1
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Centromere identity and function put to use: construction and transfer of mammalian artificial chromosomes to animal models. Essays Biochem 2021; 64:185-192. [PMID: 32501473 DOI: 10.1042/ebc20190071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/14/2020] [Accepted: 05/18/2020] [Indexed: 12/25/2022]
Abstract
Mammalian artificial chromosomes (MACs) are widely used as gene expression vectors and have various advantages over conventional expression vectors. We review and discuss breakthroughs in MAC construction, initiation of functional centromeres allowing their faithful inheritance, and transfer from cell culture to animal model systems. These advances have contributed to advancements in synthetic biology, biomedical research, and applications in industry and in the clinic.
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2
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Ohzeki JI, Otake K, Masumoto H. Human artificial chromosome: Chromatin assembly mechanisms and CENP-B. Exp Cell Res 2020; 389:111900. [PMID: 32044309 DOI: 10.1016/j.yexcr.2020.111900] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/04/2020] [Accepted: 02/07/2020] [Indexed: 12/12/2022]
Abstract
The centromere is a specialized chromosomal locus required for accurate chromosome segregation. Heterochromatin also assembles around centromere chromatin and forms a base that supports sister chromatid cohesion until anaphase begins. Both centromere chromatin and heterochromatin assemble on a centromeric DNA sequence, a highly repetitive sequence called alphoid DNA (α-satellite DNA) in humans. Alphoid DNA can form a de novo centromere and subsequent human artificial chromosome (HAC) when introduced into the human culture cells HT1080. HAC is maintained stably as a single chromosome independent of other human chromosomes. For de novo centromere assembly and HAC formation, the centromere protein CENP-B and its binding sites, CENP-B boxes, are required in the repeating units of alphoid DNA. CENP-B has multiple roles in de novo centromere chromatin assembly and stabilization and in heterochromatin formation upon alphoid DNA introduction into the cells. Here we review recent progress in human artificial chromosome construction and centromere/heterochromatin assembly and maintenance, focusing on the involvement of human centromere DNA and CENP-B protein.
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Affiliation(s)
- Jun-Ichirou Ohzeki
- Laboratory of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, 292-0818, Japan
| | - Koichiro Otake
- Laboratory of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, 292-0818, Japan
| | - Hiroshi Masumoto
- Laboratory of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, 292-0818, Japan.
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3
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Ling YH, Lin Z, Yuen KWY. Genetic and epigenetic effects on centromere establishment. Chromosoma 2019; 129:1-24. [PMID: 31781852 DOI: 10.1007/s00412-019-00727-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 09/24/2019] [Accepted: 10/10/2019] [Indexed: 01/19/2023]
Abstract
Endogenous chromosomes contain centromeres to direct equal chromosomal segregation in mitosis and meiosis. The location and function of existing centromeres is usually maintained through cell cycles and generations. Recent studies have investigated how the centromere-specific histone H3 variant CENP-A is assembled and replenished after DNA replication to epigenetically propagate the centromere identity. However, existing centromeres occasionally become inactivated, with or without change in underlying DNA sequences, or lost after chromosomal rearrangements, resulting in acentric chromosomes. New centromeres, known as neocentromeres, may form on ectopic, non-centromeric chromosomal regions to rescue acentric chromosomes from being lost, or form dicentric chromosomes if the original centromere is still active. In addition, de novo centromeres can form after chromatinization of purified DNA that is exogenously introduced into cells. Here, we review the phenomena of naturally occurring and experimentally induced new centromeres and summarize the genetic (DNA sequence) and epigenetic features of these new centromeres. We compare the characteristics of new and native centromeres to understand whether there are different requirements for centromere establishment and propagation. Based on our understanding of the mechanisms of new centromere formation, we discuss the perspectives of developing more stably segregating human artificial chromosomes to facilitate gene delivery in therapeutics and research.
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Affiliation(s)
- Yick Hin Ling
- School of Biological Sciences, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong
| | - Zhongyang Lin
- School of Biological Sciences, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong
| | - Karen Wing Yee Yuen
- School of Biological Sciences, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong.
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4
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Logsdon GA, Gambogi CW, Liskovykh MA, Barrey EJ, Larionov V, Miga KH, Heun P, Black BE. Human Artificial Chromosomes that Bypass Centromeric DNA. Cell 2019; 178:624-639.e19. [PMID: 31348889 PMCID: PMC6657561 DOI: 10.1016/j.cell.2019.06.006] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 04/07/2019] [Accepted: 06/03/2019] [Indexed: 11/29/2022]
Abstract
Recent breakthroughs with synthetic budding yeast chromosomes expedite the creation of synthetic mammalian chromosomes and genomes. Mammals, unlike budding yeast, depend on the histone H3 variant, CENP-A, to epigenetically specify the location of the centromere-the locus essential for chromosome segregation. Prior human artificial chromosomes (HACs) required large arrays of centromeric α-satellite repeats harboring binding sites for the DNA sequence-specific binding protein, CENP-B. We report the development of a type of HAC that functions independently of these constraints. Formed by an initial CENP-A nucleosome seeding strategy, a construct lacking repetitive centromeric DNA formed several self-sufficient HACs that showed no uptake of genomic DNA. In contrast to traditional α-satellite HAC formation, the non-repetitive construct can form functional HACs without CENP-B or initial CENP-A nucleosome seeding, revealing distinct paths to centromere formation for different DNA sequence types. Our developments streamline the construction and characterization of HACs to facilitate mammalian synthetic genome efforts.
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Affiliation(s)
- Glennis A Logsdon
- Department of Biochemistry and Biophysics, Graduate Program in Biochemistry and Molecular Biophysics, and Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Craig W Gambogi
- Department of Biochemistry and Biophysics, Graduate Program in Biochemistry and Molecular Biophysics, and Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Mikhail A Liskovykh
- Developmental Therapeutics Branch, National Cancer Institute, Bethesda, MD 20892, USA
| | - Evelyne J Barrey
- Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3BF, UK
| | - Vladimir Larionov
- Developmental Therapeutics Branch, National Cancer Institute, Bethesda, MD 20892, USA
| | - Karen H Miga
- Center for Biomolecular Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Patrick Heun
- Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3BF, UK
| | - Ben E Black
- Department of Biochemistry and Biophysics, Graduate Program in Biochemistry and Molecular Biophysics, and Epigenetics Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
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5
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Ohzeki J, Larionov V, Earnshaw WC, Masumoto H. De novo formation and epigenetic maintenance of centromere chromatin. Curr Opin Cell Biol 2019; 58:15-25. [PMID: 30654232 DOI: 10.1016/j.ceb.2018.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 11/30/2018] [Accepted: 12/07/2018] [Indexed: 12/12/2022]
Abstract
Accurate chromosome segregation is essential for cell proliferation. The centromere is a specialized chromosomal locus, on which the kinetochore structure is formed. The centromere/kinetochore is required for the equal separation of sister chromatids to daughter cells. Here, we review recent findings on centromere-specific chromatin, including its constitutive protein components, its de novo formation and maintenance mechanisms, and our progress in analyses with synthetic human artificial chromosomes (HACs).
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Affiliation(s)
- Junichirou Ohzeki
- Laboratory of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu 292-0818, Japan
| | - Vladimir Larionov
- Genome Structure and Function Group, Developmental Therapeutics Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - William C Earnshaw
- Wellcome Trust Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3BF, UK
| | - Hiroshi Masumoto
- Laboratory of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu 292-0818, Japan.
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6
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Kouprina N, Petrov N, Molina O, Liskovykh M, Pesenti E, Ohzeki JI, Masumoto H, Earnshaw WC, Larionov V. Human Artificial Chromosome with Regulated Centromere: A Tool for Genome and Cancer Studies. ACS Synth Biol 2018; 7:1974-1989. [PMID: 30075081 PMCID: PMC6154217 DOI: 10.1021/acssynbio.8b00230] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Since their description in the late 1990s, Human Artificial Chromosomes (HACs) bearing functional kinetochores have been considered as promising systems for gene delivery and expression. More recently a HAC assembled from a synthetic alphoid DNA array has been exploited in studies of centromeric chromatin and in assessing the impact of different epigenetic modifications on kinetochore structure and function in human cells. This HAC was termed the alphoidtetO-HAC, as the synthetic monomers each contained a tetO sequence in place of the CENP-B box that can be targeted specifically with tetR-fusion proteins. Studies in which the kinetochore chromatin of the alphoidtetO-HAC was specifically modified, revealed that heterochromatin is incompatible with centromere function and that centromeric transcription is important for centromere assembly and maintenance. In addition, the alphoidtetO-HAC was modified to carry large gene inserts that are expressed in target cells under conditions that recapitulate the physiological regulation of endogenous loci. Importantly, the phenotypes arising from stable gene expression can be reversed when cells are "cured" of the HAC by inactivating its kinetochore in proliferating cell populations, a feature that provides a control for phenotypic changes attributed to expression of HAC-encoded genes. AlphoidtetO-HAC-based technology has also been used to develop new drug screening and assessment strategies to manipulate the CIN phenotype in cancer cells. In summary, the alphoidtetO-HAC is proving to be a versatile tool for studying human chromosome transactions and structure as well as for genome and cancer studies.
