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13. Incomplete activation ofAlyrefandGabpb1leads to preimplantation arrest in cloned mouse embryos

Author

Ihashi, Shunya, primary, Hamanaka, Mizuto, additional, Kaji, Masaya, additional, Mori, Ryunosuke, additional, Nishizaki, Shuntaro, additional, Mori, Miki, additional, Imasato, Yuma, additional, Inoue, Kimiko, additional, Matoba, Shogo, additional, Ogonuki, Narumi, additional, Takasu, Atsushi, additional, Nakamura, Misaki, additional, Matsumoto, Kazuya, additional, Anzai, Masayuki, additional, Ogura, Atsuo, additional, Ikawa, Masahito, additional, and Miyamoto, Kei, additional

Published
2023
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16. Signs of biological activities of 28,000-year-old mammoth nuclei in mouse oocytes visualized by live-cell imaging

Author

Yamagata, Kazuo, Nagai, Kouhei, Miyamoto, Hiroshi, Anzai, Masayuki, Kato, Hiromi, Miyamoto, Kei, Kurosaka, Satoshi, Azuma, Rika, Kolodeznikov, Igor I., Protopopov, Albert V., Plotnikov, Valerii V., Kobayashi, Hisato, Kawahara-Miki, Ryouka, Kono, Tomohiro, Uchida, Masao, Shibata, Yasuyuki, Handa, Tetsuya, Kimura, Hiroshi, Hosoi, Yoshihiko, Mitani, Tasuku, Matsumoto, Kazuya, and Iritani, Akira

Published
2019
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20. First distributional record of Parascolopsis akatamae Miyamoto, McMahan, & Kaneko, 2020, a dwarf monocle bream (Perciformes, Nemipteridae), from Indian waters

Author

Mahadevan, Gopalan, Murugesan, Perumal, Sreekanth, Giri Bhavan, Miyamoto, Kei, and McMahan, Caleb D.

Subjects
Fish, species report, India, marine, Parangipettai
Abstract

New records of Parascolopsis akatamae Miyamoto, McMahan, & Kaneko, 2020 are reported from India’s southeast coast. Three specimens were collected in April 2021 on the Parangipettai coast, Tamil Nadu, India. We examined and compared morphometric and meristic characters of our specimens with published data from the holotype. The new India records expand the known distribution of P. akatamae, which had previously been reported from southern Japan, Taiwan, Indonesia, and Thailand. Parascolopsis akatamae is a new addition to the list of marine fishes from Indian coastal waters.

Published
2022

24. 沖縄島から採集された飼育個体に基づくアダヒメオコゼ（新称）(Synanceiidae: Minoinae) の2番目の記録

Author

Miyamoto, Kei, Matsunuma, Mizuki, Takano, Haruka, Hanahara, Nozomi, and Matsuzaki, Syohei

Abstract

A single individual of Minous groeneveldi Matsunuma & Motomura, 2018 (75.3 mm standard length) was collected from Okinawa-jima Island, southern Japan, and is being reared at the Okinawa Churaumi Aquarium (as of 10 Mar. 2021). No record of this species is known other than the original description, which was based only on the holotype and underwater photographs from Indonesia. This is the second record of the species, which provides additional information regarding the morphology, distribution, and ecology of this species., 沖縄県安田沖よりフサカサゴ科のMinous groeneveldi Matsunuma & Motomura, 2018が1個体採集され, 2021年3月10日現在, 沖縄美ら海水族館で飼育されている. 本種はインドネシア産の1標本に基づき記載されたが，それ以降報告のない稀種である. ここでは飼育個体の詳細な観察に基づき, その形態および飼育下で観察された生態を記載する. これは本種の2番目の記録であると同時に日本海域からの初記録であるため, 新標準和名“アダヒメオコゼ”を提唱する., 論文

Published
2021

25. Genetic traits of the weatherfish Misgurnus sp. OK on the Okinawa Islands, southern Japan

Author

Oka, Shin-ichiro, Sasai, Takahide, Hanahara, Nozomi, Miyamoto, Kei, Kobayashi, Hirozumi, Murata, Naofumi, and Maeda, Ken

