Synthesis and cloning of long repeat sequences using single-stranded circular DNA

Frontiers in Bioengineering and Biotechnology

Bioengineering and Biotechnology

Afsana Bhuiyan¹  Shuichi Asakawa² 

[1] Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan;null;

关键词: repeat sequence;    cell-free synthetic biology;    in vitro cloning;    neurodegenerative diseasaes;    spinocerebellar ataxia (SCA) 31;    benign adult familial myoclonic epilepsy (BAFME);   

DOI  :  10.3389/fbioe.2023.1115159

 received in 2022-12-03, accepted in 2023-02-27,  发布年份 2023

来源: Frontiers

【 摘 要 】

Non-coding repeat expansion causes several neurodegenerative diseases, such as fragile X syndrome, amyotrophic lateral sclerosis/frontotemporal dementia, and spinocerebellar ataxia (SCA31). Such repetitive sequences must be investigated to understand disease mechanisms and prevent them, using novel approaches. However, synthesizing repeat sequences from synthetic oligonucleotides is challenging as they are unstable, lack unique sequences, and exhibit propensity to make secondary structures. Synthesizing long repeat sequence using polymerase chain reaction is often difficult due to lack of unique sequence. Here, we employed a rolling circle amplification technique to obtain seamless long repeat sequences using tiny synthetic single-stranded circular DNA as template. We obtained 2.5–3 kbp uninterrupted TGGAA repeats, which is observed in SCA31, and confirmed it using restriction digestion, Sanger and Nanopore sequencing. This cell-free, in vitro cloning method may be applicable for other repeat expansion diseases and be used to produce animal and cell culture models to study repeat expansion diseases in vivo and in vitro.

【 授权许可】

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Copyright © 2023 Bhuiyan and Asakawa.