Two transcriptional cascades orchestrate cockroach leg regeneration

Area of Science:

• Developmental Biology
• Regenerative Medicine
• Molecular Biology

Background:

• Appendage regeneration is a complex biological process with unclear regulatory mechanisms.
• The American cockroach (Periplaneta americana) exhibits remarkable regeneration capacity, making it a valuable model organism.
• Understanding the molecular basis of regeneration can inform regenerative medicine strategies.

Purpose of the Study:

• To establish a transcriptional landscape of regenerating cockroach legs.
• To identify signaling pathways and transcription factors involved in leg regeneration.
• To elucidate the molecular mechanisms underlying blastema cell proliferation and morphogenesis.

Main Methods:

• Large-scale in vivo screening in Periplaneta americana.
• Transcriptional profiling of regenerating appendages.
• Analysis of key signaling pathways including BMP, JAK-STAT, and Notch.

Main Results:

• Identified two major transcriptional cascades: BMP/JAK-STAT-zfh-2-B-H2 and Notch-drm/bowl-bab1.
• Demonstrated that zfh-2 and bowl are critical for blastema cell proliferation and morphogenesis.
• Confirmed zfh-2 as a direct target of BMP signaling, promoting cell proliferation.

Conclusions:

• Two distinct transcriptional cascades orchestrate cockroach leg regeneration.
• These findings advance the understanding of molecular mechanisms in appendage regeneration.
• The identified pathways may be conserved in vertebrate appendage regeneration, suggesting evolutionary links.