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Affiliation(s)
- Natalay Kouprina
- Developmental
Therapeutics Branch, National Cancer Institute,
NIH, Bethesda, Maryland 20892, United
States,E-mail: . Tel: +1-240-760-7325
| | - Nikolai Petrov
- Developmental
Therapeutics Branch, National Cancer Institute,
NIH, Bethesda, Maryland 20892, United
States
| | - Oscar Molina
- Josep
Carreras Leukaemia Research Institute, School of Medicine, University
of Barcelona, Casanova 143, 08036 Barcelona, Spain
| | - Mikhail Liskovykh
- Developmental
Therapeutics Branch, National Cancer Institute,
NIH, Bethesda, Maryland 20892, United
States
| | - Elisa Pesenti
- Wellcome
Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3JR, Scotland
| | - Jun-ichirou Ohzeki
- Laboratory
of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, Kisarazu, Chiba 292-0818d Japan
| | - Hiroshi Masumoto
- Laboratory
of Chromosome Engineering, Department of Frontier Research and Development, Kazusa DNA Research Institute, Kisarazu, Chiba 292-0818d Japan,E-mail: . Tel: +81-438-52-395
| | - William C. Earnshaw
- Wellcome
Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3JR, Scotland,E-mail: . Tel: +44-(0)131-650-7101
| | - Vladimir Larionov
- Developmental
Therapeutics Branch, National Cancer Institute,
NIH, Bethesda, Maryland 20892, United
States,E-mail: . Tel: +1-240-760-7325
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7
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Pesenti E, Kouprina N, Liskovykh M, Aurich-Costa J, Larionov V, Masumoto H, Earnshaw WC, Molina O. Generation of a Synthetic Human Chromosome with Two Centromeric Domains for Advanced Epigenetic Engineering Studies. ACS Synth Biol 2018; 7:1116-1130. [PMID: 29565577 PMCID: PMC5951608 DOI: 10.1021/acssynbio.8b00018] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
It is generally accepted that chromatin containing the histone H3 variant CENP-A is an epigenetic mark maintaining centromere identity. However, the pathways leading to the formation and maintenance of centromere chromatin remain poorly characterized due to difficulties of analysis of centromeric repeats in native chromosomes. To address this problem, in our previous studies we generated a human artificial chromosome (HAC) whose centromere contains a synthetic alpha-satellite (alphoid) DNA array containing the tetracycline operator, the alphoidtetO-HAC. The presence of tetO sequences allows the specific targeting of the centromeric region in the HAC with different chromatin modifiers fused to the tetracycline repressor. The alphoidtetO-HAC has been extensively used to investigate protein interactions within the kinetochore and to define the epigenetic signature of centromeric chromatin to maintain a functional kinetochore. In this study, we developed a novel synthetic HAC containing two alphoid DNA arrays with different targeting sequences, tetO, lacO and gal4, the alphoidhybrid-HAC. This new HAC can be used for detailed epigenetic engineering studies because its kinetochore can be simultaneously or independently targeted by different chromatin modifiers and other fusion proteins.
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Affiliation(s)
- Elisa Pesenti
- Wellcome
Trust Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3QR, United
Kingdom
| | - Natalay Kouprina
- Genome
Structure and Function Group, Developmental Therapeutics Branch, National
Cancer Institute, National Institutes of
Health, Bethesda, Maryland 20892, United States
| | - Mikhail Liskovykh
- Genome
Structure and Function Group, Developmental Therapeutics Branch, National
Cancer Institute, National Institutes of
Health, Bethesda, Maryland 20892, United States
| | - Joan Aurich-Costa
- Research
and Development, Cellay Inc., Cambridge, Massachusetts 02139, United States
| | - Vladimir Larionov
- Genome
Structure and Function Group, Developmental Therapeutics Branch, National
Cancer Institute, National Institutes of
Health, Bethesda, Maryland 20892, United States
| | - Hiroshi Masumoto
- Laboratory
of Cell Engineering, Department of Frontier Research, Kazusa DNA Research Institute, Kisazaru 292-0818, Japan
| | - William C. Earnshaw
- Wellcome
Trust Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3QR, United
Kingdom,E-mail: ; tel: +34 93-557-2810
| | - Oscar Molina
- Wellcome
Trust Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3QR, United
Kingdom,Josep
Carreras Leukaemia Research Institute, School of Medicine, University of Barcelona, Casanova 143, 08036 Barcelona, Spain,E-mail: ; tel: +44-(0)131-650-7101
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8
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Using human artificial chromosomes to study centromere assembly and function. Chromosoma 2017; 126:559-575. [DOI: 10.1007/s00412-017-0633-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 06/12/2017] [Accepted: 06/13/2017] [Indexed: 12/13/2022]
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9
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Chen Q, Tan B, He JL, Liu XQ, Chen XM, Gao RF, Zhu J, Wang YX, Qi HB. Mutational spectrum of CENP-B box and α-satellite DNA on chromosome 21 in Down syndrome children. Mol Med Rep 2017; 15:2313-2317. [PMID: 28259924 DOI: 10.3892/mmr.2017.6247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 01/13/2017] [Indexed: 11/06/2022] Open
Abstract
The centromere is responsible for the correct inheritance of eukaryotic chromosomes during cell division. Centromere protein B (CENP‑B) and its 17 base pair binding site (CENP‑B box), which appears at regular intervals in centromeric α-satellite DNA (α-satDNA), are important for the assembly of the centromere components. Therefore, it is conceivable that CENP-B box mutations may induce errors in cell division. However, the association between the deoxynucleotide alterations of the CENP‑B box and the extra chromosome 21 (Chr21) present in patients with Down syndrome (DS) remains to be elucidated. The mutational spectrum of the α‑satDNA, including 4 functional CENP‑B boxes in Chr21 from 127 DS and 100 healthy children were analyzed by direct sequencing. The de novo occurrences of mutations within CENP‑B boxes in patients with DS were excluded. The prevalence of 6 novel mutations (g.661delC, g.1035_1036insA, g.1076_1077insC, g.670T>G, g.1239A>T, g.1343T>C) and 3 single nucleotide polymorphisms (g.727C/T, g.863A/C, g.1264C/G) were not significantly different between DS and controls (P>0.05). However, g.525C/G (P=0.01), g.601T/C (P=0.00000002), g.1279A/G (P=0.002), g.1294C/T (P=0.0006) and g.1302 G/T (P=0.004) were significantly associated with the prevalence of DS (P<0.05). The results indicated that CENP‑B boxes are highly conserved in DS patients and may not be responsible for Chr21 nondisjunction events. However, α‑satDNA in Chr21 is variable and deoxynucleotide deletions, mutations and polymorphisms may act as potential molecular diagnostic markers of DS.
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Affiliation(s)
- Qian Chen
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Bin Tan
- Pediatrics Research Institute, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing 400014, P.R. China
| | - Jun-Lin He
- Laboratory of Reproductive Biology, Public Health College, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Xue-Qing Liu
- Laboratory of Reproductive Biology, Public Health College, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Xue-Mei Chen
- Laboratory of Reproductive Biology, Public Health College, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Ru-Fei Gao
- Laboratory of Reproductive Biology, Public Health College, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Jing Zhu
- Pediatrics Research Institute, Children's Hospital of Chongqing Medical University, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing 400014, P.R. China
| | - Ying-Xiong Wang
- Laboratory of Reproductive Biology, Public Health College, Chongqing Medical University, Chongqing 400016, P.R. China
| | - Hong-Bo Qi
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
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10
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Miga KH. The Promises and Challenges of Genomic Studies of Human Centromeres. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2017; 56:285-304. [PMID: 28840242 DOI: 10.1007/978-3-319-58592-5_12] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Human centromeres are genomic regions that act as sites of kinetochore assembly to ensure proper chromosome segregation during mitosis and meiosis. Although the biological importance of centromeres in genome stability, and ultimately, cell viability are well understood, the complete sequence content and organization in these multi-megabase-sized regions remains unknown. The lack of a high-resolution reference assembly inhibits standard bioinformatics protocols, and as a result, sequence-based studies involving human centromeres lag far behind the advances made for the non-repetitive sequences in the human genome. In this chapter, I introduce what is known about the genomic organization in the highly repetitive regions spanning human centromeres, and discuss the challenges these sequences pose for assembly, alignment, and data interpretation. Overcoming these obstacles is expected to issue a new era for centromere genomics, which will offer new discoveries in basic cell biology and human biomedical research.
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Affiliation(s)
- Karen H Miga
- Center for Biomolecular Science and Engineering, University of California, Santa Cruz, CA, USA.
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11
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Barrey EJ, Heun P. Artificial Chromosomes and Strategies to Initiate Epigenetic Centromere Establishment. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2017; 56:193-212. [PMID: 28840238 DOI: 10.1007/978-3-319-58592-5_8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
In recent years, various synthetic approaches have been developed to address the question of what directs centromere establishment and maintenance. In this chapter, we will discuss how approaches aimed at constructing synthetic centromeres have co-evolved with and contributed to shape the theory describing the determinants of centromere identity. We will first review lessons learned from artificial chromosomes created from "naked" centromeric sequences to investigate the role of the underlying DNA for centromere formation. We will then discuss how several studies, which applied removal of endogenous centromeres or over-expression of the centromere-specific histone CENP-A, helped to investigate the contribution of chromatin context to centromere establishment. Finally, we will examine various biosynthetic approaches taking advantage of targeting specific proteins to ectopic sites in the genome to dissect the role of many centromere-associated proteins and chromatin modifiers for centromere inheritance and function. Together, these studies showed that chromatin context matters, particularly proximity to heterochromatin or repetitive DNA sequences. Moreover, despite the important contribution of centromeric DNA, the centromere-specific histone H3-variant CENP-A emerges as a key epigenetic mark to establish and maintain functional centromeres on artificial chromosomes or at ectopic sites of the genome.
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Affiliation(s)
- Evelyne J Barrey
- Wellcome Trust Centre for Cell Biology, The University of Edinburgh, Edinburgh, UK
| | - Patrick Heun
- Wellcome Trust Centre for Cell Biology, The University of Edinburgh, Edinburgh, UK.
