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Research Article
Bridging the gap between postembryonic cell lineages and identified embryonic neuroblasts in the ventral nerve cord of Drosophila melanogaster
Oliver Birkholz, Christof Rickert, Julia Nowak, Ivo C. Coban, Gerhard M. Technau
Biology Open 2015 4: 420-434; doi: 10.1242/bio.201411072
Oliver Birkholz
Institute of Genetics, University of Mainz, D-55099 Mainz, Germany
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Christof Rickert
Institute of Genetics, University of Mainz, D-55099 Mainz, Germany
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Julia Nowak
Institute of Genetics, University of Mainz, D-55099 Mainz, Germany
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Ivo C. Coban
Institute of Genetics, University of Mainz, D-55099 Mainz, Germany
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Gerhard M. Technau
Institute of Genetics, University of Mainz, D-55099 Mainz, Germany
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  • For correspondence: technau@uni-mainz.de
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  • Fig. 1.
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    Fig. 1. Generation and Processing of Clonal Data.

    (A–B′″) Lineage tracing using DiI labelling (Bossing et al., 1996b; Schmidt et al., 1997; A–A′″) as compared to applying Flybow 1.1B (Shimosako et al., 2014; B–B′″). (A) Schematic transverse sections showing right ventral half of a stage 6 and a stage 16 embryo; ventral is down, mesoderm in mint, mesectoderm and neuroectoderm are in beige. Classical labelling of single neuroectodermal progenitor cells (stage 6, capillary with red dye from right) allows targeted application of the dye (e.g. dorsal versus ventral cells or thoracic versus abdominal segments) and results in complete lineages at the end of embryogenesis (stage 16). (B) Schematic transverse sections showing right ventral half of a stage 10 and a stage 16 embryo (elav>Flybow 1.1B). Independent recombination events in (1) a NB, (2) a ganglion mother cell and (3) a postmitotic neuron, caused by a heatshock driven flipase are symbolised with arrowheads (stage 10). In stage 16 these events result in multicellular (1), two cell (2) or single cell clones (3), respectively, labelled randomly by mCherry-, mCitrine- or mTurquoise-expression. Maximum clone size and -density can be controlled by the timepoint and strength of the heatshock, but clone locations are arbitrary. Corresponding clonal types labelled by both methods can be unambiguously identified in vivo based on typical morphological characteristics: compare (A′–A′″) and (B′–B′″) respectively (dorsal views of early stage 17 VNCs). CBG, cell body glia; CG, channel glia; Ic, Ica, Icp, Ii, TB are specific interneurons (see Bossing et al., 1996b; Schmidt et al., 1997). (C–F) Demonstration of the Flybow 1.1B approach used to record, process and present the larval clone data. (C,D) Dorsal views on thoracic segments of a late L3 larva, representing the unprocessed stack that was used for Fig. 3B. (C′) resembles the default state (GFP-expression) in all neuronal cells without recombination event, while (C) extracts the three channels resulting from recombination. The yellow channel reveals only single cell clones, red shows a MNB- and a NB4-2 clone, cyan a NB4-1 clone. (C″) Nrt-antibody staining, visualising commissural fibres, that served as landmarks to identify secondary lineages (see text and Fig. 2 for details). (D) If a clone was chosen for presentation, the respective channel (here: the red one) was transformed into grey. Then every single layer was inspected and secondary cells and their projections were coloured red. Primary cells and all remaining projections clearly connected to the clone were coloured green (for discrimination between primary and secondary cells see text). (E–E″″) Stacks of several images from ventral (E) to dorsal (E″″) positions, documenting the procedure that results in (F), i.e. the complete stack and the same image as shown in Fig. 3B. White vertical bars indicate the midline.

  • Fig. 2.
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    Fig. 2. Pattern of Neurotactin-positive fibre bundles.

