High-quality total RNA extraction from early-stage lamprey embryos

Area of Science:

• Developmental Biology
• Genomics
• Evolutionary Biology

Background:

• Lampreys and hagfish are extant jawless vertebrates (cyclostomes), vital for evolutionary developmental biology (EvoDevo) research.
• High-purity total RNA extraction from early-stage embryos is critical for transcriptome analyses.
• Existing RNA extraction methods face challenges with low RNA yield and purity from early embryos, particularly concerning RNA binding to silica membranes and contamination during precipitation.

Purpose of the Study:

• To develop an optimized protocol for high-purity total RNA extraction from early-stage lamprey embryos.
• To address the limitations of current RNA extraction techniques in yielding sufficient quantity and quality of RNA from these specific model organisms.

Main Methods:

• Modification of a standard RNA extraction protocol.
• Inclusion of precentrifugation steps.
• Addition of salts prior to isopropanol precipitation.

Main Results:

• The modified protocol significantly increased RNA yield compared to standard methods.
• Contaminants were effectively removed, leading to improved RNA purity (higher OD 260/280 ratio).
• RNA integrity was enhanced, making it suitable for downstream transcriptome analyses.

Conclusions:

• The optimized RNA extraction protocol effectively overcomes previous technical hurdles in processing early-stage lamprey embryos.
• This improved method provides a reliable means to obtain high-quality RNA for advanced genomic studies in cyclostomes.
• Egg membrane components are implicated as a source of contamination, with extraction quality improving in posthatching embryos.