Hydroxyurea-mediated neuroblast ablation establishes birth dates of secondary lineages and addresses neuronal interactions in the developing Drosophila brain

Developmental Biology
Jennifer Lovick, Volker Hartenstein

Abstract

The Drosophila brain is comprised of neurons formed by approximately 100 lineages, each of which is derived from a stereotyped, asymmetrically dividing neuroblast. Lineages serve as structural and developmental units of Drosophila brain anatomy and reconstruction of lineage projection patterns represents a suitable map of Drosophila brain circuitry at the level of neuron populations ("macro-circuitry"). Two phases of neuroblast proliferation, the first in the embryo and the second during the larval phase (following a period of mitotic quiescence), produce primary and secondary lineages, respectively. Using temporally controlled pulses of hydroxyurea (HU) to ablate neuroblasts and their corresponding secondary lineages during the larval phase, we analyzed the effect on development of primary and secondary lineages in the late larval and adult brain. Our findings indicate that timing of neuroblast re-activation is highly stereotyped, allowing us to establish "birth dates" for all secondary lineages. Furthermore, our results demonstrate that, whereas the trajectory and projection pattern of primary and secondary lineages is established in a largely independent manner, the final branching pattern of secondary neurons is dependent u...Continue Reading

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Citations

Jun 29, 2016·The Journal of Comparative Neurology·Volker HartensteinMing Guo
Jul 5, 2017·The Journal of Comparative Neurology·Jennifer K LovickVolker Hartenstein
Jul 22, 2017·The Journal of Comparative Neurology·Volker HartensteinAmelia Younossi-Hartenstein
Mar 19, 2020·Biology Open·Sonu Shrestha BaralPatrick J DiMario
Jul 29, 2017·Development Genes and Evolution·George BoyanVolker Hartenstein
Dec 14, 2018·Frontiers in Neural Circuits·Jaison Jiro OmotoVolker Hartenstein

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