80 mm, 350 nl). Then, mice were transcardially perfused after the survival time of 1 week. For the experiments shown in Figures 6 and 7, we mixed the following three reagents with ratio of 1:2:9.4 in volume: AAVdj; CAG-tagBFP2, AAV1; SynP-F14F15S-hM3D-mCherry, and phosphate-buffered saline (PBS). Then, 210 nL of the mixture was injected into anterior striatum (A/P 1.32, M/L +1.63 mm, D/V −2.12 mm). Then, mice were transcardially perfused after the survival time of 3 weeks.

Sample Preparation for Histological Analysis

Mice were deeply anesthetized and then transcardially perfused with PBS followed by 4% paraformaldehyde in a 0.16 M phosphate buffer (pH7.4). Brains were post-fixed in the same fixative for < 12 hr, replaced in a 30% sucrose solution with PBS, embedded in OCT compound (Tissue-Tech) and frozen in dry ice-cold isopentane. In order to avoid any damage to samples, we froze samples within 5 days from perfusion. Samples were stored at −80°C until use.

Frozen specimen was cut with a cryostat into 20- or 25-μm-thick sections, fixed for a given experiment. After washed in PBS, the sections were blocked with 1% BSA / 5% normal goat serum / 0.3% Triton X-100 / PBS for 1 hr at room temperature, when primary antibodies to be used did not include one raised in goat. Otherwise, we used 1% BSA / 5% donkey serum / 0.3% Triton X-100 / PBS for the blocking. Then, the sections were incubated with primary antibody diluted in the same blocking buffer at 4°C on a shaker for 2 overnights.

The antibodies that we used were rabbit polyclonal anti-CalDAG-GEF I (Crittenden et al., 2010: 1:4000), rat monoclonal anti-mCherry (1:1000, Thermo Fisher Scientific Cat# M11217, RRID:AB_2536611), goat polyclonal anti-MOR1 (1:500, Santa Cruz Biotechnology Cat# sc-7488, RRID:AB_2156522), rabbit polyclonal anti-TH (1:1000, Abcam Cat# ab112, RRID:AB_297840), chicken polyclonal anti-mCherry (1:2000, Abcam Cat# ab205402, RRID:AB_2722769), mouse monoclonal anti-mu-crystallin (1:500, Santa Cruz Biotechnology Cat# sc-376687, RRID:AB_11150103), chicken polyclonal anti-GFP (1:2000, Abcam Cat# ab13970, RRID:AB_300798), mouse monoclonal anti-TH (1:4000, ImmunoStar Cat# 22941, RRID:AB_572268), sheep polyclonal anti-TH (1:1000, Abcam Cat# ab113, RRID:AB_297905), and rabbit polyclonal anti-tRFP (1:4000, Abcam Cat# ab13970, RRID:AB_300798).

After washing with PBS three times, tissue sections were incubated with the highly cross-absorbed secondary antibody that was conjugated to Alexa Fluor 488, DyLight 550, Alexa Fluor 546, Alexa Fluor 555 or Alexa Fluor 647 and was raised in goat or donkey, the same species to the blocking buffer, at the concentration of 4 μg/ml each. Finally, sections were stained with Hoechst 33342 (Thermo Fisher Scientific, Cat# H3570), further washed with PBS three times, then mounted on glass slides using Krystalon Mounting Medium (Sigma-Aldrich, Cat# 64969–71). All staining was performed on freshly prepared cryosections without any halts in the process.

