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. 1994 Sep 27;91(20):9622–9625. doi: 10.1073/pnas.91.20.9622

A cluster of mutations within a short triplet repeat in the C1 inhibitor gene.

J J Bissler 1, M Cicardi 1, V H Donaldson 1, P A Gatenby 1, F S Rosen 1, A L Sheffer 1, A E Davis 3rd 1
PMCID: PMC44865  PMID: 7937817

Abstract

Mutations in the C1 inhibitor gene that result in low functional levels of C1 inhibitor protein cause hereditary angioneurotic edema. This disease is characterized by episodic edema leading to considerable morbidity and death. Among 60 unreported kindred with the disease, four patients were discovered to have mutations clustered within a 12-bp segment of exon 5 from nucleotide 8449 to nucleotide 8460. This short segment of DNA contains three direct repeats of the triplet CAA and is immediately preceded by a similar adenosine-rich sequence (CAAGAACAC). These triplet repeats make this region susceptible to mutation by a slipped mispairing mechanism. There are two other short triplet repeat elements in the coding region for this gene, but they have not become mutated in any kindred examined. This suggests that the apparent enhanced mutation rate in this region of exon 5 may be influenced by DNA structural characteristics.

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Selected References

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