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Li F, Yang L, Han J, Han X, Peng L, Du Y, Xia H, Yang L, Zhou Y. Characterization of extrachromosomal circular DNA in cattle using 676 whole genome sequencing datasets. Anim Genet 2022; 53:761-768. [PMID: 36226728 DOI: 10.1111/age.13269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 09/22/2022] [Accepted: 09/24/2022] [Indexed: 11/28/2022]
Abstract
Extrachromosomal circular DNA (eccDNA) is an important fraction of the genome. Recent studies proved that eccDNA plays important roles in genetic variation, aging and environmental adaptation, which have drawn wide attention. However, the characteristics of eccDNA in cattle remain unclear. Here, we studied eccDNAs from 676 cattle of 58 breeds using whole genome sequencing datasets. In total, 47 355 high-confidence eccDNAs were identified and covered 4.6% of the cattle autosomes in length. Similarly to other species, the cattle eccDNA preferentially located in the genic and repeat sequences. Cattle eccDNAs contained complete sequences of 661 genes, which were significantly (p < 0.05) enriched in immunity-related functions. The eccDNA was further proved to have inverted repeats on the boundaries, which contained a high proportion of A/T and ranged from 4 to 17 bp. Interestingly, we successfully separated animals according to their geographical distributions and their tissues where DNA was isolated. This implied possible roles for eccDNA in cattle selection and tissue development. Our study supplies basic knowledges on eccDNAs in cattle, which will promote understanding of extrachromosomal DNA.
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Affiliation(s)
- Fan Li
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Lv Yang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Jiazheng Han
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Xiaotao Han
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Lingwei Peng
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Yuqin Du
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Han Xia
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Liguo Yang
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,National Center for International Research on Animal Genetics, Breeding and Reproduction, Huazhong Agricultural University, Wuhan, China.,Frontiers Science Center for Animal Breeding and Sustainable Production, Huazhong Agricultural University, Wuhan, China
| | - Yang Zhou
- Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,National Center for International Research on Animal Genetics, Breeding and Reproduction, Huazhong Agricultural University, Wuhan, China.,Frontiers Science Center for Animal Breeding and Sustainable Production, Huazhong Agricultural University, Wuhan, China
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Extrachromosomal circular DNA: biogenesis, structure, functions and diseases. Signal Transduct Target Ther 2022; 7:342. [PMID: 36184613 PMCID: PMC9527254 DOI: 10.1038/s41392-022-01176-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 08/14/2022] [Accepted: 09/01/2022] [Indexed: 11/08/2022] Open
Abstract
Extrachromosomal circular DNA (eccDNA), ranging in size from tens to millions of base pairs, is independent of conventional chromosomes. Recently, eccDNAs have been considered an unanticipated major source of somatic rearrangements, contributing to genomic remodeling through chimeric circularization and reintegration of circular DNA into the linear genome. In addition, the origin of eccDNA is considered to be associated with essential chromatin-related events, including the formation of super-enhancers and DNA repair machineries. Moreover, our understanding of the properties and functions of eccDNA has continuously and greatly expanded. Emerging investigations demonstrate that eccDNAs serve as multifunctional molecules in various organisms during diversified biological processes, such as epigenetic remodeling, telomere trimming, and the regulation of canonical signaling pathways. Importantly, its special distribution potentiates eccDNA as a measurable biomarker in many diseases, especially cancers. The loss of eccDNA homeostasis facilitates tumor initiation, malignant progression, and heterogeneous evolution in many cancers. An in-depth understanding of eccDNA provides novel insights for precision cancer treatment. In this review, we summarized the discovery history of eccDNA, discussed the biogenesis, characteristics, and functions of eccDNA. Moreover, we emphasized the role of eccDNA during tumor pathogenesis and malignant evolution. Therapeutically, we summarized potential clinical applications that target aberrant eccDNA in multiple diseases.
