Invasive Meningococcal Disease Unraveling a Novel Mutation in the C5 Gene in a Portuguese Family

Area of Science:

• Immunology
• Genetics
• Infectious Diseases

Background:

• Invasive meningococcal disease (IMD) is strongly linked to complement deficiencies.
• Congenital immunodeficiencies are rare causes of bacterial meningitis.

Observation:

• A patient from a consanguineous family presented with invasive meningococcal disease.
• The causative agent was identified as serogroup B meningococcus.

Findings:

• The patient was diagnosed with a C5 deficiency.
• A novel mutation in the C5 gene was identified as the cause of the deficiency.

Implications:

• This case highlights the importance of investigating complement pathways in patients with recurrent or severe invasive bacterial infections.
• Genetic analysis can reveal novel mutations underlying complement deficiencies, such as C5 deficiency.
• Understanding these genetic underpinnings is crucial for diagnosing and managing primary immunodeficiencies.