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OFD1, the Gene Mutated in Oral-Facial-Digital Syndrome Type 1, Is Expressed in the Metanephros and in Human Embryonic Renal Mesenchymal Cells

Leila Romio^*,, Victoria Wright, Karen Price^*, Paul J.D. Winyard^*, Dian Donnai, Mary E. Porteous, Brunella Franco^¶, Giovanna Giorgio^¶, Sue Malcolm, Adrian S. Woolf^* and Sally A. Feather^*,

*Nephro-Urology and Clinical and Molecular Genetics Units, Institute of Child Health, University College London, England; University Department of Medical Genetics, St. Mary’s Hospital, Manchester, England; Department of Clinical Genetics, Western General Hospital, Edinburgh, Scotland; and ^¶Telethon Institute of Genetics and Medicine, Naples, Italy.

Correspondence to Dr. Leila Romio, Clinical and Molecular Genetics Unit, Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK. Phone: 44-20-7905-2263; Fax: 44-20-7916-0011;

ABSTRACT. Oral-facial-digital syndrome type 1 (OFD1) causes polycystic kidney disease (PKD) and malformations of the mouth, face and digits. Recently, a gene on Xp22, OFD1, was reported to be mutated in a limited set of OFD1 patients. This study describes mutation analysis in six further OFD1 families. Additionally, gene expression was sought in human development. In two OFD1 kindreds affected by PKD, a frameshift mutation and a splice-site mutation were detected. In four apparently sporadic cases, three frameshift and a missense mutation were found. Using RT-PCR of RNA from first-trimester normal human embryos, both alternative splice forms of mRNA (OFD1a and OFD1b) were found to be widely expressed in organogenesis. Northern blot detected OFD1 mRNA in metanephros, brain, tongue, and limb, all organs affected in the syndrome. A polyclonal antibody directed to a C-terminal OFD1a epitope detected a 120-kD protein in the metanephros and in human renal mesenchymal cell lines. In normal human embryos, OFD1a immunolocalized to the metanephric mesenchyme, oral mucosa, nasal and cranial cartilage, and brain. Moreover, using normal human renal mesenchymal cell lines, the immunoreactive protein colocalized with -tubulin, suggesting that OFD1 is associated with the centrosome. First, it is concluded that OFD1 mutations would generally be predicted to result in unstable transcripts or nonfunctional proteins. Second, OFD1 is expressed in human organogenesis; on the basis of the metanephric expression pattern, the results suggest that OFD1 plays a role in differentiation of metanephric precursor cells. E-mail: lromio@ich.ucl.ac.uk

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