Supplementary Table 1: A list of the 103 modifiers (58 Suppressors, 45 Enhancers) of VAP functions discovered in our genetic screen. The modifiers are listed in alphabetical order of their Flybase symbol. Symbol Ars2 Name - Modifier class Flybase Gene Number Enhancer response toFBgn0033062 arsenic, Bmcp Bmcp Suppressor FBgn0036199 Bx Beadex Enhancer FBgn0000242 Cdc6 CG10089 CG11560 CG11811 CG12743 Cdc6 ovarian tumor Enhancer Suppressor Suppressor Suppressor Enhancer FBgn0035918 FBgn0036369 FBgn0036249 FBgn0036099 FBgn0003023 CG12822 CG13048 CG13063 CG13075 CG13296 - Suppressor Enhancer Suppressor Suppressor Enhancer FBgn0033229 FBgn0036593 FBgn0036601 FBgn0036563 FBgn0035687 CG13387 embargoed Enhancer FBgn0020497 Function response to arsenic, catalytic step2 spliceosome negative regulation of viral genome replication conversion of ds siRNA to ss siRNA involved in RNA interference gene silencing by miRNA nuclear mRNA splicing, via spliceosome regulation of metabolic process,mitochondrial transmembrane transport imaginal disc-derived leg segmentation leg disc development locomotor rhythm response to cocaine phagocytosis, engulfment inter-male aggressive behavior pre-replicative complex assembly protein dephosphorylation purine nucleotide metabolic process female germ-line sex determination, germ cell development germ cell development germ-line cyst formation germ-line sex determination oogenesis chromosome organization positive regulation of DNA endoreduplication chitin metabolic process nucleic acid binding protein export from nucleus, multicellular organismal development protein export from nucleus protein transport protein export from nucleus nuclear export centriole replication CG13994 CG14043 CG14125 CG14222 CG14326 CG14435 CG14606 smallminded - Enhancer Suppressor Suppressor Enhancer Suppressor Enhancer Suppressor FBgn0031772 FBgn0031659 FBgn0036232 FBgn0031043 FBgn0038528 FBgn0029911 FBgn0037485 CG14837 CG15160 CG17327 CG17760 - Suppressor Enhancer Suppressor Suppressor FBgn0035797 FBgn0032688 FBgn0038107 FBgn0033756 CG17985 CG18110 CG30043 CG30060 CG30161 CG31702 CG31769 CG32437 CG32685 CG32703 CG33090 - Suppressor Suppressor Suppressor Suppressor Enhancer Enhancer Suppressor Suppressor Suppressor Suppressor Suppressor FBgn0033199 FBgn0039677 FBgn0050043 FBgn0050060 FBgn0050161 FBgn0051702 FBgn0051769 FBgn0052437 FBgn0052685 FBgn0052703 FBgn0028916 CG34113 CG3476 - Enhancer Suppressor FBgn0083949 FBgn0031881 CG3500 CG3884 CG3975 CG4169 - Enhancer Enhancer Suppressor Suppressor FBgn0034849 FBgn0033786 FBgn0027559 FBgn0250814 CG42255 - Suppressor FBgn0259140 CG4627 CG4646 CG5325 CG5733 Nucleoporin 75 Suppressor Suppressor Suppressor Enhancer FBgn0033808 FBgn0033810 FBgn0032407 FBgn0034310 chitin metabolic process metabolic process phagocytosis, engulfment, hexose transmembrane transport translation G-protein coupled receptor protein signaling pathway, protein ADP-ribosylation cell wall macromolecule catabolic process sodium ion transport proteolysis neurogenesis transcription initiation, DNA-dependent biological_process protein phosphorylation bile acid metabolic process, O-glycoside catabolic process glucosylceramide catabolic process acyl carnitine transport, carnitine transport mitochondrial transport transmembrane transport DNA replication mitochondrial electron transport, ubiquinol to cytochrome c, proteolysis lipid particle associated microtubule associated complex Microtubule associated complex, calcium binding, metalloendopeptidase biological_process nervous system development , peroxisome SMAD protein nuclear translocation,NLSbearing substrate import into nucleus CG5953 CG6048 CG6220 Enhancer of Polycomb - Suppressor Suppressor Enhancer FBgn0032587 FBgn0029827 FBgn0033865 proteolysis - Suppressor FBgn0037816 CG6502 Enhancer of zeste Enhancer FBgn0000629 CG6674 CG6885 CG6950 CG7306 CG7564 CG7564 (Alsin2) obstructor-F - Enhancer Suppressor Suppressor Enhancer Enhancer Suppressor FBgn0036063 FBgn0036810 FBgn0037955 FBgn0036947 FBgn0036734 FBgn0037116 CG7776 CG8219 CG8571 CG8863 CG9172 DnaJ-like-2 - Enhancer Enhancer Enhancer Enhancer Enhancer FBgn0000581 FBgn0035693 FBgn0016983 FBgn0038145 FBgn0030718 CG9391 CG9638 Ada2b Enhancer Enhancer FBgn0037063 FBgn0037555 CG9953 - Enhancer FBgn0035726 regulation of cyclin-dependent protein kinase activity,tRNA modification histone methylation, chromatin silencing histone methylation syncytial blastoderm mitotic cell cycle axon guidance muscle organ development dendrite morphogenesis neurogenesis histone H3-K27 methylation histone H3-K27 methylation histone H3-K9 methylation histone methylation cuticle hydrocarbon biosynthetic process biosynthetic process chitin metabolic process nuclear mRNA splicing, via spliceosome Rab guanyl-nucleotide exchange factor activity,Regulator of chromosome condensation, RCC1; Vacuolar sorting protein 9 chromatin organization protein import into nucleus, nuclear pore protein folding, response to heat mitochondrial electron transport, NADH to ubiquinone, determination of adult lifespan mitochondrial respiratory chain complex I assembly response to reactive oxygen species dephosphorylation positive regulation of histone acetylation, regulation of transcription , SAGA complex, polytene chromosome chromatin remodeling cell proliferation histone H3 acetylation eye pigment metabolic process proteolysis CG6345 Cyp4ac1 Cyp4ac1 Suppressor FBgn0031693 Cyp6a19 Cyp6a2 Cyp6a19 Cytochrome P450-6a2 Cytochrome P450-9b2 dilatory Suppressor Suppressor FBgn0033979 FBgn0000473 Suppressor FBgn0015039 Suppressor FBgn0033447 dynactinsubunit-p25 ENL/AF9related Enhancer FBgn0040228 Suppressor FBgn0026441 Elongation factor 1 beta eIF2B-delta Enhancer FBgn0028737 transcription initiation from RNA polymerase II promoter,regulation of transcription, DNAdependent translational elongation Enhancer FBgn0034858 translational initiation, neurogenesis epsilonCOP Suppressor FBgn0027496 Glycogen phosphorylase Heat shock protein 83 Icln Suppressor FBgn0004507 retrograde vesicle-mediated transport, Golgi to ER glycogen catabolic process, flight Suppressor FBgn0001233 Spermatogenesis, Enhancer FBgn0029079 Iron regulatory protein 1B Karyopherin beta 3 lethal (1) G0222 lethal (2) 35Cc mitochondrial ribosomal protein S34 myospheroid Suppressor FBgn0024957 cell volume homeostasis , chloride transport , volume sensitive anion channel regulation of translational initiation by iron Enhancer FBgn0087013 protein import into nucleus Suppressor Enhancer Enhancer FBgn0028343 FBgn0259982 FBgn0260460 unfolded protein binding,protein folding mitochondrial small ribosomal subunit Enhancer FBgn0004657 central nervous system development,cell migration midgut development muscle attachment calcium-dependent cell-cell adhesion calcium-dependent cell-matrix adhesion cell-matrix adhesion heterophilic cell-cell adhesion apposition of dorsal and ventral imaginal discderived wing surfaces cell adhesion Cyp9b2 dila dyn-p25 ear Ef1beta eIF2Bdelta epsilonCO P GlyP Hsp83 icln Irp-1B Karybeta3 l(1)G0222 l(2)35Cc mRpS34 mys hormone metabolic process, insecticide