title: Creating Knockouts of Conserved Oligomeric Golgi Complex Subunits Using CRISPR-Mediated Gene Editing Paired with a Selection Strategy Based on Glycosylation Defects Associated with Impaired COG Complex Function.
abstract: The conserved oligomeric Golgi (COG) complex is a key evolutionally conserved multisubunit protein machinery that regulates tethering and fusion of intra-Golgi transport vesicles. The Golgi apparatus specifically promotes sorting and complex glycosylation of glycoconjugates. Without proper glycosylation and processing, proteins and lipids will be mislocalized and/or have impaired function. The Golgi glycosylation machinery is kept in homeostasis by a careful balance of anterograde and retrograde trafficking to ensure proper localization of the glycosylation enzymes and their substrates. This balance, like other steps of membrane trafficking, is maintained by vesicle trafficking machinery that includes COPI vesicular coat proteins, SNAREs, Rabs, and both coiled-coil and multi-subunit vesicular tethers. The COG complex interacts with other membrane trafficking components and is essential for proper localization of Golgi glycosylation machinery. Here we describe using CRISPR-mediated gene editing coupled with a phenotype-based selection strategy directly linked to the COG complex's role in glycosylation homeostasis to obtain COG complex subunit knockouts (KOs). This has resulted in clonal KOs for each COG subunit in HEK293T cells and gives the ability to further probe the role of the COG complex in Golgi homeostasis.
authors.affiliation: Department of Physiology, University of Arkansas for Medical Sciences, 4301 West Markham Street, Little Rock, AR, 72205, USA.
authors.forename: Jessica Bailey
authors.initials: JB
authors.lastname: Blackburn
authors.affiliation: Department of Physiology, University of Arkansas for Medical Sciences, 4301 West Markham Street, Little Rock, AR, 72205, USA. vvlupashin@uams.edu.
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Lupashin
mesh_terms: D064112:Clustered Regularly Interspaced Short Palindromic Repeats; D020755:Coat Protein Complex I / Q000235:genetics / Q000378:metabolism; D000072669:Gene Editing / Q000379:methods*; D055786:Gene Knockout Techniques / Q000379:methods*; D006031:Glycosylation; D006056:Golgi Apparatus / Q000235:genetics / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D050600:SNARE Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D020755:Coat Protein Complex I; D050600:SNARE Proteins
keywords: COG; CRISPR; Cholera toxin; Conserved oligomeric Golgi complex; FAC sorting; Fluorescently tagged lectins; Glycosylation defects; Knockouts; SubAB toxin