Forced lipophagy reveals that lipid droplets are required for early embryonic development in mouse

Takayuki Tatsumi, Kaori Takayama, Shunsuke Ishii, Atsushi Yamamoto, Taichi Hara, Naojiro Minami, Naoyuki Miyasaka, Toshiro Kubota, Akira Matsuura, Eisuke Itakura*, Satoshi Tsukamoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Although autophagy is classically viewed as a non-selective degradation system, recent studies have revealed that various forms of selective autophagy also play crucial physiological roles. However, the induction of selective autophagy is not well understood. In this study, we established a forced selective autophagy system using a fusion of an autophagy adaptor and a substrate-binding protein. In both mammalian cells and fertilized mouse embryos, efficient forced lipophagy was induced by expression of a fusion of p62 (Sqstm1) and a lipid droplet (LD)-binding domain. In mouse embryos, induction of forced lipophagy caused a reduction in LD size and number, and decreased the triglyceride level throughout embryonic development, resulting in developmental retardation. Furthermore, lipophagy-induced embryos could eliminate excess LDs and were tolerant of lipotoxicity. Thus, by inducing forced lipophagy, expression of the p62 fusion protein generated LDdepleted cells, revealing an unexpected role of LD during preimplantation development.

Original languageEnglish
Article numberdev161893
JournalDevelopment (Cambridge)
Issue number4
Publication statusPublished - 2018 Feb


  • Autophagy
  • Embryo
  • Lipid droplet
  • Mouse
  • Oocyte

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology


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