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Human Molecular Genetics, Vol 8, 2325-2333, Copyright © 1999 by Oxford University Press

ARTICLES

Mutations in the gene encoding KRIT1, a Krev-1/rap1a binding protein, cause cerebral cavernous malformations (CCM1)

T Sahoo, EW Johnson, JW Thomas, PM Kuehl, TL Jones, CG Dokken, JW Touchman, CJ Gallione, SQ Lee-Lin, B Kosofsky, JH Kurth, DN Louis, G Mettler, L Morrison, A Gil-Nagel, SS Rich, JM Zabramski, MS Boguski, ED Green and DA Marchuk
Department of Genetics, Duke University Medical Center, Durham, NC 27710, USA,

Cerebral cavernous malformations (CCM) are congenital vascular anomalies of the brain that can cause significant neurological disabilities, including intractable seizures and hemorrhagic stroke. One locus for autosomal dominant CCM ( CCM1 ) maps to chromosome 7q21- q22. Recombination events in linked family members define a critical region of ~2 Mb and a shared disease haplotype associated with a presumed founder effect in families of Mexican-American descent points to a potentially smaller region of interest. Using a genomic sequence- based positional cloning strategy, we have identified KRIT1, encoding a protein that interacts with the Krev-1/rap1a tumor suppressor, as the CCM1 gene. Seven different KRIT1 mutations have been identified in 23 distinct CCM1 families. The identical mutation is present in 16 of 21 Mexican-American families analyzed, substantiating a founder effect in this population. Other Mexican-American and non-Hispanic Caucasian CCM1 kindreds harbor other KRIT1 mutations. Identification of a common Mexican-American mutation has potential clinical significance for presymptomatic diagnosis of CCM in this population. In addition, these data point to a key role for the Krev-1/rap1a signaling pathway in angiogenesis and cerebrovascular disease.
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