4.7 Article

Knockdown of the Drosophila FIG4 induces deficient locomotive behavior, shortening of motor neuron, axonal targeting aberration, reduction of life span and defects in eye development

Journal

EXPERIMENTAL NEUROLOGY
Volume 277, Issue -, Pages 86-95

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.expneurol.2015.12.011

Keywords

CMT4J; FIG4; Drosophila; Neuron; Eye

Categories

Funding

  1. JST
  2. JSPS
  3. Ministry of Education, Science, Sports and Culture of Japan
  4. Research Committee of Charcot Marie-Tooth Disease
  5. Ministry of Health, Labor and Welfare of Japan
  6. Grants-in-Aid for Scientific Research [15K09322, 221S0003, 26440097] Funding Source: KAKEN

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Mutations in Factor-Induced-Gene 4 (FIG4) gene have been identified in Charcot-Marie-Tooth disease type 4J (CMT4J), Yunis-Varon syndrome and epilepsy with polymicrogyria. FIG4 protein regulates a cellular abundance of phosphatidylinositol 3,5-bisphosphate (PI(3,5)P-2), a signaling lipid on the cytosolic surface of membranes of the late endosomal compartment. PI(3,5)P-2 is required for retrograde membrane trafficking from lysosomal and late endosomal compartments to the Golgi. However, it is still unknown how the neurodegeneration that occurs in these diseases is related to the loss of FIG4 function. Drosophila has CG17840 (dFIG4) as a human FIG4 homolog. Here we specifically knocked down dFIG4 in various tissues, and investigated their phenotypes. Neuron specific knockdown of dFIG4 resulted in axonal targeting aberrations of photoreceptor neurons, shortened presynaptic terminals of motor neurons in 3rd instar larvae and reduced climbing ability in adulthood and life span. Fat body-specific knockdown of dFIG4 resulted in enlarged lysosomes in cells that were detected by staining with LysoTracker. In addition, eye imaginal disk-specific knockdown of dFIG4 disrupted differentiation of pupal ommatidial cell types, such as cone cells and pigment cells, suggesting an additional role of dFIG4 during eye development. (C) 2015 Elsevier Inc. All rights reserved.

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