DREF is required for efficient growth and cell cycle progression in Drosophila imaginal discs

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• The transcription factor DNA replication-related element factor (DREF) has been implicated in regulating growth and replication in Drosophila melanogaster based on overexpression studies.
• Its precise role in these processes, particularly in loss-of-function scenarios, remained to be fully elucidated.

Purpose of the Study:

• To investigate the contribution of DREF to cell cycle progression, organ growth, and associated gene regulation in Drosophila melanogaster using loss-of-function experiments.
• To determine if DREF acts as a global regulator of transcriptional programs controlling proliferation and development.

Main Methods:

• RNA interference (RNAi) was employed to achieve DREF extinction in vivo.
• Analysis of cell cycle progression, imaginal disc growth, and gene expression patterns was conducted.
• Experiments involving suppressed apoptosis were performed to assess the effect of DREF activation on organ overgrowth.

Main Results:

• Loss-of-function of DREF impairs normal cell cycle progression, leading to reduced growth of imaginal discs and adult organs.
• DREF regulates the expression of genes critical for the S phase transition in imaginal disc cells.
• Under conditions of suppressed apoptosis, DREF activation results in overgrowth of developing organs.

Conclusions:

• DREF is indispensable for normal cell cycle progression and organ growth in Drosophila.
• DREF controls key transcriptional programs essential for cell proliferation and development.
• These findings establish DREF as a critical global regulator in animal development.