In a series of publications, the hypothesis of a special-type of endo-polyploidy, marked by 4-chromatid chromosomes (diplochromosomes), in the initiation of tumorigenesis has been presented from in vitro experiments. ...In a series of publications, the hypothesis of a special-type of endo-polyploidy, marked by 4-chromatid chromosomes (diplochromosomes), in the initiation of tumorigenesis has been presented from in vitro experiments. This review uses cellular happenings in benign pre-neoplasia to substantiate this idea, which appears to be linked to the wound-healing process of injured tissue. Rarer association between a wound healing process and a cancer occurrence has long been known. The wound healing multi-program-system involved a phase of tetraploidy that showed diplochromosomes. The hypothesis is that the inflammatory phase may not always be sufficient in getting rid of dead and damaged cells (by apoptosis and autophagy), such that cells with genomic damage (DNA breakage) may survive by genomic repair associated with change to diplochromosomal tetraploidy. In vitro data have shown division of these cells to be an orderly, mechanistic two-step, meiotic-like system, resulting in only two types of progeny cells: 4n/4C/G1 and 2n/2C/G1 pseudo-diploid cells with hyperplastic-like growth-morphology. In vivo damage to tissues can be from many sources for example, physical, toxic environment or from a disease as in Barrett’s esophagus (BE) with acid reflux into the esophagus. For this condition, it is acknowledged that damage of the esophagus lining is a pre-condition to hyperplastic lesions of pre-neoplasia. These initial lesions were from “diploid” propagating cells and, 4n cells with G2 genomic content (no mitosis) accumulated in these lesions before a change to dysplasia. Cell cycle kinetics put these 4n cells in G1, which with S-phase entry would lead to asymmetric tetraploid mitoses, characteristic for dysplastic lesions. This change in hyperplasia to dysplasia is the root-essential condition for a potential progression of pre-neoplasia to cancer. In BE the hyperplastic lesion showed increasing gains of cells with inactivated p53 and p16[ink4a] genes, which destroyed the retinoblastoma (Rb) protein-control over S-phase entry from G1. Rb-protein is a key controller of cycling advancement from G1 (also for normal cells), and is frequently inactivated in tumor cells. Thus in BE, 4n/4C/G1 cells with mutated p53 and p16[ink4a] genes gained cycling ability to tetraploid aneuploid cell cycles, which constituted the change from hyperplasia to dysplastic lesions. In general, such lesions have high predictive value for a cancerous change. Proliferation rates of pre-neoplasia and progression have been shown to be increased by a component of the wound healing program.展开更多
目的对2021年采集于我国福建的A组轮状病毒(group A rotavirus,RVA)G3P[8]毒株FJ21351116进行全基因组分子特征分析。方法使用高灵敏度A组轮状病毒全基因组测序方法对FJ21351116进行全基因组测序。用MEGA11.0、Geneious9.0.2和DNASTAR...目的对2021年采集于我国福建的A组轮状病毒(group A rotavirus,RVA)G3P[8]毒株FJ21351116进行全基因组分子特征分析。方法使用高灵敏度A组轮状病毒全基因组测序方法对FJ21351116进行全基因组测序。用MEGA11.0、Geneious9.0.2和DNASTAR软件通过核酸序列分析评估病毒的基因组特征。使用BioEdit v.7.0.9.0和PyMOL v.2.5.2分析VP7和VP4(VP8*)的中和表位。结果我国福建RVA毒株FJ21351116基因型为G3-P[8]-I2-R2-C2-M2-A2-N2-T2-E2-H2,系统进化分析显示,FJ21351116株的VP7、VP4、VP3、NSP2-NSP5基因与近几年日本检测到的马样DS-1样G3P[8]基因存在亲缘关系。而VP6、VP1、VP2、NSP1基因与大部分国家G2P[4]的相应基因亲缘关系近,特别是新加坡,表明该毒株是马样G3P[8]毒株与G2P[4]毒株共感染过程中通过基因重配形成的。FJ21351116的VP7/VP4基因与Rotarix和RotaTeq疫苗的进化分析表明,VP7和VP4(VP8*)中和抗原表位与疫苗氨基酸位点均存在多个突变。推测Rotarix和RotaTeq疫苗针对马样DS-1样G3P[8]RVA的保护效果不佳,且与Rotarix的中和抗原表位氨基酸差异高于RotaTeq。结论本研究发现一例中国罕见的DS-1样G3P[8]型RVA毒株,且疫苗株可能对其保护效果差,强调了持续监测RVA毒株及研发高效覆盖面全的RVA疫苗的重要性。展开更多
