Analysis of P transposable element functions in Drosophila

Area of Science:

• Molecular Biology
• Genetics
• Drosophila melanogaster research

Background:

• P elements are transposable genetic elements in Drosophila.
• Understanding P element function is crucial for genetic research and manipulation.

Purpose of the Study:

• To characterize a new P element derivative, Pc[ry], for its autonomous transposition and ability to mobilize other P elements.
• To identify the functional domains of the P element transposase.

Main Methods:

• Construction and characterization of the Pc[ry] P element derivative.
• Introduction of frameshift mutations into P element open reading frames.
• Complementation tests with mutant P elements.
• Analysis of P element transcripts.

Main Results:

• Pc[ry] exhibits autonomous transposition into Drosophila germline chromosomes.
• Pc[ry] successfully mobilizes defective P elements in trans.
• Frameshift mutations in P element open reading frames eliminate transposase activity but not cis-acting signals.
• Complementation data suggest a single polypeptide constitutes the transposase.
• Two RNA species specific to autonomous P elements were identified.

Conclusions:

• The Pc[ry] derivative is a functional, autonomous P element useful for genetic studies.
• The P element transposase is likely a single polypeptide.
• Specific RNA species are associated with autonomous P element activity.