Laboratory Facility Overview¶

Background¶

The physical laboratory facility is a critical factor in molecular diagnostic accuracy. SENO's 3,000 m² purpose-built facility in Zhangjiakou, Hebei Province, was designed specifically for avian genetic testing workflows. The facility layout enforces strict physical separation of pre- and post-PCR processes — a fundamental requirement for preventing amplicon contamination that can produce false-positive results.

The total capital investment exceeds USD 1,000,000, covering clean-room construction, instrumentation, and environmental control systems. The facility is designed to ISO 14644 clean-room standards and supports concurrent processing of DNA sexing, disease qPCR, and pigeon genetic testing without workflow interference.

Location & Environment¶

SENO's laboratory is located in Zhangjiakou, Hebei Province — 160 km northwest of Beijing. The region's high-altitude (1,000 m) cool climate provides an ideal environment for bio-testing operations, reducing ambient temperature fluctuations and minimizing contamination risks during molecular analysis.

Facility Specifications¶

Major Instrumentation¶

Instrument Calibration & Maintenance¶

Clean Laboratory Design¶

The facility features a multi-zone clean room design:

1. General Access Zone — Sample receiving, documentation, administrative areas
2. Buffer Zone — Gowning, air shower, material transfer
3. Class 10,000 Clean Lab — Sample processing, nucleic acid extraction, PCR setup
4. Class 1,000 Ultra-Clean Lab — Reagent preparation, master mix formulation, high-sensitivity assays
5. Post-PCR Analysis Area — Amplification, detection, capillary electrophoresis (physically separated from pre-PCR areas)

Zone Access & Airflow¶

Contamination Control¶

• Unidirectional workflow: Personnel and materials move from clean → dirty direction only; no backtracking from post-PCR to pre-PCR zones
• Physical separation: Pre- and post-PCR areas are in separate rooms with dedicated HVAC systems — no air recirculation between zones
• HEPA filtration: All clean zones have HEPA-filtered supply air; post-PCR areas have HEPA-filtered exhaust
• Regular environmental monitoring: Airborne particle counts, surface swab cultures, and PCR test for amplicon contamination on all work surfaces — performed weekly
• UV sterilization cycles: Between processing batches, all pre-PCR work surfaces are exposed to UV-C (254 nm, ≥ 40 µW/cm²) for minimum 15 minutes
• Dedicated equipment per zone: No pipettes, centrifuges, or consumables cross between pre- and post-PCR zones (color-coded by zone)

Sample Workflow Through the Facility¶

Sample Receipt → Registration → Accessioning → DNA/RNA Extraction
                                                    ↓
                                           PCR/qPCR Setup
                                                    ↓
                                           Amplification (Post-PCR)
                                                    ↓
                                           Fragment/Gel Analysis
                                                    ↓
                                           Result Interpretation
                                                    ↓
                                           Report Generation

Each arrow represents a physical transfer between zones, with samples moving from General Access → Class 10,000 → Class 1,000 (if needed) → Post-PCR. The unidirectional flow ensures that once amplified DNA is present (post-PCR), it cannot physically return to pre-PCR areas.

Facility Capacity¶

Cross-References¶

• Team & Expertise — Staff operating the facility
• Lab Workflow — Detailed step-by-step testing process
• DNA Extraction SOP — Standard operating procedure for nucleic acid extraction
• Laboratory QC Protocols — Quality monitoring of the clean-room environment
• Sample Storage & Stability — Sample preservation in −80°C freezers

Frequently Asked Questions¶

Q: Why is physical separation of pre- and post-PCR areas important? A: PCR amplification produces millions of copies of target DNA per reaction. If even a few molecules of amplified DNA (amplicons) enter a pre-PCR area, they can serve as templates for subsequent PCRs, causing false-positive results. Physical separation — with dedicated HVAC, equipment, and personnel flow — is the gold standard for preventing this.

Q: How is the clean-room environment monitored? A: Weekly environmental monitoring includes: (1) airborne particle counts at critical locations, (2) surface swab cultures for microbial growth, and (3) PCR-based amplicon detection on pre-PCR work surfaces. Results are recorded in the QC tracking database.

Q: What happens if environmental monitoring detects contamination? A: Any positive surface swab triggers immediate investigation and decontamination. The affected zone is closed for sample processing, deep-cleaned with 10% bleach and UV-C sterilization, and re-tested (two consecutive negative results) before resuming operations.

Q: Can the facility scale to handle increased testing volume? A: Yes. The facility operates below 70% of its theoretical maximum capacity in routine conditions, allowing surge capacity for seasonal demand spikes (e.g., pre-breeding season in February–April) without compromising quality.

Last updated: August 2026