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NDE1
NDE1 Full Name
nudE nuclear distribution E homolog 1 (A. nidulans)
NDE1 Introduction
NDE1 (nudE neurodevelopment protein 1) encodes a coiled-coil protein that is essential for the earliest steps of brain development, where it coordinates the machinery that moves dividing cells and newborn neurons into their correct positions. The protein owes its name to its homology with the fungal nudE protein, which in Aspergillus controls the distribution of nuclei along the hypha through the cytoplasmic dynein motor; in mammals NDE1 performs the analogous job of coupling dynein to the microtubule cytoskeleton and to the centrosome, the organelle that organizes cell division. During cortical development NDE1 functions in partnership with LIS1, the product of the gene mutated in classical lissencephaly, and with the dynein motor complex to drive the interkinetic nuclear migration of neural progenitor cells and the migration of postmitotic neurons. Loss-of-function mutations in NDE1 cause severe microlissencephaly, a disorder combining an abnormally small and smooth brain with profound intellectual disability, and the gene has also been implicated in schizophrenia and other neuropsychiatric conditions through rare genetic variants. Beyond the brain, NDE1 participates in mitotic spindle orientation and in the biology of primary cilia, connecting this small protein to a broad range of developmental processes.
Figure 1. Nde1 is required for heterochromatin compaction and stability in neocortical neurons.(Chomiak A A, 2022)
Coiled-Coil Protein, Dynein Regulation, and Centrosomal Functions
The NDE1 protein is built predominantly from coiled-coil segments that mediate its self-association and its binding to partner proteins.
Its principal binding partner is LIS1 (PAFAH1B1), with which it forms a complex that recruits and regulates cytoplasmic dynein, the microtubule motor responsible for movement toward the minus end of microtubules.
NDE1 also interacts directly with components of the dynein machinery and with additional proteins of the centrosome, positioning it at the interface between the motor and its cargo.
The NDE1 gene is located on human chromosome 16, within a region whose copy-number variation is associated with neurodevelopmental phenotypes.
During the cell cycle, NDE1 localizes to the centrosome and to kinetochores, and its phosphorylation by cyclin-dependent kinases and other mitotic kinases governs its activity at different mitotic stages.
In neural progenitors, NDE1 function is required for the oscillatory movement of nuclei within the ventricular zone, a process that coordinates progenitor proliferation with the production of neurons.
The protein also localizes to primary cilia, where it participates in signaling pathways that influence progenitor cell fate.
Cortical Development, Microlissencephaly, and Neuropsychiatric Associations
During cerebral cortical development NDE1 enables the interkinetic nuclear migration of neural progenitor cells, ensuring that DNA replication and mitosis occur at the appropriate positions within the neuroepithelium.
Together with LIS1 and dynein, NDE1 supports the migration of postmitotic neurons from the ventricular zone to the cortical plate, a process whose failure results in malformations of cortical development.
Homozygous or compound heterozygous loss-of-function mutations in NDE1 cause severe microlissencephaly, characterized by extreme microcephaly, a smooth cortical surface, and severe developmental delay, reflecting the essential role of the protein in generating and positioning cortical neurons.
Partial reduction of NDE1 function, by contrast, has been associated with milder neurodevelopmental phenotypes, and rare variants at the NDE1 locus have been reported in individuals with schizophrenia and autism spectrum disorders.
Because the same dynein-regulatory machinery is used throughout the body, NDE1 mutations can also affect other tissues, but the exquisite sensitivity of the developing brain makes neurogenesis its most visible function.
Studies of NDE1 continue to inform the broader understanding of how centrosomal and microtubule-based mechanisms build the cerebral cortex and how their disruption causes human neurodevelopmental disease.
Alternate Names for NDE1
NDE1; nudE nuclear distribution E homolog 1 (A. nidulans); nudE nuclear distribution gene E homolog 1 (A. nidulans); nuclear distribution protein nudE homolog 1; FLJ20101; NUDE; nudE nuclear distribution gene E homolog 1; LIS1-interacting protein NUDE1, rat homolog; LIS4; NUDE1; HOM-TES-87;
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