Malfunction of the SLC26A4 protein leads to Pendred syndrome, characterized by sensorineural hearing loss, often associated with mild thyroid dysfunction and goiter. It is generally assumed that SLC26A4 acts as a chloride/anion exchanger, which in the thyroid gland transports iodide, and in the inner ear contributes to the conditioning of the endolymphatic fluid. Here we describe a fast fluorometric method able to be used to functionally scrutinize SLC26A4 and its mutants described in Pendred syndrome. The validation of the method was done by functionally characterizing the chloride/iodide transport of SLC26A4, and a mutant, i.e. SLC26A4(S28R), which we previously described in a patient with sensorineural hearing loss, hypothyroidism and goiter. Using the fluorometric method we describe here we can continuously monitor and quantify the iodide or chloride amounts transported by the cells, and we found that the transport capability of the SLC26A4(S28R) mutant protein is markedly reduced if compared to wild-type SLC26A4.

译文

SLC26A4蛋白的故障导致Pendred综合征,其特征是感音神经性听力损失,通常与轻度甲状腺功能障碍和甲状腺肿有关。通常认为SLC26A4充当氯化物/阴离子交换剂,在甲状腺中转运碘化物,在内耳中有助于调节内淋巴液。在这里,我们描述了一种快速荧光测量方法,该方法能够用于功能检查SLC26A4及其在Pendred综合征中描述的突变体。该方法的验证是通过功能表征SLC26A4的氯化物/碘化物转运和突变体即SLC26A4(S28R) 来完成的,我们先前在患有感音神经性听力损失,甲状腺功能减退和甲状腺肿的患者中进行了描述。使用我们在这里描述的荧光法,我们可以连续监测和定量细胞转运的碘化物或氯化物量,并且我们发现与野生型SLC26A4相比,SLC26A4(S28R) 突变蛋白的转运能力显着降低。

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