Evolutionarily conserved gene family important for fat storage

Proc Natl Acad Sci U S A. 2008 Jan 8;105(1):94-9. doi: 10.1073/pnas.0708579105. Epub 2007 Dec 26.


The ability to store fat in the form of cytoplasmic triglyceride droplets is conserved from Saccharomyces cerevisiae to humans. Although much is known regarding the composition and catabolism of lipid droplets, the molecular components necessary for the biogenesis of lipid droplets have remained obscure. Here we report the characterization of a conserved gene family important for lipid droplet formation named fat-inducing transcript (FIT). FIT1 and FIT2 are endoplasmic reticulum resident membrane proteins that induce lipid droplet accumulation in cell culture and when expressed in mouse liver. shRNA silencing of FIT2 in 3T3-LI adipocytes prevents accumulation of lipid droplets, and depletion of FIT2 in zebrafish blocks diet-induced accumulation of lipid droplets in the intestine and liver, highlighting an important role for FIT2 in lipid droplet formation in vivo. Together these studies identify and characterize a conserved gene family that is important in the fundamental process of storing fat.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • 3T3-L1 Cells / metabolism
  • Adipocytes / metabolism
  • Adipose Tissue / physiology*
  • Amino Acid Sequence
  • Animals
  • Conserved Sequence
  • Diabetes Mellitus, Experimental / metabolism
  • Evolution, Molecular*
  • Gene Expression Regulation*
  • Humans
  • Lipids / chemistry
  • Liver / metabolism*
  • Membrane Proteins / chemistry
  • Membrane Proteins / physiology*
  • Mice
  • Models, Biological
  • Molecular Sequence Data
  • Sequence Homology, Amino Acid
  • Triglycerides / chemistry
  • Triglycerides / metabolism
  • Zebrafish


  • FIT2 protein, mouse
  • FITM2 protein, human
  • Fitm1 protein, mouse
  • Lipids
  • Membrane Proteins
  • Triglycerides

Associated data

  • GEO/GSM136099
  • GEO/GSM136100