Ciliary microtubule inner protein 1 (CIMIP1)

Ciliary microtubule inner protein 1 (CIMIP1), encoded by the C20orf85 gene, is localized predominantly in ciliated cells and type II pneumocytes of the lung. In healthy tissue, it is implicated in the maintenance of ciliary structure and epithelial cell differentiation. Its expression is often lost or markedly reduced in non-small cell lung cancers, with epigenetic silencing (via promoter CpG methylation) as a common mechanism of inactivation. The loss of CIMIP1/LLC1 correlates with loss of cilia during lung carcinogenesis. Forced overexpression of the protein in cancer cell lines does not affect proliferation or migration, indicating its role is more structural/marker than functional as a therapeutic target. CIMIP1/LLC1 is therefore mainly considered a sensitive biomarker for lung epithelial differentiation and ciliary function, rather than a classical therapeutic target. It is also expressed in other ciliated epithelial cells such as renal tubular, pancreatic acinar, gastric, duodenal, and gallbladder epithelium. CIMIP1 is not considered a classical therapeutic target (such as receptor, enzyme, transporter, etc.), but primarily functions as a marker of normal ciliated epithelial cell differentiation and is absent in most non-small cell lung cancers. The loss of CIMIP1/LLC1 is correlated with carcinogenesis in lung tissue but does not directly drive cell proliferation or migration. There are no known drugs targeting CIMIP1 and no evidence of safety concerns or therapeutic mechanisms relevant to pharmacology. The major disease association is loss of expression in non-small cell lung cancer; its inactivation may act as a reflection of lost epithelial integrity and ciliation.

Other names

C20orf85LLC1bA196N14.1Low in Lung Cancer 1uncharacterized protein C20orf85