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12
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Abstract
The enabling technologies of synthetic biology are opening up new opportunities for engineering and enhancement of mammalian cells. This will stimulate diverse applications in many life science sectors such as regenerative medicine, development of biosensing cell lines, therapeutic protein production, and generation of new synthetic genetic regulatory circuits. Harnessing the full potential of these new engineering-based approaches requires the design and assembly of large DNA constructs-potentially up to chromosome scale-and the effective delivery of these large DNA payloads to the host cell. Random integration of large transgenes, encoding therapeutic proteins or genetic circuits into host chromosomes, has several drawbacks such as risks of insertional mutagenesis, lack of control over transgene copy-number and position-specific effects; these can compromise the intended functioning of genetic circuits. The development of a system orthogonal to the endogenous genome is therefore beneficial. Mammalian artificial chromosomes (MACs) are functional, add-on chromosomal elements, which behave as normal chromosomes-being replicating and portioned to daughter cells at each cell division. They are deployed as useful gene expression vectors as they remain independent from the host genome. MACs are maintained as a single-copy and can accommodate multiple gene expression cassettes of, in theory, unlimited DNA size (MACs up to 10 megabases have been constructed). MACs therefore enabled control over ectopic gene expression and represent an excellent platform to rapidly prototype and characterize novel synthetic gene circuits without recourse to engineering the host genome. This review describes the obstacles synthetic biologists face when working with mammalian systems and how the development of improved MACs can overcome these-particularly given the spectacular advances in DNA synthesis and assembly that are fuelling this research area.
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Affiliation(s)
- Andrea Martella
- School of Biological Sciences, The University of Edinburgh , The King's Buildings, Edinburgh EH9 3BF, U.K
| | - Steven M Pollard
- MRC Centre for Regenerative Medicine, The University of Edinburgh , Edinburgh bioQuarter, 5 Little France Drive, Edinburgh, EH16 4UU, U.K
| | - Junbiao Dai
- Key Laboratory of Industrial Biocatalysis (Ministry of Education), Center for Synthetic and Systems Biology, School of Life Sciences, Tsinghua University , Beijing 100084, China
| | - Yizhi Cai
- School of Biological Sciences, The University of Edinburgh , The King's Buildings, Edinburgh EH9 3BF, U.K
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13
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Oshimura M, Uno N, Kazuki Y, Katoh M, Inoue T. A pathway from chromosome transfer to engineering resulting in human and mouse artificial chromosomes for a variety of applications to bio-medical challenges. Chromosome Res 2015; 23:111-33. [PMID: 25657031 PMCID: PMC4365188 DOI: 10.1007/s10577-014-9459-z] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Microcell-mediated chromosome transfer (MMCT) is a technique to transfer a chromosome from defined donor cells into recipient cells and to manipulate chromosomes as gene delivery vectors and open a new avenue in somatic cell genetics. However, it is difficult to uncover the function of a single specific gene via the transfer of an entire chromosome or fragment, because each chromosome or fragment contains a set of numerous genes. Thus, alternative tools are human artificial chromosome (HAC) and mouse artificial chromosome (MAC) vectors, which can carry a gene or genes of interest. HACs/MACs have been generated mainly by either a "top-down approach" (engineered creation) or a "bottom-up approach" (de novo creation). HACs/MACs with one or more acceptor sites exhibit several characteristics required by an ideal gene delivery vector, including stable episomal maintenance and the capacity to carry large genomic loci plus their regulatory elements, thus allowing the physiological regulation of the introduced gene in a manner similar to that of native chromosomes. The MMCT technique is also applied for manipulating HACs and MACs in donor cells and delivering them to recipient cells. This review describes the lessons learned and prospects identified from studies on the construction of HACs and MACs, and their ability to drive exogenous gene expression in cultured cells and transgenic animals via MMCT. New avenues for a variety of applications to bio-medical challenges are also proposed.
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Affiliation(s)
- Mitsuo Oshimura
- Chromosome Engineering Research Center, Tottori University, 86 Nishi-cho, Yonago, Tottori, 683-8503, Japan,
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14
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Ohzeki JI, Larionov V, Earnshaw WC, Masumoto H. Genetic and epigenetic regulation of centromeres: a look at HAC formation. Chromosome Res 2015; 23:87-103. [PMID: 25682171 DOI: 10.1007/s10577-015-9470-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The centromere is a specialized chromosomal locus required for accurate chromosome segregation. A specific histone H3 variant, CENP-A, assembles at centromeres. CENP-A is required for kinetochore protein assembly and is an epigenetic marker for the maintenance of a functional centromere. Human CENP-A chromatin normally assembles on α-satellite DNA (alphoid DNA), a centromeric repetitive sequence. Using alphoid DNA arrays, human artificial chromosomes (HACs) have been constructed in human HT1080 cells and used to dissect the requirements for CENP-A assembly on DNA sequence. However, centromere formation is not a simple genetic event. In other commonly used human cell lines, such as HeLa and U2OS cells, no functional de novo centromere formation occurs efficiently with the same centromeric alphoid DNA sequences. Recent studies using protein tethering combined with the HAC system and/or genetic manipulation have revealed that epigenetic chromatin regulation mechanisms are also involved in the CENP-A chromatin assembly pathway and subsequent centromere/kinetochore formation. We summarize the DNA sequence requirements for CENP-A assembly and discuss the epigenetic regulation of human centromeres.
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Affiliation(s)
- Jun-ichirou Ohzeki
- Laboratory of Cell Engineering, Department of Frontier Research, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, Chiba, 292-0818, Japan
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15
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Katona RL. De novo formed satellite DNA-based mammalian artificial chromosomes and their possible applications. Chromosome Res 2015; 23:143-57. [DOI: 10.1007/s10577-014-9458-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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16
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The Robertsonian phenomenon in the house mouse: mutation, meiosis and speciation. Chromosoma 2014; 123:529-44. [PMID: 25053180 DOI: 10.1007/s00412-014-0477-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 07/08/2014] [Accepted: 07/09/2014] [Indexed: 01/01/2023]
Abstract
Many different chromosomal races with reduced chromosome number due to the presence of Robertsonian fusion metacentrics have been described in western Europe and northern Africa, within the distribution area of the western house mouse Mus musculus domesticus. This subspecies of house mouse has become the ideal model for studies to elucidate the processes of chromosome mutation and fixation that lead to the formation of chromosomal races and for studies on the impact of chromosome heterozygosities on reproductive isolation and speciation. In this review, we briefly describe the history of the discovery of the first and subsequent metacentric races in house mice; then, we focus on the molecular composition of the centromeric regions involved in chromosome fusion to examine the molecular characteristics that may explain the great variability of the karyotype that house mice show. The influence that metacentrics exert on the nuclear architecture of the male meiocytes and the consequences on meiotic progression are described to illustrate the impact that chromosomal heterozygosities exert on fertility of house mice-of relevance to reproductive isolation and speciation. The evolutionary significance of the Robertsonian phenomenon in the house mouse is discussed in the final section of this review.
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17
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Kouprina N, Tomilin AN, Masumoto H, Earnshaw WC, Larionov V. Human artificial chromosome-based gene delivery vectors for biomedicine and biotechnology. Expert Opin Drug Deliv 2014; 11:517-35. [DOI: 10.1517/17425247.2014.882314] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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18
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Tóth A, Fodor K, Praznovszky T, Tubak V, Udvardy A, Hadlaczky G, Katona RL. Novel method to load multiple genes onto a mammalian artificial chromosome. PLoS One 2014; 9:e85565. [PMID: 24454889 PMCID: PMC3893256 DOI: 10.1371/journal.pone.0085565] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 12/03/2013] [Indexed: 01/05/2023] Open
Abstract
Mammalian artificial chromosomes are natural chromosome-based vectors that may carry a vast amount of genetic material in terms of both size and number. They are reasonably stable and segregate well in both mitosis and meiosis. A platform artificial chromosome expression system (ACEs) was earlier described with multiple loading sites for a modified lambda-integrase enzyme. It has been shown that this ACEs is suitable for high-level industrial protein production and the treatment of a mouse model for a devastating human disorder, Krabbe's disease. ACEs-treated mutant mice carrying a therapeutic gene lived more than four times longer than untreated counterparts. This novel gene therapy method is called combined mammalian artificial chromosome-stem cell therapy. At present, this method suffers from the limitation that a new selection marker gene should be present for each therapeutic gene loaded onto the ACEs. Complex diseases require the cooperative action of several genes for treatment, but only a limited number of selection marker genes are available and there is also a risk of serious side-effects caused by the unwanted expression of these marker genes in mammalian cells, organs and organisms. We describe here a novel method to load multiple genes onto the ACEs by using only two selectable marker genes. These markers may be removed from the ACEs before therapeutic application. This novel technology could revolutionize gene therapeutic applications targeting the treatment of complex disorders and cancers. It could also speed up cell therapy by allowing researchers to engineer a chromosome with a predetermined set of genetic factors to differentiate adult stem cells, embryonic stem cells and induced pluripotent stem (iPS) cells into cell types of therapeutic value. It is also a suitable tool for the investigation of complex biochemical pathways in basic science by producing an ACEs with several genes from a signal transduction pathway of interest.