Abstract

沖縄島北部, 屋我地島および与那国島で採集されたドジョウ属魚類について, ミトコンドリアDNA調節領域の塩基配列に基づく遺伝的特性を検討した. その結果, 沖縄島北部からはヒョウモンドジョウ Misgurnus sp. OKと判断される3ハプロタイプ, 与那国島からはこれとは異なる同種の1ハプロタイプが見出された. 沖縄島北部西岸の4地点は全て同一のハプロタイプに占められ, 遺伝的多様性が著しく失われた状態にあった. 一方で, 名護市の東岸のごく小規模な水路から得られたヒョウモンドジョウからは西岸のハプロタイプを含めた3ハプロタイプがほぼ同等の割合で検出され, 今回調べた中で遺伝的多様性を有する唯一の個体群であった. 沖縄島北部西岸に隣接する屋我地島の個体群は, これらと異なり中国や九州以北に生息するドジョウを起源とする可能性が極めて高く, 近隣のヒョウモンドジョウ個体群に対する遺伝的撹乱が懸念される., Specimens of weatherfish (genus Misgurnus) were collected from Okinawa, Yagaji and Yonaguni islands, Japan, to investigate their genetic variations based on mitochondrial DNA sequences (control region). Three and one haplotypes of Misgurnus sp. OK were identified from Okinawa Island and Yonaguni Island, respectively. All four sites on the west coast of Okinawa Island were dominated by a single haplotype, indicating a significant loss of genetic diversity among them. The highest genetic diversity was observed in a very small creek in eastern Nago, Okinawa Island, where three haplotypes co-occurred in nearly equal proportions. The population on Yagaji Island is likely to be introduced from M. anguillicaudatus in China or temperate Japan area. Genetic disturbances caused by this introduced population to the Okinawan native population are of concern., 論文

Published
2021

37. Northernmost Record of the Surgeonfish Acanthurus nigros (Teleostei: Acanthuridae) from Minamidaitojima Island, Southern Japan

Author

Hanahara, Nozomi, Miyamoto, Kei, and Oka, Shin-ichiro

Subjects
Coleoptera, Curculionidae, Insecta, Arthropoda, Animalia, Biodiversity, Taxonomy
Abstract

Hanahara, Nozomi, Miyamoto, Kei, Oka, Shin-ichiro (2021): Northernmost Record of the Surgeonfish Acanthurus nigros (Teleostei: Acanthuridae) from Minamidaitojima Island, Southern Japan. Species Diversity 26 (1): 43-47, DOI: 10.12782/specdiv.26.43, URL: http://dx.doi.org/10.12782/specdiv.26.43

Published
2021

38. Structural alteration of the nucleus for the reprogramming of gene expression.

Author

Tomikawa, Junko and Miyamoto, Kei

Subjects
*GENE expression, *NUCLEOCYTOPLASMIC interactions, *CELL nuclei, *GENETIC regulation, *SOMATIC cell nuclear transfer, *NUCLEAR membranes, *NUCLEAR matrix
Abstract

The regulation of gene expression is a critical process for establishing and maintaining cellular identity. Gene expression is controlled through a chromatin‐based mechanism in the nucleus of eukaryotic cells. Recent studies suggest that chromatin accessibility and the higher‐order structure of chromatin affect transcriptional outcome. This is especially evident when cells change their fate during development and nuclear reprogramming. Furthermore, non‐chromosomal contents of the cell nucleus, namely nucleoskeleton proteins, can also affect chromatin and nuclear structures, resulting in transcriptional alterations. Here, we review our current mechanistic understanding about how chromatin and nuclear structures impact transcription in the course of embryonic development, cellular differentiation and nuclear reprogramming, and also discuss unresolved questions that remain to be addressed in the field. [ABSTRACT FROM AUTHOR]

Published
2022
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41. Ectopic gas in the fibular graft after anterior cervical corpectomy and fusion

Author

Nozawa, Satoshi, primary, Kato, Hiroki, additional, Kawaguchi, Masaya, additional, Nozawa, Asae, additional, Iwai, Chizuo, additional, Fushimi, Kazunari, additional, Miyamoto, Kei, additional, Hosoe, Hideo, additional, Shimizu, Katsuji, additional, Matsuo, Masayuki, additional, Akiyama, Haruhiko, additional, and Yamada, Kazunari, additional

Published
2021
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43. Symmetrically dimethylated histone H3R2 promotes global transcription during minor zygotic genome activation in mouse pronuclei

Author

50251450, Morita, Kohtaro, Hatanaka, Yuki, Ihashi, Shunya, Asano, Masahide, Miyamoto, Kei, Matsumoto, Kazuya, 50251450, Morita, Kohtaro, Hatanaka, Yuki, Ihashi, Shunya, Asano, Masahide, Miyamoto, Kei, and Matsumoto, Kazuya

