Localized JNK signaling regulates organ size during development
Helen Rankin Willsey1, Xiaoyan Zheng2, José Carlos Pastor-Pareja1
1Department of Genetics, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, United States.
Elife
|March 15, 2016
Summary
Drosophila wing size is controlled by a stripe of JNK signaling, which inhibits the Hippo pathway. This discovery offers new insights into developmental biology and potential cancer therapies.
Area of Science:
- Developmental Biology
- Cell Signaling
- Cancer Biology
Background:
- Organ size determination is a fundamental biological question.
- Intrinsic size control mechanisms within organs are not fully understood.
- Previous research indicated organ size is influenced by internal factors.
Purpose of the Study:
- To investigate the intrinsic mechanisms regulating organ size in Drosophila.
- To identify signaling pathways involved in controlling Drosophila wing size.
- To explore the link between developmental signaling and potential cancer mechanisms.
Main Methods:
- Utilized Drosophila melanogaster as a model organism.
- Manipulated Jun-N-terminal kinase (JNK) signaling in developing wings.
- Investigated the interaction between JNK, Hedgehog, and Hippo pathways.
- Examined gene expression, including dTRAF1 and TRAF4.
Main Results:
- Localized JNK signaling in a central stripe regulates Drosophila wing size.
- JNK signaling inhibits the Hippo pathway in a Jun-independent manner.
- Hedgehog signaling establishes localized JNK activity via Ci-mediated dTRAF1 expression.
- Modulating JNK signaling in antennae and legs also altered their sizes.
Conclusions:
- JNK signaling is a key intrinsic regulator of organ size during development.
- The Hedgehog-JNK-Hippo pathway axis provides a novel mechanism for organ size control.
- Findings suggest TRAF4's role in cancer may be linked to Hedgehog pathway activity.
- This research opens new avenues for cancer therapy strategies.
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