Prenatal diagnosis of maternally inherited X-linked Opitz G/BBB syndrome by chromosomal microarray in a fetus with complex congenital heart disease

Abstract

Background: Prenatal sonographic diagnosis of Optiz G/BBB syndrome is difficult because the common clinical features, such as hypertelorism, hypospadias and abnormalities of midline structures, including laryngotracheoesophageal defects, are subtle.

Method: Chromosomal microarray (CMA) analysis using a target enriched Fetal DNA Chip design was performed on the DNA of a fetus with congenital cardiac abnormalities.

Results: Fetal DNA chip revealed a 48Kb single copy number loss within chromosome region Xp22.2 (arr[hg18]Xp22.2(10,627,354-10,675,946)x0 mat). This deletion included the 3' UTR region of the MID1 gene predicted to cause the X-linked Opitz G/BBB syndrome.

Conclusions: This case supports the use of CMA in prenatal diagnosis of fetuses with congenital heart disease. CMA allows prenatal diagnosis of genomic aberrations at a much higher resolution compared with conventional karyotyping, and such findings enable proper genetic counseling and decision making in the pregnancy.

Keywords: Heart disease; MID1; Microdeletion; X-linked Opitz G/BBB syndrome; aCGH.