Abstract
Purpose
Complement regulators control the activated complement system. Defects in this homeostasis can result in tissue damage and autoimmune diseases with a heterogeneity in clinical presentation. Complement factor I (FI), a serine protease, is an important regulator of alternative pathway activation. We report a diagnostic work-up of a patient with relapsing inflammatory mediated meningo-encephalitis. Our work-up revealed a rare genetic factor I (FI) deficiency. So far, all cases of reported complete factor I deficiency have absent serum levels of FI. We present here a unique case of a complete factor I deficiency based on a functional FI defect.
Methods
Complement assays and measurement of FI activity were performed in the patient, her family, factor H-deficient patients, a patient with C3-nephritic factor and 11 healthy controls. Genetic sequencing of the FI coding regions in the patient and her parents was performed.
Results
The patient had absent alternative pathway activity with low levels of C3 and normal serum level of FI. The patient’s plasma FI did not degrade C3b, with normalisation of C3b degradation after adding purified FI. Mutation analysis of the complement factor I gene revealed two heterozygous mutations (I322T and D506V).
Conclusion
To our knowledge, this paper describes a complete FI deficiency caused by a defect of FI activity for the first time. Normal FI concentration does not exclude a complete FI defect, additional functional analysis of FI is required in any patient with a defect of complement activation. Recurrent aseptic meningo-encephalitis is a rare clinical presentation of complete FI deficiency.
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Abbreviations
- AP50:
-
Alternative pathway activity
- aHUS:
-
Atypical haemolytic uremic syndrome
- CSF:
-
Cerebrospinal fluid
- CH50:
-
Classical pathway activity
- C1:
-
Complement factor 1
- C3:
-
Complement factor 3
- C4BP:
-
Complement factor 4 binding protein
- CR1:
-
Complement receptor 1
- FB:
-
Complement factor B
- FBb:
-
Complement factor Bb
- FD:
-
Complement factor D
- FDG-PET scan:
-
FluoroDeoxyGlucose-Position Emission Tomography
- FI:
-
Complement factor I
- FIMAC:
-
Factor I membrane attack complex
- FH:
-
Complement factor H
- iC3b:
-
Inactivated C3b
- LDLr-1 and 2:
-
Low-density lipoprotein receptor 1 and 2 domains
- MAC:
-
Membrane attack complex
- MBL:
-
Mannose binding lectin
- MCP:
-
Membrane cofactor protein
- MRI:
-
Magnetic Resonance Imaging
- PCR:
-
Polymerase chain reaction
- PE:
-
plasma exchange
- SP:
-
Serine protease domain
- sSRBC:
-
Sensitized sheep red blood cells
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Acknowledgments
We thank Prof. Dr. Françoise Mascart (Immunobiology Laboratory, Erasme Hospital, Université Libre de Bruxelles, Belgium) for her support for the complement assays and Dr. Van den Kar and Dr. Van den Heuvel (Nijmegen, the Netherlands) for the MCP and FH gene sequencing. We also thank Ilse Coomans for the technical support.
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Haerynck, F., Stordeur, P., Vandewalle, J. et al. Complete Factor I Deficiency Due to Dysfunctional Factor I with Recurrent Aseptic Meningo-Encephalitis. J Clin Immunol 33, 1293–1301 (2013). https://doi.org/10.1007/s10875-013-9944-8
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DOI: https://doi.org/10.1007/s10875-013-9944-8