Cell cycle exit and neuronal differentiation protein 1 (CEND1)

Cell cycle exit and neuronal differentiation protein 1 (CEND1), also known as BM88, is a neuronal lineage-specific transmembrane protein that plays a pivotal role in linking cell cycle exit with neuronal differentiation of neural precursor cells[1][3][5]. Expressed throughout the neuronal lineage from neural stem/progenitor cells to mature neurons, CEND1 orchestrates the timing of neuron-generating divisions, primarily promoting neuronal cell fate by downregulating proliferation-driving proteins (e.g., cyclin D1), upregulating cell cycle exit markers (e.g., p21), and suppressing Notch signaling[1][3][5]. Mechanistically, CEND1 acts through the p53-dependent Cyclin D1/pRb pathway and interacts with other regulatory proteins such as Ran-binding protein M (RanBPM) and kinase Dyrk1B to fine-tune the balance between proliferation and differentiation in developing neural tissue[2][3]. Loss-of-function models show deficits in neuronal differentiation, excess proliferation, and increased developmental apoptosis, underscoring its necessity for normal brain structure and function[3][5]. Although not a classical therapeutic target, its neurogenic and differentiation-promoting properties suggest possible utility in CNS repair or regeneration strategies[3][5].

Other names

BM88BM88 antigenFLJ90066

Not applicable (no direct drugging known; acts via modulation of cell cycle and neural differentiation pathways)