TRAPPC8

gene
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Also known as HsT2706TRS85GSG1

Summary

TRAPPC8 (trafficking protein particle complex subunit 8, HGNC:29169) is a protein-coding gene on chromosome 18q12.1, encoding Trafficking protein particle complex subunit 8 (Q9Y2L5). Plays a role in endoplasmic reticulum to Golgi apparatus trafficking at a very early stage. It is a common-essential gene (DepMap: required in 98.7% of cancer cell lines).

Involved in Golgi organization and collagen biosynthetic process. Part of TRAPP complex.

Source: NCBI Gene 22878 — RefSeq curated summary.

At a glance

  • Clinical variants (ClinVar): 234 total
  • Cancer dependency (DepMap): dependent in 98.7% of screened cell lines (common-essential)
  • MANE Select transcript: NM_014939

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:29169
Approved symbolTRAPPC8
Nametrafficking protein particle complex subunit 8
Location18q12.1
Locus typegene with protein product
StatusApproved
AliasesHsT2706, TRS85, GSG1
Ensembl geneENSG00000153339
Ensembl biotypeprotein_coding
OMIM614136
Entrez22878

Gene structure

Transcript identifiers

Ensembl transcripts: 19 — 11 protein_coding, 4 retained_intron, 3 protein_coding_CDS_not_defined, 1 nonsense_mediated_decay

ENST00000283351, ENST00000577426, ENST00000577474, ENST00000578252, ENST00000578658, ENST00000578886, ENST00000580104, ENST00000581057, ENST00000582509, ENST00000582513, ENST00000582539, ENST00000584604, ENST00000584876, ENST00000865827, ENST00000865828, ENST00000865829, ENST00000865830, ENST00000923366, ENST00000923367

RefSeq mRNA: 1 — MANE Select: NM_014939 NM_014939

CCDS: CCDS11901

Canonical transcript exons

ENST00000283351 — 29 exons

ExonStartEnd
ENSE000010102363190746031907610
ENSE000010102423191336931913522
ENSE000010102453190830331908418
ENSE000011081313191757831917667
ENSE000011081343190092531901025
ENSE000011081363187037231870502
ENSE000011081373189073531890866
ENSE000011081413187092631871120
ENSE000011081423190875431909010
ENSE000011081433185754031857982
ENSE000011081463189778631897891
ENSE000011081493190966731909760
ENSE000011081543191627231916446
ENSE000011081563186740231867476
ENSE000011081583186684931866975
ENSE000011081623186462731864781
ENSE000018347393194260831943128
ENSE000018606323182919731830989
ENSE000035006043183931231839457
ENSE000035061253184956631849739
ENSE000035152123185566031855807
ENSE000035734733193132931931523
ENSE000035959053185244631852504
ENSE000035992523185384931853945
ENSE000036212353184671631846817
ENSE000036471243185259531852663
ENSE000036682103183208431832173
ENSE000037252803187448031874704
ENSE000037496223187343031873538

Expression profiles

Bgee: expression breadth ubiquitous, 300 present calls, max score 98.42.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 24.4013 / max 158.4253, expressed in 1814 samples.

FANTOM5 promoters (3 alternative TSS)

Promoter IDTPM avgSamples expressed
17159322.08181812
1715941.91891042
1715950.4005168

Top tissues by expression

301 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
hair follicleUBERON:000207398.42gold quality
primordial germ cell in gonadCL:0000670 ∩ UBERON:000099197.48gold quality
tongue squamous epitheliumUBERON:000691997.34gold quality
jejunal mucosaUBERON:000039997.32gold quality
caput epididymisUBERON:000435897.24gold quality
spermCL:000001997.08gold quality
superior surface of tongueUBERON:000737197.04gold quality
renal medullaUBERON:000036296.71gold quality
male germ cellCL:000001596.68gold quality
cardia of stomachUBERON:000116296.68gold quality
bronchial epithelial cellCL:000232896.65gold quality
corpus epididymisUBERON:000435996.62gold quality
pylorusUBERON:000116696.54gold quality
cauda epididymisUBERON:000436096.54gold quality
mammary ductUBERON:000176596.48gold quality
tongueUBERON:000172396.43gold quality
superficial temporal arteryUBERON:000161496.34gold quality
skeletal muscle tissue of biceps brachiiUBERON:000450296.32gold quality
oral cavityUBERON:000016796.22gold quality
pharyngeal mucosaUBERON:000035596.21gold quality
jejunumUBERON:000211596.09gold quality
body of tongueUBERON:001187695.91gold quality
mucosa of paranasal sinusUBERON:000503095.88gold quality
epithelium of mammary glandUBERON:000324495.82gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451195.81gold quality
pericardiumUBERON:000240795.74gold quality
biceps brachiiUBERON:000150795.65gold quality
trigeminal ganglionUBERON:000167595.60gold quality
ponsUBERON:000098895.58gold quality
upper leg skinUBERON:000426295.45gold quality

Single-cell (SCXA)

Detected in 3 experiment(s), a significant marker in 2.

