Developmental genetics of color pattern establishment in cats

Area of Science:

• Developmental biology
• Genetics
• Comparative morphology

Background:

• The Felidae family exhibits diverse and intricate color patterns, crucial for their morphological variation.
• Understanding the developmental basis of these patterns is key to explaining evolutionary diversification.

Purpose of the Study:

• To investigate the developmental timing, location, and mechanisms of felid color pattern establishment.
• To identify the molecular players involved in creating patterns like stripes and spots.

Main Methods:

• Morphological analysis of fetal cat skin.
• Single-cell gene expression profiling during embryonic development.
• Genetic analysis of coat pattern mutations.

Main Results:

• Early fetal development shows stripe-like epidermal thickness changes, guided by gene expression pre-patterns.
• The Dickkopf 4 gene, a secreted Wnt inhibitor, is crucial for pattern formation.
• Mutations in Dickkopf 4 correlate with the Ticked pattern type in cats.

Conclusions:

• This study provides molecular insights into the development of feline coat patterns, akin to leopard spots.
• The findings suggest shared developmental mechanisms between periodic color patterns and hair follicle spacing.
• Identified targets offer potential for understanding pattern variation across diverse mammal species.