Resumo

MANSINI, Adrián P et al. Mutation characterization in the GATA-1 gene in patients with Down's Syndrome diagnosed with transient abnormal myelopoiesis or acute megakaryoblastic leukemia. Arch. argent. pediatr. [online]. 2013, vol.111, n.6. ISSN 0325-0075.  http://dx.doi.org/10.5546/aap.2013.532.

Patients with Down's Syndrome have a higher risk of developing acute megakaryoblastic leukemia (AML). Ten per cent of newborn infants with this syndrome have transient abnormal myelopoiesis (TAM), indistinguishable from AML, which generally remits spontaneously. A high incidence of GATA-1 gene mutations was described in both groups of patients. Fourteen bone marrow DNA samples (10 ATM/4 AML) were analyzed by PCR and sequencing; these samples were obtained from 13 patients with Down's Syndrome to describe the rate and mutation characteristics of the GATA-1 gene in the studied population and its consequences at a protein level. Mutations were detected in 10 out of 10 TAM and in 3 out of 4 AML, which at a protein level would result in an early termination codon (n= 5), alterations in the splicing site (n= 6) or sequence change (n= 3). The high rate of GATA-1 gene mutations was confirmed in newborn infants with Down's Syndrome and MAT or AML.

Palavras-chave : transient abnormal myelopoiesis; megakaryoblastic leukemia; GATA-1; Down's Syndrome.

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