ExperimentMarker?Max mean expression
E-GEOD-100618yes718.37
E-ANND-3yes6.52
E-MTAB-6386no390.39

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

139 targeting TRAPPC8, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-429100.0073.442698
HSA-MIR-200B-3P100.0073.312693
HSA-MIR-200C-3P100.0073.352685
HSA-MIR-5692B100.0071.322622
HSA-MIR-5692C100.0071.322622
HSA-MIR-3924100.0072.092394
HSA-MIR-340-5P100.0072.504437
HSA-MIR-5193100.0067.261744
HSA-MIR-513A-5P100.0069.772465
HSA-MIR-1252-5P100.0069.802774
HSA-MIR-1277-5P100.0073.955056
HSA-MIR-4283100.0066.422097
HSA-MIR-186-5P99.9970.833707
HSA-MIR-371A-3P99.9966.7791
HSA-MIR-27A-3P99.9872.132955
HSA-MIR-27B-3P99.9872.132955
HSA-MIR-998599.9872.112939
HSA-MIR-520D-5P99.9873.344883
HSA-MIR-524-5P99.9873.434882
HSA-MIR-477599.9875.006394
HSA-MIR-4482-3P99.9872.503147
HSA-MIR-1185-1-3P99.9871.042593
HSA-MIR-1185-2-3P99.9871.042593
HSA-LET-7F-2-3P99.9870.982588
HSA-MIR-548P99.9872.253784
HSA-MIR-3065-5P99.9771.563281
HSA-MIR-50799.9770.111915
HSA-MIR-302C-5P99.9772.563642
HSA-MIR-60799.9773.625593
HSA-MIR-314899.9775.066478

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 98.7% of screened cell lines, common-essential.

Literature-anchored findings (GeneRIF, showing 2)

  • Data show that a disease-causing mutation of TRAPPC2, D47Y, failed to interact with either TRAPPC9 or TRAPPC8, suggesting that aspartate 47 in TRAPPC2 is at or near the site of interaction with TRAPPC9 or TRAPPC8. (PMID:21858081)
  • TRAPPC8 modulates autophagy and secretory trafficking and is required for TBC1D14 to bind TRAPPIII. (PMID:26711178)

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_reriotrappc8ENSDARG00000038866
mus_musculusTrappc8ENSMUSG00000033382
rattus_norvegicusTrappc8ENSRNOG00000022202
drosophila_melanogasterl(3)76BDmFBGN0260655
caenorhabditis_eleganstrpp-8WBGENE00018512

Protein

Protein identifiers

Trafficking protein particle complex subunit 8Q9Y2L5 (reviewed: Q9Y2L5)

Alternative names: Protein TRS85 homolog

All UniProt accessions (6): Q9Y2L5, J3KSL8, J3QQJ5, J3QQS5, J3QR00, J3QSA1

UniProt curated annotations — full annotation on UniProt →

Function. Plays a role in endoplasmic reticulum to Golgi apparatus trafficking at a very early stage. Maintains together with TBC1D14 the cycling pool of ATG9 required for initiation of autophagy. Involved in collagen secretion.

Subunit / interactions. Component of the multisubunit TRAPP (transport protein particle) complex, which includes TRAPPC2, TRAPPC2L, TRAPPC3, TRAPPC3L, TRAPPC4, TRAPPC5, TRAPPC8, TRAPPC9, TRAPPC10, TRAPPC11 and TRAPPC12. Interacts with TBC1D14. Interacts (via C-terminus) with TMEM131 (via C-terminus); the interaction is direct and is involved in collagen secretion.

Subcellular location. Golgi apparatus. cis-Golgi network.

Miscellaneous. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay.

Similarity. Belongs to the TRS85 family.

