Cytoplasmic dynein 1 light intermediate chain 1

Cytoplasmic dynein 1 light intermediate chain 1 (DYNC1LI1) is a non-catalytic accessory component of the cytoplasmic dynein 1 motor complex that facilitates cargo linking and dynein function in retrograde microtubule-dependent transport (UniProt: Q9Y6G9). The protein participates in intracellular vesicle and organelle motility, organelle positioning, and spindle checkpoint control, including phosphorylation-dependent regulation of kinetochore protein removal and Rab11-mediated endosomal recycling along microtubules.

In Alzheimer's Disease, DYNC1LI1 shows consistent downregulation in post-mortem human AD brain tissue compared to age-matched controls (Chaparral AD proteomics). Quantitative proteomics analysis across subcellular fractions detected the protein with a mean log2 fold-change of −0.48, indicating moderate reduction. This downregulation was observed in multiple subcellular compartments, suggesting a widespread decrease in dynein-mediated transport machinery availability in AD-affected tissue.

The reduced expression of this critical motor protein component may contribute to impaired axonal transport and organellar dysfunction observed in Alzheimer's pathology, potentially affecting neuronal homeostasis and contributing to neurodegeneration.