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Measuring Sperm Guidance and Motility within the Caenorhabditis elegans Hermaphrodite Reproductive Tract
Published on: June 6, 2019
Kinetics and specificity of paternal mitochondrial elimination in Caenorhabditis elegans
Yang Wang1, Yi Zhang1, Lianwan Chen2
1School of Life Sciences and Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Tsinghua University, Beijing 100084, China.
Abstract:
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.
Insights
Mitochondrial dynamics regulate paternal mitochondrial elimination (PME). Defects in mitochondrial fusion or fission impact PME timing, revealing how mitochondria target damaged paternal organelles for autophagy.
Area of Science:
- Cell Biology
- Genetics
- Molecular Biology
Background:
- Maternal inheritance of mitochondria is common in eukaryotes.
- Autophagy is essential for eliminating paternal mitochondria (PME) in C. elegans.
- Mechanisms for selective targeting of paternal mitochondria for degradation are unclear.
Purpose of the Study:
- Investigate the role of mitochondrial dynamics in paternal mitochondrial elimination (PME).
- Determine how mitochondrial fission and fusion affect the selective degradation of paternal mitochondria.
Main Methods:
- Utilized Caenorhabditis elegans as a model organism.
- Employed genetic manipulation to create defects in mitochondrial fission and fusion.
- Performed electron microscopy and tomography for ultrastructural analysis.
Main Results:
- Impaired paternal mitochondrial fission delayed PME; impaired fusion accelerated PME.
- Defects in maternal mitochondrial fusion delayed PME, a phenotype rescued by maternal fission defects or increased mitochondrial membrane potential.
- Compromised maternal mitochondria compete with damaged paternal mitochondria for autophagy, affecting PME kinetics and specificity.
Conclusions:
- Mitochondrial dynamics critically regulate the timing and selectivity of paternal mitochondrial elimination.
- Maternal mitochondrial health and dynamics influence the efficiency of paternal mitochondrial clearance.
- Understanding mitochondrial dynamics offers insights into selective organelle turnover and inheritance.
