期刊
ACS SYNTHETIC BIOLOGY
卷 7, 期 1, 页码 63-74出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssynbio.7b00209
关键词
human artificial chromosome; HAC; iterative integration system; IIS; DNA assembly; synthetic biology
资金
- NIH, National Cancer Institute, Center for Cancer Research, USA
- Wellcome Trust Principal Research Fellowship [107022]
- MEXT KAKENHI [16H04747, 16H01414]
- Kazusa DNA Research Institute Foundation
- NATIONAL CANCER INSTITUTE [ZICBC011574, ZIABC010413] Funding Source: NIH RePORTER
The production of cells capable of carrying multiple transgenes to Mb-size genomic loci has multiple applications in biomedicine and biotechnology. In order to achieve this goal, three key steps are required: (i) cloning of large genomic segments; (ii) insertion of multiple DNA blocks at a precise location and (iii) the capability to eliminate the assembled region from cells. In this study, we designed the iterative integration system (IIS) that utilizes recombinases Cre, Phi C31 and Phi BT1, and combined it with a human artificial chromosome (HAC) possessing a regulated kinetochore (alphoid(tetO)-HAC). We have demonstrated that the IIS-alphoid(tetO)-HAC system is a valuable genetic tool by reassembling a functional gene from multiple segments on the HAC. alphoid(tetO)-HAC has several notable advantages over other artificial chromosome-based systems. This includes the potential to assemble an unlimited number of genomic DNA segments; a DNA assembly process that leaves only a small insertion (<60 bp) scar between adjacent DNA, allowing genes reassembled from segments to be spliced correctly; a marker exchange system that also changes cell color, and counter-selection markers at each DNA insertion step, simplifying selection of correct clones; and presence of an error proofing mechanism to remove cells with misincorporated DNA segments, which improves the integrity of assembly. In addition, the alphoid(tetO)-HAC carrying a locus of interest is removable, offering the unique possibility to revert the cell line to its pretransformed state and compare the phenotypes of human cells with and without a functional copy of a gene(s). Thus, alphoid(tetO) allows investigation of complex biomedical pathways, gene(s) regulation, and has the potential to engineer synthetic chromosomes with a predetermined set of genes.
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