Introduction:

Neurofibromatosis type i is a hereditary, autosomal dominant, multisystemic, progressive disease with complete penetrance and variable manifestation. The analysis of families with molecular markers allows diagnosis by indirect methods.

Objectives:

To study two Cuban families with at least one case of neurofibromatosis type i and to identify the alleles resulting from the polymorphism for molecular diagnosis.

Methods:

A descriptive study of two families with at least one case of neurofibromatosis type i was performed. DNA was extracted with the saline precipitation technique and polymerase chain reaction was used for amplification of the fragment of interest. Enzymatic digestion was performed with the RsaI enzyme to analyze the alleles of the polymorphism studied and then to perform electrophoresis in 2% agarose gel.

Results:

The most frequent clinical manifestations were café-au-lait spots, axillary and inguinal freckles and bone lesions. Alleles 1 and 2 were detected when analyzing the polymorphism in the samples. The allele frequencies were 38.5 % and 61.5 % respectively.

Conclusions:

The main clinical manifestations in patients were identified. The technique for polymorphism analysis allowed the molecular study in the families with neurofibromatosis type i. The alleles of the molecular marker and their frequencies were detected. Molecular diagnosis of suspected individuals was performed.

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