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Affiliation(s)
- Anna Tóth
- Institute of Genetics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Katalin Fodor
- Institute of Genetics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Tünde Praznovszky
- Institute of Genetics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Vilmos Tubak
- Institute of Genetics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Andor Udvardy
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Gyula Hadlaczky
- Institute of Genetics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Robert L. Katona
- Institute of Genetics, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
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19
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Kouprina N, Earnshaw WC, Masumoto H, Larionov V. A new generation of human artificial chromosomes for functional genomics and gene therapy. Cell Mol Life Sci 2013; 70:1135-48. [PMID: 22907415 PMCID: PMC3522797 DOI: 10.1007/s00018-012-1113-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 07/25/2012] [Accepted: 07/30/2012] [Indexed: 12/30/2022]
Abstract
Since their description in the late 1990s, human artificial chromosomes (HACs) carrying a functional kinetochore were considered as a promising system for gene delivery and expression with a potential to overcome many problems caused by the use of viral-based gene transfer systems. Indeed, HACs avoid the limited cloning capacity, lack of copy number control and insertional mutagenesis due to integration into host chromosomes that plague viral vectors. Nevertheless, until recently, HACs have not been widely recognized because of uncertainties of their structure and the absence of a unique gene acceptor site. The situation changed a few years ago after engineering of HACs with a single loxP gene adopter site and a defined structure. In this review, we summarize recent progress made in HAC technology and concentrate on details of two of the most advanced HACs, 21HAC generated by truncation of human chromosome 21 and alphoid(tetO)-HAC generated de novo using a synthetic tetO-alphoid DNA array. Multiple potential applications of the HAC vectors are discussed, specifically the unique features of two of the most advanced HAC cloning systems.
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MESH Headings
- Animals
- Animals, Genetically Modified
- Chromosomes, Artificial, Human/classification
- Chromosomes, Artificial, Human/genetics
- Chromosomes, Artificial, Human/physiology
- Disease Models, Animal
- Gene Transfer Techniques
- Genetic Diseases, Inborn/genetics
- Genetic Diseases, Inborn/pathology
- Genetic Diseases, Inborn/therapy
- Genetic Therapy/methods
- Genomics/methods
- Humans
- Models, Biological
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Affiliation(s)
- Natalay Kouprina
- Laboratory of Molecular Pharmacology, NCI, NIH, Bethesda, MD, USA.
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20
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Kouprina N, Samoshkin A, Erliandri I, Nakano M, Lee HS, Fu H, Iida Y, Aladjem M, Oshimura M, Masumoto H, Earnshaw WC, Larionov V. Organization of synthetic alphoid DNA array in human artificial chromosome (HAC) with a conditional centromere. ACS Synth Biol 2012; 1:590-601. [PMID: 23411994 DOI: 10.1021/sb3000436] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Human artificial chromosomes (HACs) represent a novel promising episomal system for functional genomics, gene therapy, and synthetic biology. HACs are engineered from natural and synthetic alphoid DNA arrays upon transfection into human cells. The use of HACs for gene expression studies requires the knowledge of their structural organization. However, none of the de novo HACs constructed so far has been physically mapped in detail. Recently we constructed a synthetic alphoid(tetO)-HAC that was successfully used for expression of full-length genes to correct genetic deficiencies in human cells. The HAC can be easily eliminated from cell populations by inactivation of its conditional kinetochore. This unique feature provides a control for phenotypic changes attributed to expression of HAC-encoded genes. This work describes organization of a megabase-size synthetic alphoid DNA array in the alphoid(tetO)-HAC that has been formed from a ~50 kb synthetic alphoid(tetO)-construct. Our analysis showed that this array represents a 1.1 Mb continuous sequence assembled from multiple copies of input DNA, a significant part of which was rearranged before assembling. The tandem and inverted alphoid DNA repeats in the HAC range in size from 25 to 150 kb. In addition, we demonstrated that the structure and functional domains of the HAC remains unchanged after several rounds of its transfer into different host cells. The knowledge of the alphoid(tetO)-HAC structure provides a tool to control HAC integrity during different manipulations. Our results also shed light on a mechanism for de novo HAC formation in human cells.
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Affiliation(s)
- Natalay Kouprina
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
| | - Alexander Samoshkin
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
| | - Indri Erliandri
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
| | - Megumi Nakano
- Laboratory
of Cell Engineering,
Department of Human Genome Research, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, Chiba 292-0818,
Japan
| | - Hee-Sheung Lee
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
| | - Haiging Fu
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
| | - Yuichi Iida
- Department of Biomedical
Science,
Institute of Regenerative Medicine and Biofunction, Graduate School
of Medical Sciences, Tottori University, Nishi-cho, Yonago, Tottori, Japan
| | - Mirit Aladjem
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
| | - Mitsuo Oshimura
- Department of Biomedical
Science,
Institute of Regenerative Medicine and Biofunction, Graduate School
of Medical Sciences, Tottori University, Nishi-cho, Yonago, Tottori, Japan
| | - Hiroshi Masumoto
- Laboratory
of Cell Engineering,
Department of Human Genome Research, Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, Chiba 292-0818,
Japan
| | - William C. Earnshaw
- Wellcome Trust Centre for Cell
Biology, University of Edinburgh, Edinburgh
EH9 3JR, Scotland
| | - Vladimir Larionov
- Laboratories of Molecular Pharmacology, National Cancer Institute, Bethesda, Maryland 20892,
United States
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21
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Xu C, Cheng Z, Yu W. Construction of rice mini-chromosomes by telomere-mediated chromosomal truncation. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2012; 70:1070-1079. [PMID: 22268496 DOI: 10.1111/j.1365-313x.2012.04916.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Telomere truncation has been shown to be an efficient technology for the creation of mini-chromosomes that can be used as artificial chromosome platforms for genetic engineering. Artificial chromosome-based genetic engineering is considered to be superior to the existing techniques of randomized gene integration by Agrobacterium or biolistic-mediated genetic transformation. It organizes multiple transgenes as a unique genetic linkage block for subsequent manipulations in breeding. Telomere truncation technology relies on three components: the telomere sequence that mediates chromosomal truncation, a selection marker that allows the selection of transgenic events, and a site-specific recombination system that can be used to accept future genes into the mini-chromosome by gene targeting. These elements are usually pre-assembled before transformation, a process that is both time and labor consuming. We found in this research that the three elements could be mixed to transform plant cells in a biolistic transformation, and produced efficient chromosomal truncations and mini-chromosomes in rice. This system will allow rapid construction of mini-chromosomes with a flexible selection of resistant markers, site-specific recombination systems and other desirable elements. In addition, a rice telotrisomic line was used as the starting material for chromosomal truncations. Mini-chromosomes from the truncations of both the telocentric chromosome and other chromosomes were recovered. The mini-chromosomes remained stable during 2 years of subculture. The construction of mini-chromosomes in rice, an economically important crop, will provide a platform for future artificial chromosome-based genetic engineering of rice for stacking multiple genes.
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Affiliation(s)
- Chunhui Xu
- State Key Laboratory for Agrobiotechnology, Institute of Plant Molecular Biology and Agricultural Biotechnology, School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
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22
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The evolutionary life cycle of the resilient centromere. Chromosoma 2012; 121:327-40. [PMID: 22527114 DOI: 10.1007/s00412-012-0369-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Revised: 03/20/2012] [Accepted: 03/20/2012] [Indexed: 12/13/2022]
Abstract
The centromere is a chromosomal structure that is essential for the accurate segregation of replicated eukaryotic chromosomes to daughter cells. In most centromeres, the underlying DNA is principally made up of repetitive DNA elements, such as tandemly repeated satellite DNA and retrotransposable elements. Paradoxically, for such an essential genomic region, the DNA is rapidly evolving both within and between species. In this review, we show that the centromere locus is a resilient structure that can undergo evolutionary cycles of birth, growth, maturity, death and resurrection. The birth phase is highlighted by examples in humans and other organisms where centromere DNA deletions or chromosome rearrangements can trigger the epigenetic assembly of neocentromeres onto genomic sites without typical features of centromere DNA. In addition, functional centromeres can be generated in the laboratory using various methodologies. Recent mapping of the foundation centromere mark, the histone H3 variant CENP-A, onto near-complete genomes has uncovered examples of new centromeres which have not accumulated centromere repeat DNA. During the growth period of the centromere, repeat DNA begins to appear at some, but not all, loci. The maturity stage is characterised by centromere repeat accumulation, expansions and contractions and the rapid evolution of the centromere DNA between chromosomes of the same species and between species. This stage provides inherent centromere stability, facilitated by repression of gene activity and meiotic recombination at and around the centromeres. Death to a centromere can result from genomic instability precipitating rearrangements, deletions, accumulation of mutations and the loss of essential centromere binding proteins. Surprisingly, ancestral centromeres can undergo resurrection either in the field or in the laboratory, via as yet poorly understood mechanisms. The underlying principle for the preservation of a centromeric evolutionary life cycle is to provide resilience and perpetuity for the all-important structure and function of the centromere.
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23
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Zhang H, Phan BH, Wang K, Artelt BJ, Jiang J, Parrott WA, Dawe RK. Stable integration of an engineered megabase repeat array into the maize genome. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2012; 70:357-365. [PMID: 22233334 DOI: 10.1111/j.1365-313x.2011.04867.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Plant genome engineering as a practical matter will require stable introduction of long and complex segments of DNA sequence into plant genomes. Here we show that it is possible to synthetically engineer and introduce centromere-sized satellite repeat arrays into maize. We designed a synthetic repeat monomer of 156 bp that contains five DNA-binding motifs (LacO, TetO, Gal4, LexA, and CENPB), and extended it into tandem arrays using an overlapping PCR method similar to that commonly used in gene synthesis. The PCR products were then directly transformed into maize using biolistic transformation. We identified three resulting insertion sites (arrayed binding sites), the longest of which is at least 1100 kb. The LacI DNA-binding module is sufficient to efficiently tether YFP to the arrayed binding sites. We conclude that synthetic repeats can be delivered into plant cells by omitting passage through Escherichia coli, that they generally insert into one locus, and that great lengths may be achieved. It is anticipated that these experimental approaches will be useful for future applications in artificial chromosome design.
