ENDOGLIN, A TGF-BETA BINDING-PROTEIN OF ENDOTHELIAL-CELLS, IS THE GENE FOR HEREDITARY HEMORRHAGIC TELANGIECTASIA TYPE-1

Hereditary haemorrhagic telangiectasia (HHT) is an autosomal dominant disorder characterized by multisystemic vascular dysplasia and recurre nt haemorrhage. Linkage for some families has been established to chro mosome 9q33-q34, In the present study, endoglin, a transforming growth factor beta (TGF-beta) binding protein, was analysed as a candidate g ene for the disorder based on chromosomal location, expression pattern and function, We have identified mutations in three affected individu als: a C to G substitution converting a tyrosine to a termination codo n, a 39 base pair deletion and a 2 basepair deletion which creates a p remature termination codon, We have identified endoglin as the HHT gen e mapping to 9q3 and have established HHT as the first human disease d efined by a mutation in a member of the TGF-beta receptor complex.