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In vivo function of the ER-Golgi transport protein LMAN1 in photoreceptor homeostasis
Hong Hao1, Janina Gregorski, Haohua Qian
1Neurobiology-Neurodegeneration & Repair Laboratory, National Eye Institute, NIH, MSC0610, 6 Center Drive, 20892, Bethesda, MD, USA, haoh@mail.nih.gov.
Abstract:
LMAN1 is a type I transmembrane protein that selectively transports its cargo proteins from ER to ER-Golgi intermediate compartment (ERGIC) and Golgi. Lman1 is a direct target of the transcription factor NRL in mouse retina. Therefore, we examined the in vivo function of LMAN1 in retina. Although Lman1 (- / -) mouse eyes did not show abnormality in histology and electroretinogram analysis at 3 months, Lman1 (- / -) retina at 6 months showed a decrease in cis-Golgi markers GM130 and GRASP65. We also observed abnormal level and location of Rhodopsin in these mice. Taken together, LMAN1 may play a role in photoreceptor gene transport and homeostasis.
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