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Sökning: WFRF:(Genel F)

  • Resultat 1-6 av 6
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  • van Schaarenburg, Rosanne A., et al. (författare)
  • Marked variability in clinical presentation and outcome of patients with C1q immunodeficiency
  • 2015
  • Ingår i: Journal of Autoimmunity. - : Elsevier. - 0896-8411 .- 1095-9157. ; 62, s. 39-44
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective: Globally approximately 60 cases of C1q deficiency have been described with a high prevalence of Systemic Lupus Erythematosus (SLE). So far treatment has been guided by the clinical presentation rather than the underlying C1q deficiency. Recently, it was shown that C1q production can be restored by allogeneic hematopoietic stem cell transplantation. Current literature lacks information on disease progression and quality of life of C1q deficient persons which is of major importance to guide clinicians taking care of patients with this rare disease.Methods: We performed an international survey, of clinicians treating C1q deficient patients. A high response rate of >70% of the contacted clinicians yielded information on 45 patients with C1q deficiency of which 25 are published.Results: Follow-up data of 45 patients from 31 families was obtained for a median of 11 years after diagnosis. Of these patients 36 (80%) suffer from SLE, of which 16 suffer from SLE and infections, 5 (11%) suffer from infections only and 4 (9%) have no symptoms. In total 9 (20%) of the C1q deficient individuals had died. All except for one died before the age of 20 years. Estimated survival times suggest 20% case-fatality before the age of 20, and at least 50% of patients are expected to reach their middle ages.Conclusion: Here we report the largest phenotypic data set on C1q deficiency to date, revealing high variance; with high mortality but also a subset of patients with an excellent prognosis. Management of C1q deficiency requires a personalized approach.
  • Schejbel, L, et al. (författare)
  • Molecular basis of hereditary C1q deficiency-revisited: identification of several novel disease-causing mutations
  • 2011
  • Ingår i: GENES AND IMMUNITY. - : Nature Publishing Group. - 1466-4879 .- 1476-5470. ; 12:8, s. 626-634
  • Tidskriftsartikel (refereegranskat)abstract
    • C1q is the central pattern-recognition molecule in the classical pathway of the complement system and is known to have a key role in the crossroads between adaptive and innate immunity. Hereditary C1q deficiency is a rare genetic condition strongly associated with systemic lupus erythematosus and increased susceptibility to bacterial infections. However, the clinical symptoms may vary. For long, the molecular basis of C1q deficiency was ascribed to only six different mutations. In the present report, we describe five new patients with C1q deficiency, present the 12 causative mutations described till now and review the clinical spectrum of symptoms found in patients with C1q deficiency. With the results presented here, confirmed C1q deficiency is reported in 64 patients from at least 38 families.
  • Gulez, N., et al. (författare)
  • Homozygosity For a Novel Mutation in the C1q C Chain Gene in a Turkish Family With Hereditary C1q Deficiency
  • 2010
  • Ingår i: Journal of Investigational Allergology & Clinical Immunology. - : Hogrefe & Huber Publishers. - 1698-0808. ; 20:3, s. 255-258
  • Tidskriftsartikel (refereegranskat)abstract
    • Hereditary complete deficiency of complement component C1q is associated with a high prevalence of systemic lupus erythematosus and increased susceptibility to severe recurrent infections. An 11-year-old girl was screened for immunodeficiency due to a history of recurrent meningitis and pneumonia. Immunologic studies revealed absence of classic pathway hemolytic activity and undetectable levels of C1q. Exon-specific amplification of genomic DNA by polymerase chain reaction followed by direct sequence analysis revealed a novel homozygous missense mutation at codon 48 in the C1q C gene causing a glycine-to-arginine substitution affecting the collagen-like region of C1q. No changes were seen in the exons of the A and B chains. The mutation affected both the formation and the secretion of C1q variant molecules. We describe a novel mutation in the C1q C chain gene that leads to an interchange in amino acids resulting in absence of C1q in serum.
  • Genel, F, et al. (författare)
  • Complement factor I deficiency associated with recurrent infections, vasculitis and immune complex glomerulonephritis
  • 2005
  • Ingår i: Scandinavian Journal of Infectious Diseases. - : Informa Healthcare. - 1651-1980. ; 37:8, s. 615-618
  • Tidskriftsartikel (refereegranskat)abstract
    • Here we report complement factor I deficiency in an 11-y-old girl from a consanguineous Turkish family, who presented with recurrent pyogenic infections, vasculitic eruptions and immune complex glomerulonephritis. A moderately low C3 level together with the clinical picture suggested a deficiency affecting regulation of complement activation. Analysis of haemolytic activity revealed absence of alternative pathway activity and subsequent analysis showed no detectable factor I (<2%) together with a low level of factor B and a moderately low level of factor H, indicating consumption secondary to the factor I deficiency. Factor I inhibits complement activation beyond C3 by cleavage of C3b in the presence of cofactors. Complement factor I deficiency is frequently associated with recurrent pyogenic infections mainly affecting the upper and lower respiratory tract, or presenting as meningitis or septicaemia, while rheumatic disorders have not been a prominent feature. The patient's sister also suffered from recurrent pyogenic infections and had a low C3 level clearly suggesting the same deficiency.
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  • Resultat 1-6 av 6

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