Dopaminergic Neuron Development in Parkinson's Disease

Dopaminergic neurons arise from progenitor cells in the ventral midbrain under the coordinated influence of morphogens such as Sonic Hedgehog, Wnt and FGF, and the action of transcription factors including Lmx1a/b, Foxa2 and En1. These signals direct the specification, differentiation and maturation of A9 neurons in the substantia nigra pars compacta, which project along the nigrostriatal pathway to regulate motor function. In Parkinson’s disease, selective degeneration of these neurons leads to the characteristic motor deficits, while dysfunction in parallel dopaminergic circuits contributes to non-motor symptoms. Understanding normal development has informed strategies for in vitro differentiation of human pluripotent stem cells into dopaminergic cells and the creation of three-dimensional models. Such advances are central to efforts in cell replacement therapy, disease modelling and drug discovery, and highlight the interplay between developmental biology and translational approaches aimed at halting or reversing neuronal loss in Parkinson’s disease.

Research from Nature Portfolio

Recent studies have established spatially arranged ventral midbrain–striatum–cortex assembloids that faithfully recapitulate long-range dopaminergic innervation and synaptic function. These three-dimensional human models enable the examination of neuronal maturation, connectivity and response to pharmacological agents, opening avenues for preclinical evaluation of cell therapies and drugs. Additionally, single-cell transcriptomic analysis of developing midbrain neurons in model organisms has delineated multiple molecularly defined dopaminergic subgroups, revealing two major developmental branches and evolutionary conservation of gene-expression programmes. This work provides a detailed cell atlas to guide the production of authentic human dopaminergic subtypes for regenerative applications.

Dopaminergic Neuron Development in Parkinson's Disease publication trend

The graph below shows the total number of articles in dopaminergic neuron development in parkinson's disease across all publications each year (not limited to Nature Index journals).

Technical terms

Dopaminergic neuron: A nerve cell that produces and releases dopamine, crucial for motor control and reward processing.

Substantia nigra pars compacta: A region in the ventral midbrain where A9 dopaminergic neurons originate and degenerate in Parkinson’s disease.

Pluripotent stem cell: A cell capable of giving rise to all cell types of the body, used to generate dopaminergic neurons in vitro.

Organoid: A three-dimensional tissue culture model that mimics aspects of organ structure and function.

Assembloid: A fused organoid system that recreates interactions between distinct brain regions, such as ventral midbrain and striatum.

Single-cell RNA sequencing: A method to measure gene expression in individual cells, enabling classification of neuronal subtypes.

References

1. In vitro modeling of the human dopaminergic system using spatially arranged ventral midbrain–striatum–cortex assembloids. Nature Methods (2023).
2. Molecular Diversity of Midbrain Development in Mouse, Human, and Stem Cells. Cell (2016).
3. How to make a midbrain dopaminergic neuron. Development (2015).
4. Molecular determinants of selective dopaminergic vulnerability in Parkinson’s disease: an update. Frontiers in Neuroanatomy (2014).
5. Dopamine and Acetylcholine, a Circuit Point of View in Parkinson’s Disease. Frontiers in Neural Circuits (2017).