Evolutionary Aspects of TRPMLs and TPCs.

Area of Science:

• Cell Biology
• Molecular Biology
• Evolutionary Biology

Background:

• Transient receptor potential (TRP) channels are a diverse family of cation channels, with 28 members in mammals.
• Most TRP channels are in the plasma membrane, except mucolipins (TRPMLs) in the endo-lysosomal system.
• TRPMLs and two-pore cation channels (TPCs) are crucial for endo-lysosomal functions like trafficking, pH regulation, and autophagy.

Purpose of the Study:

• To investigate the evolutionary history of TRP/TRPML channels and TPCs.
• To identify the presence and functions of these channels in various species.
• To compare the functions of TRP/TRPMLs and TPCs across species with their mammalian orthologs.

Main Methods:

• Comparative genomics analysis of TRP/TRPML channels and TPCs across different species.
• Functional analysis of channel roles in non-mammalian organisms.
• Phylogenetic reconstruction to understand evolutionary relationships.

Main Results:

• TRP/TRPML channels and TPCs are found in a wide range of species, indicating ancient origins.
• Orthologs of these channels exhibit conserved functions in endo-lysosomal processes across diverse taxa.
• Evolutionary analysis reveals independent but functionally convergent pathways for these channel families.

Conclusions:

• TRPMLs and TPCs have distinct evolutionary trajectories despite overlapping functions in endo-lysosomal biology.
• Understanding the evolution of these channels provides insights into the fundamental mechanisms of cellular transport and homeostasis.
• Comparative studies are essential for deciphering the functional diversification and conservation of ion channels.