Introduction:

Hemophilia A is an X-linked recessive disease with an incidence of 1 in 5 000 to 10 000 males. It is the most common congenital hemostatic disorder in men. The inversion of introns 1 and 22 in patients with a severe phenotype is considered the most frequent abnormality, with a prevalence of 1 to 5% and 45 to 50%, respectively.

Objective:

To determine the frequency of introns 1 and 22 inversions in factor VIII gene in children under 18 years with severe hemophilia A in Bogotá.

Materials and methods:

This is a non-experimental, descriptive, transverse study. The inversions of introns 1 and 22 for factor VIII gene were identified using long-distance polymerase chain reaction techniques in pediatric patients with severe Hemophilia A treated in different centers of Bogotá, Colombia.

Results:

Thirty patients were analyzed. Inversion of intron 22 was found in 12 patients (40%), while inversion of intron 1 was observed in 3 patients. These findings are similar to other studies.

Conclusions:

Inversions of intron 22 and 1 were found in half of this group of patients. These results are reproducible and useful to identify the two most frequent mutations in severe hemophilia A patients.

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