Abstract
Congenital talipes equinovarus (CTEV) is one of the most common musculoskeletal disorders. Genetic factors have been suggested to be an important contributor to its pathogenesis. Some genes, including PITX1, TBX4, and RBM10, have been associated with CTEV. We aimed to determine the disease-causing mutations in Chinese patients with isolated CTEV. Genomic DNA was extracted from peripheral blood samples of a three-generation pedigree and 53 sporadic patients with CTEV. Whole-exome sequencing and Sanger sequencing were used to identify and validate disease-causing mutations, respectively. A putative pathogenic mutation c.4717G>T (p.D1573Y) in the filamin B (FLNB) gene, which co-segregated with CETV, was identified in the pedigree. Two additional novel missense mutations in the same gene [c.1897A>G (p.M633V) and c.2195A>G (p.Y732C)] were identified from the 53 sporadic patients. Plasmids expressing wild-type or mutant constructs were transfected into HEK293T cells to determine whether these amino acid substitutions affect protein activity. All three (M633V, Y732C, and D1573Y) affected FLNB protein expression and led to cytoplasmic focal accumulation. Our results provide evidence for the involvement of FLNB in the pathogenesis of isolated CTEV and have expanded the clinical spectrum of FLNB mutations.
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Acknowledgments
We thank the patients and their parents for consenting to participate in this study. The full-length wild-type FLNB cDNA clone was kindly provided by Dr. Philip B. Daniel (Dunedin School of Medicine University of Otago, Dunedin,New Zealand) and Dr. A. Sonnenberg (Netherlands Cancer Institute, Amsterdam, The Netherlands). This study was further supported by grants from Pudong New Area of Science and Technology Development Fund (PKJ2013-Y62) and Shanghai Jiao Tong University School of Medicine Science Fund (13XJ22009).
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H. Yang and Z. Zheng contributed equally to this work and should be considered as co-first authors.
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439_2016_1701_MOESM2_ESM.tif
Supplement Fig. 2. Schematic diagram of FLNB protein indicating the frequencies of mutations underlying the AO-LS-BD-SCT spectrum. Actin-binding domains were shown as rectangle, immunoglobulin-like filamin repeats as oval, and hinge regions as thick line. Column height indicated frequency within the associated domain (actual numbers were given above the columns), while column color represented disease association as follows: AOI/III (red), LS (green), BD (yellow), SCT (dark blue) (TIFF 1993 kb)
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Yang, H., Zheng, Z., Cai, H. et al. Three novel missense mutations in the filamin B gene are associated with isolated congenital talipes equinovarus. Hum Genet 135, 1181–1189 (2016). https://doi.org/10.1007/s00439-016-1701-7
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DOI: https://doi.org/10.1007/s00439-016-1701-7