Pierre Robin sequence (PRS) is an important subgroup of cleft palate. We report several lines of evidence for the existence of a 17q24 locus underlying PRS, including linkage analysis results, a clustering of translocation breakpoints 1.06–1.23 Mb upstream of SOX9, and microdeletions both ∼1.5 Mb centromeric and ∼1.5 Mb telomeric of SOX9. We have also identified a heterozygous point mutation in an evolutionarily conserved region of DNA with in vitro and in vivo features of a developmental enhancer. This enhancer is centromeric to the breakpoint cluster and maps within one of the microdeletion regions. The mutation abrogates the in vitro enhancer function and alters binding of the transcription factor MSX1 as compared to the wild-type sequence. In the developing mouse mandible, the 3-Mb region bounded by the microdeletions shows a regionally specific chromatin decompaction in cells expressing Sox9. Some cases of PRS may thus result from developmental misexpression of SOX9 due to disruption of very-long-range cis-regulatory elements.
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We are grateful to the affected individuals and their families who participated in this study, to the Associations Françaises du Syndrome de Robin, to the Centres de Références Anomalies Cranio-Faciales Rares (AP-HP, Necker and Trousseau hospitals), and to C. Ozilou, G. Staub and G. Guédu-Molina for assistance. We thank T. Attié-Bitach, G. Couly and L. Legeai-Mallet (Necker) and V. van Heyningen and R. Hill (MRC HGU) for useful discussion. This study was underwritten by grants from the Agence Nationale de la Recherche (ERARE grant CraniRare), EUROCRAN FP5, the Fondation pour la Recherche Médicale (FRM), the MRC (UK) and the National Health and Medical Research Council (Australia). S.T. was supported in part by grant NS039818 from the US National Institutes of Health and S.B. by the FRM.
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Benko, S., Fantes, J., Amiel, J. et al. Highly conserved non-coding elements on either side of SOX9 associated with Pierre Robin sequence. Nat Genet 41, 359–364 (2009). https://doi.org/10.1038/ng.329
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