Isolation and characterization of high quality DNA from marine benthic macroalgae

Area of Science:

• Molecular Biology
• Marine Botany
• Biotechnology

Background:

• High-quality DNA isolation is crucial for molecular biology techniques like PCR and restriction digestion.
• Algae are diverse organisms with potential applications, but efficient DNA extraction can be challenging.
• Previous methods may be costly or less effective for certain algal species or preservation states.

Purpose of the Study:

• To develop an easy, inexpensive protocol for genomic DNA extraction from various algae species.
• To assess the suitability of the extracted DNA for downstream molecular applications.
• To demonstrate the protocol's efficacy on both fresh and preserved algal samples.

Main Methods:

• Genomic DNA was extracted from seven algal species (Chlorophyceae, Rhodophyceae, Phaeophyceae) collected from the Sunderban delta.
• The quality of isolated DNA was assessed using spectrophotometry (A260/A280 ratio).
• Suitability for molecular techniques was confirmed through PCR amplification with random amplified polymorphic DNA (RAPD) primers and Eco RV restriction digestion.

Main Results:

• The protocol successfully isolated genomic DNA from all tested algal species, regardless of their growth substrate or preservation state.
• The A260/A280 ratios ranged from 1.15 ± 0.14 to 1.94, indicating minimal protein and polysaccharide contamination.
• Extracted DNA yielded successful PCR amplification with RAPD primers and was suitable for Eco RV restriction digestion.

Conclusions:

• A simple, affordable, and effective protocol for genomic DNA isolation from diverse algae has been established.
• The protocol yields DNA of sufficient quality for PCR-based and hybridization-based molecular techniques.
• This method supports molecular research on algae, including those from challenging environments or preserved collections.