担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.11358/biogeo.24.79

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Herpetological Society of Japan  

DOI： 10.5358/hsj.41.196

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

Abstract

Blindsnakes of infraoder Scolecophidia (order Squamata) are the most basal group of extant snakes, comprising of more than 450 species with ecological and morphological features highly specialized to underground living. The Brahminy blindsnake, Indotyphlops braminus, is the only known obligate parthenogenetic species of snakes. Although the origin of I. braminus is thought to be South Asia, this snake has attracted worldwide attention as an alien species, as it has been introduced to all continents except Antarctica. In this study, we present the first draft genome assembly and annotation of I. braminus. We generated approximately 480 Gbp of sequencing data and produced a draft genome with a total length of 1.86 Gbp and N50 scaffold size of 1.25 Mbp containing 89.3% of orthologs conserved in Sauropsida. We also identified 0.98 Gbp (52.82%) of repetitive genome sequences and a total of 23,560 protein-coding genes. The first draft genome of I. braminus will facilitate further study of snake evolution as well as help to understand the emergence mechanism of parthenogenetic vertebrates.

DOI： 10.1038/s41597-022-01530-z

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その他リンク： https://www.nature.com/articles/s41597-022-01530-z

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press ({OUP})  

<jats:title>Abstract</jats:title>
<jats:p>Horizontal transfer (HT) of genes between multicellular animals, once thought to be extremely rare, is being more commonly detected, but its global geographic trend and transfer mechanism have not been investigated. We discovered a unique HT pattern of Bovine-B (BovB) LINE retrotransposons in vertebrates, with a bizarre transfer direction from predators (snakes) to their prey (frogs). At least 54 instances of BovB HT were detected, which we estimate to have occurred across time between 85 and 1.3 Ma. Using comprehensive transcontinental sampling, our study demonstrates that BovB HT is highly prevalent in one geographical region, Madagascar, suggesting important regional differences in the occurrence of HTs. We discovered parasite vectors that may plausibly transmit BovB and found that the proportion of BovB-positive parasites is also high in Madagascar where BovB thus might be physically transported by parasites to diverse vertebrates, potentially including humans. Remarkably, in two frog lineages, BovB HT occurred after migration from a non-HT area (Africa) to the HT hotspot (Madagascar). These results provide a novel perspective on how the prevalence of parasites influences the occurrence of HT in a region, similar to pathogens and their vectors in some endemic diseases.</jats:p>

DOI： 10.1093/molbev/msac052

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Informa {UK} Limited  

The complete sequence of the mitochondrial genome (mitogenome) of Tachysurus nudiceps (family Bagridae; order Siluriformes) was determined using next-generation sequencing. The composition of its mitogenome is the same as that observed in most other vertebrates and consists of 37 genes, an L-strand replication origin and a control region. As in previous studies, our phylogenetic analyses revealed that many of the bagrid genera are not monophyletic, emphasizing the necessity for reviewing and revising the taxonomy of this family at the genus level.

DOI： 10.1080/23802359.2022.2057253

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Pleiades Publishing Ltd  

DOI： 10.1134/s0032945222020072

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その他リンク： https://link.springer.com/article/10.1134/S0032945222020072/fulltext.html

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Biological Society of Washington  

DOI： 10.2988/20-00003

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：HINDAWI LTD  

The mitochondrial (mt) genome of the bushveld rain frog (Breviceps adspersus, Brevicipitidae, Afrobatrachia) is the largest (28.8 kbp) among the vertebrates investigated to date. The major cause of genome size enlargement in this species is the duplication of multiple genomic regions. To investigate the evolutionary lineage, timing, and process of mt genome enlargement, we sequenced the complete mtDNAs of two congeneric rain frogs, B. mossambicus and B. poweri. The mt genomic organization, gene content, and gene arrangements of these two rain frogs are very similar to each other but differ from those of B. adspersus. The B. mossambicus mt genome (22.5 kbp) does not differ significantly from that of most other afrobatrachians. In contrast, the B. poweri mtDNA (28.1 kbp) is considerably larger: currently the second largest among vertebrates, after B. adspersus. The main causes of genome enlargement differ among Breviceps species. Unusual elongation (12.5 kbp) of the control region (CR), a single major noncoding region of the vertebrate mt genome, is responsible for the extremely large mt genome in B. poweri. Based on the current Breviceps phylogeny and estimated divergence age, it can be concluded that the genome enlargements occurred independently in each species lineage within relatively short periods. Furthermore, a high nucleotide substitution rate and relaxation of selective pressures, which are considered to be involved in changes in genome size, were also detected in afrobatrachian lineages. Our results suggest that these factors were not direct causes but may have indirectly affected mt genome enlargements in Breviceps.

DOI： 10.1155/2020/6540343

Web of Science

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media {LLC}  

DOI： 10.1007/s00436-018-6141-y

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.15027/34533

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.15027/45330

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担当区分：筆頭著者,　責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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担当区分：筆頭著者   記述言語：日本語   出版者・発行元：広島大学総合博物館  

広島大学東広島キャンパスにおける両生類相の把握を目的として，2015年4月から2016年4月にかけてルートセンサス法による調査を行った。本調査では2目7科10種の両生類が確認され，うち5種（カスミサンショウウオ，アカハライモリ，ニホンヒキガエル，ニホンアカガエル，トノサマガエル）は広島県のRDB掲載種であった。区域ごとに出現する種は異なったが，その多くでウシガエルやアメリカザリガニ等の外来生物が確認され，在来生態系への影響が懸念される結果となった。We conducted a yearlong route census to survey amphibian fauna in the Higashi-Hiroshima campus of Hiroshima University from April 2015 to April 2016. A total of 2 orders, 7 families, and 10 species were recorded in this survey; 5 species (Hynobius nebulosus, Cynopus pyrrhogaster, Bufo japonicus japonicus, Rana japonica, Pelophylax nigromaculatus) were listed in the Red Data Book of Hiroshima Prefecture. Although species compositions were distinct for each area, alien species such as Lithobates catesbeianus or Procambarus clarkii were observed in many areas, so there is concern that these alien species may have a negative impact on the native ecosystem.

DOI： 10.15027/43823

CiNii Article

CiNii Books

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その他リンク： http://ir.lib.hiroshima-u.ac.jp/00043823

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