Lee NCO, Kim JH, Petrov NS, Lee HS, Masumoto H, Earnshaw WC, Larionov V, Kouprina N. Method to Assemble Genomic DNA Fragments or Genes on Human Artificial Chromosome with Regulated Kinetochore Using a Multi-Integrase System.
ACS Synth Biol 2018;
7:63-74. [PMID:
28799737 PMCID:
PMC5778389 DOI:
10.1021/acssynbio.7b00209]
[Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
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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, ΦC31 and ΦBT1, and combined it with a human artificial
chromosome (HAC) possessing a regulated kinetochore (alphoidtetO-HAC). We have demonstrated that the IIS-alphoidtetO-HAC
system is a valuable genetic tool by reassembling a functional gene
from multiple segments on the HAC. IIS-alphoidtetO-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 IIS-alphoidtetO-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, IIS-alphoidtetO-HAC 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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