Molecular Mechanisms of Cell Adhesion in Neural Development

Cell adhesion underpins the assembly, patterning and function of the nervous system by directing how neurons recognise each other and establish precise connections. Key families of adhesion molecules, notably the Down syndrome cell adhesion molecule (Dscam) and the protocadherins (Pcdhs), generate extraordinary molecular diversity through alternative splicing or clustered genomic organisation. This diversity enables neurites to discriminate self from non-self, enforce dendritic self-avoidance and dictate synaptic specificity. At the molecular level, adhesive ectodomains engage in cis-interactions on the same cell surface and trans-interactions between opposing membranes to form recognition lattices or “zipper-like” assemblies. Intracellular domains of these molecules couple to cytoskeletal regulators and signalling cascades, coordinating axon guidance, synapse formation, branch elaboration and neuronal survival. Dysregulation of adhesion codes has been linked to synaptic miswiring and neurodevelopmental disorders, highlighting both fundamental and translational significance.

Research from Nature Portfolio

Recent structural studies of truncated Dscam homologues in chelicerate arthropods have illuminated how a streamlined adhesion molecule mediates self-recognition. Crystallographic analyses revealed that the shortened Dscam (sDscam) forms side-by-side cis assemblies via fibronectin-type III domains and engages hand-in-hand trans contacts through immunoglobulin domains. Functional assays support a “molecular zipper” model, in which alternating cis and trans interfaces generate extended adhesive arrays. This work provides an evolutionary perspective on how diverse isoform-generating strategies arose and furnishes a molecular framework for understanding cell-cell recognition across invertebrate and vertebrate lineages.

Molecular Mechanisms of Cell Adhesion in Neural Development publication trend

The graph below shows the total number of articles in molecular mechanisms of cell adhesion in neural development across all publications each year (not limited to Nature Index journals).

Technical terms

Cell adhesion molecule (CAM): A transmembrane protein that mediates binding between cells or between a cell and the extracellular matrix.

Protocadherin (Pcdh): A subfamily of cadherin adhesion proteins encoded by clustered gene arrays, contributing to neuronal identity through combinatorial expression.

Dscam: Down syndrome cell adhesion molecule, an adhesion protein with extensive isoform diversity generated by alternative splicing.

Cis interaction: Lateral association of adhesion molecules on the same cell membrane.

Trans interaction: Binding between adhesion molecules on opposing cell membranes.

Isoform: One of several protein variants produced from a single gene by alternative splicing or differential promoter use.

References

1. Structural basis for the self-recognition of sDSCAM in Chelicerata. Nature Communications (2023).
2. γ-Protocadherins control synapse formation and peripheral branching of touch sensory neurons. Neuron (2023).
3. Combinatorial expression of γ-protocadherins regulates synaptic connectivity in the mouse neocortex. eLife (2024).
4. A systematic CRISPR screen reveals redundant and specific roles for Dscam1 isoform diversity in neuronal wiring. PLOS Biology (2023).