Down syndrome cell adhesion molecule (DSCAM)

Down syndrome cell adhesion molecule (DSCAM) is a member of the immunoglobulin superfamily of cell adhesion molecules, primarily involved in the development and wiring of the nervous system. In vertebrates, DSCAM is crucial for axonal pathfinding, dendritic patterning, neuron self-avoidance, and synaptic targeting by mediating homophilic cell-cell adhesion in a highly specific manner[3][5][6][7]. Alternative splicing of DSCAM, especially in invertebrates such as Drosophila, generates an extraordinary diversity of isoforms that enable fine-tuned neuronal identity and contact specificity, with over 38,000 possible variants described in some species[1][2][7]. In humans, DSCAM is encoded by a gene on chromosome 21 and its overexpression, as seen in trisomy 21, contributes to the altered neural development observed in Down syndrome[5][7]. DSCAM modulates cell adhesion by weakening cadherin-mediated interactions to ensure appropriate neuronal migration and spacing[5]. Despite its clear developmental functions, no drugs currently target DSCAM, nor is it used as a biomarker to date. Its dysfunction is linked with neurodevelopmental disorders, and animal models lacking DSCAM exhibit severe deficits in neural connectivity and embryonic morphogenesis[3][5][6].

Other names

Cell adhesion molecule DSCAMDSCAMCHD2-42CHD2-52CHD2Down syndrome cell adhesion moleculeDSCAM1 (in invertebrates)Down's syndrome cell adhesion molecule