QUANTIFICATION AND STATISTICAL ANALYSIS

Image Acquisition and Analysis

Confocal images were obtained using an LSM710 (Carl Zeiss). For images shown in Figures 1, 2, and 3, we took tiled images using Plan-Apochromat 20x/0.8, using ZEN (ZEN Digital Imaging for Light Microscopy, RRID:SCR_013672) software, at the resolution of 0.42 μm and 16 bit/pixel. Images were analyzed by Fiji (Fiji, RRID:SCR_002285). In order to count the cells with respect to compartmental border, subcallosal streak and striosomes were first identified and demarcated manually as CDG1-negative and MOR1-positive zones. Next, the center of the compartments was manually defined as point(s) equidistant from the nearest points on the boundary (see Figures 2A and 3A for representative examples). So, for a completely symmetrical circle, the center point will be a single point. For asymmetrical boundaries, the center points are a set of points, i.e., line, which constitutes an equidistant set of nearest two points on the boundary. Note that for these first two steps, tdTomato channel was not overlaid, so that the boundary or center identification was solely dependent on matrix (CDG1) and striosome (MOR1) markers. Then, tdTomato-positive somata were identified semi-automatically by in-house programmed macros utilizing ImageJ plugins as Kuwahara filter, repeated morphological operations, and particle analysis plugin, and these operations were supervised and verified by eye. Finally, the distances between the soma and the border (distanceborder) and between the soma and the center (distancecenter) were measured by Exact Euclidean Distance Transform (3D). Measured data were saved as spreadsheets and fed into MATLAB (MATLAB, RRID:SCR_001622) for further statistical analysis across samples. For each cell, we calculated the relative location in reference to the center and border of a striosome, and assigned 0 to cells at the center and 1 to those at the border. More specifically, when a cell was located within a striosome, the relative location assigned to the cell was distancecenter / (distancecenter + distanceborder). When a cell was located outside of a striosome, the relative location assigned to the cell was distancecenter / (distancecenter distanceborder). In this way, each cell’s distance to the center of the nearest striosome was indexed in a unit of diameter of the striosome. We excluded cells located too far away from striosomes (relative location > 2). We used built-in MATLAB function (‘kruskalwallis’) to test the significance of differences in distribution between cells born at different birthdates. Exact values of biological (i.e., mice) and technical (i.e., sections/sampled cells per mouse) replicates can be found in the section ‘Sample Sizes’ below.

For images shown in Figure 4, we took tiled images using Plan-Apochromat 20×/0.8, at the resolution of 0.21 μm and 16 bit/pixel. For striatal images shown in Figures 5B5D, we took tiled images using Plan-Apochromat 20×/0.8 or EC Plan-Neofluor 10×/0.30 M27. For nigral images shown in Figures 5B5D, we took tiled images using EC Plan-Neofluor 10×/0.30 M27 at the resolution of 0.83 and 16 bit/pixel. For striatal images shown in Figures 5E5H, we took tiled images using EC Plan-Neofluor 10×/0.30 M27 at the resolution of 0.83 μm and 16 bit/pixel. For nigral images shown in Figures 5E5H, we took tiled images using Plan-Apochromat 20×/0.8 at the resolution of 0.42 mm and 16 bit/pixel, or high resolution images using Plan-Apochromat 63×/1.40 Oil DIC M27 at the resolution of 0.09 μm and 16 bit/pixel. For striatal images shown in Figure 6B, we took tiled images using EC Plan-Neofluor 10×/0.30 M27 at the resolution of 0.83 μm and 16 bit/pixel (upper) or Plan-Apochromat 20×/0.8 at the resolution of 0.42 μm and 16 bit/pixel. For nigral images shown in Figure 6C, we took tiled images using Plan-Apochromat 20×/0.8, at the resolution of 0.21 μm and 16 bit/pixel. For images shown in Figure 7, we took z stacked images using Plan-Apochromat 63×/01.40 Oil DIC M27, 0.46 mm z-steps (twice of optical section), across ~5–7 μm wide depth at the resolution of 0.07 μm and 16 bit/pixel. For presentation in Figures 7A7D, we selected 4 sections with maximal intensity and made maximum intensity projection using ImageJ. For quantification in Figure 7E, the region corresponding to striosome-dendron bouquets was manually demarcated, and average intensity in the demarcated region was measured for the infection marker (i.e., mTagBFP2) and mCherry signals. As the background fluorescence, we also measured the average intensity in the region without mTagBFP2-positive fibers, again for each of the two channels, and subtracted from the average intensity measured for the central bouquet. Finally, we calculated the ratio of the two intensities, i.e., mCherry/mTagBFP2, as the index of projection strength. When multiple bouquets, at the middle of SNpc, were found in a single mouse, we averaged the ratio for the multiple bouquets to obtain a single point per mouse.

We set the optical section as 1 airy unit of the channel with longest wavelength (e.g., Alexa 647).

