腺嘌呤鹼基編輯器可催化胞嘧啶轉化
作者:
小柯機器人發布時間:2019/9/24 15:33:53
韓國漢陽大學的Sangsu Bae研究組與首爾國立大學的Jin-Soo Kim研究組合作發現,腺嘌呤鹼基編輯器可催化人類細胞中的胞嘧啶轉化。相關論文2019年9月23日在線發表在《自然—生物技術》上。
研究人員發現,除了將腺嘌呤轉化為鳥嘌呤外,腺嘌呤鹼基編輯器還可以在狹窄的編輯窗口(5-7位鹼基)和受限的TC * N序列背景下將胞嘧啶轉化為鳥嘌呤或胸腺嘧啶。腺嘌呤鹼基編輯器引起的胞嘧啶改變不依賴於腺苷轉化而發生,其效率高達11.2%,並降低了可用於高特異性鹼基編輯合適靶向位點的數量。
研究人員介紹,腺嘌呤鹼基編輯器包含體外進化的腺苷脫氨酶和Cas9 核酸切口酶。
附:英文原文
Title: Adenine base editors catalyze cytosine conversions in human cells
Author: Heon Seok Kim, You Kyeong Jeong, Junho K Hur, Jin-Soo Kim, Sangsu Bae
Issue&Volume: 2019-09-23
Abstract:
Adenine base editors comprise an adenosine deaminase, evolved in vitro, and a Cas9 nickase. Here, we show that in addition to converting adenine to guanine, adenine base editors also convert cytosine to guanine or thymine in a narrow editing window (positions 5–7) and in a confined TC*N sequence context. Adenine base editor–induced cytosine substitutions occur independently of adenosine conversions with an efficiency of up to 11.2% and reduce the number of suitable targeting sites for high-specificity base editing.
DOI: 10.1038/s41587-019-0254-4
Source:https://www.nature.com/articles/s41587-019-0254-4