Three-dimensional total-internal reflection fluorescence nanoscopy with nanometric axial resolution by photometric localization of single molecules

Three-dimensional total-internal reflection fluorescence nanoscopy with nanometric axial resolution by photometric localization of single molecules
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通过单分子光度定位实现纳米轴向分辨率的三维全内反射荧光纳米镜

DOI:
10.1101/693994
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发表时间:
2019
期刊:
--
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通讯作者:
Szalai A
Szalai A
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--
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--
作者:
Szalai A

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单分子定位显微镜可以实现远场成像,横向分辨率在10到20纳米的范围内,利用单分子图像的中心位置可以比图像本身的大小更精确地确定这一事实。然而,在轴向(第三)维度上达到相同的分辨率水平仍然具有挑战性。在这里,我们提出了超临界照明显微镜光度z定位与增强分辨率(更简单),一个光度法解码单分子的轴向位置在全内反射荧光显微镜。与传统的全内反射荧光显微镜相比,更简单的方法不需要任何硬件修改,并且可以补充任何2D单分子定位显微镜方法,以提供几乎各向同性纳米分辨率的3D图像。性能示例包括核孔复合物的SIMPLER-direct随机光学重建显微镜图像,轴向定位精度低于20 nm,以及通过SIMPLER-DNA点积累在纳米尺度上成像,轴向定位精度低于10 nm的微管截面可视化。
Single-molecule localization microscopy enables far-field imaging with lateral resolution in the range of 10 to 20 nanometres, exploiting the fact that the centre position of a single-molecule’s image can be determined with much higher accuracy than the size of that image itself. However, attaining the same level of resolution in the axial (third) dimension remains challenging. Here, we present Supercritical Illumination Microscopy Photometric z-Localization with Enhanced Resolution (SIMPLER), a photometric method to decode the axial position of single molecules in a total internal reflection fluorescence microscope. SIMPLER requires no hardware modification whatsoever to a conventional total internal reflection fluorescence microscope and complements any 2D single-molecule localization microscopy method to deliver 3D images with nearly isotropic nanometric resolution. Performance examples include SIMPLER-direct stochastic optical reconstruction microscopy images of the nuclear pore complex with sub-20 nm axial localization precision and visualization of microtubule cross-sections through SIMPLER-DNA points accumulation for imaging in nanoscale topography with sub-10 nm axial localization precision.
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