Comprehensive biodiversity analysis via ultra-deep patterned flow cell technology: a case study of eDNA metabarcoding...

Area of Science:

• Environmental DNA (eDNA) metabarcoding
• Marine ecology
• Biodiversity assessment

Background:

• Biodiversity characterization is vital for ecological studies and environmental monitoring.
• Environmental DNA (eDNA) metabarcoding is increasingly used for biodiversity assessment from environmental samples.
• The Illumina MiSeq is a popular platform, but its capacity for detecting rare organisms is questioned.

Purpose of the Study:

• To compare the biodiversity detection capabilities of Illumina MiSeq and NovaSeq platforms using eDNA metabarcoding.
• To assess if typical sequencing depths are sufficient for detecting rare or endangered species.
• To evaluate the impact of sequencing depth and platform technology on biodiversity data richness.

Main Methods:

• Collected seawater samples from Conception Bay, Newfoundland.
• Analyzed samples using Illumina MiSeq at 100,000 reads/sample and NovaSeq at 7 million reads/sample.
• Performed depth-for-depth comparisons and re-analyzed MiSeq data at 1 million reads/sample.

Main Results:

• NovaSeq detected significantly more taxa than MiSeq, even at equivalent sequencing depths.
• NovaSeq identified 40% more metazoan families, including marine mammals and bony fish.
• MiSeq performance plateaued at 1 million reads, while NovaSeq continued to detect new sequence variants.

Conclusions:

• The NovaSeq platform offers superior DNA sequence diversity detection compared to MiSeq for eDNA metabarcoding.
• Technological advancements in NovaSeq, like patterned flow cells, enhance biodiversity detection accuracy.
• NovaSeq has significant implications for comprehensive oceanic sample analysis in ecological and environmental research.