Chitinases and immunity: Ancestral molecules with new functions

Area of Science:

• Biochemistry
• Immunology
• Genetics

Background:

• Chitinases and Chitinase-like Proteins (C/CLPs) are ancient gene family members.
• Despite lacking endogenous chitin, humans express various C/CLPs.
• Active chitinases bind chitin via cysteine-rich domains, while CLPs bind chitin differently.

Purpose of the Study:

• To provide an overview of all chitinase family members.
• To elucidate C/CLP mechanisms and molecular interactions in immune response regulation.
• To explore their potential as diagnostic and prognostic markers.

Main Methods:

• Molecular phylogenetic analyses to understand evolutionary relationships.
• Review of existing studies on mammalian chitinase expression and function.
• Analysis of C/CLP roles in immune activities.

Main Results:

• Chitinases evolved from early gene duplication events.
• Further duplications and mutations led to the evolution of chi-lectins.
• Mammalian chitinases show differential expression in immune activities.

Conclusions:

• C/CLPs have crucial roles in bacterial infections and inflammatory diseases.
• Their functions extend beyond chitin hydrolysis.
• C/CLPs show promise as diagnostic and prognostic markers for diseases.