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- Gulez, N., et al.
(författare)
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Homozygosity For a Novel Mutation in the C1q C Chain Gene in a Turkish Family With Hereditary C1q Deficiency
- 2010
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Ingår i: Journal of Investigational Allergology & Clinical Immunology. - 1698-0808. ; 20:3, s. 255-258
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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.
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- Schejbel, L, et al.
(författare)
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Molecular basis of hereditary C1q deficiency-revisited: identification of several novel disease-causing mutations
- 2011
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Ingår i: GENES AND IMMUNITY. - : Springer Science and Business Media LLC. - 1466-4879 .- 1476-5470. ; 12:8, s. 626-634
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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.
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