Robust DNA Isolation and High-throughput Sequencing Library Construction for Herbarium Specimens
March 8th, 2018
10.4K views
This article demonstrates a detailed protocol for DNA isolation and high-throughput sequencing library construction from herbarium material including rescue of exceptionally poor-quality DNA.
Overview
This article demonstrates a detailed protocol for DNA isolation and high-throughput sequencing library construction from herbarium material. The method enhances the utility of degraded herbarium specimens in phylogenomic studies.
Key Study Components
Area of Science
- Genomics
- Phylogenetics
- Botanical Research
Background
- Herbarium specimens often contain degraded DNA.
- Traditional methods may not be suitable for these samples.
- High-throughput sequencing can benefit from improved DNA isolation techniques.
- This protocol aims to utilize historical collections effectively.
Purpose of Study
- To increase the quantity of isolated double-stranded DNA.
- To construct high-throughput sequencing libraries from herbarium specimens.
- To maximize the utility of degraded samples in genomic studies.
Methods Used
- Add liquid nitrogen and sterilized sand to grind herbarium tissue.
- Use a pre-chilled mortar and pestle for sample preparation.
- Follow a detailed protocol for DNA isolation.
- Construct sequencing libraries suitable for high-throughput analysis.
Main Results
- Successful isolation of DNA from historically significant specimens.
- Demonstrated robustness of the protocol for degraded samples.
- Extended taxon sampling in systematic studies.
- Facilitated the inclusion of historical collections in genomic research.
Conclusions
- The protocol enhances the feasibility of using herbarium specimens in sequencing projects.
- It opens new avenues for phylogenomic research.
- Rare specimens can be utilized without extensive destructive sampling.
Frequently Asked Questions
What is the main advantage of this protocol?
The protocol allows for the use of degraded herbarium specimens without extensive destructive sampling.
How does this method benefit phylogenomic studies?
It increases the quantity of usable DNA from historical collections, enhancing taxon sampling.
What materials are needed for the grinding process?
Liquid nitrogen and sterilized sand are required to grind the herbarium tissue.
Can this protocol be applied to all herbarium specimens?
It is particularly designed for specimens with poor-quality DNA.
What is the significance of using historical collections?
Historical collections provide valuable genetic information that can be used in modern studies.
Executive Industry Relevance
Unlocking robust DNA isolation and high-throughput sequencing from herbarium specimens addresses a critical bottleneck in plant genomics and phylogenetic discovery. This protocol enables the inclusion of rare, degraded, or irreplaceable samples in large-scale sequencing projects, expanding taxonomic breadth and reducing destructive sampling. The approach supports scalable, reproducible workflows essential for enterprise-level R&D and portfolio expansion in plant biotechnology.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of genetic diversity from historical and rare plant specimens.
- Supports functional validation of phylogenetic targets using previously inaccessible material.
- Facilitates predictive confidence in lineage assignment and evolutionary studies.
Screening & Assay Development
- Prepares validated DNA libraries suitable for high-throughput sequencing platforms.
- Standardizes sample processing across diverse, low-quality plant materials.
- Delivers reproducible, quantitative DNA yields for downstream comparative analyses.
Translational & Preclinical Research
- Enables continuity from discovery genomics to translational phylogenetic applications.
- Supports risk-adjusted advancement of plant-derived targets for further study.
- Provides a foundation for biomarker discovery in plant systematics when applicable.
Pipeline & Workflow Integration
This protocol integrates at the interface of sample acquisition and sequencing library preparation, bridging early discovery with downstream genomic analysis.
- Discovery Biology: Expands hypothesis testing to include rare and degraded specimens, increasing biological de-risking.
- Screening: Delivers assay-ready DNA libraries with consistent fragment sizes and yields.
- Analytics: Provides quantitative DNA and library quality metrics for cross-sample comparison.
- Translational Research: Maintains continuity for phylogenetic and evolutionary studies using historical samples.
- Enterprise Reuse: Establishes a scalable, adaptable workflow for diverse plant lineages and future projects.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence and reduces ambiguity in plant target validation.
- Operational Value: Standardizes DNA isolation and library construction for high-throughput scalability.
- Strategic Value: Enables informed go/no-go decisions for rare sample utilization and portfolio expansion.
- Portfolio Impact: Supports risk-adjusted prioritization of plant targets and maximizes use of historical collections.
Implementation Considerations
- Requires expertise in plant molecular biology and sequencing library preparation.
- Needs access to standard molecular biology instrumentation and high-throughput sequencing infrastructure.
- Demands cross-team standardization for reproducibility across diverse sample types.
- May require adaptation for plant lineages with extreme DNA degradation or inhibitory metabolites.
- Limited by DNA fragment size distribution and presence of secondary metabolites in some specimens.
Biopharma FAQs
Why does null hypothesis testing matter for DNA yield validation?
Null hypothesis testing ensures that observed DNA yields from herbarium specimens are statistically significant compared to negative controls, supporting confidence in sample suitability for sequencing projects.
How does independent variable isolation improve library construction workflows?
Isolating variables such as tissue grinding and reamplification steps allows teams to optimize each stage, minimizing confounding factors and enhancing reproducibility across diverse plant samples.
What do quantitative dependent variable measurements enable in this protocol?
Quantitative measurements of DNA concentration and library fragment size enable objective assessment of sample quality, guiding downstream sequencing decisions and cross-sample comparisons.
Why are replication requirements critical for cross-functional collaboration?
Replication ensures that DNA isolation and library construction results are consistent across operators and batches, facilitating reliable data sharing and integration in multi-team projects.
What statistical analysis capabilities are required before sequencing implementation?
Teams must be able to analyze DNA yield distributions, fragment size profiles, and sequencing library quality metrics to validate protocol performance and inform go/no-go decisions for sequencing investment.
Chapters in this video
0:04
Title
0:58
DNA Extraction
4:39
DNA Shearing
5:28
Bead Clean-up
7:06
Library Preparation
7:40
Adaptor Ligation
8:46
PCR Amplification
9:12
Size Selection for Desired Library Size and Quality Control
11:04
Results: Isolation and High-throughput Sequencing of Poor Quality DNA Isolated from Various Herbarium Species
12:33
Conclusion