Isoforms (2)

UniProt IDNamesCanonical?
Q9Y2L5-11yes
Q9Y2L5-22

RefSeq proteins (1): NP_055754* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR011990TPR-like_helical_dom_sfHomologous_superfamily
IPR024420TRAPP_III_complex_Trs85Family
IPR057651Ig_TPPC8_CDomain
IPR058538Ig_TPPC8_2ndDomain
IPR058540Ig_TPPC8_3rdDomain
IPR058541Ig_TPPC8_1stDomain

Pfam: PF12739, PF24542, PF24544, PF24545, PF24546

UniProt features (21 total): sequence variant 9, sequence conflict 3, modified residue 3, splice variant 2, chain 1, region of interest 1, mutagenesis site 1, compositionally biased region 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9Y2L5-F179.530.44

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Post-translational modifications (3): 273, 279, 309

Mutagenesis-validated functional residues (1):

PositionPhenotype
1035–1040attenuates interaction with tmem131.

Function

Pathways and Gene Ontology

Reactome pathways

1 pathways

IDPathway
R-HSA-8876198RAB GEFs exchange GTP for GDP on RABs

MSigDB gene sets: 254 (showing top): LI_CISPLATIN_RESISTANCE_DN, FAELT_B_CLL_WITH_VH_REARRANGEMENTS_DN, GOBP_VESICLE_LOCALIZATION, GNF2_BNIP2, GOBP_VESICLE_ORGANIZATION, AAGCCAT_MIR135A_MIR135B, KORKOLA_CHORIOCARCINOMA_DN, GOBP_VESICLE_TARGETING, TATTATA_MIR374, GENTILE_RESPONSE_CLUSTER_D3, GOBP_VESICLE_MEDIATED_TRANSPORT, REACTOME_MEMBRANE_TRAFFICKING, SENESE_HDAC1_AND_HDAC2_TARGETS_DN, chr18q12, GOBP_ENDOPLASMIC_RETICULUM_TO_GOLGI_VESICLE_MEDIATED_TRANSPORT

GO Biological Process (6): endoplasmic reticulum to Golgi vesicle-mediated transport (GO:0006888), Golgi organization (GO:0007030), collagen biosynthetic process (GO:0032964), COPII vesicle coat assembly (GO:0048208), obsolete vesicle tethering (GO:0099022), vesicle-mediated transport (GO:0016192)

GO Molecular Function (1): protein binding (GO:0005515)

GO Cellular Component (5): cytoplasm (GO:0005737), cytosol (GO:0005829), TRAPP complex (GO:0030008), TRAPPIII protein complex (GO:1990072), Golgi apparatus (GO:0005794)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Rab regulation of trafficking1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cytoplasm3
cellular anatomical structure2
intercellular transport1
intracellular transport1
Golgi vesicle transport1
organelle organization1
endomembrane system organization1
biosynthetic process1
collagen metabolic process1
vesicle coat assembly1
protein-containing complex assembly1
COPII-coated vesicle budding1
transport1
cellular process1
binding1
intracellular anatomical structure1
vesicle tethering complex1
intracellular protein-containing complex1
Golgi apparatus1
TRAPP complex1
endomembrane system1
intracellular membrane-bounded organelle1

Protein interactions and networks

STRING

1770 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
TRAPPC8TRAPPC2P0DI81993
TRAPPC8TRAPPC4Q9Y296989
TRAPPC8TRAPPC5Q8IUR0980
TRAPPC8TRAPPC13A5PLN9973
TRAPPC8TRAPPC11Q7Z392971
TRAPPC8TRAPPC12Q8WVT3970
TRAPPC8TRAPPC6AO75865966
TRAPPC8TRAPPC1Q9Y5R8966
TRAPPC8TRAPPC10P48553947
TRAPPC8TRAPPC9Q96Q05932
TRAPPC8TRAPPC3O43617916
TRAPPC8TRAPPC2LQ9UL33845
TRAPPC8TRAPPC6BQ86SZ2805
TRAPPC8RAB1AP11476796
TRAPPC8TBC1D14Q9P2M4754

IntAct

57 interactions, top by confidence:

