{"_buckets": {"deposit": "f03b42df-c2b2-4398-80f2-7d7128d3c2af"}, "_deposit": {"id": "4445", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "4445"}, "status": "published"}, "_oai": {"id": "oai:niigata-u.repo.nii.ac.jp:00004445", "sets": ["455", "564"]}, "item_6_alternative_title_1": {"attribute_name": "その他のタイトル", "attribute_value_mlt": [{"subitem_alternative_title": "ミトコンドリアDNAの変異からみたメダカ属魚類における遺伝子的多様性"}]}, "item_6_biblio_info_6": {"attribute_name": "書誌情報", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1997-03-25", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "113", "bibliographicPageStart": "1", "bibliographic_titles": [{}]}]}, "item_6_date_granted_51": {"attribute_name": "学位授与年月日", "attribute_value_mlt": [{"subitem_dategranted": "1997-03-25"}]}, "item_6_degree_grantor_49": {"attribute_name": "学位授与機関", "attribute_value_mlt": [{"subitem_degreegrantor": [{"subitem_degreegrantor_name": "新潟大学"}]}]}, "item_6_degree_name_48": {"attribute_name": "学位名", "attribute_value_mlt": [{"subitem_degreename": "博士（理学）"}]}, "item_6_description_4": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "Thre genus Oryzias is distributed from India to the Far East. Eleven species have been identified. Karyolooical analyses have demonstrated that the genus Oryzias has been  divided into three groups, the monoarmed, the biarmed, and the fused chromosome group. Biochemical analysis of enzyme polymorphisms within the genus Oryzias has provided support for these groupings. The biarmed chromosome group includes O. latipes, O. curvinotus, O. luzonensis, and O. mekongensis. Allozymic analysis demonstrate that four genetically distinct populations exist in the O. latipes; the Northern Population, the Southern Population, the East Korean Population, and the China-West Korean Population. The genetic diversity estimated among these four populations are large enough to be considered as characteristic of interspecific comparisons. Mitochondrial DNA (mtDNA) is a valuable molecule for understanding the evolutionary relationships among individuals, populations, and species, Mitochondrial DNA is inherited maternally and nonrecombine. The nucleotide of the genome substitute rapidly in contrast to the nuclear genome. The rate is about 1-2% sequence divergence per lineage per million years, or perhaps 5-10 times faster that typical single-copy nuclear DNA. In this study I investigated genetic diversity of Oryzias fishes based on mitochondrial DNA variation . The main objectives of the present study were to survey, mtDNA polymorphism in Japanese wild population of medaka, and to presume phylogenetic relationships among the species in the biarmed chromosome group. Tile phylogenetic reconstructions are based on a restriction fragment length polymorphisms (RFLPs) of mtDNA in Korean and Japanese population. To investigate the origin of the Japanese two populations of medaka, I compared nucleotide sequence of mitochondrial control region and cytochrome b gene of four species in the biarmed chromosome group. Basic results in the present study are as follows. (1) Mitochondrial DNAs of the Japanese wild population of medaka are divided into three clusters (A to C). Cluster B was subdivided into 11 subclusters. The average nucleotide diversities among these three clusters are 8.9% (A versus B), 8.4% (A versus C), and 7.3% (B versus C). Cluster C is miner cluster. (2) Mitochondrial DNAs of Korean wild population were separated into two clusters. The average nucleotide diversity between two clusters from Korea was 8.9%. (3) The distribution patterns of five clusters and subclusters in medaka revealed strong geographical associations. (4) Nucleotide sequences of complete mitochondrial control region from two Japanese populations have tandemly repeat sequence. (5) Oryzias mekongensis had no such a tandem repeat sequences in the control region, whereas other three species had a tandemly repeat sequences. (6) The phylogenetic analysis using nucleotide sequences of complete mitochondrial cytochrome b gene indicated monophyly of Japanese major two clusters. (7) A sister relationship between O. curvinotus and O. luzonensis is also indicated. The results of mtDNA analysis suggested a scenario of speciation process in the biarmed chromosome group and intraspecific relationships in O. latipes. Oryzias mekongensis had first diverged from a common ancestor of the biarmed chromosome group. Next, 0. curvinotus- O. luzonensis and O. latipes were separated. Next, in O. latipes, the China-West Korean Population, the East Korean Population, and Japanese populations was divided. In the time, O. curvinotus and O. luzonensis are separated. Finally, Japanese two population was separated into the Northern Population and the Southern Population.", "subitem_description_type": "Abstract"}]}, "item_6_description_5": {"attribute_name": "内容記述", "attribute_value_mlt": [{"subitem_description": "学位の種類: 博士（理学）. 報告番号: 甲第1270号. 学位記番号: 新大院博（理）甲第74号. 学位授与年月日: 平成9年3月25日", "subitem_description_type": "Other"}]}, "item_6_description_53": {"attribute_name": "学位記番号", "attribute_value_mlt": [{"subitem_description": "新大院博（理）甲第74号", "subitem_description_type": "Other"}]}, "item_6_dissertation_number_52": {"attribute_name": "学位授与番号", "attribute_value_mlt": [{"subitem_dissertationnumber": "13101A1270"}]}, "item_6_full_name_3": {"attribute_name": "著者別名", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "48458", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "松田, 勝"}]}]}, "item_6_publisher_7": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "新潟大学"}]}, "item_6_select_19": {"attribute_name": "著者版フラグ", "attribute_value_mlt": [{"subitem_select_item": "ETD"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Matsuda, Masaru"}], "nameIdentifiers": [{"nameIdentifier": "48457", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2019-08-05"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "000000311963.pdf", "filesize": [{"value": "11.2 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 11200000.0, "url": {"label": "本文", "url": "https://niigata-u.repo.nii.ac.jp/record/4445/files/000000311963.pdf"}, "version_id": "362de499-70e9-46a9-808b-6a69febd48c2"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "thesis", "resourceuri": "http://purl.org/coar/resource_type/c_46ec"}]}, "item_title": "Genetic diversity of Oryzias fishes based on mitochondrial DNA variation", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Genetic diversity of Oryzias fishes based on mitochondrial DNA variation"}, {"subitem_title": "Genetic diversity of Oryzias fishes based on mitochondrial DNA variation", "subitem_title_language": "en"}]}, "item_type_id": "6", "owner": "1", "path": ["455", "564"], "permalink_uri": "http://hdl.handle.net/10191/23773", "pubdate": {"attribute_name": "公開日", "attribute_value": "2013-10-10"}, "publish_date": "2013-10-10", "publish_status": "0", "recid": "4445", "relation": {}, "relation_version_is_last": true, "title": ["Genetic diversity of Oryzias fishes based on mitochondrial DNA variation"], "weko_shared_id": 2}