ZFIN ID: ZDB-PUB-060412-3
Zebrafish fat-free is required for intestinal lipid absorption and Golgi apparatus structure
Ho, S.Y., Lorent, K., Pack, M., and Farber, S.A.
Date: 2006
Source: Cell Metabolism   3(4): 289-300 (Journal)
Registered Authors: Farber, Steven, Ho, Shiu-Ying, Lorent, Kristin, Pack, Michael
Keywords: none
MeSH Terms:
  • Amino Acid Sequence
  • Animals
  • Endosomes/physiology
  • Enterocytes/chemistry
  • Enterocytes/physiology
  • Fluorescent Antibody Technique
  • Gene Expression Regulation
  • Golgi Apparatus/chemistry
  • Golgi Apparatus/ultrastructure*
  • Humans
  • Intestinal Absorption*
  • Lipid Metabolism*
  • Male
  • Membrane Proteins/genetics
  • Membrane Proteins/physiology
  • Microscopy, Confocal
  • Molecular Sequence Data
  • Mutation
  • Phenotype
  • Protein Structure, Tertiary
  • Protein Transport
  • Recombinant Fusion Proteins/metabolism
  • Transport Vesicles
  • Vesicular Transport Proteins/chemistry
  • Vesicular Transport Proteins/genetics*
  • Vesicular Transport Proteins/physiology*
  • Zebrafish
  • Zebrafish Proteins/chemistry
  • Zebrafish Proteins/genetics*
  • Zebrafish Proteins/physiology*
PubMed: 16581006 Full text @ Cell Metab.
The zebrafish fat-free (ffr) mutation was identified in a physiological screen for genes that regulate lipid metabolism. ffr mutant larvae are morphologically indistinguishable from wild-type sibling larvae, but their absorption of fluorescent lipids is severely impaired. Through positional cloning, we have identified a causative mutation in a highly conserved and ubiquitously expressed gene within the ffr locus. The Ffr protein contains a Dor-1 like domain typical of oligomeric Golgi complex (COG) gene, cog8. Golgi complex ultrastructure is disrupted in the ffr digestive tract. Consistent with a possible role in COG-mediated Golgi function, wild-type Ffr-GFP and COG8-mRFP fusion proteins partially colocalize in zebrafish blastomeres. Enterocyte retention of an endosomal lipid marker in ffr larvae support the idea that altered vesicle trafficking contributes to the ffr mutant defect. These data indicate that ffr is required for both Golgi structure and vesicular trafficking, and ultimately lipid transport.