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F Bernardi, G Marchetti, P Patracchini, S Volinia, D Gemmati, P Simioni and A Girolami
Centro Studi Biochimici Patologie del Genoma Umano, Universita di Ferrara,
Italy.
The presence of gene lesions in coagulation factor X (FX, Stuart factor)
was investigated in patients with FX deficiency or an FX abnormality (FX
Friuli). The proposita had a heterozygous partial deletion of the FX gene
with severe deficiency of FX activity and antigen. The lesion, which was
inherited from her mother, removes the 3' portion of the gene coding for
the catalytic domain of the factor. In this family, two differently
affected FX genes are present, leading to double heterozygosity of the
proposita and thus excluding consanguinity of parents. An apparently normal
gene structure was observed in the other patient with FX abnormality,
suggesting the presence of a small gene lesion.
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