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Ling X, Han Y, Meng J, Zhong B, Chen J, Zhang H, Qin J, Pang J, Liu L. Small extrachromosomal circular DNA (eccDNA): major functions in evolution and cancer. Mol Cancer 2021; 20:113. [PMID: 34479546 PMCID: PMC8414719 DOI: 10.1186/s12943-021-01413-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 08/22/2021] [Indexed: 12/13/2022] Open
Abstract
Extrachromosomal circular DNA (eccDNA) refers to a type of circular DNA that originate from but are likely independent of chromosomes. Due to technological advancements, eccDNAs have recently emerged as multifunctional molecules with numerous characteristics. The unique topological structure and genetic characteristics of eccDNAs shed new light on the monitoring, early diagnosis, treatment, and prediction of cancer. EccDNAs are commonly observed in both normal and cancer cells and function via different mechanisms in the stress response to exogenous and endogenous stimuli, aging, and carcinogenesis and in drug resistance during cancer treatment. The structural diversity of eccDNAs contributes to the function and numerical diversity of eccDNAs and thereby endows eccDNAs with powerful roles in evolution and in cancer initiation and progression by driving genetic plasticity and heterogeneity from extrachromosomal sites, which has been an ignored function in evolution in recent decades. EccDNAs show great potential in cancer, and we summarize the features, biogenesis, evaluated functions, functional mechanisms, related methods, and clinical utility of eccDNAs with a focus on their role in evolution and cancer.
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Affiliation(s)
- Xiaoxuan Ling
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Yali Han
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Jinxue Meng
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Bohuan Zhong
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Jialong Chen
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China.,Department of Preventive Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - He Zhang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China.,Department of Preventive Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Jiheng Qin
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Jing Pang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China
| | - Linhua Liu
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China. .,Department of Preventive Medicine, School of Public Health, Guangdong Medical University, Dongguan, 523808, P.R. China.
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Liao Z, Jiang W, Ye L, Li T, Yu X, Liu L. Classification of extrachromosomal circular DNA with a focus on the role of extrachromosomal DNA (ecDNA) in tumor heterogeneity and progression. Biochim Biophys Acta Rev Cancer 2020; 1874:188392. [PMID: 32735964 DOI: 10.1016/j.bbcan.2020.188392] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/26/2020] [Accepted: 07/10/2020] [Indexed: 02/08/2023]
Abstract
Although the eukaryotic genome is mainly comprised of linear chromosomal DNA, genes can also be found outside of chromosomes. The unconventional presence of extrachromosomal genes is usually found to be circular, and these structures are named extrachromosomal circular DNA (eccDNA), which are often observed in cancer cells. Various types of eccDNA including small polydispersed DNA (spcDNA), telomeric cirlces, microDNA, etc. have been discovered. Among these eccDNA, extrachromosomal DNA (ecDNA), which encompasses the full spectrum of large, gene-containing extrachromosomal particles, has regained great research interest due to recent technological advances such as next-generation sequencing and super-resolution microscopy. In this review, we summarize the different types of eccDNA and discuss the role of eccDNA, especially ecDNA in tumor heterogeneity and progression. Additionally, we discuss some possible future investigative directions related to ecDNA biogenesis and its clinical application.
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Affiliation(s)
- Zhenyu Liao
- Department of Pancreatic Surgery, Shanghai Cancer Centre, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Shanghai Pancreatic Cancer Institute, Shanghai, China; Pancreatic Cancer Institute, Fudan University, Shanghai, China
| | - Wang Jiang
- Department of Pancreatic Surgery, Shanghai Cancer Centre, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Shanghai Pancreatic Cancer Institute, Shanghai, China; Pancreatic Cancer Institute, Fudan University, Shanghai, China
| | - Longyun Ye
- Department of Pancreatic Surgery, Shanghai Cancer Centre, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Shanghai Pancreatic Cancer Institute, Shanghai, China; Pancreatic Cancer Institute, Fudan University, Shanghai, China
| | - Tianjiao Li
- Department of Pancreatic Surgery, Shanghai Cancer Centre, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Shanghai Pancreatic Cancer Institute, Shanghai, China; Pancreatic Cancer Institute, Fudan University, Shanghai, China
| | - Xianjun Yu
- Department of Pancreatic Surgery, Shanghai Cancer Centre, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Shanghai Pancreatic Cancer Institute, Shanghai, China; Pancreatic Cancer Institute, Fudan University, Shanghai, China.
| | - Liang Liu
- Department of Pancreatic Surgery, Shanghai Cancer Centre, Fudan University, Shanghai, China; Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China; Shanghai Pancreatic Cancer Institute, Shanghai, China; Pancreatic Cancer Institute, Fudan University, Shanghai, China.
