Resumo

CASTILLO-GONZALEZ, Dunia de la C.. Some clinical-genetic considerations of the thrombocytopenia with lack of radios. Rev Cubana Hematol Inmunol Hemoter [online]. 2010, vol.26, n.4, pp. 276-284. ISSN 1561-2996.

The thrombocytopenia with lack of radios (TLR) is uncommon genetic syndrome characterized by a bilateral lack of radios with presence of both thumbs and thrombocytopenia. Also, may to be present malformations of lower extremities, cardiovascular, gastrointestinal, neurological and vascular. The inheritance way is autosomal recessive, but according to the evidences founded in different studies, this is not the only pattern; there are families where there was an autosomal dominant pattern inheritance with reduced penetrance. Different genes have been studied to try to explain the mutation provoking this syndrome including the HOX genes involved in the megakaryocytic thrombocytopenia, but its relation with the TLR syndrome has been not found. Nuclear studies have demonstrated the presence of an interstitial microdeletion at level of 1q21.1 locus as a necessary condition but not enough for the complete development of the TLR phenotype. In recent researches has been demonstrated the lack of expression of endoglin in stromal cells of patients presenting with TLR. In laboratory mice it was noted that the trans-membrane genetic inactivation of this protein present in human endothelial cells is associated with intrauterine fetal deaths due to severe vascular and cardiac abnormalities.

Palavras-chave : Thrombocytopenia; lack of radios; genetics.

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