Whole-Exome Sequencing Identifies Mutations of KIF22 in Spondyloepimetaphyseal Dysplasia with Joint Laxity, Leptodactylic Type

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Spondyloepimetaphyseal dysplasia with joint laxity (SEMDJL), leptodactylic (lepto-SEMDJL) or Hall type, is an autosomal-dominant skeletal dysplasia manifesting with short stature, joint laxity with dislocation(s), limb malalignment, and spinal deformity. Its causative gene mutation has not yet been discovered. We captured and sequenced the exomes of eight affected individuals in six unrelated kindreds (three individuals in a family and five simplex individuals). Five novel sequence variants in KIF22, which encodes a member of the kinesin-like protein family, were identified in seven individuals. Sanger sequencing of KIF22 confirmed that c.443C>T (p.Pro148Ser) cosegregated with the phenotype in the affected individuals in the family; c.442C>T (p.Pro148Leu) or c.446G>A (p.Arg149Gln) was present in four of five simplex individuals, but was absent in unaffected individuals in their family and 505 normal cohorts. KIF22 mRNA was detected in human bone, cartilage, joint capsule, ligament, skin, and primary cultured chondrocytes. In silico analysis of KIF22 protein structure indicates that Pro148 and Arg149 are important in maintaining hydrogen bonds in the ATP binding and motor domains of KIF22. We conclude that these mutations in KIF22 cause lepto-SEMDJL.
Publisher
CELL PRESS
Issue Date
2011-12
Language
English
Article Type
Article
Keywords

DISLOCATIONS HALL TYPE; GENETIC SKELETAL DISORDERS; MULTIPLE DISLOCATIONS; DOMINANT INHERITANCE; DIAGNOSTIC FEATURE; DISTINCT FORM; KINESIN; DNA; CLASSIFICATION; ALIGNMENT

Citation

AMERICAN JOURNAL OF HUMAN GENETICS, v.89, no.6, pp.760 - 766

ISSN
0002-9297
URI
http://hdl.handle.net/10203/98952
Appears in Collection
BiS-Journal Papers(저널논문)
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