The role of the fruitless P3 transcript in development in Drosophila melanogaster

Knocking down Drosophila melanogaster fruitless P3 transcripts significantly delays pupariation and causes complete pupal lethality, with deaths concentrated in early-to-mid pupal stages.

• Why it matters: Most non-sex-specific fruitless isoforms are poorly understood, and prior mutations could not separate P3 from other transcript classes that may affect developmental viability.
• What they did: The study used transcript-specific RNA interference with the Gal4/UAS system to reduce fru P3 expression and compared developmental timing and survival to pupariation and pupal stages.
• The result: P3 loss increased developmental time to pupariation and produced complete lethality during pupal development, but did not match fru null mutants, implying other fruitless transcript classes are needed earlier.

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