ABTypeScore
TRAPPC2LTRAPPC13psi-mi:“MI:0914”(association)0.560
TRAPPC2LTRAPPC8psi-mi:“MI:0915”(physical association)0.560
MIS12SPC24psi-mi:“MI:0914”(association)0.530
TRAPPC1TRAPPC13psi-mi:“MI:0914”(association)0.530
TKTPOTEFpsi-mi:“MI:0914”(association)0.530
TPCN2AP3B1psi-mi:“MI:0914”(association)0.530
TRAPPC12TRAPPC3psi-mi:“MI:0914”(association)0.530
MYL6MYL6Bpsi-mi:“MI:0914”(association)0.530
TRAPPC8TRAPPC3psi-mi:“MI:0915”(physical association)0.400
TRAPPC13TRAPPC8psi-mi:“MI:0915”(physical association)0.400
TRAPPC8TRAPPC13psi-mi:“MI:0915”(physical association)0.400
TRAPPC8psi-mi:“MI:0915”(physical association)0.370
Trappc11TRAPPC3psi-mi:“MI:0914”(association)0.350
TRAPPC9TRAPPC8psi-mi:“MI:0914”(association)0.350
BMI1HMGB1P1psi-mi:“MI:0914”(association)0.350
BMI1MEIS3P1psi-mi:“MI:0914”(association)0.350
TECPR1PLOD3psi-mi:“MI:0914”(association)0.350
MAPTSHTN1psi-mi:“MI:0914”(association)0.350
DYRK1ATEX13Dpsi-mi:“MI:0914”(association)0.350
ACTR2psi-mi:“MI:0914”(association)0.350
ARL3TRAPPC13psi-mi:“MI:0914”(association)0.350
ARL8BARPC2psi-mi:“MI:0914”(association)0.350
KRASARPC1Bpsi-mi:“MI:0914”(association)0.350
TRAPPC11TRAPPC13psi-mi:“MI:0914”(association)0.350

BioGRID (126): TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-RNA), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Affinity Capture-MS), TRAPPC8 (Proximity Label-MS), TRAPPC8 (Proximity Label-MS)

ESM2 similar proteins: A0A0R4IES7, A0JN62, A0JNW5, A2AAE1, A2AGL3, A2RSJ4, A2RT67, A2RUS2, A2RV80, B0LPN4, B1H2P5, E7F240, E9Q401, O00507, O94967, P30957, P48553, P51593, Q14161, Q2LD37, Q3TLI0, Q3UHE1, Q3UVG3, Q3UX43, Q5F361, Q5M7Q1, Q5RAQ5, Q5ZJK1, Q658Y4, Q68CL5, Q6BDS2, Q6P6Y1, Q6TEP1, Q6VNB8, Q7TMY8, Q7TSG1, Q7Z6Z7, Q8BHY8, Q8CB44, Q8CGF6

SIGNOR signaling

2 interactions.

AEffectBMechanism
TRAPPC8“form complex”“TRAPP III complex, TRAPPC2 variant”binding
TRAPPC8“form complex”“TRAPP III complex, TRAPPC2B variant”binding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 57 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
COPII-mediated vesicle transport827.8×6e-08
RAB GEFs exchange GTP for GDP on RABs1026.4×1e-09
PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling510.3×4e-03
RHO GTPase Effectors710.1×6e-04
PIP3 activates AKT signaling68.5×4e-03
RAF/MAP kinase cascade67.8×4e-03
Signaling by Rho GTPases85.8×4e-03
Signaling by Rho GTPases, Miro GTPases and RHOBTB385.7×4e-03

GO biological processes:

GO termPartnersFoldFDR
obsolete vesicle tethering10198.3×2e-19
COPII vesicle coat assembly798.3×6e-11
peptidyl-tyrosine phosphorylation542.1×1e-05
endoplasmic reticulum to Golgi vesicle-mediated transport1232.6×3e-13
protein autophosphorylation617.4×1e-04

Disease & clinical

Clinical variants and AI predictions

ClinVar

234 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance182
Likely benign7
Benign3

Top pathogenic / likely-pathogenic (0)

SpliceAI

4917 predictions. Top by Δscore:

