Disease-Associated Mutations of TREM2 Alter the Processing of N-Linked Oligosaccharides in the Golgi Apparatus. 2015

Ji-Seon Park, and In Jung Ji, and Hyun Joo An, and Min-Ji Kang, and Sang-Wook Kang, and Dong-Hou Kim, and Seung-Yong Yoon
Alzheimer's Disease Experts Lab (ADEL), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea; Department of Brain Science, University of Ulsan College of Medicine, Seoul, Republic of Korea; Bio-Medical Institute of Technology (BMIT), University of Ulsan College of Medicine, Seoul, Republic of Korea; Cell Dysfunction Research Center (CDRC), University of Ulsan College of Medicine, Seoul, Republic of Korea.

The triggering receptor expressed on myeloid cells 2 (TREM2) is an immune-modulatory receptor involved in phagocytosis and inflammation. Mutations of Q33X, Y38C and T66M cause Nasu-Hakola disease (NHD) which is characterized by early onset of dementia and bone cysts. A recent, genome-wide association study also revealed that single nucleotide polymorphism of TREM2, such as R47H, increased the risk of Alzheimer's disease (AD) similar to ApoE4. However, how these mutations affect the trafficking of TREM2, which may affect the normal functions of TREM2, was not known. In this study, we show that TREM2 with NHD mutations are impaired in the glycosylation with complex oligosaccharides in the Golgi apparatus, in the trafficking to plasma membrane and further processing by γ-secretase. Although R47H mutation in AD affected the glycosylation and normal trafficking of TREM2 less, the detailed pattern of glycosylated TREM2 differs from that of the wild type, thus suggesting that precise regulation of TREM2 glycosylation is impaired when arginine at 47 is mutated to histidine. Our results suggest that the impaired glycosylation and trafficking of TREM2 from endoplasmic reticulum/Golgi to plasma membrane by mutations may inhibit its normal functions in the plasma membrane, which may contribute to the disease.

UI MeSH Term Description Entries
D008060 Lipodystrophy A collection of heterogenous conditions resulting from defective LIPID METABOLISM and characterized by ADIPOSE TISSUE atrophy. Often there is redistribution of body fat resulting in peripheral fat wasting and central adiposity. They include generalized, localized, congenital, and acquired lipodystrophy. Lipodystrophies
D008562 Membrane Glycoproteins Glycoproteins found on the membrane or surface of cells. Cell Surface Glycoproteins,Surface Glycoproteins,Cell Surface Glycoprotein,Membrane Glycoprotein,Surface Glycoprotein,Glycoprotein, Cell Surface,Glycoprotein, Membrane,Glycoprotein, Surface,Glycoproteins, Cell Surface,Glycoproteins, Membrane,Glycoproteins, Surface,Surface Glycoprotein, Cell,Surface Glycoproteins, Cell
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D009844 Oligosaccharides Carbohydrates consisting of between two (DISACCHARIDES) and ten MONOSACCHARIDES connected by either an alpha- or beta-glycosidic link. They are found throughout nature in both the free and bound form. Oligosaccharide
D010009 Osteochondrodysplasias Abnormal development of cartilage and bone. Dyschondroplasias,Hyperostosis Corticalis Generalisata,Melnick-Needles Syndrome,Multiple Epiphyseal Dysplasia,Schwartz-Jampel Syndrome,Spondyloepiphyseal Dysplasia,Chondrodystrophic Myotonia,Dyschondroplasia,Endosteal Hyperostosis, Autosomal Recessive,Hyperphosphatasemia Tarda,Late-Onset Spondyloepiphyseal Dysplasia,Melnick-Needles Osteodysplasty,Myotonic Chondrodystrophy,Myotonic Myopathy, Dwarfism, Chondrodystrophy, And Ocular And Facial Abnormalities,Osteodysplasty of Melnick and Needles,SED Tarda,SJA Syndrome,Schwartz Jampel Aberfeld syndrome,Schwartz-Jampel Syndrome, Type 1,Schwartz-Jampel-Aberfeld Syndrome,Sost Sclerosing Bone Dysplasia,Sost-Related Sclerosing Bone Dysplasia,Spondylo-Epimetaphyseal Dysplasia With Myotonia,Spondyloepiphyseal Dysplasia Tarda, X-Linked,Spondyloepiphyseal Dysplasia, Late,Van Buchem Disease,X-Linked SED,X-Linked SEDT,X-Linked Spondyloepiphyseal Dysplasia Tarda,Chondrodystrophy, Myotonic,Dysplasia, Spondyloepiphyseal,Late Onset Spondyloepiphyseal Dysplasia,Late Spondyloepiphyseal Dysplasia,Melnick Needles Osteodysplasty,Melnick Needles Syndrome,Myotonia, Chondrodystrophic,Osteochondrodysplasia,Osteodysplasty, Melnick-Needles,SED, X-Linked,SEDT, X-Linked,Schwartz Jampel Syndrome,Schwartz Jampel Syndrome, Type 1,Spondyloepiphyseal Dysplasia Tarda, X Linked,Spondyloepiphyseal Dysplasia, Late-Onset,Syndrome, Schwartz-Jampel-Aberfeld,X Linked SED,X Linked SEDT,X Linked Spondyloepiphyseal Dysplasia Tarda
D011971 Receptors, Immunologic Cell surface molecules on cells of the immune system that specifically bind surface molecules or messenger molecules and trigger changes in the behavior of cells. Although these receptors were first identified in the immune system, many have important functions elsewhere. Immunologic Receptors,Immunologic Receptor,Immunological Receptors,Receptor, Immunologic,Receptors, Immunological
D002462 Cell Membrane The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells. Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D004721 Endoplasmic Reticulum A system of cisternae in the CYTOPLASM of many cells. In places the endoplasmic reticulum is continuous with the plasma membrane (CELL MEMBRANE) or outer membrane of the nuclear envelope. If the outer surfaces of the endoplasmic reticulum membranes are coated with ribosomes, the endoplasmic reticulum is said to be rough-surfaced (ENDOPLASMIC RETICULUM, ROUGH); otherwise it is said to be smooth-surfaced (ENDOPLASMIC RETICULUM, SMOOTH). (King & Stansfield, A Dictionary of Genetics, 4th ed) Ergastoplasm,Reticulum, Endoplasmic
D006031 Glycosylation The synthetic chemistry reaction or enzymatic reaction of adding carbohydrate or glycosyl groups. GLYCOSYLTRANSFERASES carry out the enzymatic glycosylation reactions. The spontaneous, non-enzymatic attachment of reducing sugars to free amino groups in proteins, lipids, or nucleic acids is called GLYCATION (see MAILLARD REACTION). Protein Glycosylation,Glycosylation, Protein
D006056 Golgi Apparatus A stack of flattened vesicles that functions in posttranslational processing and sorting of proteins, receiving them from the rough ENDOPLASMIC RETICULUM and directing them to secretory vesicles, LYSOSOMES, or the CELL MEMBRANE. The movement of proteins takes place by transfer vesicles that bud off from the rough endoplasmic reticulum or Golgi apparatus and fuse with the Golgi, lysosomes or cell membrane. (From Glick, Glossary of Biochemistry and Molecular Biology, 1990) Golgi Complex,Apparatus, Golgi,Complex, Golgi

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