Molecular Analysis of Hereditary Deficiency of the Third Component of Complement (C3) in Two Sisters

Wataru MATSUYAMA; Masanori NAKAGAWA; Hiroshi TAKASHIMA; Fuminaga MURANAGA; Yuji SANO; Mitsuhiro OSAME

doi:10.2169/internalmedicine.40.1254

Wataru MATSUYAMA, Masanori NAKAGAWA, Hiroshi TAKASHIMA, Fuminaga MURANAGA, Yuji SANO, Mitsuhiro OSAME

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Keywords: stop codon, systemic lupus erythematosus

JOURNAL FREE ACCESS

2001 Volume 40 Issue 12 Pages 1254-1258

DOI https://doi.org/10.2169/internalmedicine.40.1254

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Abstract

We report two sisters with hereditary deficiency of the third complement component (C3) and a homozygous mutation at C3303G (Tyr1081Stop) of the gene. They developed systemic lupus erythematosus-like symptoms during adolescence. Their C3 were not detected in serum immunochemically. Their mother and a brother had half of the normal C3 levels and a heterozygous mutation in the same position. Western blot analysis of murine L-cells transfected with the mutant C3 cDNA showed no C3 protein, however mRNA was detectable using reverse-transcriptase polymerase chain reaction. To the best of our knowledge, this is the first report of C3 deficiency due to a stop codon in the gene.
(Internal Medicine 40: 1254-1258, 2001)

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