VariantEffectΔscore
18:31846816:GCCTA:Gacceptor_loss1.0000
18:31846818:C:Aacceptor_loss1.0000
18:31846819:T:Cacceptor_loss1.0000
18:31849599:A:ACdonor_gain1.0000
18:31849600:C:CCdonor_gain1.0000
18:31852436:A:ACdonor_gain1.0000
18:31852437:C:CCdonor_gain1.0000
18:31852502:CCG:Cacceptor_gain1.0000
18:31852503:CG:Cacceptor_gain1.0000
18:31852503:CGC:Cacceptor_gain1.0000
18:31852505:C:CCacceptor_gain1.0000
18:31852590:TTTA:Tdonor_loss1.0000
18:31852591:TTA:Tdonor_loss1.0000
18:31852592:TACCT:Tdonor_loss1.0000
18:31852593:A:AGdonor_loss1.0000
18:31852664:C:CCacceptor_gain1.0000
18:31853845:AAAC:Adonor_loss1.0000
18:31853846:AAC:Adonor_loss1.0000
18:31853848:C:Adonor_loss1.0000
18:31853885:T:TAdonor_gain1.0000
18:31853899:C:CTdonor_gain1.0000
18:31853900:T:TTdonor_gain1.0000
18:31853903:TTGA:Tdonor_gain1.0000
18:31853904:TGAT:Tdonor_gain1.0000
18:31853942:CACT:Cacceptor_gain1.0000
18:31853944:CT:Cacceptor_gain1.0000
18:31853946:C:CCacceptor_gain1.0000
18:31853946:CTGTC:Cacceptor_loss1.0000
18:31853947:T:Aacceptor_loss1.0000
18:31855654:A:ACdonor_gain1.0000

AlphaMissense

9452 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
18:31874574:G:TA620D1.000
18:31874602:A:GS611P1.000
18:31874607:C:GR609P1.000
18:31874610:C:TG608E1.000
18:31874611:C:AG608W1.000
18:31874611:C:GG608R1.000
18:31874611:C:TG608R1.000
18:31874627:G:CH602Q1.000
18:31874627:G:TH602Q1.000
18:31874628:T:GH602P1.000
18:31874629:G:CH602D1.000
18:31874645:C:AW596C1.000
18:31874645:C:GW596C1.000
18:31874647:A:GW596R1.000
18:31874647:A:TW596R1.000
18:31874688:C:GR582P1.000
18:31874695:C:GA580P1.000
18:31890754:C:GR570P1.000
18:31890760:C:AG568V1.000
18:31890760:C:TG568D1.000
18:31890761:C:GG568R1.000
18:31890764:C:GA567P1.000
18:31890766:A:GL566S1.000
18:31890769:A:CI565R1.000
18:31890769:A:TI565K1.000
18:31890776:G:CH563D1.000
18:31890777:A:CF562L1.000
18:31890777:A:TF562L1.000
18:31890778:A:GF562S1.000
18:31890779:A:GF562L1.000

dbSNP variants (sampled 300 via entrez): RS1000001596 (18:31834921 T>C), RS1000002891 (18:31910586 T>C), RS1000029841 (18:31920503 TATAAA>T), RS1000039731 (18:31928294 T>C), RS1000068587 (18:31836317 T>C,G), RS1000082757 (18:31889335 C>G), RS1000102158 (18:31848258 G>A), RS1000135549 (18:31864245 T>C), RS1000157752 (18:31840567 A>G), RS1000178256 (18:31942038 T>C), RS1000234168 (18:31873372 A>C,G), RS1000272813 (18:31901281 G>C), RS1000296736 (18:31906468 C>T), RS1000310050 (18:31847277 A>G), RS1000355743 (18:31930878 T>A)

Disease associations

OMIM: gene MIM:614136 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

0 associations (top):

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

26 total (human), top 26 by PubMed support.

ChemicalActions (top 5)PubMed papers
aristolochic acid Idecreases expression1
FR900359affects phosphorylation1
ginger extractdecreases expression, increases abundance1
dicrotophosdecreases expression1
bisphenol Adecreases expression1
arseniteaffects binding, decreases reaction1
sodium arseniteincreases expression1
cobaltous chlorideincreases expression1
butyraldehydedecreases expression1
perfluorooctane sulfonic aciddecreases expression1
K 7174increases expression1
jinfukangdecreases expression1
Resveratrolaffects cotreatment, increases expression1
Temozolomidedecreases expression1
Air Pollutantsdecreases expression, increases abundance1
Benzo(a)pyreneaffects methylation1
Cadmiumincreases abundance, increases expression1
Coumestroldecreases expression1
Ivermectindecreases expression1
Oils, Volatiledecreases expression, increases abundance1
Plant Extractsaffects cotreatment, increases expression1
Potassium Dichromatedecreases expression1
Seleniumdecreases expression1
Vitamin Edecreases expression1
Cadmium Chlorideincreases expression, increases abundance1
Particulate Matterdecreases expression, increases abundance1

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.