Regulation of cellular fat storage and mobilization

Our laboratory uses the nematode C. elegans as a discovery tool to elucidate the genetic pathways and molecular mechanisms that regulate food intake, fat storage and mobilization. We seek to address the following questions: (1) what are the regulatory mechanisms that govern lipid droplet size; (2) how do lipid droplets physically and functionally couple with other intracellular organelles; (3) what are the mechanisms for protein targeting and retention to lipid droplets? Most of our studies begin with large-scale forward genetic screens in C. elegans. We then employ genetics, lipid and protein biochemistry, high-throughput sequencing technology, fluorescence and electron microscopy to address our questions at a molecular level in C. elegans and mammalian models.

Our team

Principle Investigator

  • Ho Yi MAK

Technician

  • Frances CHAN

Postdoctoral Fellow

  • Zhe CAO (2019- )

Graduate Students

  • Lidan ZENG (2016- )
  • Yan LI (2016- )
  • Kin Yung CHAU  (2018- )
  • Chun Wing FUNG (2018- )
  • Phuong Linh LE (2018- )
  • Xingyu YANG (2018- )
  • Siwei Huang (2019-)

Undergraduate student

  • Pang Sum CHIU
  • Man Yung NG
  • Chung Hin SHOW

Publications

Cao Z, Hao Y, Fung CW, Lee YY, Wang P, Li X, Xie K, Lam WJ, Qiu Y, Tang BZ, Shui G, Liu P, Qu J, Kang B-H, Mak HY*. Dietary fatty acids promote lipid droplet diversity through seipin enrichment in an ER subdomain. Nature Communications. (2019) 10:2902.  doi: 10.1038/s41467-019-10835-4.

Li X, Li Y, Jiang M, Wu W, He S, Chen C, Qin Z, Tang BZ, Mak HY*, Qu JY*. Quantitative Imaging of Lipid Synthesis and Lipolysis Dynamics in Caenorhabditis elegans by Stimulated Raman Scattering Microscopy. Anal Chem. 2019 Feb 5;91(3):2279-2287. doi: 10.1021/acs.analchem.8b04875.

Li X, Lam WJ, Cao Z, Hao Y, Sun Q, He S, Mak HY*, Qu JY*. Integrated femtosecond stimulated Raman scattering and two-photon fluorescence imaging of subcellular lipid and vesicular structures. J Biomed Opt. 2015 Nov;20(11):110501. doi:10.1117/1.JBO.20.11.110501.

Na H, Zhang P, Chen Y, Zhu X, Liu Y, Liu Y, Xie K, Xu N, Yang F, Yu Y, Cichello S, Mak HY, Wang MC, Zhang H, Liu P. Identification of lipid droplet structure-like/resident proteins in Caenorhabditis elegans. Biochim Biophys Acta. 2015 Oct;1853(10 Pt A):2481-91.

Yang H, Vallandingham J, Shiu P, Li H, Hunter CP, Mak HY*. The DEAD Box Helicase RDE-12 Promotes Amplification of RNAi in Cytoplasmic Foci in C. elegans. Curr Biol. 2014; 24(8):832-8.

Krajniak J, Hao Y, Mak HY, Lu H. C.L.I.P.–continuous live imaging platform for direct observation of C. elegans physiological processes. Lab Chip. 2013 Aug 7;13(15):2963-71.

Klemm RW, Norton JP, Cole RA, Li CS, Park SH, Crane MM, Li L, Jin D, Boye-Doe A, Liu TY, Shibata Y, Lu H, Rapoport TA, Farese RV Jr, Blackstone C, Guo Y*, Mak HY*. A conserved role for atlastin GTPases in regulating lipid droplet size. Cell Rep. 2013 May 30;3(5):1465-75.

Xu N, Zhang SO, Cole RA, McKinney SA, Guo F, Haas JT, Bobba S, Farese RV Jr, Mak HY*. The FATP1-DGAT2 complex facilitates lipid droplet expansion at the ER-lipid droplet interface. J Cell Biol. 2012 Aug 27;198(5):895-911.

Yang H, Zhang Y, Vallandingham J, Li H, Florens L, Mak HY*. The RDE-10/RDE-11 complex triggers RNAi-induced mRNA degradation by association with target mRNA in C. elegans. Genes Dev. 2012 Apr 15;26(8):846-56.

Hao Y, Xu N, Box AC, Schaefer L, Kannan K, Zhang Y, Florens L, Seidel C, Washburn MP, Wiegraebe W, Mak HY*. Nuclear cGMP-dependent kinase regulates gene expression via activity-dependent recruitment of a conserved histone deacetylase complex. PLoS Genet. 2011 May;7(5):e1002065.

Zhang SO, Trimble R, Guo F, Mak HY*. Lipid droplets as ubiquitous fat storage organelles in C. elegans. BMC Cell Biol. 2010 Dec 8;11:96.

Zhang SO, Box AC, Xu N, Le Men J, Yu J, Guo F, Trimble R, Mak HY*. Genetic and dietary regulation of lipid droplet expansion in Caenorhabditis elegans. Proc Natl Acad Sci U S A. 2010 Mar 9;107(10):4640-5.

Butcher RA, Ragains JR, Li W, Ruvkun G, Clardy J, Mak HY*. Biosynthesis of the Caenorhabditis elegans dauer pheromone. Proc Natl Acad Sci U S A. 2009 Feb 10;106(6):1875-9.