Comparative transcriptomic analysis and structure prediction of novel Newt proteins

Area of Science:

• Regenerative biology
• Molecular biology
• Biochemistry

Background:

• The Red-spotted Newt (Notophthalmus viridescens) exhibits remarkable regenerative capabilities.
• A novel family of five secretory proteins was previously identified in adult newt tissues during regeneration.
• These proteins possess a putative signal peptide, indicating their secretory nature.

Purpose of the Study:

• To generate 3D structures and predict the functions of these novel newt proteins using I-TASSER.
• To investigate the functional roles of these proteins by examining their effects on gene expression in a heterologous system.
• To validate RNA sequencing data using quantitative real-time PCR (RT-qPCR).

Main Methods:

• Iterative Threading Assembly Refinement (I-TASSER) server for protein structure prediction.
• Generation of transgenic Drosophila melanogaster to misexpress the five identified newt genes.
• RNA sequencing to compare transcript expression profiles between transgenic and control flies.
• Real-time quantitative Polymerase Chain Reaction (RT-qPCR) for gene expression validation.

Main Results:

• Predicted functions suggest these novel proteins may act as ion transporters and participate in redox reactions.
• Misexpression of newt genes in Drosophila melanogaster led to significant enrichment of transcripts involved in developmental processes, cell cycle, apoptosis, and immune response.
• RT-qPCR validated the RNA sequencing data for six highly regulated genes.

Conclusions:

• The identified novel protein family in Notophthalmus viridescens plays a role in regulating key cellular processes, including development, cell cycle, apoptosis, and immunity.
• These findings provide insights into the function of these secretory proteins and establish a foundation for future research in newt regeneration.
• The use of transgenic Drosophila melanogaster serves as a viable model for studying the function of genes from species lacking established transgenic approaches.