Synaptonemal complex analyses in the XY chromosomes of six taxa of Clethrionomys and Eothenomys from Japan.

• Iwasa Masahiro A.

  Department of Biofunctional Science, Faculty of Agriculture and Life Science, Hirosaki University

• Obara Yoshitaka

  Department of Biofunctional Science, Faculty of Agriculture and Life Science, Hirosaki University

• Kitahara Eiji

  Forestry and Forest Products Research Institute

• Kimura Yoshiyuki

  Faculty of Education, Fukushima University

抄録

The XY chromosomes of bone marrow metaphases and the XY-synapses of pachytene spermatocytes of six taxa of Clethrionomys and Eothenomys from Japan were examined using C-banding and surface-spreading techniques. Light, and electron, microscopy revealed that in the red-backed vole, the XY size ratios of the metaphase sex chromosomes and the SC-axes of pachytene XY-synapses show a similar pattern of variation. The X chromosomes of these vole taxa were classified, on the basis of their size and morphology, as one of two types, that is they were either acrocentric or sub-telocentric. Similarly, two types of Y chromosome, small and medium, were recorded. According to these criteria, C. rufocanus, C. rutilus and Eothenomys andersoni carry an acrocentric X chromosome and a small Y chromosome, whereas the two local forms of E. smithii, the so-called “smithii-type” and “kageus-type”, carry a subtelocentric X chromosome and a medium Y chromosome. In contrast to these XY combinations, E. imaizumii showed a composite combination, with a subtelocentric X chromosome and a small Y chromosome. In view of earlier findings on the genetic background of E. imaizumii (Suzuki 1994; Suzuki et al. 1999), such a composite combination of the sex chromosomes suggests that E. imaizumii may have inherited an X chromosome from a female E. smithii and a Y chromosome from a male E. andersoni during the course of speciation through hybridisation.

収録刊行物

• Mammal Study

  Mammal Study 24 (2), 103-113, 1999

  日本哺乳類学会

キーワード

• red-backed voles
• synaptonemal complex
• X chromosome
• Y chromosome

詳細情報

• CRID: 1390282679648114560
• NII論文ID: 130000886313
• NII書誌ID: AA11185060
• DOI: 10.3106/mammalstudy.24.103
• ISSN: 13486160
• ISSN: 13434152
• NDL書誌ID: 5356140
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5356140
• Web Site: https://www.jstage.jst.go.jp/article/mammalstudy/24/2/24_2_103/_pdf/-char/en
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可