Mitochondrial growth during the cell cycle of Trypanosoma brucei bloodstream forms.

Mitochondrial growth during the cell cycle of Trypanosoma brucei bloodstream forms.
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布鲁氏血流形式的细胞周期中的线粒体生长。

DOI:
10.1038/srep36565
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发表时间:
2016-11-22
期刊:
影响因子:
4.6
通讯作者:
Ochsenreiter T
Ochsenreiter T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Jakob M;Hoffmann A;Amodeo S;Peitsch C;Zuber B;Ochsenreiter T

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线粒体细胞器在细胞分裂过程中需要复制。人们已经对该过程的许多方面进行了详细研究,但实际尺寸的增加和细胞器生长的位置尚不清楚。我们使用含有单个线粒体的原生动物寄生虫布氏锥虫通过荧光显微镜研究细胞器生物发生。通过对非同步群体的 1000 多个布氏锥虫血流形式细胞的分析,我们得出结论,线粒体网络主要从沿着主细胞器轴的两个区域(细胞核的后部和前部)生长。这两个区域的环路和分支最终融合形成一个复杂的网络。随着细胞后部分裂折叠的出现,线粒体网络被修剪并最终分离成两个子细胞。总体细胞器生物发生在细胞生长过程中不是连续的,并且主要发生在细胞周期的最后部分。此外,使用 3D STED 超分辨率显微镜,我们重建了细胞器的体积,并通过串行块面扫描电子显微镜表征了线粒体基因组所在的区域。
Mitochondrial organelles need to be replicated during cell division. Many aspects of this process have been studied in great detail, however the actual size increase and the position of organelle growth are less well understood. We use the protozoan parasite Trypanosoma brucei that contains a single mitochondrion to study organelle biogenesis by fluorescence microscopy. From the analysis of more than 1000 T. brucei bloodstream form cells of a nonsynchronous population we conclude that the mitochondrial network mostly grows from two areas along the main organelle axis, posterior and anterior of the nucleus. Loops and branches from these two areas eventually fuse to build a complex network. Together with the appearance of the division fold in the posterior part of the cell, pruning of the mitochondrial network and finally separation into the two daughter cells occurs. Overall organelle biogenesis is not continuous during cell growth and occurs mostly in the last part of the cell cycle. Furthermore, using 3D STED super resolution microscopy we reconstruct the volume of the organelle and characterize the region where the mitochondrial genome is positioned by serial block face scanning electron microscopy.
具有DNA特性的室内纤维。 I.固定和电子染色反应。
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