文摘In a series of publications, the hypothesis of a special-type of endo-polyploidy, marked by 4-chromatid chromosomes (diplochromosomes), in the initiation of tumorigenesis has been presented from in vitro experiments. This review uses cellular happenings in benign pre-neoplasia to substantiate this idea, which appears to be linked to the wound-healing process of injured tissue. Rarer association between a wound healing process and a cancer occurrence has long been known. The wound healing multi-program-system involved a phase of tetraploidy that showed diplochromosomes. The hypothesis is that the inflammatory phase may not always be sufficient in getting rid of dead and damaged cells (by apoptosis and autophagy), such that cells with genomic damage (DNA breakage) may survive by genomic repair associated with change to diplochromosomal tetraploidy. In vitro data have shown division of these cells to be an orderly, mechanistic two-step, meiotic-like system, resulting in only two types of progeny cells: 4n/4C/G1 and 2n/2C/G1 pseudo-diploid cells with hyperplastic-like growth-morphology. In vivo damage to tissues can be from many sources for example, physical, toxic environment or from a disease as in Barrett’s esophagus (BE) with acid reflux into the esophagus. For this condition, it is acknowledged that damage of the esophagus lining is a pre-condition to hyperplastic lesions of pre-neoplasia. These initial lesions were from “diploid” propagating cells and, 4n cells with G2 genomic content (no mitosis) accumulated in these lesions before a change to dysplasia. Cell cycle kinetics put these 4n cells in G1, which with S-phase entry would lead to asymmetric tetraploid mitoses, characteristic for dysplastic lesions. This change in hyperplasia to dysplasia is the root-essential condition for a potential progression of pre-neoplasia to cancer. In BE the hyperplastic lesion showed increasing gains of cells with inactivated p53 and p16[ink4a] genes, which destroyed the retinoblastoma (Rb) protein-control over S-phase entry from G1. Rb-protein is a key controller of cycling advancement from G1 (also for normal cells), and is frequently inactivated in tumor cells. Thus in BE, 4n/4C/G1 cells with mutated p53 and p16[ink4a] genes gained cycling ability to tetraploid aneuploid cell cycles, which constituted the change from hyperplasia to dysplastic lesions. In general, such lesions have high predictive value for a cancerous change. Proliferation rates of pre-neoplasia and progression have been shown to be increased by a component of the wound healing program.
文摘目的对2021年采集于我国福建的A组轮状病毒(group A rotavirus,RVA)G3P[8]毒株FJ21351116进行全基因组分子特征分析。方法使用高灵敏度A组轮状病毒全基因组测序方法对FJ21351116进行全基因组测序。用MEGA11.0、Geneious9.0.2和DNASTAR软件通过核酸序列分析评估病毒的基因组特征。使用BioEdit v.7.0.9.0和PyMOL v.2.5.2分析VP7和VP4(VP8*)的中和表位。结果我国福建RVA毒株FJ21351116基因型为G3-P[8]-I2-R2-C2-M2-A2-N2-T2-E2-H2,系统进化分析显示,FJ21351116株的VP7、VP4、VP3、NSP2-NSP5基因与近几年日本检测到的马样DS-1样G3P[8]基因存在亲缘关系。而VP6、VP1、VP2、NSP1基因与大部分国家G2P[4]的相应基因亲缘关系近,特别是新加坡,表明该毒株是马样G3P[8]毒株与G2P[4]毒株共感染过程中通过基因重配形成的。FJ21351116的VP7/VP4基因与Rotarix和RotaTeq疫苗的进化分析表明,VP7和VP4(VP8*)中和抗原表位与疫苗氨基酸位点均存在多个突变。推测Rotarix和RotaTeq疫苗针对马样DS-1样G3P[8]RVA的保护效果不佳,且与Rotarix的中和抗原表位氨基酸差异高于RotaTeq。结论本研究发现一例中国罕见的DS-1样G3P[8]型RVA毒株,且疫苗株可能对其保护效果差,强调了持续监测RVA毒株及研发高效覆盖面全的RVA疫苗的重要性。
