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[Recurrent meningitis in a familial defect of the beta-subunit of the 8th complement component]
W Nürnberger1, H Pietsch, P Kobler
1Kinderklinik B der Universität Düsseldorf.
Abstract:
Bacterial meningitides occurred in two members of a Yugoslavian family. In one case meningitis remained a singular event, Neisseria meningitidis being identified in the CSF. The second patient developed five episodes of recurrent purulent meningitis associated with petechiae and in one instance also with arthritis of the left knee but no causative germ was found. In both patients the Western blot technique revealed a defect of the beta-subunit of the eighth component of complement that was completely eliminated by purified C8. This proved that the C8 defect was isolated and that no other component was deficient.
Insights
Two family members experienced bacterial meningitis. A defect in the eighth component of complement (C8) was identified in both, explaining recurrent meningitis and susceptibility to infection.
Area of Science:
- Immunology
- Infectious Diseases
- Genetics
Background:
- Recurrent bacterial meningitis poses a significant clinical challenge.
- Complement system deficiencies are known to increase susceptibility to Neisseria infections.
Observation:
- Two individuals from the same family presented with bacterial meningitis.
- One patient experienced recurrent meningitis episodes, with petechiae and arthritis in one instance.
- Cerebrospinal fluid (CSF) analysis identified Neisseria meningitidis in one case, but no pathogen was found in the recurrent cases.
Findings:
- Western blot analysis revealed a defect in the beta-subunit of the eighth component of complement (C8) in both patients.
- The C8 defect was confirmed to be isolated, as it was corrected by purified C8.
- This isolated C8 deficiency was associated with recurrent purulent meningitis.
Implications:
- Isolated C8 deficiency is a risk factor for recurrent bacterial meningitis, particularly Neisseria meningitidis infections.
- Understanding complement deficiencies is crucial for diagnosing and managing recurrent infections.
- Genetic defects in complement components can lead to specific clinical syndromes, highlighting the interplay between immunity and genetics.