Neural Stem Cell Dynamics in Drosophila Development

During Drosophila development, neural stem cells known as neuroblasts follow a tightly regulated programme of proliferation, temporal patterning, quiescence, reactivation and termination to generate the full complement of neuronal and glial cell types. In the embryonic central nervous system, a sequential cascade of temporal transcription factors confers distinct identities on successive progeny, ensuring precise circuit assembly. Following embryogenesis, larval neuroblasts re-enter the cell cycle in response to nutrition-sensing glia that secrete insulin-like peptides, then expand lineages through asymmetric division and—in select cases—through intermediate progenitor amplification. Mid-larval transitions between early factors (Chinmo, Imp, Lin-28) and late factors (Syncrip, Broad, E93) are controlled by the steroid hormone ecdysone, which synchronises systemic signals with intrinsic lineage cues. As metamorphosis approaches, decommissioning of most central brain neuroblasts is triggered by ecdysone receptor-mediated shrinkage, nuclear accumulation of Prospero and cell cycle exit, while mushroom-body neuroblasts delay termination via persistent Imp expression. Ageing of larval neuroblasts is actively prevented by antagonism between pipsqueak family genes and Prospero, preserving proliferative capacity. Under pathological or experimental conditions, differentiated progeny can dedifferentiate into ectopic neuroblasts, but these cells often exhibit disrupted temporal progression and impaired diversity of neuronal and glial outputs. Together, these mechanisms coordinate growth, fate determination and timely cessation of neural stem cell activity to sculpt the mature Drosophila brain.

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Technical terms

Neuroblast: A neural stem cell in Drosophila that divides asymmetrically to self-renew and produce differentiating progeny.

Temporal transcription factor: A transcriptional regulator expressed in neuroblasts in a defined sequence, dictating the birth order and identity of daughter cells.

Quiescence: A reversible non-proliferative state entered by neuroblasts between embryonic and post-embryonic phases.

Dedifferentiation: The process by which mature, specialised cells revert to a stem cell-like state and regain proliferative capacity.

Ecdysone: A systemic steroid hormone that orchestrates molting and metamorphosis, and regulates neuroblast temporal transitions.

Decommissioning: The lineage-specific termination of neuroblast proliferation during metamorphosis, involving shrinkage, Prospero nuclear localisation and cell cycle exit.

Intermediate progenitor: A transient amplifying cell derived from a neuroblast that undergoes additional symmetric divisions before differentiating.

References

1. Dedifferentiation‐derived neural stem cells exhibit perturbed temporal progression. EMBO Reports (2023).
2. Pipsqueak family genes dan/danr antagonize nuclear Pros to prevent neural stem cell aging in Drosophila larval brains. Frontiers in Molecular Neuroscience (2023).
3. Steroid hormone induction of temporal gene expression in Drosophila brain neuroblasts generates neuronal and glial diversity. eLife (2017).
4. Nutrition-Responsive Glia Control Exit of Neural Stem Cells from Quiescence. Cell (2010).
5. Amplification of neural stem cell proliferation by intermediate progenitor cells in Drosophila brain development. Neural Development (2008).
6. Imp and Syp RNA-binding proteins govern decommissioning of Drosophila neural stem cells. Development (2017).