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Affiliation(s)
- Han Zhang
- Department of Genetics, University of Georgia, Athens, GA 30602, USA
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24
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Marshall OJ, Choo KHA. Putative CENP-B paralogues are not present at mammalian centromeres. Chromosoma 2011; 121:169-79. [PMID: 22080934 DOI: 10.1007/s00412-011-0348-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 10/13/2011] [Accepted: 10/13/2011] [Indexed: 01/04/2023]
Abstract
Although centromere protein B (CENP-B) is a highly conserved mammalian centromere protein, its function remains unknown. The presence of the protein is required to form artificial satellite DNA-based centromeres de novo, yet cenpb knockout mice are viable for multiple generations with no mitotic or meiotic defects, and the protein is not present at fully functional neocentromeres. Previous studies have suggested that the presence of functionally redundant paralogues of CENP-B may explain the lack of a phenotype in knockout mice, and the related Tigger-derived (TIGD) family of proteins has been implicated as the most likely candidate for such paralogues. Here, we describe an investigation of the centromere-binding properties of the three TIGD proteins most highly related to CENP-B through phylogenetic analysis through EGFP fusion studies and immunocytochemistry. Although two of the three proteins bound to human centromeres with low affinity when overexpressed as fusion proteins, the strongest candidate, TIGD3, demonstrated no native centromeric binding when using raised antibodies, either in human cells or in cenpb (-/-) mouse ES cells. We conclude that the existence of functional CENP-B paralogues is highly unlikely and that CENP-B acts alone at the centromere. Based on these data, we suggest a new, meiotic drive model of CENP-B action during centromere repositioning in evolution.
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Affiliation(s)
- Owen J Marshall
- Chromosome and Chromatin Research, Murdoch Childrens Research Institute, Royal Children's Hospital, Parkville, Australia.
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25
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Noskov VN, Lee NC, Larionov V, Kouprina N. Rapid generation of long tandem DNA repeat arrays by homologous recombination in yeast to study their function in mammalian genomes. Biol Proced Online 2011; 13:8. [PMID: 21982381 PMCID: PMC3200152 DOI: 10.1186/1480-9222-13-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Accepted: 10/07/2011] [Indexed: 12/18/2022] Open
Abstract
We describe here a method to rapidly convert any desirable DNA fragment, as small as 100 bp, into long tandem DNA arrays up to 140 kb in size that are inserted into a microbe vector. This method includes rolling-circle phi29 amplification (RCA) of the sequence in vitro and assembly of the RCA products in vivo by homologous recombination in the yeast Saccharomyces cerevisiae. The method was successfully used for a functional analysis of centromeric and pericentromeric repeats and construction of new vehicles for gene delivery to mammalian cells. The method may have general application in elucidating the role of tandem repeats in chromosome organization and dynamics. Each cycle of the protocol takes ~ two weeks to complete.
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Affiliation(s)
- Vladimir N Noskov
- Laboratory of Molecular Pharmacology, National Cancer Institute, National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892, USA.
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26
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Kazuki Y, Oshimura M. Human artificial chromosomes for gene delivery and the development of animal models. Mol Ther 2011; 19:1591-601. [PMID: 21750534 DOI: 10.1038/mt.2011.136] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Random integration of conventional gene delivery vectors such as viruses, plasmids, P1 phage-derived artificial chromosomes, bacterial artificial chromosomes and yeast artificial chromosomes can be associated with transgene silencing. Furthermore, integrated viral sequences can activate oncogenes adjacent to the insertion site resulting in cancer. Various human artificial chromosomes (HACs) exhibit several potential characteristics desired for an ideal gene delivery vector, including stable episomal maintenance and the capacity to carry large genomic loci with their regulatory elements, thus allowing the physiological regulation of the introduced gene in a manner similar to that of native chromosomes. HACs have been generated mainly using either a "top-down approach" (engineered chromosomes), or a "bottom-up approach" (de novo artificial chromosomes). The recent emergence of stem cell-based tissue engineering has opened up new avenues for gene and cell therapies. This review describes the lessons learned and prospects identified mainly from studies in the construction of HACs and HAC-mediated gene expression systems in cultured cells, as well as in animals.
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Affiliation(s)
- Yasuhiro Kazuki
- Department of Biomedical Science, Institute of Regenerative Medicine and Biofunction, Graduate School of Medical Science, Tottori University, Yonago, Japan
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27
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Lin L, Koo DH, Zhang W, St Peter J, Jiang J. De novo assembly of potential linear artificial chromosome constructs capped with expansive telomeric repeats. PLANT METHODS 2011; 7:10. [PMID: 21496260 PMCID: PMC3101654 DOI: 10.1186/1746-4811-7-10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Accepted: 04/15/2011] [Indexed: 05/29/2023]
Abstract
BACKGROUND Artificial chromosomes (ACs) are a promising next-generation vector for genetic engineering. The most common methods for developing AC constructs are to clone and combine centromeric DNA and telomeric DNA fragments into a single large DNA construct. The AC constructs developed from such methods will contain very short telomeric DNA fragments because telomeric repeats can not be stably maintained in Escherichia coli. RESULTS We report a novel approach to assemble AC constructs that are capped with long telomeric DNA. We designed a plasmid vector that can be combined with a bacterial artificial chromosome (BAC) clone containing centromeric DNA sequences from a target plant species. The recombined clone can be used as the centromeric DNA backbone of the AC constructs. We also developed two plasmid vectors containing short arrays of plant telomeric DNA. These vectors can be used to generate expanded arrays of telomeric DNA up to several kilobases. The centromeric DNA backbone can be ligated with the telomeric DNA fragments to generate AC constructs consisting of a large centromeric DNA fragment capped with expansive telomeric DNA at both ends. CONCLUSIONS We successfully developed a procedure that circumvents the problem of cloning and maintaining long arrays of telomeric DNA sequences that are not stable in E. coli. Our procedure allows development of AC constructs in different eukaryotic species that are capped with long and designed sizes of telomeric DNA fragments.
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Affiliation(s)
- Li Lin
- Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Dal-Hoe Koo
- Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Wenli Zhang
- Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Joseph St Peter
- Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Jiming Jiang
- Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA
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28
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Ugarković DI. Centromere-competent DNA: structure and evolution. PROGRESS IN MOLECULAR AND SUBCELLULAR BIOLOGY 2009; 48:53-76. [PMID: 19521812 DOI: 10.1007/978-3-642-00182-6_3] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Although extant data favour centromere being an epigenetic structure, it is also clear that centromere formation is based on DNA, in particular, tandemly repeated satellite DNA and its transcripts. Presence of conserved structural motifs within satellite DNAs such as periodically distributed AT tracts, protein binding sites, or promoter elements indicate that despite sequence flexibility, there are structural determinants that are prerequisite for centromere function. In addition, existence of functional centromeric DNA transcripts indicates possible importance of structural elements at the level of RNA secondary or tertiary structure. Rapid centromere evolution is explained by homologous recombination followed by extrachromosomal rolling circle replication. This could lead to amplification of different satellite sequences within a genome. However, only those satellites that have inherent centromere-competence in the form of structural requirements necessary for centromere function are after amplification fixed in a population as a new centromere.
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Affiliation(s)
- Durd Ica Ugarković
- Department of Molecular Biology, Rud er Bosković Institute, Bijenicka 54, HR-10002, Zagreb, Croatia.
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29
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Artificial chromosome formation in maize (Zea mays L.). Chromosoma 2008; 118:157-77. [DOI: 10.1007/s00412-008-0191-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Revised: 10/22/2008] [Accepted: 10/23/2008] [Indexed: 12/11/2022]
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30
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Fu J, Wenzel SC, Perlova O, Wang J, Gross F, Tang Z, Yin Y, Stewart AF, Müller R, Zhang Y. Efficient transfer of two large secondary metabolite pathway gene clusters into heterologous hosts by transposition. Nucleic Acids Res 2008; 36:e113. [PMID: 18701643 PMCID: PMC2553598 DOI: 10.1093/nar/gkn499] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Horizontal gene transfer by transposition has been widely used for transgenesis in prokaryotes. However, conjugation has been preferred for transfer of large transgenes, despite greater restrictions of host range. We examine the possibility that transposons can be used to deliver large transgenes to heterologous hosts. This possibility is particularly relevant to the expression of large secondary metabolite gene clusters in various heterologous hosts. Recently, we showed that the engineering of large gene clusters like type I polyketide/nonribosomal peptide pathways for heterologous expression is no longer a bottleneck. Here, we apply recombineering to engineer either the epothilone (epo) or myxochromide S (mchS) gene cluster for transpositional delivery and expression in heterologous hosts. The 58-kb epo gene cluster was fully reconstituted from two clones by stitching. Then, the epo promoter was exchanged for a promoter active in the heterologous host, followed by engineering into the MycoMar transposon. A similar process was applied to the mchS gene cluster. The engineered gene clusters were transferred and expressed in the heterologous hosts Myxococcus xanthus and Pseudomonas putida. We achieved the largest transposition yet reported for any system and suggest that delivery by transposon will become the method of choice for delivery of large transgenes, particularly not only for metabolic engineering but also for general transgenesis in prokaryotes and eukaryotes.
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Affiliation(s)
- Jun Fu
- Gene Bridges GmbH, BioInnovationsZentrum Dresden, Department of Genomics, Dresden, Germany
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31
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Marshall OJ, Chueh AC, Wong LH, Choo KA. Neocentromeres: new insights into centromere structure, disease development, and karyotype evolution. Am J Hum Genet 2008; 82:261-82. [PMID: 18252209 PMCID: PMC2427194 DOI: 10.1016/j.ajhg.2007.11.009] [Citation(s) in RCA: 287] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2007] [Revised: 10/26/2007] [Accepted: 11/05/2007] [Indexed: 11/30/2022] Open
Abstract
Since the discovery of the first human neocentromere in 1993, these spontaneous, ectopic centromeres have been shown to be an astonishing example of epigenetic change within the genome. Recent research has focused on the role of neocentromeres in evolution and speciation, as well as in disease development and the understanding of the organization and epigenetic maintenance of the centromere. Here, we review recent progress in these areas of research and the significant insights gained.
