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nspA gene as a specific genetic marker for detection of Neisseria meningitidis causing bacterial meningitis

Neha Bhatt, Nazneen Khan, Sandip K Dash

    Indian Journal of Biochemistry & Biophysics
    |September 11, 2014
    PubMed

    Insights

    A new, rapid PCR test detects Neisseria meningitidis, a cause of bacterial meningitis, in 80 minutes. This method amplifies the nspA gene for quick and sensitive diagnosis from patient cerebrospinal fluid.

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Infectious Diseases

    Background:

    • Bacterial meningitis, particularly Neisseria meningitidis, poses a significant threat to human health, causing brain meninges damage.
    • Current diagnostic methods like microscopy, immunoassays, and conventional PCR are often time-consuming, expensive, or lack confirmatory power.

    Purpose of the Study:

    • To develop a rapid and sensitive Polymerase Chain Reaction (PCR) based method for the detection of Neisseria meningitidis.
    • To establish a novel genetic marker for the timely confirmation of bacterial meningitis.

    Main Methods:

    • Development of specific primers targeting the Neisseria surface protein A (nspA) gene.
    • Amplification of a partial nspA gene sequence (202 bp) for use as a genetic marker.
    • Evaluation of sensitivity, detection limits, and cross-reactivity with other pathogens using patient samples.

    Main Results:

    • The developed PCR method achieved high sensitivity in detecting as low as 10 ng of N. meningitidis genomic DNA within 80 minutes.
    • The method demonstrated a lower detection limit of 1.0 ng genomic DNA, albeit with reduced sensitivity.
    • Cross-reactivity studies confirmed the specificity of the nspA genetic marker for N. meningitidis.

    Conclusions:

    • The rapid PCR method offers a significantly faster diagnostic turnaround time (80 minutes) compared to existing techniques.
    • The nspA gene serves as a reliable genetic marker for the sensitive and specific detection of N. meningitidis.
    • This approach holds potential for improved and timely diagnosis of bacterial meningitis in clinical settings.

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