4.0 Article

Drosophila DOCK Family Protein Sponge Regulates the JNK Pathway during Thorax Development

Journal

CELL STRUCTURE AND FUNCTION
Volume 39, Issue 2, Pages 113-124

Publisher

JAPAN SOC CELL BIOLOGY
DOI: 10.1247/csf.14008

Keywords

Sponge; DOCK; JNK; Rac1; Drosophila

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Funding

  1. Ministry of Education, Culture, Sports, Science and Technology of Japan
  2. JST
  3. JSPS

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The dedicator of cytokinesis (DOCK) family proteins that are conserved in a wide variety of species are known as DOCK1-DOCK11 in mammals. The Sponge (Spg) is a Drosophila counterpart to the mammalian DOCK3. Specific knockdown of spg by pannir-GAL4 or apterous-GAL4 driver in wing discs induced split thorax phenotype in adults. Reduction of the Drosophila c-Jun N-terminal kinase (JNK), basket (bsk) gene dose enhanced the spg knockdown-induced phenotype. Conversely, overexpression of bsk suppressed the split thorax phenotype. Monitoring JNK activity in the wing imaginal discs by immunostaining with anti-phosphorylated JNK (anti-pJNK) antibody together with examination of lacZ expression in a puckered-lacZ enhancer trap line revealed the strong reduction of the JNK activity in the spg knockdown clones. This was further confirmed by Western immunoblot analysis of extracts from wing discs of spg knockdown fly with anti-pJNK antibody. Furthermore, the Duolink in situ Proximity Ligation Assay method detected interaction signals between Spg and Rac1 in the wing discs. Taken together, these results indicate Spg positively regulates JNK pathway that is required for thorax development and the regulation is mediated by interaction with Rac1.

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