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Affiliation(s)
- Owen J. Marshall
- Chromosome and Chromatin Research, Murdoch Children's Research Institute, Parkville, VIC 3052, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC 3052, Australia
| | - Anderly C. Chueh
- Chromosome and Chromatin Research, Murdoch Children's Research Institute, Parkville, VIC 3052, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC 3052, Australia
| | - Lee H. Wong
- Chromosome and Chromatin Research, Murdoch Children's Research Institute, Parkville, VIC 3052, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC 3052, Australia
| | - K.H. Andy Choo
- Chromosome and Chromatin Research, Murdoch Children's Research Institute, Parkville, VIC 3052, Australia
- Department of Paediatrics, University of Melbourne, Parkville, VIC 3052, Australia
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Plohl M, Luchetti A, Mestrović N, Mantovani B. Satellite DNAs between selfishness and functionality: structure, genomics and evolution of tandem repeats in centromeric (hetero)chromatin. Gene 2007; 409:72-82. [PMID: 18182173 DOI: 10.1016/j.gene.2007.11.013] [Citation(s) in RCA: 234] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2007] [Revised: 11/08/2007] [Accepted: 11/20/2007] [Indexed: 12/21/2022]
Abstract
Satellite DNAs (tandemly repeated, non-coding DNA sequences) stretch over almost all native centromeres and surrounding pericentromeric heterochromatin. Once considered as inert by-products of genome dynamics in heterochromatic regions, recent studies showed that satellite DNA evolution is interplay of stochastic events and selective pressure. This points to a functional significance of satellite sequences, which in (peri)centromeres may play some fundamental functional roles. First, specific interactions with DNA-binding proteins are proposed to complement sequence-independent epigenetic processes. The second role is achieved through RNAi mechanism, in which transcripts of satellite sequences initialize heterochromatin formation. In addition, satellite DNAs in (peri)centromeric regions affect chromosomal dynamics and genome plasticity. Paradoxically, while centromeric function is conserved through eukaryotes, the profile of satellite DNAs in this region is almost always species-specific. We argue that tandem repeats may be advantageous forms of DNA sequences in (peri)centromeres due to concerted evolution, which maintains high intra-array and intrapopulation sequence homogeneity of satellite arrays, while allowing rapid changes in nucleotide sequence and/or composition of satellite repeats. This feature may be crucial for long-term stability of DNA-protein interactions in centromeric regions.
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Affiliation(s)
- Miroslav Plohl
- Department of Molecular Genetics, Ruder Bosković Institute, Bijenicka 54, HR-10002 Zagreb, Croatia.
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Paar V, Basar I, Rosandić M, Glunčić M. Consensus higher order repeats and frequency of string distributions in human genome. Curr Genomics 2007; 8:93-111. [PMID: 18660848 PMCID: PMC2435359 DOI: 10.2174/138920207780368169] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2007] [Revised: 01/26/2007] [Accepted: 01/30/2007] [Indexed: 02/01/2023] Open
Abstract
Key string algorithm (KSA) could be viewed as robust computational generalization of restriction enzyme method. KSA enables robust and effective identification and structural analyzes of any given genomic sequences, like in the case of NCBI assembly for human genome. We have developed a method, using total frequency distribution of all r-bp key strings in dependence on the fragment length l, to determine the exact size of all repeats within the given genomic sequence, both of monomeric and HOR type. Subsequently, for particular fragment lengths equal to each of these repeat sizes we compute the partial frequency distribution of r-bp key strings; the key string with highest frequency is a dominant key string, optimal for segmentation of a given genomic sequence into repeat units. We illustrate how a wide class of 3-bp key strings leads to a key-string-dependent periodic cell which enables a simple identification and consensus length determinations of HORs, or any other highly convergent repeat of monomeric or HOR type, both tandem or dispersed. We illustrated KSA application for HORs in human genome and determined consensus HORs in the Build 35.1 assembly. In the next step we compute suprachromosomal family classification and CENP-B box / pJalpha distributions for HORs. In the case of less convergent repeats, like for example monomeric alpha satellite (20-40% divergence), we searched for optimal compact key string using frequency method and developed a concept of composite key string (GAAAC--CTTTG) or flexible relaxation (28 bp key string) which provides both monomeric alpha satellites as well as alpha monomer segmentation of internal HOR structure. This method is convenient also for study of R-strand (direct) / S-strand (reverse complement) alpha monomer alternations. Using KSA we identified 16 alternating regions of R-strand and S-strand monomers in one contig in choromosome 7. Use of CENP-B box and/or pJalpha motif as key string is suitable both for identification of HORs and monomeric pattern as well as for studies of CENP-B box / pJalpha distribution. As an example of application of KSA to sequences outside of HOR regions we present our finding of a tandem with highly convergent 3434-bp Long monomer in chromosome 5 (divergence less then 0.3%).
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Affiliation(s)
- Vladimir Paar
- Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
| | - Ivan Basar
- Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
| | - Marija Rosandić
- Department of Internal Medicine,
University Hospital Rebro, Kišpatićeva 12, 10000 Zagreb, Croatia
| | - Matko Glunčić
- Faculty of Science, University of Zagreb, Bijenička 32, 10000 Zagreb, Croatia
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Ren X, Tahimic CGT, Katoh M, Kurimasa A, Inoue T, Oshimura M. Human artificial chromosome vectors meet stem cells: new prospects for gene delivery. ACTA ACUST UNITED AC 2007; 2:43-50. [PMID: 17142886 DOI: 10.1007/s12015-006-0008-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/1999] [Revised: 11/30/1999] [Accepted: 11/30/1999] [Indexed: 12/14/2022]
Abstract
The recent emergence of stem cell-based tissue engineering has now opened up new venues for gene therapy. The task now is to develop safe and effective vectors that can deliver therapeutic genes into specific stem cell lines and maintain long-term regulated expression of these genes. Human artificial chromosomes (HACs) possess several characteristics that require gene therapy vectors, including a stable episomal maintenance, and the capacity for large gene inserts. HACs can also carry genomic loci with regulatory elements, thus allowing for the expression of transgenes in a genetic environment similar to the chromosome. Currently, HACs are constructed by a two prone approaches. Using a top-down strategy, HACs can be generated from fragmenting endogenous chromosomes. By a bottom-up strategy, HACs can be created de novo from cloned chromosomal components using chromosome engineering. This review describes the current advances in developing HACs, with the main focus on their applications and potential value in gene delivery, such as HAC-mediated gene expression in embryonic, adult stem cells, and transgenic animals.
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Affiliation(s)
- Xianying Ren
- Department of Biomedical Science, Institute of Regenerative Medicine and Biofunction,Tottori University, 86 Nishicho,Yonago, Tottori 683-8503, Japan
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Okamoto Y, Nakano M, Ohzeki JI, Larionov V, Masumoto H. A minimal CENP-A core is required for nucleation and maintenance of a functional human centromere. EMBO J 2007; 26:1279-91. [PMID: 17318187 PMCID: PMC1817632 DOI: 10.1038/sj.emboj.7601584] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2006] [Accepted: 01/09/2007] [Indexed: 12/14/2022] Open
Abstract
Chromatin clusters containing CENP-A, a histone H3 variant, are found in centromeres of multicellular eukaryotes. This study examines the ability of alpha-satellite (alphoid) DNA arrays in different lengths to nucleate CENP-A chromatin and form functional kinetochores de novo. Kinetochore assembly was followed by measuring human artificial chromosome formation in cultured human cells and by chromatin immunoprecipitation analysis. The results showed that both the length of alphoid DNA arrays and the density of CENP-B boxes had a strong impact on nucleation, spreading and/or maintenance of CENP-A chromatin, and formation of functional kinetochores. These effects are attributed to a change in the dynamic balance between assembly of chromatin containing trimethyl histone H3-K9 and chromatin containing CENP-A/C. The data presented here suggest that a functional minimum core stably maintained on 30-70 kb alphoid DNA arrays represents an epigenetic memory of centromeric chromatin.
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Affiliation(s)
- Yasuhide Okamoto
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya, Japan
| | - Megumi Nakano
- Laboratory of Biosystems and Cancer, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Jun-ichirou Ohzeki
- Laboratory of Biosystems and Cancer, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Vladimir Larionov
- Laboratory of Biosystems and Cancer, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Hiroshi Masumoto
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya, Japan
- Laboratory of Biosystems and Cancer, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan. Tel.: +81 52 789 2985; Fax: +81 52 789 5732; E-mail:
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Basu J, Willard HF, Stromberg G. Human Artificial Chromosome Assembly by Transposon‐Based Retrofitting of Genomic BACs with Synthetic Alpha‐Satellite Arrays. ACTA ACUST UNITED AC 2007; Chapter 5:Unit 5.18. [DOI: 10.1002/0471142905.hg0518s52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Joydeep Basu
- Duke Institute for Genome Sciences and Policy Durham North Carolina
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Rosandić M, Paar V, Basar I, Gluncić M, Pavin N, Pilas I. CENP-B box and pJalpha sequence distribution in human alpha satellite higher-order repeats (HOR). Chromosome Res 2006; 14:735-53. [PMID: 17115329 DOI: 10.1007/s10577-006-1078-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2005] [Accepted: 06/03/2006] [Indexed: 01/13/2023]
Abstract
Using our Key String Algorithm (KSA) to analyze Build 35.1 assembly we determined consensus alpha satellite higher-order repeats (HOR) and consensus distributions of CENP-B box and pJalpha motif in human chromosomes 1, 4, 5, 7, 8, 10, 11, 17, 19, and X. We determined new suprachromosomal family (SF) assignments: SF5 for 13mer (2211 bp), SF5 for 13mer (2214 bp), SF2 for 11mer (1869 bp), SF1 for 18mer (3058 bp), SF3 for 12mer (2047 bp), SF3 for 14mer (2379 bp), and SF5 for 17mer (2896 bp) in chromosomes 4, 5, 8, 10, 11, 17, and 19, respectively. In chromosome 5 we identified SF5 13mer without any CENP-B box and pJalpha motif, highly homologous (96%) to 13mer in chromosome 19. Additionally, in chromosome 19 we identified new SF5 17mer with one CENP-B box and pJalpha motif, aligned to 13mer by deleting four monomers. In chromosome 11 we identified SF3 12mer, homologous to 12mer in chromosome X. In chromosome 10 we identified new SF1 18mer with eight CENP-B boxes in every other monomer (except one). In chromosome 4 we identified new SF5 13mer with CENP-B box in three consecutive monomers. We found four exceptions to the rule that CENP-B box belongs to type B and pJalpha motif to type A monomers.
