Hereditary complement factor I deficiency

TJ Vyse, PJ Spath, KA Davies, Bernard J Morley, P Philippe, P Athanassiou, CM Giles, MJ Walport

Research output: Contribution to journalArticle

Abstract

We describe four cases (from three families) of hereditary factor I deficiency, bringing the total number of cases now reported to 23. In one family there are two affected siblings: one has suffered recurrent pyogenic infections; the other is asymptomatic. In the second family, the patient had recurrent pyogenic infections and a self-limiting vasculitic illness; in the third family, the patient suffered recurrent pyogenic and neisserial infections. All four patients had markedly reduced concentrations of C3 in the serum (family 1 propositus: 28%; family 1 asymptomatic sibling: 15%; family 2: 31%; and family 3: 31% normal human serum) which was in the form of C3b. Low IgG2 levels may occur in primary C3 deficiency, and a reduction in IgG2 concentration to 1.14 g/l (normal: 1.30-5.90 g/l) was found in the patient from family 2. Using radioligand binding assays, we demonstrated increased binding of C3b to erythrocytes in a patient with factor I deficiency. This C3b could not be cleaved by autologous serum but could be cleaved by normal serum or purified factor I. We review and compare the published cases of C3, factor H and factor I deficiency.
Original languageEnglish
Pages (from-to)385-401
Number of pages17
JournalQJM: An International Journal of Medicine
Volume87
Publication statusPublished - Jul 1994

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Serum
Siblings
Immunoglobulin G
Infection
Complement Factor H
Complement Factor I Deficiency
Radioligand Assay
Erythrocytes

Cite this

Vyse, TJ., Spath, PJ., Davies, KA., Morley, B. J., Philippe, P., Athanassiou, P., ... Walport, MJ. (1994). Hereditary complement factor I deficiency. QJM: An International Journal of Medicine, 87, 385-401.

Hereditary complement factor I deficiency. / Vyse, TJ; Spath, PJ; Davies, KA; Morley, Bernard J; Philippe, P; Athanassiou, P; Giles, CM; Walport, MJ.

In: QJM: An International Journal of Medicine, Vol. 87, 07.1994, p. 385-401.

Research output: Contribution to journalArticle

Vyse, TJ, Spath, PJ, Davies, KA, Morley, BJ, Philippe, P, Athanassiou, P, Giles, CM & Walport, MJ 1994, 'Hereditary complement factor I deficiency', QJM: An International Journal of Medicine, vol. 87, pp. 385-401.
Vyse TJ, Spath PJ, Davies KA, Morley BJ, Philippe P, Athanassiou P et al. Hereditary complement factor I deficiency. QJM: An International Journal of Medicine. 1994 Jul;87:385-401.
Vyse, TJ ; Spath, PJ ; Davies, KA ; Morley, Bernard J ; Philippe, P ; Athanassiou, P ; Giles, CM ; Walport, MJ. / Hereditary complement factor I deficiency. In: QJM: An International Journal of Medicine. 1994 ; Vol. 87. pp. 385-401.
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AU - Davies, KA

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AU - Giles, CM

AU - Walport, MJ

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N2 - We describe four cases (from three families) of hereditary factor I deficiency, bringing the total number of cases now reported to 23. In one family there are two affected siblings: one has suffered recurrent pyogenic infections; the other is asymptomatic. In the second family, the patient had recurrent pyogenic infections and a self-limiting vasculitic illness; in the third family, the patient suffered recurrent pyogenic and neisserial infections. All four patients had markedly reduced concentrations of C3 in the serum (family 1 propositus: 28%; family 1 asymptomatic sibling: 15%; family 2: 31%; and family 3: 31% normal human serum) which was in the form of C3b. Low IgG2 levels may occur in primary C3 deficiency, and a reduction in IgG2 concentration to 1.14 g/l (normal: 1.30-5.90 g/l) was found in the patient from family 2. Using radioligand binding assays, we demonstrated increased binding of C3b to erythrocytes in a patient with factor I deficiency. This C3b could not be cleaved by autologous serum but could be cleaved by normal serum or purified factor I. We review and compare the published cases of C3, factor H and factor I deficiency.

AB - We describe four cases (from three families) of hereditary factor I deficiency, bringing the total number of cases now reported to 23. In one family there are two affected siblings: one has suffered recurrent pyogenic infections; the other is asymptomatic. In the second family, the patient had recurrent pyogenic infections and a self-limiting vasculitic illness; in the third family, the patient suffered recurrent pyogenic and neisserial infections. All four patients had markedly reduced concentrations of C3 in the serum (family 1 propositus: 28%; family 1 asymptomatic sibling: 15%; family 2: 31%; and family 3: 31% normal human serum) which was in the form of C3b. Low IgG2 levels may occur in primary C3 deficiency, and a reduction in IgG2 concentration to 1.14 g/l (normal: 1.30-5.90 g/l) was found in the patient from family 2. Using radioligand binding assays, we demonstrated increased binding of C3b to erythrocytes in a patient with factor I deficiency. This C3b could not be cleaved by autologous serum but could be cleaved by normal serum or purified factor I. We review and compare the published cases of C3, factor H and factor I deficiency.

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