Abstract

Paternal genome reprogramming, such as protamine–histone exchange and global DNA demethylation, is crucial for the development of fertilised embryos. Previously, our study showed that one of histone arginine methylation, asymmetrically dimethylated histone H3R17 (H3R17me2a), is necessary for epigenetic reprogramming in the mouse paternal genome. However, roles of histone arginine methylation in reprogramming after fertilisation are still poorly understood. Here, we report that H3R2me2s promotes global transcription at the 1-cell stage, referred to as minor zygotic genome activation (ZGA). The inhibition of H3R2me2s by expressing a histone H3.3 mutant H3.3R2A prevented embryonic development from the 2-cell to 4-cell stages and significantly reduced global RNA synthesis and RNA polymerase II (Pol II) activity. Consistent with this result, the expression levels of MuERV-L as minor ZGA transcripts were decreased by forced expression of H3.3R2A. Furthermore, treatment with an inhibitor and co-injection of siRNA to PRMT5 and PRMT7 also resulted in the attenuation of transcriptional activities with reduction of H3R2me2s in the pronuclei of zygotes. Interestingly, impairment of H3K4 methylation by expression of H3.3K4M resulted in a decrease of H3R2me2s in male pronuclei. Our findings suggest that H3R2me2s together with H3K4 methylation is involved in global transcription during minor ZGA in mice.

Published
2021

44. Improved development of mouse somatic cell nuclear transfer embryos by chlamydocin analogues, class I and IIa histone deacetylase inhibitors

Author

Satoshi, Kamimura, Inoue, Kimiko, Mizutani, Eiji, Jin-Moon, Kim, Inoue, Hiroki, Ogonuki, Narumi, Miyamoto, Kei, Ihashi, Shunya, Itami, Nobuhiko, Wakayama, Teruhiko, Ito, Akihiro, Nishino, Norikazu, Yoshida, Minoru, Ogura, Atsuo, Satoshi, Kamimura, Inoue, Kimiko, Mizutani, Eiji, Jin-Moon, Kim, Inoue, Hiroki, Ogonuki, Narumi, Miyamoto, Kei, Ihashi, Shunya, Itami, Nobuhiko, Wakayama, Teruhiko, Ito, Akihiro, Nishino, Norikazu, Yoshida, Minoru, and Ogura, Atsuo

Abstract

In mammalian cloning by somatic cell nuclear transfer (SCNT), the treatment of reconstructed embryos with histone deacetylase (HDAC) inhibitors improves efficiency. So far, most of those used for SCNT are hydroxamic acid derivatives—such as trichostatin A—characterized by their broad inhibitory spectrum. Here, we examined whether mouse SCNT efficiency could be improved using chlamydocin analogues, a family of newly designed agents that specifically inhibit class I and IIa HDACs. Development of SCNT-derived embryos in vitro and in vivo revealed that four out of five chlamydocin analogues tested could promote the development of cloned embryos. The highest pup rates (7.1–7.2%) were obtained with Ky-9, similar to those achieved with trichostatin A (7.2–7.3%). Thus, inhibition of class I and/or IIa HDACs in SCNT-derived embryos is enough for significant improvements in full-term development. In mouse SCNT, the exposure of reconstructed oocytes to HDAC inhibitors is limited to 8–10 h because longer inhibition with class I inhibitors causes a two-cell developmental block. Therefore, we used Ky-29, with higher selectivity for class IIa than class I HDACs for longer treatment of SCNT-derived embryos. As expected, 24-h treatment with Ky-29 up to the two-cell stage did not induce a developmental block, but the pup rate was not improved. This suggests that the one-cell stage is a critical period for improving SCNT cloning using HDAC inhibitors. Thus, chlamydocin analogues appear promising for understanding and improving the epigenetic status of mammalian SCNT-derived embryos through their specific inhibitory effects on HDACs.

Published
2021

46. Perioperative complications of anterior cervical decompression with fusion in patients with ossification of the posterior longitudinal ligament: a retrospective, multi-institutional study

Author

Kimura, Atsushi, Seichi, Atsushi, Hoshino, Yuichi, Yamazaki, Masashi, Mochizuki, Macondo, Aiba, Atsuomi, Kato, Tsuyoshi, Uchida, Kenzo, Miyamoto, Kei, Nakahara, Shinnosuke, Taniguchi, Shinichirou, Neo, Masashi, Taguchi, Toshihiko, Endo, Kenji, Watanabe, Masahiko, Takahashi, Masahito, Kaito, Takashi, Chikuda, Hirotaka, Fujimori, Takahito, Ito, Takui, Ono, Atsushi, Abumi, Kuniyoshi, Yamada, Kei, Nakagawa, Yukihiro, and Toyama, Yoshiaki

Published
2012
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