Origin and Evolution of the Multifaceted Adherens Junction Component Plekha7

Area of Science:

• Evolutionary biology
• Molecular genetics
• Cell biology

Background:

• Plekha7 is a crucial adherens junction protein in mammalian cells.
• The PLEKHA protein family has eight members with varied functions.
• The evolutionary path of Plekha7 has not been previously explored.

Purpose of the Study:

• To investigate the evolutionary history and gene origins of Plekha7 and its paralogs.
• To classify Plekha proteins into distinct subfamilies based on evolutionary relationships.
• To understand the duplication events that shaped the PLEKHA4/5/6/7 subfamily.

Main Methods:

• Phylogenetic analysis of Plekha genes across different species.
• Sequence analysis to identify conserved domains and similarities.
• Exon-intron organization and syntenic analyses to trace gene evolution.
• Comparative genomics to understand gene duplication events.

Main Results:

• Plekha7, Plekha4, Plekha5, and Plekha6 form a distinct subfamily (PLEKHA4/5/6/7).
• This subfamily originated from a single gene in invertebrates, with duplications occurring in vertebrates.
• Vertebrate PLEKHA4/5/6/7 proteins possess unique intrinsically disordered domains not found in invertebrates.
• Gene duplication events align with the 1R/2R hypothesis of genome evolution.

Conclusions:

• The study elucidates the evolutionary origins of Plekha7 and the PLEKHA4/5/6/7 subfamily.
• Identified distinct evolutionary trajectories for Plekha subfamilies.
• Provides foundational insights for future functional studies on Plekha proteins.