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Mol Genet Metab. 2008 Aug;94(4):498-502. doi: 10.1016/j.ymgme.2008.04.011. Epub 2008 Jun 3.

Complex management of a patient with a contiguous Xp11.4 gene deletion involving ornithine transcarbamylase: a role for detailed molecular analysis in complex presentations of classical diseases.

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  • 1Division of Metabolic Diseases, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.


A male infant was diagnosed prenatally with a partial ornithine transcarbamylase (OTC) gene deletion and managed from birth. However, he displayed neurological abnormalities and developed pleural effusions, ascites and anasarca not solely explained by OTC deficiency (OTCD). Further evaluation of the gene locus using exon-specific PCR and high-density SNP array copy number analysis revealed a 3.9-Mb deletion from Xp11.4 to Xp21.1 including five additional gene deletions, three causing the known genetic diseases: Retinitis pigmentosa (RP3), X-linked chronic granulomatous disease (CGD) and McLeod syndrome. The case illustrates (1) the complexities of managing a patient with neonatal onset OTCD, CGD, RP3 and McLeod syndrome, (2) the need for detailed evaluation in seemingly "isolated" gene deletions and (3) the clinical utility of high-density copy number analysis for rapidly characterizing chromosomal lesions.

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