A genetic pathway composed of Sox14 and Mical governs severing of dendrites during pruning.
Pruning that selectively eliminates neuronal processes is crucial for the refinement of neural circuits during development. In Drosophila, the class IV dendritic arborization neuron (ddaC) undergoes pruning to remove its larval dendrites during metamorphosis. We identified Sox14 as a transcription factor that was necessary and sufficient to mediate dendrite severing during pruning in response to ecdysone signaling. We found that Sox14 mediated dendrite pruning by directly regulating the expression of the target gene mical. mical Encodes a large cytosolic protein with multiple domains that are known to associate with cytoskeletal components. mical Mutants had marked severing defects during dendrite pruning that were similar to those of sox14 mutants. Overexpression of Mical could significantly rescue pruning defects in sox14 mutants, suggesting that Mical is a major downstream target of Sox14 during pruning. Thus, our findings indicate that a previously unknown pathway composed of Sox14 and its cytoskeletal target Mical governs dendrite severing.
Kirilly
Daniel
D
Temasek Life Sciences Laboratory, National University of Singapore, Singapore.
Gu
Ying
Y
Huang
Yafen
Y
Wu
Zhuhao
Z
Bashirullah
Arash
A
Low
Boon Chuan
BC
Kolodkin
Alex L
AL
Wang
Hongyan
H
Yu
Fengwei
F
D000818:Animals; D003599:Cytoskeleton / Q000502:physiology; D003600:Cytosol / Q000502:physiology; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D003712:Dendrites / Q000502:physiology*; D004330:Drosophila / Q000235:genetics* / Q000254:growth & development; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism; D004440:Ecdysone / Q000502:physiology; D018507:Gene Expression Regulation, Developmental; D008675:Metamorphosis, Biological / Q000502:physiology; D024521:Mushroom Bodies / Q000166:cytology / Q000254:growth & development / Q000502:physiology; D016296:Mutagenesis / Q000502:physiology; D009474:Neurons / Q000502:physiology / Q000648:ultrastructure; D011987:Receptors, Steroid / Q000235:genetics / Q000378:metabolism; D055749:SOXB2 Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic / Q000502:physiology
D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; C496247:MICAL protein, Drosophila; D011987:Receptors, Steroid; D055749:SOXB2 Transcription Factors; C492174:Sox14 protein, Drosophila; D014157:Transcription Factors; C066030:USP protein, Drosophila; C055469:ecdysone receptor; D004440:Ecdysone