A method for single molecule localization microscopy of tissues reveals non-random distribution of nuclear pores in Drosophila

A method for single molecule localization microscopy of tissues reveals non-random distribution of nuclear pores in Drosophila
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组织单分子定位显微镜方法揭示果蝇核孔的非随机分布

DOI:
10.1101/2021.05.24.445468
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发表时间:
2021
期刊:
--
影响因子:
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通讯作者:
Cheng J
Cheng J
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作者:
Cheng J

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单分子定位显微术(SMLM)可以在薄样品中提供纳米级分辨率,但由于离焦发射器的高背景,因此很少应用于组织。在这里,我们描述了一个线扫描显微镜,提供光学切片SMLM组织。使用DNA-和肽-PAINT在该系统上对内源性标记的核孔蛋白和F-肌动蛋白进行成像,通常在大于20 µm的深度处提供30 nm或更好的分辨率。这表明,与培养的细胞相比,核孔在大多数果蝇组织中是非随机分布的。核纤层蛋白Dm 0与核孔互补定位,表明核纤层蛋白Dm 0对核孔起着补充作用。此外,异位表达的组织特异性核纤层蛋白C分布的核孔更随机,而核纤层蛋白C突变体增强核孔集群,特别是在肌肉细胞核。由于核孔蛋白与特定的染色质结构域相互作用,核孔聚集可以局部调节染色质组织,并有助于由人类核纤层蛋白A/C核纤层蛋白病引起的疾病表型。
Single Molecule Localisation Microscopy (SMLM) can provide nanoscale resolution in thin samples but has rarely been applied to tissues, because of high background from out of focus emitters. Here we describe a line scanning microscope that provides optical sectioning for SMLM in tissues. Imaging endogenously-tagged nucleoporins and F-actin on this system using DNA- and peptide-PAINT routinely gives 30nm resolution or better at depths greater than 20 µm. This revealed that the nuclear pores are nonrandomly distributed in mostDrosophilatissues, in contrast to cultured cells. Lamin Dm0shows a complementary localisation to the nuclear pores, suggesting that it corrals the pores. Furthermore, ectopic expression of the tissue-specific Lamin C distributes the nuclear pores more randomly, whereaslamin Cmutants enhance nuclear pore clustering, particularly in muscle nuclei. Since nucleoporins interact with specific chromatin domains, nuclear pore clustering could regulate chromatin organisation locally and contribute to the disease phenotypes caused by human Lamin A/C laminopathies.
果蝇A型核纤层蛋白C的缺失最初会导致肌腱异常,包括肌肉缺陷中细胞骨架和核纤层的解体。
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