Bộ gen ty thể thực vật là một câu đố gói trong một bí ẩn bên trong một điều kỳ diệu

Journal of Molecular Evolution - Tập 89 - Trang 151-156 - 2021
Alan C. Christensen1
1School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, USA

Tóm tắt

Một nghịch lý cơ bản thúc đẩy nghiên cứu về bộ gen ty thể thực vật: tỷ lệ đột biến rất thấp (thấp hơn cả trong nhân) nhưng tỷ lệ tái sắp xếp lại cao. Một bài báo mang tính bước ngoặt được công bố trong Tạp chí Tiến hóa Phân tử vào năm 1988 đã thiết lập những sự thật này và chỉ ra nghịch lý. Jeffrey Palmer và Laura Herbon đã thực hiện một khối lượng công việc lớn trong kỷ nguyên trước khi giải trình tự gen để xác định cả tần suất cao của các sự tái sắp xếp giữa các loài có quan hệ gần gũi, và tần suất đột biến thấp, những quan sát hiện đã được xác nhận nhiều lần thông qua giải trình tự. Bài báo này cũng là bài đầu tiên sử dụng dữ liệu phân tử về các sự tái sắp xếp như một đặc trưng phân loại để xây dựng một cây phát sinh loài tối giản. Công trình này là một kỳ công kỹ thuật, những phát hiện của nó vẫn giữ vai trò trung tâm trong bộ gen ty thể thực vật, và các cơ chế phân tử cơ bản tạo ra nghịch lý này vẫn chưa hoàn toàn được hiểu rõ.

Từ khóa

#ty thể thực vật #bộ gen #đột biến #tái sắp xếp #phi sinh học

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