title: WDR35 mutation in siblings with Sensenbrenner syndrome: a ciliopathy with variable phenotype.
abstract: Sensenbrenner syndrome and unclassified short rib-polydactyly conditions are ciliopathies with overlapping phenotypes and genetic heterogeneity. Mutations in WDR35 were identified recently in a sub-group of patients with Sensenbrenner syndrome and in a single family that presented with an unclassified form of short-rib polydactyly (SRP) syndrome. We report on siblings with an unusual combination of phenotypes: narrow thorax, short stature, minor anomalies, developmental delay, and severe hepatic fibrosis leading to liver failure and early death in two of the children. Both parents were unaffected suggesting autosomal recessive inheritance. The family and their affected children were followed over a decade. Exome sequencing was performed in one affected individual. It showed a homozygous missense mutation in a highly conserved position of the WDR35 gene. This family represents a WDR35-ciliopathy with a complex clinical presentation that includes significant overlap of the phenotypes described in Sensenbrenner syndrome and the unclassified SRPs. The accurate molecular diagnosis of this family exemplifies the power of exome sequencing in the diagnosis of Mendelian disorders and enabled us to broaden and refine our understanding of Sensenbrenner syndrome and SRP. Detailed genotype-phenotype information is provided as well as discussion of previously reported cases.
authors.affiliation: Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA.
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Bacino
authors.forename: Shweta U
authors.initials: SU
authors.lastname: Dhar
authors.forename: Nicola
authors.initials: N
authors.lastname: Brunetti-Pierri
authors.forename: Brendan
authors.initials: B
authors.lastname: Lee
authors.forename: Penelope E
authors.initials: PE
authors.lastname: Bonnen
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D001842:Bone and Bones / Q000002:abnormalities; D003398:Craniosynostoses / Q000175:diagnosis / Q000235:genetics*; D003598:Cytoskeletal Proteins; D004476:Ectodermal Dysplasia / Q000175:diagnosis / Q000235:genetics*; D059472:Exome; D005260:Female; D053823:Hedgehog Proteins; D006720:Homozygote; D006801:Humans; D007223:Infant; D047908:Intracellular Signaling Peptides and Proteins; D008297:Male; D009154:Mutation; D020125:Mutation, Missense; D010375:Pedigree; D010641:Phenotype; D011506:Proteins / Q000235:genetics*; D035781:Siblings
chemical_list: D003598:Cytoskeletal Proteins; D053823:Hedgehog Proteins; D047908:Intracellular Signaling Peptides and Proteins; D011506:Proteins; C558596:WDR35 protein, human