Abstract
Human Waardenburg syndrome 2A (WS2A) is a dominant hearing loss (HL) syndrome caused by mutations in the microphthalmia-associated transcription factor (MITF) gene. In mouse models with MITF mutations, WS2A is transmitted in a recessive pattern, which limits the study of hearing loss (HL) pathology. In the current study, we performed ENU (ethylnitrosourea) mutagenesis that resulted in substituting a conserved lysine with a serine (p. L247S) in the DNA-binding domain of the MITF gene to generate a novel miniature pig model of WS2A. The heterozygous mutant pig (MITF +/L247S) exhibits a dominant form of profound HL and hypopigmentation in skin, hair, and iris, accompanied by degeneration of stria vascularis (SV), fused hair cells, and the absence of endocochlear potential, which indicate the pathology of human WS2A. Besides hypopigmentation and bilateral HL, the homozygous mutant pig (MITF L247S/L247S) and CRISPR/Cas9-mediated MITF bi-allelic knockout pigs both exhibited anophthalmia. Three WS2 patients carrying MITF mutations adjacent to the corresponding region were also identified. The pig models resemble the clinical symptom and molecular pathology of human WS2A patients perfectly, which will provide new clues for better understanding the etiology and development of novel treatment strategies for human HL.
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Acknowledgements
The authors thank all the personnel at the Beijing Farm Animals Research Center, the Chinese Academy of Sciences, and the Chinese Swine Mutagenesis Consortium, whose names are not listed as co-authors of this paper for their assistance. We appreciate the patients for their invaluable cooperation and participation.
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JZ, SY, and HW conceived the project with input from AM, QZ, and HW. All experiments were performed by TH, WG, JY, AL, MQ, XW, XW, YZ, DW, HS, QH, RZ, QJ, QZ, YL, TZ, and WJ. ZC and CC analyzed the data and conducted the bioinformatics analyses. JZ and JY wrote the manuscript with input from TH, ZC, and WG.
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This work was supported by the National Natural Science Foundation of China (81671274, 31601008, and 31402045); the Strategic Priority Research Program of CAS (XDA08000000 and XDA01030400); the National Transgenic Project of China (2016ZX08009003-006 and 2014ZX0801007B); the National Basic Research Program of China (2011CBA01005, 2011CB944100, 2011BAI15B02, 2012BAI39B04, and 2012CB967900); the National High Technology Research and Development Program of China (2012AA020602); and the National Institutes of Health (DC006908 to Z-Y C).
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Hai, T., Guo, W., Yao, J. et al. Creation of miniature pig model of human Waardenburg syndrome type 2A by ENU mutagenesis. Hum Genet 136, 1463–1475 (2017). https://doi.org/10.1007/s00439-017-1851-2
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DOI: https://doi.org/10.1007/s00439-017-1851-2