# Optogenetic perturbation of lipid droplet localization affects lipid metabolism and development in Drosophila

## TL;DR

This paper shows that controlling where lipid droplets are located in cells using light can impact lipid metabolism and development in fruit flies.

## Contribution

The study introduces optogenetic tools to manipulate lipid droplet localization and reveals its functional significance.

## Key findings

- Light-induced relocation of lipid droplets increases VLDL secretion in hepatocytes.
- Proper lipid droplet localization is essential for successful embryonic development in Drosophila.

## Abstract

Lipid droplets (LDs) are dynamic organelles crucial for lipid storage and homeostasis. Despite extensive documentation of their importance, the causal relationship between LD localization and function in health and disease remains inadequately understood. Here, we developed optogenetics-based tools, termed “Opto-LDs,” which facilitate the interaction between LDs and motor proteins in a light-dependent manner, enabling precise control of LD localization within cells. Utilizing these optogenetic modules, we demonstrated that light-induced relocation of LDs to the periphery of hepatocytes results in elevated very-low-density lipoprotein (VLDL) secretion, recapturing the beneficial effect of insulin in vitro. Furthermore, our studies in transgenic Drosophila revealed that proper LD localization is critical for embryonic development, with mistargeting of LDs significantly affecting egg hatching success. In summary, our work underscores the great importance of LD localization in lipid metabolism and development, and our developed tools offer valuable insights into the functions of LDs in health and disease.