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Zhu J, Chen S, Zhang F, Wang L. Cell-Free eccDNAs: A New Type of Nucleic Acid Component for Liquid Biopsy? Mol Diagn Ther 2019; 22:515-522. [PMID: 29959693 DOI: 10.1007/s40291-018-0348-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Extrachromosomal circular DNAs (eccDNAs) are circular DNAs that are originated from chromosomes, but are independent from chromosomal DNA. The eccDNAs are commonly found in various tissues and cell types, and in both normal and diseased conditions. Due to their highly heterogeneous origins and being widely spread in nearly all eukaryotes, the eccDNAs are believed to reflect the genome's plasticity and instability. With the assistance of next-generation sequencing, more eccDNAs have been characterized at the molecular level. Recently, eccDNAs have been reported as cell-free DNAs in the circulation system. Importantly, these circulating eccDNAs have shown some evidence with disease associations, suggesting their potential utility as a new type of biomarker for disease detection, treatment assessment and progress surveillance. However, many challenges need to be addressed before implementing the eccDNAs as a new source of genetic material for liquid biopsy.
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Affiliation(s)
- Jing Zhu
- Laboratory of Medical Genetics, Harbin Medical University, 157 Baojian Road, Harbin, 150081, Heilongjiang, China.
| | - Siyu Chen
- Laboratory of Medical Genetics, Harbin Medical University, 157 Baojian Road, Harbin, 150081, Heilongjiang, China
| | - Fan Zhang
- School of Computer Science and Technology, Harbin Institute of Technology, Harbin, 150001, Heilongjiang, China
| | - Liang Wang
- Department of Pathology and MCW Cancer Center, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA.
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Kehrer H, Krone W. Spontaneous chromosomal aberrations in cell cultures from patients with neurofibromatosis 1. Mutat Res 1994; 306:61-70. [PMID: 7512203 DOI: 10.1016/0027-5107(94)90167-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Neurofibroma-derived cell cultures, skin fibroblast strains from NF1 patients, melanocyte cultures from café-au-lait spots and melanocytes from skin overlying neurofibroma were investigated with regard to the frequencies of spontaneous chromosomal aberrations. A 3.4-fold increased rate of stable and unstable chromosome aberrations in 34 neurofibroma cultures of 18 NF1 patients was noticed in comparison to 17 skin biopsy-derived cultures of healthy probands. Fibroblast strains from the unaffected skin of nine NF1 patients revealed a 2.6-fold higher rate of chromosome breakage compared with the control cultures. Likewise, an increase of spontaneous chromosomal instability by a factor of 13.5 was found in cultured melanocytes from café-au-lait spots and by a factor of 11.9 in the skin-melanocyte cultures of six NF1 patients in comparison to foreskin-derived melanocyte strains of five unaffected persons. Analyses of the distribution of chromatid and chromosome breaks along the chromosomes revealed a significant clustering of these events in the centromeric regions specifically in the four kinds of NF1-derived cultures.
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Affiliation(s)
- H Kehrer
- Abteilung Humangenetik, Universität Ulm, Germany
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Motejlek K, Schindler D, Assum G, Krone W. Increased amount and contour length distribution of small polydisperse circular DNA (spcDNA) in Fanconi anemia. Mutat Res 1993; 293:205-14. [PMID: 7679470 DOI: 10.1016/0921-8777(93)90071-n] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Small polydisperse circular DNA (spcDNA) in Fanconi anemia (FA) was analyzed from cultured fibroblast-like cells by electron microscopy. Application of the mica-press adsorption technique for the semi-quantitative determination of spcDNA amounts to three FA and three normal control skin-derived fibroblast strains revealed 85-fold increased levels of spcDNA in the FA cells. An even higher excess over controls was suggested when the FA fibroblasts were propagated for up to 11 serial in vitro passages, consistent with the short replicative life-span of primary FA cells and their rapid transition into a poorly dividing state, in which spcDNA reportedly further increases. In addition, contour length distributions of gradient-purified spcDNA preparations from five FA fibroblast strains were compared with those from five normal control strains. Mean spcDNA contour lengths were significantly greater in the FA than in the control cells. The reported findings of increased spcDNA amounts and sizes in FA coincide with a similar association of chromosome instability and abnormal spcDNA formation previously observed in cultured cells derived from angiofibromas in tuberous sclerosis. Circumstantial evidence from the present study in the paradigmatic chromosome breakage syndrome FA further supports the suggestion that a common mechanism underlies chromosome instability and the surplus generation of spcDNA. Notably, this apparent mechanism is functional in homonuclear primary cell strains with a distinct inherited basis of their chromosome instability, and is not restricted to heteroploid and neoplastoid cell lines.
