Cell division, a fundamental process for life, relies on the precise orchestration of tiny structures within cells called centrosomes. Novel research from the National University of Singapore (NUS) has revealed a critical role for a protein named NuSAP in safeguarding the integrity of these structures, offering insights into developmental disorders like microcephaly and mosaic variegated aneuploidy (MVA) syndrome. This discovery, published in Advanced Science on January 30, 2026, sheds light on the molecular mechanisms that ensure accurate cell division and genetic stability.
The centrosome acts as a “control centre” for cell division, ensuring each new cell receives the correct genetic instructions. Disruptions in centrosome regulation can lead to abnormal cell division and chromosome mishandling, potentially contributing to developmental problems or disease. Researchers have now identified NuSAP as a key player in stabilizing centrioles – the core components of the centrosome – and coordinating the recruitment of proteins essential for proper centrosome function. Understanding how NuSAP operates could pave the way for new therapeutic strategies for conditions linked to centrosome dysfunction.
NuSAP: A Guardian of Centriole Structure
For some time, NuSAP was known to be involved in organizing the spindle during mitosis, the process of cell division. However, this latest research demonstrates that NuSAP’s protective function extends earlier in the cell cycle, directly impacting centriole structure. The team, led by Associate Professor LIOU Yih-Cherng from the NUS Department of Biological Sciences, utilized super-resolution microscopy and biochemical assays to observe NuSAP’s activity at a detailed level. They found that NuSAP depletion disrupts the internal architecture of centrioles, leading to premature disengagement and instability.
Specifically, the research highlights NuSAP’s role in mediating the interaction between CEP57, CEP63 and CEP152 – proteins crucial for centrosome engagement. During the S to G2 phase of the cell cycle, CEP57 is gradually recruited to the procentriole, a precursor to the centriole. This recruitment is vital for the proper connection between the mother and procentrioles, and it’s a process heavily regulated by NuSAP and the overall structural integrity of the centriole.
Implications for Developmental Disorders
The findings have significant implications for understanding developmental disorders. Microcephaly, a condition characterized by an abnormally modest head, and MVA syndrome, a rare chromosomal disorder, are both linked to disruptions in centrosome function and chromosome instability. “Accurate cell division is fundamental to human development,” explained Dr. ZHANG Shiyu, a Research Fellow at the NUS Department of Biological Sciences. “Our study shows that the protein NuSAP acts as a guardian of centrosome integrity.”
The research team discovered that when NuSAP is absent, centriole tubulin architecture is compromised, leading to disorganized pericentriolar material (PCM) – a structure surrounding the centrioles that plays a crucial role in organizing microtubules – and premature centriole disengagement. This disruption ultimately hinders proper cell division and can contribute to the development of these genetic disorders. The team’s work builds on previous understanding of NuSAP’s role in spindle microtubule stabilization, revealing a broader and earlier function in maintaining cellular health.
Future Research and Therapeutic Potential
The identification of NuSAP’s protective role opens new avenues for research into the underlying causes of centrosome-related diseases. Further investigation into the precise mechanisms by which NuSAP stabilizes centrioles and coordinates protein recruitment could lead to the development of targeted therapies aimed at restoring centrosome function in affected individuals. The use of super-resolution microscopy and biochemical assays in this study demonstrates the power of advanced imaging techniques in unraveling the complexities of cellular processes.
As researchers continue to explore the intricacies of centrosome regulation, NuSAP stands out as a critical component in ensuring the fidelity of cell division and safeguarding against developmental abnormalities. The ongoing work at NUS and elsewhere promises to deepen our understanding of these fundamental processes and potentially offer new hope for individuals affected by related genetic disorders.
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