Salivary RANKL and OPG gene expression quantification during intermaxillary elastic traction in orthodontic patients

Area of Science:

• Orthodontics
• Molecular Biology
• Genetics

Background:

• Orthodontic treatment involves mechanical forces that can induce molecular changes.
• Quantifying these changes non-invasively is crucial for understanding treatment responses.
• Saliva offers a promising source for molecular biomarker discovery.

Purpose of the Study:

• To present a detailed protocol for quantifying salivary RANKL and OPG gene expression.
• To assess gene expression changes in orthodontic patients undergoing different elastic traction therapies.
• To establish a reproducible workflow for molecular event investigation in orthodontics.

Main Methods:

• Non-invasive saliva collection via passive drooling at baseline, 24h, and 7 days.
• Column-based RNA extraction and cDNA synthesis from salivary pellets.
• Quantitative real-time PCR (RT-qPCR) for RANKL and OPG gene expression analysis using β-actin as reference.

Main Results:

• The protocol details steps for RNA extraction and RT-qPCR amplification.
• It includes spectrophotometric quality control and MIQE guidelines adherence.
• A prospective three-group design allows isolation of gene expression changes related to specific orthodontic mechanics.

Conclusions:

• This protocol provides a reproducible method for salivary gene expression analysis in orthodontics.
• It facilitates the study of mechanically induced molecular events during orthodontic treatment.
• The non-invasive approach enhances patient comfort and sample accessibility.