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        Mutation of IPO13 causes recessive ocular coloboma, microphthalmia, and cataract

        Xiu-Feng Huang,Lue Xiang,Wan Cheng,Fei-Fei Cheng,Kai-Wen He,Bo-Wen Zhang,Si-Si Zheng,Ru-Yi Han,Yi-Han Zheng,Xiao-Tao Xu,Huan-Yun Yu,Wenjuan Zhuang,Yuk Fai Leung,Zi-Bing Jin 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-

        Ocular coloboma is a developmental structural defect of the eye that often occurs as complex ocular anomalies. However, its genetic etiology remains largely unexplored. Here we report the identification of mutation (c.331C>T, p. R111C) in the IPO13 gene in a consanguineous family with ocular coloboma, microphthalmia, and cataract by a combination of whole-exome sequencing and homozygosity mapping. IPO13 encodes an importin-B family protein and has been proven to be associated with the pathogenesis of coloboma and microphthalmia. We found that Ipo13 was expressed in the cornea, sclera, lens, and retina in mice. Additionally, the mRNA expression level of Ipo13 decreased significantly in the patient compared with its expression in a healthy individual. Morpholinooligonucleotide- induced knockdown of ipo13 in zebrafish caused dose-dependent microphthalmia and coloboma, which is highly similar to the ocular phenotypes in the patient. Moreover, both visual motor response and optokinetic response were impaired severely. Notably, these ocular phenotypes in ipo13-deficient zebrafish could be rescued remarkably by full-length ipo13 mRNA, suggesting that the phenotypes observed in zebrafish were due to insufficient ipo13 function. Altogether, our findings demonstrate, for the first time, a new role of IPO13 in eye morphogenesis and that loss of function of IPO13 could lead to ocular coloboma, microphthalmia, and cataract in humans and zebrafish.

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