Genomic imbalances detected through array CGH in fetuses with holoprosencephaly

Arquivos de Neuro-Psiquiatria

Isabela Nelly Machado¹  Juliana Karina Heinrich¹  Ricardo Barini¹ 

[1] ,UNICAMP State University of Campinas Faculty of Medical SciencesCampinas SP ,Brazil

关键词: holoprosencephaly;    comparative genomic hybridization;    prenatal diagnosis;    genetic testing;    genomic instability;    holoprosencefalia;    hibridização genômica comparativa;    diagnóstico pré-natal;    análise genética;    instabilidade genômica;   

DOI  :  10.1590/S0004-282X2011000100002

来源: SciELO

【 摘 要 】

OBJECTIVE: Holoprosencephaly (HPE) is heterogeneous in pathogenesis, integrating genetic susceptibility with the influence of environmental factors. Submicroscopic aberrations may contribute to the etiology of HPE. Our aim was to report the molecular analysis of 4 fetuses with HPE and normal metaphase karyotype. METHOD: A whole genome BAC-array based Comparative Genomic Hybridization (array CGH) was carried out in fetal blood samples. All potential cytogenetic alterations detected on the arrays were matched against the known copy number variations databases. RESULTS: The array CGH analysis showed copy number gains and losses in all cases. We found a recurrent deletion in 15q14 (clone RP11-23J11) and in 15q22 (clone RP11-537k8) in 2 out 4 cases analyzed. We also observed submicroscopic gain in 6p21 in 3 out of 4 fetuses in nearby clones. All these regions were tested in known databases and no copy number variations have been described for them. CONCLUSION: This is the first report of molecular characterization through a whole genome microarray CGH of fetuses with HPE. Our results may contribute to verify the effectiveness and applicability of the molecular technique of array CGH for prenatal diagnosis purposes, and contributing to the knowledge of the submicroscopic genomic instability characterization of HPE fetuses.

【 授权许可】

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