Exclusion of another Possibility to Explain Specific Innervation to the Central Bouquet

The abundance of projections to the central bouquet could not be accounted for by the abundance of the striosomal area occupied in the sectors. We quantified the percentage of MOR1-positive areas (presumed striosomes) within areas of the corresponding regions analyzed. We found the following percentages (mean ± std, biological replicate = 7): anterodorsal sector, 32.9 ± 6.2%; anterior pole, 46.2 ± 8.3%; ventromedial sector, 31.2 ± 5.0%; and ventrolateral sector, 17.3 ± 5.4%. For example, the anterodorsal sector had a smaller striosomal area than the anterior pole (two-tailed t test with Bonferroni correction, p < 0.0083), but evidently had a greater projection to the central bouquet. And although the anterodorsal sector had a comparable total striosomal area as the ventromedial sector, the ventromedial sector had only small, if any, projections to the central bouquet.

Sample Sizes and Statistical Test Used

Exact values of biological (i.e., mice) and technical (i.e., sections/sampled cells per mouse) replicates are shown in figure legends as mean ± std. For Figures 2 and 3, Kruskal-Wallis test (using MATLAB function ‘kruskalwallis’) was used to detect significant differences in the distributions of relative locations across the groups of cells born at different time points, or those of median value per mice administered by 4-OHT at different time points. We chose a non-parametric test because we would like to address the meaningful order of data across the groups, and due to the unbalanced number of samples across groups (i.e., number of cells per group) or the relatively small number of samples (i.e., number of mice per group). Outputs of the Kruskal-Wallis test were fed into the post hoc pairwise comparison function (using MATLAB function ‘multcompare’), and the significance of pairwise comparison between the data ranks (p < 0.05) are shown as a lack of overlap of the 95% confidence intervals in the right panel.

For the data shown in Figures 5E5I, we prepared 2 mice, one injection site per mouse, for the anterograde tracings from dorsal sector of posterior striatum (Figure 5H), and tail of caudate nucleus (Figure 5I), taken into account of the redundancy of these two experiments targeting the far posterior to the anterodorsal sector.

For the data shown in Figure 7, we used two-tailed T test (‘TTEST’ in Microsoft Excel, with the variables tails = 2, type = 3) in the main text and figure, rather than non-parametric (e.g., Wilcoxon-Mann-Whitney) test, since 1) the data were normally distributed except for the E14.25-group (tested by MATLAB function ‘jbtest’, Dlx1-neg; p = 0.1985, E11.25; p = 0.5000, E12.25; p = 0.0926, E13.25; p = 0.0739, E14.25; p = 0.0085), and 2) we aimed to test the difference in the parametric value (i.e., projection strength). Previous work indicates that, for certain sets of data, non-parametric tests (e.g., Wilcoxon-Mann-Whitney test) can erroneously reject the null hypothesis with higher probability than the parametric t test (Fagerland, 2012; Zimmerman, 1998). We therefore have employed t test evaluations. Indeed, we found more significant difference using Wilcoxon-Mann-Whitney test (MATLAB function ‘ranksum’) for the following comparisons: p = 0.0025 for E11 versus E12, p = 0.0012 for E11 versus E13, p = 0.0023 for E11 versus E14, p = 0.0043 for E12 versus E13, and p = 0.0012 for E13 versus E14.

Supplementary Material

1
2

KEY RESOURCES TABLE

REAGENT or RESOURCE SOURCE IDENTIFIER
Antibodies

Rabbit polyclonal anti-CalDAG-GEF I Crittenden et al., 2010 N/A
Rat monoclonal anti-mCherry Thermo Fisher Scientific Cat# M11217, RRID:AB_2536611
Goat polyclonal anti-MOR1 Santa Cruz Biotechnology Cat# sc-7488, RRID:AB_2156522
Rabbit polyclonal anti-TH Abcam Cat# ab112, RRID:AB_297840
Chicken polyclonal anti-mCherry Abcam Cat# ab205402, RRID:AB_2722769
Mouse monoclonal anti-mu-crystallin Santa Cruz Biotechnology Cat# sc-376687, RRID:AB11150103
Chicken polyclonal anti-GFP Abcam Cat# ab13970, RRID:AB_300798
Mouse monoclonal anti-TH ImmunoStar Cat# 22941, RRID:AB_572268
Sheep polyclonal anti-TH Abcam Cat# ab113, RRID:AB_297905
Rabbit polyclonal anti-tRFP Abcam Cat# ab13970, RRID:AB_300798
Donkey anti rabbit Alexa Fluor 488 Thermo Fisher Scientific Cat# A-21206, RRID:AB_2535792
Donkey anti rat DyLight 550 Thermo Fisher Scientific Cat# SA5–10027, RRID:AB_2556607
Donkey anti goat Alexa Fluor 647 Thermo Fisher Scientific Cat# A-21447, RRID:AB_2535864
Goat anti rabbit Alexa Fluor 488 Thermo Fisher Scientific Cat# A-11034, RRID:AB_2576217
Goat anti chicken Alexa Fluor 555 Abcam Cat# ab150174
Goat anti mouse Alexa Fluor 647 Thermo Fisher Scientific Cat# A-21236, RRID:AB_2535805
Donkey anti chicken Alexa Fluor 488 Abcam Abcam Cat# ab63507, RRID:AB_1139472
Donkey anti mouse Alexa Fluor 546 Thermo Fisher Scientific Cat# A10036, RRID:AB_2534012
Donkey anti sheep Alexa Fluor 488 Thermo Fisher Scientific Cat# A-11015, RRID:AB_2534082
Donkey anti rabbit Alexa Fluor 647 Thermo Fisher Scientific Cat# A-31573, RRID:AB_2536183

