Cited by 14Neurogenesis and neuroplasticity mechanismsDown syndrome and intellectual disability researchDevelopmental Biology and Gene Regulation

Biphasic cell cycle defect causes impaired neurogenesis in down syndrome

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Sharma, Vishi, Nehra, Sunita, Do, Long H., Ghosh, Anwesha, Deshpande, Aniruddha J., Singhal, Nishant·2022·Frontiers in Genetics

Abstract

Impaired neurogenesis in Down syndrome (DS) is characterized by reduced neurons, increased glial cells, and delayed cortical lamination. However, the underlying cause for impaired neurogenesis in DS is not clear. Using both human and mouse iPSCs, we demonstrate that DS impaired neurogenesis is due to biphasic cell cycle dysregulation during the generation of neural progenitors from iPSCs named the “neurogenic stage” of neurogenesis. Upon neural induction, DS cells showed reduced proliferation during the early phase followed by increased proliferation in the late phase of the neurogenic stage compared to control cells. While reduced proliferation in the early phase causes reduced neural progenitor pool, increased proliferation in the late phase leads to delayed post mitotic neuron generation in DS. RNAseq analysis of late-phase DS progenitor cells revealed upregulation of S phase-promoting regulators, Notch, Wnt, Interferon pathways, and REST, and downregulation of several genes of the BAF chromatin remodeling complex. NFIB and POU3F4, neurogenic genes activated by the interaction of PAX6 and the BAF complex, were downregulated in DS cells. ChIPseq analysis of late-phase neural progenitors revealed aberrant PAX6 binding with reduced promoter occupancy in DS cells. Together, these data indicate that impaired neurogenesis in DS is due to biphasic cell cycle dysregulation during the neurogenic stage of neurogenesis.

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Crossref · 10.3389/fgene.2022.1007519

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  • Cell cycle dynamics are altered in Down syndrome and are altered differentially at different developmental stages.

    “This suggested that cell cycle dynamics are altered in DS and that they are altered differentially at different developmental stages.”
  • BrdU pulse labelling of trisomy 21 induced pluripotent stem cell-derived progenitors revealed that the proportion of neural progenitor cells in S phase of the cell cycle can vary across different stages of their development in vitro.

    “Additional evidence, which shows that decreased proliferation of progenitors can lead to the generation of fewer neurons in DS, comes from BrdU pulse labelling of T21 iPSC-derived progenitors, which revealed that the proportion of NPCs in S phase of the cell cycle, the period of protein synthesis before mitosis or cell division, can vary across different stages of their development in vitro65.”

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Authors
Sharma, V., Nehra, S., Do, L. H., Ghosh, A., Deshpande, A. J., & Singhal, N.
Affiliations
  • National Centre for Cell Science (IN)
  • University of California San Diego (US)
  • Sanford Burnham Prebys Medical Discovery Institute (US)
Corresponding author
Singhal, Nishant
Venue
Frontiers in Genetics
Published
2022-10-12
Volume
13
Pages
1007519-1007519
ISSN
1664-8021 (ISSN-L)
OpenAlex
W4304786046
Cited by
14
References
106
Citations by year
2026: 7 · 2025: 2 · 2024: 3 · 2023: 2
FWCI
0.64
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Genetics (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Centre for Cell Science
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
Down syndrome, cell cycle dysregulation, neural progenitor proliferation, Pax6, BAF chromatin remodeling complex, rest, Notch signaling, Wnt signaling, interferon signaling, NFIB, POU3F4, cortical lamination

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