Next Generation Sequencing (NGS) Sample Submission
Successful Next Generation Sequencing (NGS) projects are built upon a foundation of high-quality sample preparation. The Sample Submission Form serves as the critical bridge between the researcher and the sequencing facility, ensuring that the laboratory staff understands the nature, quality, and specific requirements of the genetic material provided. Providing accurate information on this form is essential for project planning, library preparation, and data analysis success.
The Purpose of the Submission Form
The submission form acts as a standardized data entry point. It captures biological metadata, quantification metrics, and the experimental intent of the user. By requiring standardized inputs, the core facility can effectively triage samples, assign appropriate sequencing protocols, and troubleshoot potential issues before reagents are consumed or samples are processed.
Key Information Required
- Sample Identification: Unique identifiers for each sample are mandatory to ensure traceability throughout the bioinformatics pipeline.
- Biological Source: Documentation of species, tissue type, and extraction method helps the facility select the right library preparation kit (e.g., total RNA vs. mRNA enrichment).
- Quantification Metrics: Facilities generally require concentrations measured by fluorometric methods (like Qubit) rather than spectrophotometric methods (like NanoDrop), as the former are more specific to double-stranded DNA or RNA.
- Quality Assessment: Providing the Integrity Number (e.g., DIN for DNA or RIN for RNA) ensures that the sample is not overly degraded.
- Storage and Handling History: Information regarding freeze-thaw cycles or buffer composition (e.g., presence of EDTA or detergents) is vital, as certain chemicals can inhibit the enzymes used in library synthesis.
Preparation Best Practices
Before submitting the form, researchers must ensure their samples are prepared to the facilitys specifications. Common prerequisites include:
- Volume and Concentration: Facilities often require a specific minimum volume to account for dead space in automated liquid handlers and to allow for re-quantification.
- Buffer Compatibility: Samples should ideally be eluted in nuclease-free water or 10mM Tris-HCl (pH 8.0-8.5). High concentrations of salt, ethanol, or EDTA can compromise downstream enzymatic reactions.
- Contaminant Removal: Ensuring the total absence of phenol, chloroform, or genomic DNA contamination (in the case of RNA samples) is crucial.
Workflow Integration
Once the submission form is received, it is reviewed by a project manager or technician. If the quality metrics fall outside of the acceptable range, the facility will usually contact the researcher to discuss the risks of proceeding. This verification step is intended to maximize the likelihood of generating high-quality reads and to minimize wasted time and resources on samples that are unlikely to produce usable data.
Digital Submission and Tracking
Most modern facilities utilize web-based portals or electronic submission forms. These digital systems are preferred over paper documents as they reduce transcription errors and allow for immediate data validation. Digital forms often include automated checks that prevent a user from submitting a form if they have entered values outside of the permitted range, further streamlining the laboratory intake process.
Conclusion
The NGS sample submission form is more than just a bureaucratic requirement; it is a vital scientific document. By treating the submission process with the same level of care as the wet-bench experiment, researchers ensure that their samples are handled correctly, that the sequencing results are robust, and that the project timeline remains on track. Always consult the specific guidelines provided by your sequencing core, as requirements may vary depending on the platform used, such as Illumina, PacBio, or Oxford Nanopore technologies.
