crinkled reveals a new role for Wingless signaling in Drosophila denticle formation

Area of Science:

• Developmental Biology
• Genetics
• Cell Signaling

Background:

• Body plan specification in invertebrates and vertebrates relies on cell signaling pathways.
• Translating signaling output into morphogenesis remains a key research question.
• The Wingless (Wg) pathway is crucial for embryonic patterning.

Purpose of the Study:

• To investigate genetic interactions between the Wingless (Wg) signaling pathway and nonmuscle myosin heavy chain (crinkled; ck) in Drosophila.
• To understand how these interactions influence epidermal morphogenesis, specifically denticle formation.
• To elucidate the role of Ck in Wg-mediated epidermal patterning.

Main Methods:

• Genetic screens to identify mutations modifying wg loss-of-function phenotypes.
• Isolation and characterization of crinkled (ck) mutant alleles.
• Analysis of larval cuticle morphology in wild-type and mutant backgrounds.
• Examination of actin bundle structure during denticle formation.
• Investigating the regulation of Wg target genes, including shaven-baby (svb), miniature (m), and forked (f).

Main Results:

• Multiple independent alleles of crinkled (ck) were isolated in a screen for wg modifiers.
• ck mutations significantly altered denticle morphology in wg mutants but not in wild-type backgrounds.
• Changes in Wg activity levels affected actin bundle structure in denticles of ck mutants.
• Regulation of Wg targets svb, m, and f modulated the ck-dependent denticle shaping process.

Conclusions:

• Crinkled (Ck) functions in conjunction with Wingless (Wg) signaling targets to regulate denticle morphogenesis in the Drosophila embryonic epidermis.
• This interaction highlights a mechanism by which cell signaling is translated into specific morphological outcomes.
• The study provides insights into the genetic control of epidermal patterning and morphogenesis.