Establishment and characterization of a genomic DNA reference material for Group B Streptococcus detection

Area of Science:

• Microbiology
• Molecular Diagnostics
• Biotechnology

Background:

• Group B Streptococcus (GBS) poses significant risks for maternal and neonatal health.
• Accurate GBS detection is crucial for effective clinical management.
• Molecular assays require reliable reference standards for validation.

Purpose of the Study:

• To develop and certify a DNA reference material (RM) for Group B Streptococcus.
• To assess the performance of commercial GBS detection kits using the developed RM.
• To enhance the accuracy and reliability of GBS nucleic acid detection.

Main Methods:

• Genomic DNA extraction from GBS reference strain ATCC® 13813™.
• Quantification of the GBS DNA RM using droplet digital PCR (ddPCR).
• Multi-center collaborative study for RM certification and stability testing.
• Evaluation of commercial GBS detection kits' analytical performance.

Main Results:

• A stable and homogeneous GBS DNA RM was successfully developed.
• The certified value of the RM was determined as (7.53 ± 0.48) × 10³ copies/μL.
• Commercial GBS kits failed to consistently meet their claimed limits of detection.
• Clinical validation confirmed the RM's suitability for diagnostic applications.

Conclusions:

• The developed GBS DNA RM serves as a critical tool for validating molecular diagnostic assays.
• The RM identified performance limitations in commercial GBS detection kits.
• Implementing this RM can improve the accuracy of GBS nucleic acid testing, reducing misdiagnosis and improving patient outcomes.