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Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells NPCs
Published on: March 2, 2018
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Ttc21b is required for proper proliferation of neural progenitor cells
Rebekah Niewoehner1, David Paulding2, Jesus M Leal1
1Steve and Cindy Rasmussen Institute for Genomic Medicine, Abigail Wexner Research Institute, Nationwide Children's Hospital, Columbus, OH 43205, USA.
Disease Models & Mechanisms
|December 12, 2025
Summary
Ttc21b is essential for mouse forebrain development. Its absence disrupts neural progenitor cell division and differentiation, leading to microcephaly and altered brain structure.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Primary cilia are crucial for cellular signaling and development.
- Genetic defects in primary cilia are linked to human microcephaly.
Purpose of the Study:
- To investigate the role of Ttc21b, an intraflagellar transport-A complex component, in mouse forebrain development.
- To understand the cellular mechanisms underlying Ttc21b-associated microcephaly.
Main Methods:
- Utilized a Ttc21b alien null allele in mice.
- Performed histological and immunohistochemical analyses of mutant brains.
- Examined neural progenitor proliferation and differentiation kinetics.
Main Results:
- Homozygous Ttc21b mutants exhibit significant microcephaly.
- Disrupted neural progenitor proliferation and differentiation were observed.
- Alterations in mitotic spindle angles and reduced cortical plate thickness were noted.
Conclusions:
- Ttc21b is critical for normal mouse forebrain development.
- Early Ttc21b expression is necessary for sustained neural progenitor proliferation and differentiation.
- Defects in Ttc21b function contribute to microcephaly via disrupted cell division and differentiation.
