Ceroid Lipofuscinosis Neuronal Protein 8 (CLN8)

CLN8encodes a transmembrane protein belonging to a family of proteins containing TLC domains, which are postulated to function in lipid synthesis, transport, or sensing. The protein localizes to the endoplasmic reticulum (ER), and may recycle between the ER and ER-Golgi intermediate compartment. Mutations in this gene are associated with progressive epilepsy with mental retardation (EMPR), which is a subtype of neuronal ceroid lipofuscinoses (NCL). Patients with mutations in this gene have altered levels of sphingolipid and phospholipids in the brain.However, the truncated murine mnd mutant protein was found only in the ER. Mutations in the ER retrieval signal KKRP resulted in localization of CLN8 to the Golgi apparatus. The authors concluded that CLN8 is an ER resident protein that recycles between ER and ERGIC.