Kinetics and specificity of paternal mitochondrial elimination in Caenorhabditis elegans.

Kinetics and specificity of paternal mitochondrial elimination in Caenorhabditis elegans.
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DOI:
10.1038/ncomms12569
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发表时间:
2016-09-01
影响因子:
16.6
通讯作者:
Xue, Ding
Xue, Ding
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang, Yang;Zhang, Yi;Chen, Lianwan;Liang, Qian;Yin, Xiao-Ming;Miao, Long;Kang, Byung-Ho;Xue, Ding

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In most eukaryotes, mitochondria are inherited maternally. The autophagy process is critical for paternal mitochondrial elimination (PME) in Caenorhabditis elegans, but how paternal mitochondria, but not maternal mitochondria, are selectively targeted for degradation is poorly understood. Here we report that mitochondrial dynamics have a profound effect on PME. A defect in fission of paternal mitochondria delays PME, whereas a defect in fusion of paternal mitochondria accelerates PME. Surprisingly, a defect in maternal mitochondrial fusion delays PME, which is reversed by a fission defect in maternal mitochondria or by increasing maternal mitochondrial membrane potential using oligomycin. Electron microscopy and tomography analyses reveal that a proportion of maternal mitochondria are compromised when they fail to fuse normally, leading to their competition for the autophagy machinery with damaged paternal mitochondria and delayed PME. Our study indicates that mitochondrial dynamics play a critical role in regulating both the kinetics and the specificity of PME. Autophagy mediates the degradation of paternal mitochondria after fertilization in C. elegans to ensure that mitochondria are inherited maternally. Here the authors show that mitochondrial dynamics is critical for the selectivity and kinetics of paternal mitochondrial elimination.
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