High-quality RNA extraction from copepods for Next Generation Sequencing: A comparative study.

Area of Science:

• Marine Biology
• Molecular Biology
• Genomics

Background:

• Copepods are ecologically vital marine crustaceans.
• Limited Next-Generation Sequencing (NGS) studies exist for copepods due to a lack of standardized RNA extraction protocols.
• High-quality RNA is crucial for gene expression studies using high-throughput applications.

Purpose of the Study:

• To compare the efficacy of three RNA extraction methods (TRIzol®, Aurum Total RNA Mini Kit, Qiagen RNeasy Micro Kit) combined with two preservation reagents (TRIzol®, RNAlater®).
• To determine the optimal protocol for obtaining high-quality and quantity RNA from copepods for NGS.
• To investigate unique RNA properties in copepods.

Main Methods:

• RNA extraction from three copepod species: Calanus helgolandicus, Centropages typicus, and Temora stylifera.
• Evaluation of RNA quantity and quality using NanoDrop, agarose gel electrophoresis, and Agilent Bioanalyzer.
• Comparison of TRIzol®, Aurum Total RNA Mini Kit, and Qiagen RNeasy Micro Kit with TRIzol® and RNAlater® preservation.

Main Results:

• Preservation in RNAlater® combined with the Qiagen RNeasy Micro Kit yielded the highest quality and quantity of RNA for Calanus helgolandicus.
• A unique characteristic of Calanus helgolandicus 28S rRNA was observed, separating into two subunits upon heat-denaturation.
• This 28S rRNA property has not been previously reported in copepods.

Conclusions:

• The combination of RNAlater® preservation and Qiagen RNeasy Micro Kit extraction is recommended for NGS studies on Calanus helgolandicus.
• This study provides a standardized approach to improve gene expression analysis in copepods.
• The discovery of unique rRNA properties in copepods opens new avenues for molecular research.