How does current theory explain the origin of a nucleus in eukaryotic cells?
|
Show Virtually all the life we see each day — including plants and animals — belongs to the third domain, Eukaryota. Eukaryotic cells are more complex than prokaryotes, and the DNA is linear and found within a nucleus. Eukaryotic cells boast their own personal “power plants”, called mitochondria. These tiny organelles in the cell not only produce chemical energy, but also hold the key to understanding the evolution of the eukaryotic cell. The complex eukaryotic cell ushered in a whole new era for life on Earth, because these cells evolved into multicellular organisms. But how did the eukaryotic cell itself evolve? How did a humble bacterium make this evolutionary leap from a simple prokaryotic cell to a more complex eukaryotic cell? The answer seems to be symbiosis — in other words, teamwork. Evidence supports the idea that eukaryotic cells are actually the descendents of separate prokaryotic cells that joined together in a symbiotic union. In fact, the mitochondrion itself seems to be the “great-great-great-great-great-great-great-great-great granddaughter” of a free-living bacterium that was engulfed by another cell, perhaps as a meal, and ended up staying as a sort of permanent houseguest. The host cell profited from the chemical energy the mitochondrion produced, and the mitochondrion benefited from the protected, nutrient-rich environment surrounding it. This kind of “internal” symbiosis — one organism taking up permanent residence inside another and eventually evolving into a single lineage — is called endosymbiosis. Recommended textbook solutions
Clinical Reasoning Cases in Nursing7th EditionJulie S Snyder, Mariann M Harding 2,512 solutions
Hole's Human Anatomy and Physiology13th EditionDavid N. Shier, Jackie L. Butler, Ricki Lewis 1,402 solutions  Biology1st EditionKenneth R. Miller, Levine 2,591 solutions Human Anatomy and Physiology Laboratory Manual11th EditionElaine N. Marieb, Lori A. Smith, Susan J. Mitchell 176 solutions As a fundamental unit of life, the cell is central to all of biology. Better understanding how complex cells evolved and work promises new revelations in areas as diverse as cancer research and developing new crop plants. But deep thinking on how the eukaryotic cell came to be is astonishingly scant. Now, however, a bold new idea of how the eukaryotic cell and, by extension, all complex life came to be is giving scientists an opportunity to re-examine some of biology’s key dogma. All complex life — including plants, animals and fungi — is made up of eukaryotic cells, cells with a nucleus and other complex internal machinery used to perform the functions an organism needs to stay alive and healthy. Humans, for example, are composed of 220 different kinds of eukaryotic cells — which, working in groups, control everything from thinking and locomotion to reproduction and immune defense. David Baum Thus, the origin of the eukaryotic cell is considered one of the most critical evolutionary events in the history of life on Earth. Had it not occurred sometime between 1.6 and 2 billion years ago, our planet would be a far different place, populated entirely by prokaryotes, single-celled organisms such as bacteria and archaea. For the most part, scientists agree that eukaryotic cells arose from a symbiotic relationship between bacteria and archaea. Archaea — which are similar to bacteria but have many molecular differences — and bacteria represent two of life’s three great domains. The third is represented by eukaryotes, organisms composed of the more complex eukaryotic cells. Eukaryotic cells are characterized by an elaborate inner architecture. This includes, among other things, the cell nucleus, where genetic information in the form of DNA is housed within a double membrane; mitochondria, membrane-bound organelles, which provide the chemical energy a cell needs to function; and the endomembrane system, which is responsible for ferrying proteins and lipids about the cell. Prevailing theory holds that eukaryotes came to be when a bacterium was swallowed by an archaeon. The engulfed bacterium, the theory holds, gave rise to mitochondria, whereas internalized pieces of the outer cell membrane of the archaeon formed the cell’s other internal compartments, including the nucleus and endomembrane system. “The current theory is widely accepted, but I would not say it is ‘established’ since nobody seems to have seriously considered alternative explanations,” explains David Baum, a University of Wisconsin–Madison professor of botany and evolutionary biologist who, with his cousin, University College London cell biologist Buzz Baum, has formulated a new theory for how eukaryotic cells evolved. Known as the “inside-out” theory of eukaryotic cell evolution, the alternative view of how complex life came to be was published recently (Oct. 28, 2014) in the open access journal BMC Biology. The inside-out theory proposed by the Baums suggests that eukaryotes evolved gradually as cell protrusions, called blebs, reached out to trap free-living mitochondria-like bacteria. Drawing energy from the trapped bacteria and using bacterial lipids — insoluble organic fatty acids — as building material, the blebs grew larger, eventually engulfing the bacteria and creating the membrane structures that form the cell’s internal