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Affiliation(s)
- Marija Rosandić
- Department of Internal Medicine, University Hospital Rebro, University of Zagreb, 10000, Zagreb, Croatia
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Tsuduki T, Nakano M, Yasuoka N, Yamazaki S, Okada T, Okamoto Y, Masumoto H. An artificially constructed de novo human chromosome behaves almost identically to its natural counterpart during metaphase and anaphase in living cells. Mol Cell Biol 2006; 26:7682-95. [PMID: 17015481 PMCID: PMC1636871 DOI: 10.1128/mcb.00355-06] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Human artificial chromosomes (HACs) are promising reagents for the analysis of chromosome function. While HACs are maintained stably, the segregation mechanisms of HACs have not been investigated in detail. To analyze HACs in living cells, we integrated 256 copies of the Lac operator into a precursor yeast artificial chromosome (YAC) containing alpha-satellite DNA and generated green fluorescent protein (GFP)-tagged HACs in HT1080 cells expressing a GFP-Lac repressor fusion protein. Time-lapse analyses of GFP-HACs and host centromeres in living mitotic cells indicated that the HAC was properly aligned at the spindle midzone and that sister chromatids of the HAC separated with the same timing as host chromosomes and moved to the spindle poles with mobility similar to that of the host centromeres. These results indicate that a HAC composed of a multimer of input alpha-satellite YACs retains most of the functions of the centromeres on natural chromosomes. The only difference between the HAC and the host chromosome was that the HAC oscillated more frequently, at higher velocity, across the spindle midzone during metaphase. However, this provides important evidence that an individual HAC has the capacity to maintain tensional balance in the pole-to-pole direction, thereby stabilizing its position around the spindle midzone.
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Affiliation(s)
- Tomohiro Tsuduki
- Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
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Basu J, Willard HF. Human artificial chromosomes: potential applications and clinical considerations. Pediatr Clin North Am 2006; 53:843-53, viii. [PMID: 17027613 DOI: 10.1016/j.pcl.2006.08.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Human artificial chromosomes demonstrate promise as a novel class of nonintegrative gene therapy vectors. The authors outline current developments in human artificial chromosome technology and examine their potential for clinical application.
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Affiliation(s)
- Joydeep Basu
- Institute for Genome Sciences & Policy, Duke University, 101 Science Drive, Durham, NC 27708, USA.
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40
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Ugarkovic D. Functional elements residing within satellite DNAs. EMBO Rep 2006; 6:1035-9. [PMID: 16264428 PMCID: PMC1371040 DOI: 10.1038/sj.embor.7400558] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2005] [Accepted: 09/20/2005] [Indexed: 12/28/2022] Open
Abstract
Satellite DNAs represent a fast-evolving portion of the eukaryotic genome whose evolution is proposed to be driven by the stochastic process of molecular drive. Recent results indicate that satellite DNAs are subject to certain structural constraints, which are probably related to their interaction with proteins involved in the establishment of specific chromatin structures. The evolutionary persistence and high sequence conservation of some satellites, as well as the presence of stage- or tissue-specific, differentially expressed transcripts in several species, are consistent with the hypothesis that satellite DNA could have a regulatory role in eukaryotic organisms. Although the role of most transcripts is not known, some act as precursors of small interfering RNAs, which are now recognized as having an important role in chromatin modulation and the control of gene expression. Furthermore, some transcripts are involved in the cellular response to stress.
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Affiliation(s)
- Durdica Ugarkovic
- Department of Molecular Biology, Ruder Boskovic Institute, Bijenicka 54, PO Box 180, HR-10002 Zagreb, Croatia.
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41
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Roizès G. Human centromeric alphoid domains are periodically homogenized so that they vary substantially between homologues. Mechanism and implications for centromere functioning. Nucleic Acids Res 2006; 34:1912-24. [PMID: 16598075 PMCID: PMC1447651 DOI: 10.1093/nar/gkl137] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Sequence analysis of alphoid repeats from human chromosomes 17, 21 and 13 reveals recurrent diagnostic variant nucleotides. Their combinations define haplotypes, with higher order repeats (HORs) containing identical or closely-related haplotypes tandemly arranged into separate domains. The haplotypes found on homologues can be totally different, while HORs remain 99.8% homogeneous both intrachromosomally and between homologues. These results support the hypothesis, never before demonstrated, that unequal crossovers between sister chromatids accumulate to produce homogenization and amplification into tandem alphoid repeats. I propose that the molecular basis of this involves the diagnostic variant nucleotides, which enable pairing between HORs with identical or closely-related haplotypes. Domains are thus periodically renewed to maintain high intrachromosomal and interhomologue homogeneity. The capacity of a domain to form an active centromere is maintained as long as neither retrotransposons nor significant numbers of mutations affect it. In the presented model, a chromosome with an altered centromere can be transiently rescued by forming a neocentromere, until a restored, fully-competent domain is amplified de novo or rehomogenized through the accumulation of unequal crossovers.
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Affiliation(s)
- Gérard Roizès
- Institut de Génétique Humaine, UPR 1142, CNRS, 141 Rue de la Cardonille, 34396 Montpellier Cedex 5, France.
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42
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Abstract
Artificial chromosomes is an exciting technology which has developed rapidly since the late 1990s. HACs (human artificial chromosomes) are autonomous molecules that can function and segregate as normal chromosomes in human cells. The advantages of an artificial-chromosome-based system are 2-fold. First, HACs are an excellent research tool for investigating the requirements for normal chromosome structure and function during the cell cycle. They are important in defining the sequence requirements of functional chromosomes, and investigating the organization and composition of the chromatin. Secondly, HACs are useful gene-transfer vectors for expression studies in mammalian cells, with the capacity to incorporate large DNA segments encompassing genes and their regulatory elements. As episomes, they are stably maintained, leading to more reliable and prolonged transgene expression. HACs offer the possibility of long-term gene expression in human cells and the development of future somatic gene therapy.
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43
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May BP, Lippman ZB, Fang Y, Spector DL, Martienssen RA. Differential regulation of strand-specific transcripts from Arabidopsis centromeric satellite repeats. PLoS Genet 2005; 1:e79. [PMID: 16389298 PMCID: PMC1317654 DOI: 10.1371/journal.pgen.0010079] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Accepted: 11/16/2005] [Indexed: 01/23/2023] Open
Abstract
Centromeres interact with the spindle apparatus to enable chromosome disjunction and typically contain thousands of tandemly arranged satellite repeats interspersed with retrotransposons. While their role has been obscure, centromeric repeats are epigenetically modified and centromere specification has a strong epigenetic component. In the yeast Schizosaccharomyces pombe, long heterochromatic repeats are transcribed and contribute to centromere function via RNA interference (RNAi). In the higher plant Arabidopsis thaliana, as in mammalian cells, centromeric satellite repeats are short (180 base pairs), are found in thousands of tandem copies, and are methylated. We have found transcripts from both strands of canonical, bulk Arabidopsis repeats. At least one subfamily of 180–base pair repeats is transcribed from only one strand and regulated by RNAi and histone modification. A second subfamily of repeats is also silenced, but silencing is lost on both strands in mutants in the CpG DNA methyltransferase MET1, the histone deacetylase HDA6/SIL1, or the chromatin remodeling ATPase DDM1. This regulation is due to transcription from Athila2 retrotransposons, which integrate in both orientations relative to the repeats, and differs between strains of Arabidopsis. Silencing lost in met1 or hda6 is reestablished in backcrosses to wild-type, but silencing lost in RNAi mutants and ddm1 is not. Twenty-four–nucleotide small interfering RNAs from centromeric repeats are retained in met1 and hda6, but not in ddm1, and may have a role in this epigenetic inheritance. Histone H3 lysine-9 dimethylation is associated with both classes of repeats. We propose roles for transcribed repeats in the epigenetic inheritance and evolution of centromeres. Centromeres are regions of the chromosome that pull the chromosomes to the correct daughter cell during division. They are surrounded by tens of thousands of short satellite repeats, commonly called “junk” DNA. The authors show that these repeats are transcribed into RNA, which is subject to RNA interference, giving rise to large amounts of small interfering RNA. Transcripts are associated with chromosomes during interphase, and mutants in heterochromatin formation have elevated transcript levels. At least two classes of transcripts are silenced by two different epigenetic mechanisms, in part because of transposons inserted into them. This pattern of insertion and regulation varies between natural accessions of Arabidopsis. The authors' results suggest a model for centromere evolution and speciation driven by mismatch between pericentromeric repeats and small interfering RNAs in wide crosses.
