한빛사논문
Abstract
Byung-Joo Min1, 9, Namshin Kim3, 9, Taesu Chung4, Ok-Hwa Kim5, Gen Nishimura6, Chin Youb Chung2, Hae Ryong Song7, Hyun Woo Kim8, Hye Ran Lee2, Jiwoong Kim3, Tae-Hoon Kang1, Myung-Eui Seo1, San-Deok Yang1, Do-Hwan Kim1, Seung-Bok Lee1, Jong-Il Kim1, Jeong-Sun Seo1, Ji-Yeob Choi1, Daehee Kang1, Dongsup Kim4, Woong-Yang Park1 and Tae-Joon Cho2
1 Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 110-799, Korea
2 Department of Orthopaedic Surgery, Seoul National University College of Medicine, Seoul 110-799, Korea
3 Korean Bioinformation Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Korea
4 Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
5 Department of Radiology, Ajou University Hospital, Suwon, Kyunggi 443-721, Korea
6 Department of Pediatric Imaging, Tokyo Metropolitan Children's Medical Center, Kiyose, Tokyo 204-8567, Japan
7 Department of Orthopaedic Surgery, Korea University Guro Hospital, Seoul 152-703, Korea
8 Department of Orthopaedic Surgery, Yonsei University Severance Children's Hospital, Seoul 120-752, Korea
Corresponding author : Woong-Yang Park
Corresponding author : Tae-Joon Cho
9 These two authors contributed equally
Abstract
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.
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