The Origin of the Nucleus: The Discovery of a Cellular Fossil
Our archaeological record of evolution is dotted with a few key events, such as life’s emergence from water to land and the emergence of functional wings on birds. However, one of the most fundamental evolutionary changes—the emergence of …
The Nucleus Introduced - PMC - PubMed Central (PMC)
The nucleus was first observed 300 years ago, and research in the past century revealed many of its components. Only recently, however, have we begun to fully appreciate their dynamic, self-organizing behavior.
Evolution of the nucleus - ScienceDirect
2014年6月1日 · Analysis of divergent organisms is essential to fully understand nuclear biology and its origins. The nucleus represents a major evolutionary transition. As a consequence of separating translation from transcription many new functions arose, which likely contributed to the remarkable success of eukaryotic cells.
The Birth of the Nucleus | Science - AAAS
2004年8月6日 · Biologists have long considered the nucleus the driving force behind the complexity of eukaryotic cells. The Scottish botanist Robert Brown discovered it 180 years ago while studying orchids under a microscope. In his original paper, Brown called the novel cellular structure both an areola and a nucleus, but the latter name stuck.
The Origin and Evolution of Cells - The Cell - NCBI Bookshelf
The largest and most prominent organelle of eukaryotic cells is the nucleus, with a diameter of approximately 5 μm. The nucleus contains the genetic information of the cell, which in eukaryotes is organized as linear rather than circular DNA molecules.
Origin of the cell nucleus, mitosis and sex: roles of intracellular ...
2010年2月4日 · Eukaryote cells are all evolutionary chimaeras of an ancestrally phagotrophic host cell with nucleus, endomembranes, and endoskeleton and an enslaved α-proteobacterium converted into a mitochondrion close to the time when the nucleus itself originated, i.e. prior to divergence of any extant eukaryotic lineages (Fig. (Fig.1) 1) .
Origin of the cell nucleus, mitosis and sex: roles of intracellular ...
2010年2月4日 · Here I paint an integrated picture of how the nucleus, sex, and the eukaryotic cell cycle originated and congealed into a novel, unified, and very conservative cellular lifestyle during later stages of the conversion of a bacterium into a eukaryote.
microscope. In his original paper, Brown called the novel cellular structure both an areola and a nucleus, but the latter name stuck. Now, as then, the organelle’s com-plexity inspires awe. The nucleus is a “huge evolutionary novelty,” says Eugene Koonin of the National Center for Biotechnology Information in Bethesda, Maryland.
On the origin of the nucleus: a hypothesis | Microbiology and …
In this hypothesis article, we explore the origin of the eukaryotic nucleus. In doing so, we first look afresh at the nature of this defining feature of the eukaryotic cell and its core functions—emphasizing the utility of seeing the eukaryotic nucleoplasm and cytoplasm as distinct regions of a common compartment.
Evolutionary origin of the cell nucleus and its functional ... - PubMed
2010年9月20日 · We start this chapter with a survey of current hypotheses on the evolutionary origin of the cell nucleus. Thereafter, we provide an overview of evolutionarily conserved features of chromatin organization and arrangements, as well as topographical aspects of DNA replication and transcription, followed by a brief introduction of current models of ...