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Waardenburg syndrome type 1 (WS1) is a rare autosomal dominant genetic disorder of neural crest cells (NCC) characterized by congenital sensorineural hearing loss, dystopia canthorum, and abnormal iris pigmentation. WS1 is due to loss-of-function mutations in paired box gene 3 (PAX3). Here, we identified a novel PAX3 mutation (c.808C>G, p.R270G) in a three-generation Chinese family with WS1, and...
MITF mutations results in an abnormal melanocyte development and lead to Waardenburg syndrome type 2 (WS2). Here, we analyzed the in vitro activities of two recently identified WS2-associated MITF mutations (p.R217I and p.T192fsX18). The R217I MITF retained partial activity, normal DNA-binding ability and nuclear distribution, whereas the T192fsX18 MITF failed to activate TYR promoter and showed aberrant...
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