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Affiliation(s)
| | | | - Yuda Fang
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, United States of America
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44
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Irvine DV, Shaw ML, Choo KHA, Saffery R. Engineering chromosomes for delivery of therapeutic genes. Trends Biotechnol 2005; 23:575-83. [PMID: 16242803 DOI: 10.1016/j.tibtech.2005.10.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2005] [Revised: 06/03/2005] [Accepted: 10/06/2005] [Indexed: 02/02/2023]
Abstract
The ability to create fully functional human chromosome vectors represents a potentially exciting gene-delivery system for the correction of human genetic disorders with several advantages over viral delivery systems. However, for the full potential of chromosome-based gene-delivery vectors to be realized, several key obstacles must be overcome. Methods must be developed to insert therapeutic genes reliably and efficiently and to enable the stable transfer of the resulting chromosomal vectors to different therapeutic cell types. Research to achieve these outcomes continues to encounter major challenges; however recent developments have reiterated the potential of chromosome-based vectors for therapeutic gene delivery. Here we review the different strategies under development and discuss the advantages and problems associated with each.
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Affiliation(s)
- Danielle V Irvine
- Chromosome Research Group, Murdoch Childrens Research Institute, Royal Children's Hospital, Department of Paediatrics, University of Melbourne, Flemington Road, Parkville 3052, Australia
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45
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Grimes BR, Monaco ZL. Artificial and engineered chromosomes: developments and prospects for gene therapy. Chromosoma 2005; 114:230-41. [PMID: 16133351 DOI: 10.1007/s00412-005-0017-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Revised: 07/05/2005] [Accepted: 07/05/2005] [Indexed: 01/15/2023]
Abstract
At the gene therapy session of the ICCXV Chromosome Conference (2004), recent advances in the construction of engineered chromosomes and de novo human artificial chromosomes were presented. The long-term aims of these studies are to develop vectors as tools for studying genome and chromosome function and for delivering genes into cells for therapeutic applications. There are two primary advantages of chromosome-based vector systems over most conventional vectors for gene delivery. First, the transferred DNA can be stably maintained without the risks associated with insertion, and second, large DNA segments encompassing genes and their regulatory elements can be introduced, leading to more reliable transgene expression. There is clearly a need for safe and effective gene transfer vectors to correct genetic defects. Among the topics discussed at the gene therapy session and the main focus of this review are requirements for de novo human artificial chromosome formation, assembly of chromatin on de novo human artificial chromosomes, advances in vector construction, and chromosome transfer to cells and animals.
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Affiliation(s)
- Brenda R Grimes
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, 975 W. Walnut St, IB130, Indianapolis, IN 46202, USA.
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Ebersole T, Okamoto Y, Noskov VN, Kouprina N, Kim JH, Leem SH, Barrett JC, Masumoto H, Larionov V. Rapid generation of long synthetic tandem repeats and its application for analysis in human artificial chromosome formation. Nucleic Acids Res 2005; 33:e130. [PMID: 16141190 PMCID: PMC1197135 DOI: 10.1093/nar/gni129] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Human artificial chromosomes (HACs) provide a unique opportunity to study kinetochore formation and to develop a new generation of vectors with potential in gene therapy. An investigation into the structural and the functional relationship in centromeric tandem repeats in HACs requires the ability to manipulate repeat substructure efficiently. We describe here a new method to rapidly amplify human alphoid tandem repeats of a few hundred base pairs into long DNA arrays up to 120 kb. The method includes rolling-circle amplification (RCA) of repeats in vitro and assembly of the RCA products by in vivo recombination in yeast. The synthetic arrays are competent in HAC formation when transformed into human cells. As short multimers can be easily modified before amplification, this new technique can identify repeat monomer regions critical for kinetochore seeding. The method may have more general application in elucidating the role of other tandem repeats in chromosome organization and dynamics.
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Affiliation(s)
| | - Yasuhide Okamoto
- Division of Biological Science, Graduate School of Science, Nagoya UniversityChikusa-ku, Nagoya 464-8602, Japan
| | | | | | | | | | | | | | - Vladimir Larionov
- To whom correspondence should be addressed. Tel: +1 301 496 7941; Fax: +1 301 480 2772;
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47
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Basu J, Willard HF. Artificial and engineered chromosomes: non-integrating vectors for gene therapy. Trends Mol Med 2005; 11:251-8. [PMID: 15882613 DOI: 10.1016/j.molmed.2005.03.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Non-integrating gene-delivery platforms demonstrate promise as potentially ideal gene-therapy vector systems. Although several approaches are under development, there is little consensus as to what constitutes a true 'artificial' versus an 'engineered' human chromosome. Recent progress must be evaluated in light of significant technical challenges that remain before such vectors achieve clinical utility. Here, we examine the principal classes of non-integrating vectors, ranging from episomes to engineered mini-chromosomes to true human artificial chromosomes. We compare their potential as practical gene-transfer platforms and summarize recent advances towards eventual applications in gene therapy. Although chromosome-engineering technology has advanced considerably within recent years, difficulties in establishing composition of matter and effective vector delivery currently prevent artificial or engineered chromosomes being accepted as viable gene-delivery platforms.
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Affiliation(s)
- Joydeep Basu
- Institute for Genome Sciences and Policy, Duke University, Durham, NC 27708, USA.
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48
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Affiliation(s)
- R Kelly Dawe
- Department of Plant Biology, University of Georgia, Miller Plant Sciences Building, Athens, GA 30602, USA.
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49
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Lee HR, Zhang W, Langdon T, Jin W, Yan H, Cheng Z, Jiang J. Chromatin immunoprecipitation cloning reveals rapid evolutionary patterns of centromeric DNA in Oryza species. Proc Natl Acad Sci U S A 2005; 102:11793-8. [PMID: 16040802 PMCID: PMC1187982 DOI: 10.1073/pnas.0503863102] [Citation(s) in RCA: 132] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The functional centromeres of rice (Oryza sativa, AA genome) chromosomes contain two key DNA components: the CRR centromeric retrotransposons and a 155-bp satellite repeat, CentO. However, several wild Oryza species lack the CentO repeat. We developed a chromatin immunoprecipitation-based technique to clone DNA fragments derived from chromatin containing the centromeric histone H3 variant CenH3. Chromatin immunoprecipitation cloning was carried out in the CentO-less species Oryza rhizomatis (CC genome) and Oryza brachyantha (FF genome). Three previously uncharacterized genome-specific satellite repeats, CentO-C1, CentO-C2, and CentO-F, were discovered in the centromeres of these two species. An 80-bp DNA region was found to be conserved in CentO-C1, CentO, and centromeric satellite repeats from maize and pearl millet, species which diverged from rice many millions of years ago. In contrast, the CentO-F repeat shows no sequence similarity to other centromeric repeats but has almost completely replaced other centromeric sequences in O. brachyantha, including the CRR-related sequences that normally constitute a significant fraction of the centromeric DNA in grass species.
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Affiliation(s)
- Hye-Ran Lee
- Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706, USA
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Basu J, Compitello G, Stromberg G, Willard HF, Van Bokkelen G. Efficient assembly of de novo human artificial chromosomes from large genomic loci. BMC Biotechnol 2005; 5:21. [PMID: 15998466 PMCID: PMC1182356 DOI: 10.1186/1472-6750-5-21] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2005] [Accepted: 07/05/2005] [Indexed: 01/20/2023] Open
Abstract
Background Human Artificial Chromosomes (HACs) are potentially useful vectors for gene transfer studies and for functional annotation of the genome because of their suitability for cloning, manipulating and transferring large segments of the genome. However, development of HACs for the transfer of large genomic loci into mammalian cells has been limited by difficulties in manipulating high-molecular weight DNA, as well as by the low overall frequencies of de novo HAC formation. Indeed, to date, only a small number of large (>100 kb) genomic loci have been reported to be successfully packaged into de novo HACs. Results We have developed novel methodologies to enable efficient assembly of HAC vectors containing any genomic locus of interest. We report here the creation of a novel, bimolecular system based on bacterial artificial chromosomes (BACs) for the construction of HACs incorporating any defined genomic region. We have utilized this vector system to rapidly design, construct and validate multiple de novo HACs containing large (100–200 kb) genomic loci including therapeutically significant genes for human growth hormone (HGH), polycystic kidney disease (PKD1) and ß-globin. We report significant differences in the ability of different genomic loci to support de novo HAC formation, suggesting possible effects of cis-acting genomic elements. Finally, as a proof of principle, we have observed sustained ß-globin gene expression from HACs incorporating the entire 200 kb ß-globin genomic locus for over 90 days in the absence of selection. Conclusion Taken together, these results are significant for the development of HAC vector technology, as they enable high-throughput assembly and functional validation of HACs containing any large genomic locus. We have evaluated the impact of different genomic loci on the frequency of HAC formation and identified segments of genomic DNA that appear to facilitate de novo HAC formation. These genomic loci may be useful for identifying discrete functional elements that may be incorporated into future generations of HAC vectors.
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MESH Headings
- Biotechnology/methods
- Cell Line
- Chromosomes, Artificial, Bacterial/genetics
- Chromosomes, Artificial, Human/genetics
- Cloning, Molecular
- DNA
- DNA, Satellite
- Fibroblasts/cytology
- Gene Transfer Techniques
- Genetic Techniques
- Genetic Vectors
- Genome
- Globins/genetics
- Human Growth Hormone/genetics
- Humans
- In Situ Hybridization, Fluorescence
- Microscopy, Fluorescence
- Models, Genetic
- Polycystic Kidney Diseases/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Transfection
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Affiliation(s)
- Joydeep Basu
- Institute for Genome Sciences & Policy, Duke University, Durham, NC 27708, USA
- Athersys Inc., 3201 Carnegie Avenue, Cleveland, OH 44115, USA
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