GBF1

golgi brefeldin A resistant guanine nucleotide exchange factor 1

Gene Function

Guanine-nucleotide exchange factor (GEF) for members of the Arf family of small GTPases involved in trafficking in the early secretory pathway; its GEF activity initiates the coating of nascent vesicles via the localized generation of activated ARFs through replacement of GDP with GTP. Recruitment to cis-Golgi membranes requires membrane association of Arf-GDP and can be regulated by ARF1, ARF3, ARF4 and ARF5. Involved in the recruitment of the COPI coat complex to the endoplasmic reticulum exit sites (ERES), and the endoplasmic reticulum-Golgi intermediate (ERGIC) and cis-Golgi compartments which implicates ARF1 activation. Involved in COPI vesicle-dependent retrograde transport from the ERGIC and cis-Golgi compartments to the endoplasmic reticulum (ER). Involved in the trans-Golgi network recruitment of GGA1, GGA2, GGA3, BIG1, BIG2, and the AP-1 adaptor protein complex related to chlathrin-dependent transport; the function requires its GEF activity (probably at least in part on ARF4 and ARF5). Has GEF activity towards ARF1. Has in vitro GEF activity towards ARF5 (By similarity). Involved in the processing of PSAP. Required for the assembly of the Golgi apparatus. The AMPK-phosphorylated form is involved in Golgi disassembly during mitotis and under stress conditions. May be involved in the COPI vesicle-dependent recruitment of PNPLA2 to lipid droplets; however, this function is under debate. In neutrophils, involved in G protein-coupled receptor (GPCR)-mediated chemotaxis und superoxide production. Proposed to be recruited by phosphatidylinositol-phosphates generated upon GPCR stimulation to the leading edge where it recruits and activates ARF1, and is involved in recruitment of GIT2 and the NADPH oxidase complex. Plays a role in maintaining mitochondrial morphology Source: UniProt

Relationship to CMT

CMT2 AD
1 subtype
10q24.32
First described 2020

Subtype Inheritance Class OMIM Sentinel Publication
SubtypeCMT2GG Inheritanceautosomal dominant ClassCMT2 OMIM606483 Sentinel Publication

2020 · 10.1016/j.ajhg.2020.08.018

Stored Identifiers

HGNC Aliases: KIAA0248, ARF1GEF
hgnc_idHGNC:4181
ensembl_gene_idENSG00000107862
coords_grch38chr10:102245371-102382899
coords_grch37chr10:104005289-104142656
entrez_id8729
omim_gene603698
uniprot_idsQ92538
refseq_accessionNM_001199378
mane_refseqNM_001377137.1
mane_ensemblENST00000369983.5

ClinVar Variants

Pathogenic and likely pathogenic variants in GBF1, as classified in ClinVar, are read live from NCBI. Only aggregate germline records are shown. Uncertain and conflicting classifications are not. Experts in CMT makes no claim to the accuracy of ClinVar data. This index is provided for informational purposes only.

Review stars are ClinVar’s measure of how well a classification is supported: four for a practice guideline, three for an expert panel review, two for agreement among multiple submitters, one for a single submitter with criteria provided, and none where no criteria were provided.

Reported in CMT
Reported in Other Diseases

Reported in a disease other than CMT. Listed apart rather than counted as CMT variants.

Variants w/o a Recorded Disease

Pathogenic or likely pathogenic in ClinVar, submitted without a disease recorded.

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