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Bryophyte spermiogenesis occurs through multimode autophagic and nonautophagic degradation

View ORCID ProfileTakuya Norizuki, View ORCID ProfileNaoki Minamino, View ORCID ProfileHirokazu Tsukaya, View ORCID ProfileTakashi Ueda
doi: https://doi.org/10.1101/2021.08.17.456730
Takuya Norizuki
1Division of Cellular Dynamics, National Institute for Basic Biology, Okazaki, Aichi, Japan
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Naoki Minamino
1Division of Cellular Dynamics, National Institute for Basic Biology, Okazaki, Aichi, Japan
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Hirokazu Tsukaya
2Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
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Takashi Ueda
1Division of Cellular Dynamics, National Institute for Basic Biology, Okazaki, Aichi, Japan
3Department of Basic Biology, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi, Japan
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  • For correspondence: tueda@nibb.ac.jp
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SUMMARY

Mitochondria change their morphology in response to developmental and environmental cues. During sexual reproduction, bryophytes produce spermatozoids with two mitochondria in the cell body. Although intensive morphological analyses have been conducted thus far, how this fixed number of mitochondria is realized remains unknown. Here, we investigated how mitochondria are reorganized during spermiogenesis in Marchantia polymorpha. We found that the mitochondrial number is reduced to one through fission followed by autophagic degradation during early spermiogenesis, and then the posterior mitochondrion arises by fission of the anterior mitochondrion. Autophagy is also responsible for the removal of other organelles, including peroxisomes, but these other organelles are removed at distinct developmental stages from mitochondrial degradation. We also found that spermiogenesis involves nonautophagic organelle degradation. Our findings highlight the dynamic reorganization of mitochondria, which is regulated distinctly from that of other organelles, and multiple degradation mechanisms operate in organelle remodeling during spermiogenesis in M. polymorpha.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted August 29, 2021.
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Bryophyte spermiogenesis occurs through multimode autophagic and nonautophagic degradation
Takuya Norizuki, Naoki Minamino, Hirokazu Tsukaya, Takashi Ueda
bioRxiv 2021.08.17.456730; doi: https://doi.org/10.1101/2021.08.17.456730
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Bryophyte spermiogenesis occurs through multimode autophagic and nonautophagic degradation
Takuya Norizuki, Naoki Minamino, Hirokazu Tsukaya, Takashi Ueda
bioRxiv 2021.08.17.456730; doi: https://doi.org/10.1101/2021.08.17.456730

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