The clock gene period in the medfly Ceratitis capitata

Area of Science:

• Molecular Biology
• Chronobiology
• Insect Pest Management

Background:

• The clock gene period (per) is crucial for circadian rhythmicity in many organisms.
• Understanding the per gene in economically important insect pests like the medfly (Ceratitis capitata) is vital for pest control strategies.

Purpose of the Study:

• To isolate and characterize the period (per) gene from the medfly Ceratitis capitata.
• To investigate the expression patterns of the medfly per gene and its protein product.
• To assess the functional role of the medfly per gene in regulating behavioral rhythms.

Main Methods:

• Isolation of the period (per) gene from Ceratitis capitata.
• Analysis of per mRNA and PER protein expression in medfly heads under different light conditions.
• Transgenic expression of the Ceratitis per gene in Drosophila melanogaster per-null mutant flies.

Main Results:

• The Ceratitis per gene sequence shows conserved domains with other dipteran and lepidopteran per orthologues.
• Medfly per mRNA exhibited daily oscillations, but PER protein levels did not show significant cycling.
• Transgenic expression of Ceratitis per in Drosophila partially rescued behavioral rhythmicity, indicating species-specific regulatory information.

Conclusions:

• The medfly period (per) gene is conserved in its structural domains.
• Post-transcriptional or post-translational regulation likely affects PER protein cycling in Ceratitis capitata.
• The Ceratitis per gene contains species-specific elements influencing circadian behavior, offering potential targets for pest control.