    Horizontal view of projections (several sections) through the ventral (A), intermediate (B) and dorsal (C) neuropil of the thorax and through the ventral neuropil of the abdomen (D) of a late L3 larva of the indicated genotype, stained against Nrt (magenta). GFP was recorded only weakly to not interfere with the Nrt-staining. The characteristic Nrt-positive bundles (indicated on the left) serve as landmarks to identify postembryonic cell lineages (see Truman et al., 2004) and corresponding segments. For abbreviations see text. Asterisks mark the leg neuropils, which are additionally highlighted by stippled lines. White vertical bars indicate the midline.

  • Fig. 3.
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    Fig. 3. Characteristics of MNB-, NB1-1- and NB1-2-lineage.

    (A,A′,C,E) Horizontal view (several sections) of the thoracic VNC of living embryos. (B,D,F,G,H) Horizontal view (maximum projection) of the thoracic (B,D,F,G) or anterior abdominal VNC (H) of fixed late third larval instars. In this figure and Figs 4–11, all embryonic images are marked by green, all larval ones by white capital letters. The primary sublineages are illustrated in green and the secondary sublineages in red, which does not reflect their original fluorophore expression (see Materials and Methods). Clone characteristics are highlighted by symbols (green: embryonic origin; red: larval origin; filled arrowhead: ipsilateral projections; hollow arrowhead: contralateral projections, filled arrow: motorprojections, hollow arrow: glial cells) and introduced in the text. Segments are indicated. The background fluorescence of other clones is in grey and allows orientation. White bars indicate the midline. Please see text for morphological details.

  • Fig. 4.
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    Fig. 4. Characteristics of NB2-1- and NB2-2-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 5.
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    Fig. 5. Characteristics of NB2-4-, NB2-5- and NB3-1-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 6.
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    Fig. 6. Characteristics of NB3-2-, NB3-3-, NB3-4-, NB3-5- and NB4-1-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 7.
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    Fig. 7. Characteristics of NB4-2-, NB4-3- and NB4-4-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 8.
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    Fig. 8. Characteristics of NB5-2- and NB5-3-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 9.
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    Fig. 9. Characteristics of NB5-4-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 10.
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    Fig. 10. Characteristics of NB6-1- and NB6-2-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 11.
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    Fig. 11. Characteristics of NB6-4-, NB7-1- and NB7-4-lineage.

    For details, see the text and the legend of Fig. 3.

  • Fig. 12.
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    Fig. 12. Segment-specific pattern and identities of embryonic neuroblasts, which are reactivated in the larva.

    Right hemineuromeres of the indicated segments are schematically shown. In each NB its embryonic name (upper row) according to Broadus et al. (Broadus et al., 1995) and Doe (Doe, 1992) and its postembryonic cell lineage (lower row) according to Brown and Truman (Brown and Truman, 2009), Kuert et al. (Kuert et al., 2014) and Truman et al. (Truman et al., 2004) are indicated, except for A2-A7, where the lower row indicates the name of the postembryonic progenitor according to Truman and Bate (Truman and Bate, 1988). NBs which are reactivated in the larva, are highlighted in green; those which are mitotically inactive are white; other colours mark NBs with segment-specific characteristics: (1) Lineage 18 was not identified in T1. (2) Lineage 11 was not identified in T3. (3) NB2-2 and NB5-3 only form a few secondary neurons in A1 and reveal PCD within their lineage. (4) NB6-2 is only reactivated in A2, but not posterior to it.

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Keywords

  • CNS development
  • Neuroblast
  • Cell lineage
  • Flybow
  • Segmental patterning
  • Drosophila

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Research Article
Bridging the gap between postembryonic cell lineages and identified embryonic neuroblasts in the ventral nerve cord of Drosophila melanogaster
Oliver Birkholz, Christof Rickert, Julia Nowak, Ivo C. Coban, Gerhard M. Technau
Biology Open 2015 4: 420-434; doi: 10.1242/bio.201411072
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Research Article
Bridging the gap between postembryonic cell lineages and identified embryonic neuroblasts in the ventral nerve cord of Drosophila melanogaster
Oliver Birkholz, Christof Rickert, Julia Nowak, Ivo C. Coban, Gerhard M. Technau
Biology Open 2015 4: 420-434; doi: 10.1242/bio.201411072

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