A new concept of cell totipotency is formulated, as expressed in plant cells when, by means of a meiotic-like process, they acquire a gametic condition. 展开 关键词: TOTIPOTENCY MITOSIS MEIOSIS CELL CYCLE SOMATIC EMBRYOGENESIS PLANT REGENERATION POLYPLOIDY SOMACLONAL VARIATION ...
Nun RoNCHI V., 1995 -Mitosis and meiosis in cul- tured plant cells and their relationship to variant cell types arising in culture. International Review of Cy- tology, 158: 65-140.Ronchi V. N., 1995 -- Mitosis and meiosis in cultured plant cells and their relationship to variant cell ...
Spatially ordered embryo-like structures self-assembled from blastocyst-derived stem cells can be generated to mimic embryogenesis in vitro. However, the assembly system and developmental potential of such structures needs to be further studied. Here, we devise a nonadherent-suspension-shaking system to...
Retinal progenitor cells at a specific stage of development show competence to produce post- mitotic precursor cells, with the potential for terminal differentiation into a limited subset of retinal cell types, for example, early progenitor cells give rise to ganglion and cone precusor cells, while...
In normal cells, the cell cycle is controlled by a series of signaling pathways by which a cell grows, replicates its DNA and divides. In cancers, as a result of mutations, this regulatory process malfunctions, resulting in uncontrolled cell proliferation that leads to carcinogenesis18,19. From...
The cell cycle lies at the core of cancer16,17. In normal cells, the cell cycle is controlled by a series of signaling pathways by which a cell grows, replicates its DNA and divides. In cancers, as a result of mutations, this regulatory process malfunctions, resulting in uncontrolled cell...
Parthenogenesis is sometimes considered to be an asexual form of reproduction; however, it may be more accurately described as an “incomplete form of sexual reproduction,” since offspring of parthenogenic species develop from gametes. Gametes are reproductive cells that result from meiosis (or redu...
of heredity.) Mutation in the DNA of a body cell of amulticellular organism(somatic mutation) may be transmitted to descendant cells by DNA replication and hence result in a sector or patch of cells having abnormal function, an example beingcancer. Mutations in egg or sperm cells (germinal ...
of themselves usingbinary fissionorbudding. Ineukaryoticorganisms (organisms possessing a cell nucleus) such as humans, all the cells that undergomitosis, such asskincells and cells lining thegastrointestinal tract, areclones; the only exceptions aregametes(eggsandsperm), which undergomeiosisand genetic...
We analyzed and compared the transcriptomes of 4043 cancer and 548 normal tissue samples from 21 TCGA cancer types and created a comprehensive catalog of gene expression alterations for each cancer type. By clustering genes into co-regulated gene sets, we identified seven cross-cancer gene ...