catabolic process oxidation-reduction process response to insecticide, response to caffeine, oxidation-reduction process microsome adult locomotory behavior, cilium axoneme assembly, spermatogenesis, peripheral nervous system neuron development microtubule-based movement NaPi-T Nlp Osi20 pallidin porin PrBP Prx5 snama SOD1 ssh Na[+]dependent inorganic phosphate cotransporter Nucleoplasmin Osiris 20 pallidin porin Suppressor FBgn0016684 Enhancer Suppressor Enhancer Enhancer FBgn0016685 FBgn0037430 FBgn0036192 FBgn0004363 Prenyl-binding protein Peroxiredoxin 5 Enhancer FBgn0032059 Suppressor FBgn0038570 something that sticks like glue Superoxide dismutase Suppressor FBgn0086129 Suppressor FBgn0003462 slingshot Enhancer FBgn0029157 regulation of cell shape axon guidance dorsal closure epithelial cell migration, open tracheal system tracheal outgrowth, open tracheal system maintenance of epithelial integrity, open tracheal system hemocyte migration substrate-dependent cell migration, cell extension, determination of adult lifespan germ-line stem cell maintenance sensory perception of smell imaginal disc-derived male genitalia morphogenesis cell-substrate adhesion integrin-mediated signaling pathway cell-matrix adhesion phosphate transport nucleosome positioning biological_process unknown mitochondrial transport , mitochondrial transport ion transport phototransduction sperm individualization mitochondrion organization sperm mitochondrion organization transmembrane transport Enhancer regulation of anion transport mushroom body development,visual perception , 3',5'-cyclic-GMP phosphodiesterase activity response to oxidative stress, peroxisome, mitochondrion, cell redox homeostasis Superoxide dismutase (Cu/Zn) / chaperones; Superoxide dismutase, copper/zinc binding domain; Superoxide dismutase, copper/zinc, binding site, response to oxidative stress protein dephosphorylation, actin cytoskeleton organization Su(P) Suppressor of ref(2)P sterility TBPH Suppressor FBgn0004465 Suppressor FBgn0025790 tectonic tmod Tor tectonic tropomodulin Target of rapamycin Suppressor Suppressor Enhancer FBgn0261697 FBgn0082582 FBgn0021796 torp4a Tsp2A Use1 torp4a Tetraspanin 2A Use1 Suppressor Enhancer Suppressor FBgn0025615 FBgn0024361 FBgn0035965 Zif Zinc-finger protein zye Enhancer FBgn0037446 Suppressor FBgn0036985 TBPH zye regulation of actin polymerization or depolymerization mushroom body development regulation of axonogenesis regulation of lamellipodium assembly mitotic cell cycle protein dephosphorylation cell redox homeostasis, protein disulfide oxidoreductase neuromuscular junction development,adult locomotory behavior, RNA metabolism regulation of smoothened signaling pathway cytoskeleton organization Growth, response to nutrient phosphorylation detection of nutrient positive regulation of cell size positive regulation of organ growth positive regulation of cell growth positive regulation of multicellular organism growth determination of adult lifespan autophagy multicellular organism growth gonad development positive regulation of cell growth endocytic recycling regulation of cell growth positive regulation of cell size positive regulation of ribosome biogenesis response to DNA damage stimulus dendrite morphogenesis protein folding, Endoplasmic reticulum lumen integral to membrane Golgi organization, neurogenesis, protein secretion establishment or maintenance of neuroblast polarity, neuroblast proliferation regulation of embryonic cell shape, filamentous actin cell-matrix adhesion actin filament organization