RESUMO
Se realizó en 16 niños con leucemia aguda no linfoblástica estudio citogenético de la médula ósea por medio de dos métodos para la obtención de cariotipo para su análisis cromosómico: el método directo y el de cultivo de 48 horas. La investigación tuvo como objeto conocer las alteraciones citogenéticas en la población, debido al origen clonal de la enfermedad. Estas son útiles para valorar la remisión de la enfermedad y la respuesta al tratamiento, a la vez que permite dar un pronóstico
Assuntos
Humanos , Masculino , Feminino , Pré-Escolar , Adolescente , Cariótipo XYY/classificação , Cariótipo XYY/genética , Leucemia Mieloide Aguda/diagnóstico , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/terapia , Meios de Cultura/análise , Meios de Cultura , Citogenética/estatística & dados numéricosRESUMO
A sample of 47,XYY males was examined for taurodontism to provide further information on the effects of chromosome aneuploidies on the trait. The etiology of taurodontism is reviewed in light of recent findings. Two models have been put forward to explain the association of taurodontism with chromosome abnormalities: (1) Taurodontism results from a generalized disruption of developmental homeostasis, and (2) the development of taurodontism reflects a more specific action of the genes. The recent findings in 45,X females indicate that this chromosome aneuploidy does not have any effect on the development of taurodontism, in contrast to the findings of increased frequency of the trait in individuals with extra X chromosomes. The present results in 47,XYY males suggest that the presence of an extra Y chromosome does not cause an increase in the expression of taurodontism. It is concluded that the observed variation in the occurrence of taurodontism in individuals with sex chromosomes aneuploidies does not corroborate the hypothesis of disrupted homeostasis. Instead, the findings indicate that more specific action of gene(s) on the X chromosome is involved. We suggest that the effect of the Y chromosome on growth of both enamel and dentin, possibly in a regulative way, could be involved in the balanced growth of dental structures in 47,XYY males.
