Periostin shows increased evolutionary plasticity in its alternatively spliced region

Area of Science:

• Evolutionary biology
• Molecular biology
• Genomics

Background:

• Periostin (POSTN) is an extracellular matrix protein implicated in development and cancer.
• Its C-terminal region undergoes alternative splicing and lacks known protein domains.
• Differential POSTN expression and splicing are observed in various human cancers.

Purpose of the Study:

• To investigate the evolutionary history of periostin, focusing on its C-terminal region.
• To understand the functional implications of variations in POSTN's C-terminus.

Main Methods:

• Comparative analysis of genomic and transcriptomic data from vertebrate organisms.
• Examination of exon count, length, and splicing patterns of POSTN.

Main Results:

• The C-terminal region of POSTN exhibits high variability in exon count, length, and splicing across vertebrates.
• Identified conserved 13-amino acid repeat units in teleost fish, predicted to form beta strands.
• These beta strands may facilitate protein-protein interactions via a beta-zipper mechanism.

Conclusions:

• The C-terminal region of POSTN demonstrates significant evolutionary plasticity.
• These findings suggest a basis for POSTN's functional roles, potentially linked to its interaction capabilities.