Ý nghĩa tiến hóa của biến đổi nhiễm sắc thể ở loài chuột đồng có lưng đỏ ở Đông Bắc Á được suy luận từ các trình tự intron 1 của gen G6pd

Masahiro A. Iwasa1, Hitoshi Suzuki1
1Laboratory of Ecology and Genetics, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido, Japan

Tóm tắt

Để đánh giá ý nghĩa tiến hóa của các đặc điểm karyotyp trong loài chuột đồng có lưng đỏ (Rodentia, Arvicolinae, các chi Clethrionomys và Eothenomys) từ Đông Bắc Á, chúng tôi đã xây dựng các cây phát sinh chủng loại dựa trên các trình tự intron 1 (khoảng 580 bp) của gen G6pd nối với X. Các cây phát sinh chủng loại, được xây dựng bằng phương pháp hàng xóm-giao nhau và phương pháp khả năng tối đa, đã tiết lộ hai nhánh chính trong loài chuột đồng có lưng đỏ tương ứng với các cytotype glareolus và rufocanus được định nghĩa bởi sự chuyển vị đối xứng giữa nhiễm sắc thể 1 và 9 dựa trên mẫu G-band. Nếu được xác nhận, hai loại nhiễm sắc thể X, X acrocentric và X subtelocentric, mà thường được cho là những đặc điểm có ý nghĩa tiến hóa và phân loại, nên được xem xét như là ví dụ về đồng hình (homoplasy) vì chúng xảy ra rải rác ở cả hai nhánh cytotype rufocanus và glareolus trong loài chuột đồng có lưng đỏ.

Từ khóa

#tiến hóa #biến đổi nhiễm sắc thể #chuột đồng có lưng đỏ #cytotype #homoplasy

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