A guide for studying spatiotemporal variability in murine hair cycle and hair growth wave patterns in vivo

Area of Science:

• Dermatology
• Developmental Biology
• Epithelial Biology

Background:

• The murine hair cycle is a key model for epithelial-mesenchymal interactions.
• Previous studies lacked comprehensive temporal and anatomical scope.
• Understanding hair cycle variability is crucial for dermatological research.

Purpose of the Study:

• To develop a high-resolution, wholemount methodology for assessing hair follicle cycling dynamics.
• To uncover previously unrecognized variability in murine hair cycle patterns.
• To provide a guide for future dermatological studies in mice.

Main Methods:

• Development of a highly resolved, wholemount imaging approach.
• Analysis of hair follicle populations across different anatomical regions.
• Assessment of variability across individual animals, sexes, and age groups.

Main Results:

• Hair cycle dynamics exhibit greater inter-individual variability than previously appreciated.
• Spatiotemporal variability in telogen and anagen durations was observed.
• Significant differences in hair fiber length were found between body regions and timepoints.

Conclusions:

• Hair cycle dynamics in mice are complex and highly variable.
• This variability must be considered in future dermatological research.
• The findings inform studies on hair growth phenotypes, regeneration, and drug discovery.