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Seminar – Sepand Rastegar

12 October 2022 / 11:00

Venue: Centre Broca

Sepand Rastegar
Karlsruhe Institute of Technology

Invited by Karine Massé


Control of adult neurogenesis and regeneration by the BMP-Id1 signalling pathway in the adult zebrafish telencephalon.


Neurons are the building blocks of all nervous systems. In mammals, neurons are generally not replaced when damaged or dead, which can lead to progressive degeneration and death of neuronal tissues, resulting in neurological disorders.
In contrast, teleost fish have the remarkable ability to generate new neurons and repair damage, even as adults. We are therefore using zebrafish as a model to understand when, where and how adult neurogenesis functions in these fish and how it differs from the situation in mammals.
During neurogenesis, multiple developmental decisions lead to the establishment of specific transcriptional expression programmes, and these programmes are controlled by the expression and/or selective activity of transcriptional regulators.
To understand the molecular mechanisms that control adult neurogenesis and regeneration, we performed a genome-wide screen to find transcriptional regulators expressed in the adult zebrafish brain and their response to injury. We identified several hundred transcriptional regulatory genes whose expression is altered by injury. Among these genes, the expression of id1 (DNA binding inhibitor 1) was upregulated specifically in the ventricular zone of injured brains.
In my talk, I will present our latest results concerning the function of id1 and its transcriptional regulation during adult constitutive and regenerative neurogenesis in the zebrafish telencephalon. I will show how radial glia neuron-cell communication via BMP/Id1 signalling is essential for the long-term maintenance of regenerative capacity in the adult zebrafish telencephalon.

10 recent publications

  • Baranasic D, Hörtenhuber M, Balwierz PJ, Zehnder T, Mukarram AK, Nepal C, Várnai C, Hadzhiev Y, Jimenez-Gonzalez A, Li N, Wragg J, D’Orazio FM, Relic D, Pachkov M, Díaz N, Hernández-Rodríguez B, Chen Z, Stoiber M, Dong M, Stevens I, Ross SE, Eagle A, Martin R, Obasaju O, Rastegar S, McGarvey AC, Kopp W, Chambers E, Wang D, Kim HR, Acemel RD, Naranjo S, Łapiński M, Chong V, Mathavan S, Peers B, Sauka-Spengler T, Vingron M, Carninci P, Ohler U, Lacadie SA, Burgess SM, Winata C, van Eeden F, Vaquerizas JM, Gómez-Skarmeta JL, Onichtchouk D, Brown BJ, Bogdanovic O, van Nimwegen E, Westerfield M, Wardle FC, Daub CO, Lenhard B, Müller F. Multiomic atlas with functional stratification and developmental dynamics of zebrafish cis-regulatory elements. Nat Genet. 2022 Jul;54(7):1037-1050. doi: 10.1038/s41588-022-01089-w.
  • Lübke L, Zhang G, Strähle U, Rastegar S. mdka Expression Is Associated with Quiescent Neural Stem Cells during Constitutive and Reactive Neurogenesis in the Adult Zebrafish Telencephalon. Brain Sci. 2022 Feb 18;12(2):284. doi: 10.3390/brainsci12020284.
  • Zhang G, Lübke L, Chen F, Beil T, Takamiya M, Diotel N, Strähle U, Rastegar S. Neuron-radial glial cell communication via BMP/Id1 signaling maintains the regenerative capacity of the adult zebrafish telencephalon. Cells. 2021 Oct 19;10(10):2794. doi: 10.3390/cells10102794.
  • Gourain V, Armant O, Lübke L, Diotel N, Rastegar S, Strähle U. Multi-dimensional transcriptome analysis reveals modulation of cholesterol metabolism as highly integrated response to brain injury. Front Neurosci. 2021 May 14;15:671249. doi: 10.3389/fnins.2021.671249. eCollection 2021.
  • Ghaddar, B., Lübke, L., Couret, D., Rastegar S#., Diotel, N. (2021) Cellular Mechanisms Participating in Brain Repair of Adult Zebrafish and Mammals after Injury. Cells. 2021 Feb 14;10(2):391. doi: 10.3390/cells10020391.
  • Diotel, N., Lübke, L., Strähle, U., Rastegar, S. (2020) Common and Distinct Features of Adult Neurogenesis and Regeneration in the Telencephalon of Zebrafish and Mammals. Frontiers in neuroscience. Front Neurosci. 2020 Sep 23;14:568930.doi: 10.3389/fnins.2020.568930. eCollection 2020.
  • Pax6 organizes the anterior eye segment by guiding two distinct neural crest waves.Takamiya M, Stegmaier J, Kobitski AY, Schott B, Weger BD, Margariti D, Cereceda Delgado AR, Gourain V, Scherr T, Yang L, Sorge S, Otte JC, Hartmann V, van Wezel J, Stotzka R, Reinhard T, Schlunck G, Dickmeis T, Rastegar S, Mikut R, Nienhaus GU, Strähle U. PLoS Genet. 2020 Jun 17;16(6):e1008774. doi: 10.1371/journal.pgen.1008774.
  • Zhang G, Ferg M, Lübke L, Takamiya M, Beil T, Gourain V, Diotel N, Strähle U, Rastegar S. Bone morphogenetic protein signaling regulates Id1-mediated neural stem cell quiescence in the adult zebrafish brain via a phylogenetically conserved enhancer module. Stem Cells. (2020) Apr 3. doi: 10.1002/stem.3182.
  • Rastegar, S., Parimisetty, A., Cassam-Sulliman, N., Narra Sai, S., Weber, S., Rastegar, M., Viranaicken, W., Couret, D., Planesse, C., Strähle, U., Meilhac, O., Lefebvre d’Hellencourt, C., Diotel, N. (2019) Expression of adiponectin receptors in the brain of adult zebrafish and mouse: Links with neurogenic niches and brain repair. The Journal of comparative neurology. 527(14):2317-2333.
  • Gerber V, Yang L, Takamiya M, Ribes V, Gourain V, Peravali R, Stegmaier J, Mikut R, Reischl M, Ferg M, Rastegar S#, Strähle U. The HMG box transcription factors Sox1a and b specify a new class of glycinergic interneurons in the spinal cord of zebrafish embryos. Development. 2019 Feb 20;146(4). pii: dev172510. doi: 10.1242/dev.172510.


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12 October 2022
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