Bacterial and Virus Strains

AAV1; SynP-F14F15S-splitTVA-EGFP Laboratory of Dr. Ian Wickersham N/A
AAVdj; CAG-mTagBFP2 Laboratory of Dr. Ian Wickersham N/A
AAV1; SynP-F14F15S-hM3D-mCherry This paper N/A

Chemicals, Peptides, and Recombinant Proteins

4-OHT Sigma-Aldrich Cat# H6278–50
Progesterone Sigma-Aldrich Cat# P3972–5G

Deposited Data

Raw data This paper https://doi.org/10.17632/pst2tzmpc4.3

Experimental Models: Organisms/Strains

Mouse: Dlx1tm1(cre/ERT2)Zjh/Dlx1+ Taniguchi et al., 2011 MGI Cat# 5298042, RRID:MGI:5298042
Mouse: B6;129S6-Gt(ROSA) 26Sortm14(CAG-tdTomato)Hze/J Madisen et al., 2010 IMSR Cat# JAX:007908, RRID:IMSR_JAX:007908
Mouse: B6;129S4-Gt(ROSA) 26Sortm5(CAG-flpo)Zjh/J He et al., 2015 IMSR Cat# JAX:028584, RRID:IMSR_JAX:028584
Mouse: C57BL/6J The Jackson Laboratory IMSR Cat# JAX:000664, RRID:IMSR_JAX:000664
Mouse: FVB/NJ The Jackson Laboratory IMSR Cat# JAX:001800, RRID:IMSR_JAX:001800
Mouse: Tac:SW Taconic Biosciences IMSR Cat# TAC:sw, RRID:IMSR_TAC:sw

Oligonucleotides

Recombinant DNA

hM3D-mCherry Krashes et al., 2011 RRID:Addgene_44361
pAAV- SynP-F14F15S-hM3D-mCherry This paper N/A

Software and Algorithms

ZEN ZEN Digital Imaging for Light Microscopy RRID:SCR_013672
Fiji Fiji RRID:SCR_002285
MATLAB MATLAB RRID:SCR_001622
Microsoft Excel Microsoft RRID:SCR_016137

Highlights.

  • Fast kinetics of 4-OHT birth dating uncovers a network of striatonigral circuits

  • Striatonigral circuit elements are built serially during striosomal neurogenesis

  • Striatonigral circuits of same-age SPNs are ordered by striatal sector of settling

  • Axon terminal destinations of these SPNs are ordered by their differing birth dates

ACKNOWLEDGMENTS

We thank Dr. Josh Z. Huang (Cold Spring Harbor) for his original gift of the Dlx1-CreER line, now maintained in our laboratory, Dr. Ian Wickersham and Heather Anne Sullivan for generously providing viruses, as well as Graybiel laboratory members for their inputs and comments. This work was supported by the CHDI Foundation (A-5552), the Nancy Lurie Marks Family Foundation, NIH/NIMH (R01 MH060379), the Saks Kavanaugh Foundation, and a JSPS fellowship (20160378 to A.M.).

Footnotes

SUPPLEMENTAL INFORMATION

Supplemental Information can be found online at https://doi.org/10.1016/j.celrep.2020.107778.

DECLARATION OF INTERESTS

The authors declare no competing interests.

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Supplementary Materials

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2

Data Availability Statement

Original/source data for Figures 2, 3, and 7 in the paper is available [i.e., Mendeley Data, https://doi.org/10.17632/pst2tzmpc4.3].

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