Low frequency vibrations disrupt left-right patterning in the Xenopus embryo

Area of Science:

• Developmental Biology
• Organogenesis
• Biophysics

Background:

• Establishing consistent left-right (LR) asymmetry is crucial for organ development across diverse species.
• Previous studies faced challenges in precisely controlling the timing of molecular perturbations to understand LR asymmetry.
• Acoustical vibration offers a novel method for temporally controlled disruption of developmental processes.

Purpose of the Study:

• To investigate the effects of acoustical vibration on left-right (LR) patterning in Xenopus embryos.
• To identify specific developmental periods sensitive to vibratory disruption.
• To elucidate the molecular pathways affected by vibration during LR axis determination.

Main Methods:

• Xenopus embryos were exposed to low-frequency acoustical vibrations during specific developmental windows.
• The resulting randomization of internal organ positioning (heterotaxia) was quantified.
• Comparative analysis with known LR pathway inhibitors (e.g., nocodazole) was performed.

Main Results:

• Exposure to specific low frequencies induced significant heterotaxia in Xenopus embryos.
• Two distinct sensitive periods to vibration were identified, affecting distinct LR patterning mechanisms.
• The first period involved disruption of the nocodazole-sensitive LR pathway, while the second impacted the epithelial barrier integrity.

Conclusions:

• Low frequency vibrations provide a tool to dissect the temporal requirements of LR patterning.
• Vibration disrupts early LR patterning by interfering with LR axis orientation and signal amplification/restriction.
• These findings offer new perspectives on the biophysical regulation of organ asymmetry.