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Affiliation(s)
- K Motejlek
- Abteilung Humangenetik, Universität Ulm, Germany
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Motejlek K, Assum G, Krone W, Kleinschmidt AK. The size of small polydisperse circular DNA (spcDNA) in angiofibroma-derived cell cultures from patients with tuberous sclerosis (TSC) differs from that in fibroblasts. Hum Genet 1991; 87:6-10. [PMID: 1645325 DOI: 10.1007/bf01213083] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Cell cultures were derived from angiofibromas of three patients with tuberous sclerosis (TSC), from the unaffected skin of these patients, and from the skin of five healthy donors. The length distributions of the small polydisperse circular DNA (spcDNA) fraction of these cell cultures were then analyzed. Nearly half the spcDNA molecules from the angiofibroma cultures were longer than 0.4 micron, whereas only about 7% exceeded this threshold in the spcDNA preparations from the skin fibroblast cultures. The percentage of the larger size class of spcDNA showed an increase at higher numbers of in vitro passages in all three types of cultures, but this effect was much more conspicuous in the angiofibroma-derived cultures than in those from the skin fibroblasts. An age-dependent increase in the overall amount of spcDNA was only seen in the angiofibroma-derived cultures. Our earlier finding of elevated amounts of spcDNA in angiofibroma cultures was confirmed in cultures from an additional TSC patient.
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Affiliation(s)
- K Motejlek
- Abteilung Humangenetik der Universität, Ulm, Federal Republic of Germany
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Dietrich CU, Krone W, Hochsattel R. Cytogenetic studies in tuberous sclerosis. CANCER GENETICS AND CYTOGENETICS 1990; 45:161-77. [PMID: 2156608 DOI: 10.1016/0165-4608(90)90080-t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A cytogenetic study was performed with cultures derived from peripheral blood, unaffected skin, and angiofibromas of four patients suffering from the sporadic form of tuberous sclerosis (TSC). Increased frequencies of unstable chromosomal anomalies were found in lymphocytes and in fibroblasts from unaffected skin of the patients. The slight increase of the overall rate of unstable anomalies observed in angiofibroma-derived cultures above that of lymphocytes and skin fibroblasts, respectively, could almost entirely be attributed to a higher frequency of dicentric chromosomes. Of the 17 facial angiofibromas from which a total of 20 cell cultures were established, nine showed a normal karyotype, while eight exhibited stable chromosomal rearrangements, among which 19 clonal types could be identified. Unbalanced forms of various translocations caused partial trisomies of the long arms of chromosomes 1, 3, 7, 10, and 15. There was no clustering of breakpoints to a particular chromosomal region, nor was one particular chromosome preferentially involved. Frequencies and kinds of rearrangements varied between cultures derived from different angiofibromas from the same patient and between different culture charges from the same tumor. Tetraploidy was not generally more abundant in the angiofibroma-derived cultures, but there were a few culture charges with exceedingly high rates of tetraploid cells. The occurrence of premature centromere disjunction (PCD), either affecting all chromosomes or only part of them in angiofibroma-derived cultures, first described in TSC by Scappaticci et al. could be confirmed.
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Affiliation(s)
- C U Dietrich
- Abteilung Humangenetik, Universitaet Ulm, Federal Republic of Germany
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Assum G, Böckle B, Fink T, Dmochewitz U, Krone W. Restriction analysis of chromosomal sequences homologous to single-copy fragments cloned from small polydisperse circular DNA (spcDNA). Hum Genet 1989; 82:249-54. [PMID: 2567274 DOI: 10.1007/bf00291164] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Restriction fragments from the fraction of small polydisperse circular DNA (spcDNA) were cloned in pBR322. The spcDNA was prepared from cell cultures derived from an angiofibroma of a patient with tuberous sclerosis (TS). Such cultures have been shown previously to contain increased amounts of spcDNA. Four cloned spcDNA fragments containing single-copy sequences were chosen to characterize the homologous chromosomal DNA segments by restriction analysis. When used as hybridization probes, these four fragments generate well-defined nonvariable patterns in the chromosomal DNA from healthy donors. The restriction patterns obtained with one of the fragments (D-C4) can best be interpreted by assuming the presence of two copies of the homologous sequences in chromosomal DNA. A second sequence, A-B4, occurs at least 30-50 times in the haploid human genome. In both cases the duplicated regions span relatively large segments of DNA.
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Affiliation(s)
- G Assum
- Abteilung Humangenetik der Universität, Ulm, Federal Republic of Germany
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