Glanzmann's thrombasthenia: Identification of 19 new mutations in 30 patients

Glanzmann's thrombasthenia (GT) is a genetically heterogeneous autosomal recessive syndrome associated with a bleeding tendency. To elucidate molecular basis of GT we have screened for mutations 30 GT patients, On the whole, 21 different candidate causal mutations, 17 in the alpha(llb) and 4 in the beta(3) gene have been found. Only two (alpha(IIb)Pro145Ala and IVS3(-3)-418del) have been previously reported. Nine mutations (42.9%) were likely to produce truncated proteins, whereas the remaining 12 were missense mutations that affected highly conserved residues in alpha(IIb) and beta(3) genes. Six mutations were found in different patients suggesting a possible founder effect. The wide spectrum of expressivity, ranging from mild to severe also among C. patients carrying the same mutations, provided evidence for a role of different loci or circumstantial factors. In conclusion, we have identified a spectrum of unreported mutations that may be of value to unravel the role of specific regions of alpha(IIb) and beta(3) genes.