Abstract
We report the clinical and molecular characteristics of 12 Spanish families with multiple members affected with Léri-Weill dyschondrosteosis (LWD) or Langer mesomelic dysplasia (LMD), who present the SHOX (short stature homeobox gene) mutation p.A170P (c.508G>C) in heterozygosity or homozygosity, respectively. In all studied families, the A170P mutation co-segregated with the fully penetrant phenotype of mesomelic limb shortening and Madelung deformity. A shared haplotype around SHOX was observed by microsatellite analysis, confirming the presence of a common ancestor, probably of Gypsy origin, as 11 of the families were of this ethnic group. Mutation screening in 359 Eastern-European Gypsies failed to identify any carriers. For the first time, we have shown SHOX expression in the human growth plate of a 22-week LMD fetus, homozygous for the A170P mutation. Although the mutant SHOX protein was expressed in all zones of the growth plate, the chondrocyte columns in the proliferative zone were disorganized with the chondrocytes occurring in smaller columnal clusters. We have also identified a novel mutation at the same residue, c. 509C>A (p.A170D), in two unrelated Spanish LWD families, which similar to A170P mutation impedes nuclear localization of SHOX. In conclusion, we have identified A170P as the first frequent SHOX mutation in Gypsy LWD and LMD individuals.
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Acknowledgements
We thank Noelia Sanchez for her technical help, Charo De Pablo Diaz for donating the Spanish gypsy controls and to all the clinicians involved with these families. This work was supported by grants from the ‘Ministerio de Ciencia e Innovación’ (MICINN, SAF2006-00663 and SAF2009-08230). VB-T was supported by a FPI Ph.D fellowship from the MICINN (SAF2006-00663), SB-S by a CIBERER postdoctoral fellowship and MA-C by a postdoctoral fellowship from MICINN (SAF2006-00663).
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Barca-Tierno, V., Aza-Carmona, M., Barroso, E. et al. Identification of a Gypsy SHOX mutation (p.A170P) in Léri-Weill dyschondrosteosis and Langer mesomelic dysplasia. Eur J Hum Genet 19, 1218–1225 (2011). https://doi.org/10.1038/ejhg.2011.128
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DOI: https://doi.org/10.1038/ejhg.2011.128
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