6nje

Structural highlights

Disease

[KIF22_HUMAN] Defects in KIF22 are the cause of spondyloepimetaphyseal dysplasia with joint laxity, type 2 (SEMDJL2) [MIM:603546]. A bone disease characterized by short stature, distinctive midface retrusion, progressive knee malalignment (genu valgum and/or varum), generalized ligamentous laxity, and mild spinal deformity. Intellectual development is not impaired. Radiographic characteristics include significantly retarded epiphyseal ossification that evolves into epiphyseal dysplasia and precocious osteoarthritis, metaphyseal irregularities and vertical striations, constricted femoral neck, slender metacarpals and metatarsals, and mild thoracolumbar kyphosis or scoliosis with normal or mild platyspondyly. The most distinctive features for differential diagnosis of SEMDJL2 are the slender metacarpals and phalanges and the progressive degeneration of carpal bones; however, these 2 features are evident only in older children and young adults. The soft consistency of cartilage in the airways leads to laryngotracheomalacia with proneness to respiratory obstruction and inspiratory stridor in infancy and childhood.^{[1] [2]}

Function

[KIF22_HUMAN] Kinesin family that is involved in spindle formation and the movements of chromosomes during mitosis and meiosis. Binds to microtubules and to DNA.

References

1. ↑ Min BJ, Kim N, Chung T, Kim OH, Nishimura G, Chung CY, Song HR, Kim HW, Lee HR, Kim J, Kang TH, Seo ME, Yang SD, Kim DH, Lee SB, Kim JI, Seo JS, Choi JY, Kang D, Kim D, Park WY, Cho TJ. Whole-exome sequencing identifies mutations of KIF22 in spondyloepimetaphyseal dysplasia with joint laxity, leptodactylic type. Am J Hum Genet. 2011 Dec 9;89(6):760-6. doi: 10.1016/j.ajhg.2011.10.015. PMID:22152677 doi:10.1016/j.ajhg.2011.10.015
2. ↑ Boyden ED, Campos-Xavier AB, Kalamajski S, Cameron TL, Suarez P, Tanackovic G, Andria G, Ballhausen D, Briggs MD, Hartley C, Cohn DH, Davidson HR, Hall C, Ikegawa S, Jouk PS, Konig R, Megarbane A, Nishimura G, Lachman RS, Mortier G, Rimoin DL, Rogers RC, Rossi M, Sawada H, Scott R, Unger S, Valadares ER, Bateman JF, Warman ML, Superti-Furga A, Bonafe L. Recurrent dominant mutations affecting two adjacent residues in the motor domain of the monomeric kinesin KIF22 result in skeletal dysplasia and joint laxity. Am J Hum Genet. 2011 Dec 9;89(6):767-72. doi: 10.1016/j.ajhg.2011.10.016. PMID:22152678 doi:10.1016/j.ajhg.2011.10.016