compartment boundaries. “The idea is tremendously simple,” says David Baum, who first began thinking about an alternate theory to explain the rise of the eukaryotic cell as an Oxford University undergraduate 30 years ago. “It is a radical rethinking, taking what we thought we knew (about the cell) and turning it inside-out.” From time to time, David Baum dusted off his rudimentary idea and shared it with others, including the late Lynn Margulis, the American scientist who developed the theory of the origin of eukaryotic organelles. Over the past year, Buzz and David Baum refined and detailed their idea, which, like any good theory, makes predictions that are testable. “First, the inside-out idea immediately suggested a steady stepwise path of evolution that required few cellular or molecular innovations. This is just what is required of an evolutionary model,” argues Buzz Baum, an expert on cell shape and structure. “Second, the model suggested a new way of looking at modern cells.” “The current theory is widely accepted, but I would not say it is ‘established’ since nobody seems to have seriously considered alternative explanations.” David Baum Modern eukaryotic cells, says Buzz Baum, can be interrogated in the context of the new theory to answer many of their unexplained features, including why nuclear events appear to be inherited from archaea while other features seem to be derived from the bacteria. “It is refreshing to see people thinking about the cell holistically and based on how cells and organisms evolved,” says Ahna Skop, a UW–Madison professor of genetics and an expert on cell division. The idea is “logical and well thought out. I’ve already sent the paper to every cell biologist I know. It simply makes sense to be thinking about the cell and its contents in the context of where they may have come from.” The way cells work when they divide, she notes, requires the interplay of molecules that have evolved over many millions of years to cut cells in two in the process of cell division. The same molecular functions, she argues, could be repurposed in a way that conforms to the theory advanced by the Baums. “Why spend the energy to remake something that was made thousands of years ago to pinch in a cell? The functions of these proteins just evolve and change as the organism’s structure and function change.” Knowing more about how the eukaryotic cell came to be promises to aid biologists studying the fundamental properties of the cell, which, in turn, could one day fuel a better understanding of things like cancer, diabetes and other cell-based diseases; aging; and the development of valuable new traits for important crop plants. “I have no idea if it is right or wrong, but they’ve done a good job of pulling in detail and providing testable hypotheses. That, in itself, is incredibly useful.” Judith Kimble One catch for fleshing out the evolutionary history of the eukaryotic cell, however, is that unlike many other areas of biology, the fossil record is of little help. “When it comes to individual cells, the fossil record is rarely very helpful,” explains David Baum. “It is even hard to tell a eukaryotic cell from a prokaryotic cell. I did look for evidence of microfossils with protrusions, but, not surprisingly, there were no good candidates.” A potentially more fruitful avenue to explore, he suggests, would be to look for intermediate forms of cells with some, but not all, of the features of a full-blown eukaryote. “The implication is that intermediates that did exist went extinct, most likely because of competition with fully-developed eukaryotes.” However, with a more granular understanding of how complex cells evolved, it may be possible to identify living intermediates, says David Baum: “I do hold out hope that once we figure out how the eukaryotic tree is rooted, we might find a few eukaryotes that have intermediate traits.” “This is a whole new take (on the eukaryotic cell), which I find fascinating,” notes UW–Madison biochemistry Professor Judith Kimble. “I have no idea if it is right or wrong, but they’ve done a good job of pulling in detail and providing testable hypotheses. That, in itself, is incredibly useful.” How did the nucleus of eukaryotic cells originate?Recently, Horiike et al. (1) proposed that the eukaryotic nucleus was derived from the symbiosis of Archaea in Bacteria. Their results were based on a search for homologies between proteins found in the yeast genome and those found in the genomes of Archaea and Bacteria.
What is our current understanding of the evolution of eukaryotic cells?Eukaryotic cells probably evolved about 2 billion years ago. Their evolution is explained by the endosymbiotic theory. The widely accepted Endosymbiotic Theory explains the origin of eukaryotic cells as a merging of several kinds of prokaryotic cells.
What theory is used to describe the origin of some eukaryotic organelles?The endosymbiotic theory posits that some eukaryotic cell organelles, such as mitochondria and plastids, evolved from free-living prokaryotes. Available data indicate that the mitochondrial endosymbiosis initiated the evolution of the eukaryotic cell, as suggested by Margulis.
How does the endosymbiotic theory explain eukaryotic cell structure?Explanation: The Endosymbiotic Theory states that the mitochondria and chloroplast in eukaryotic cells were once aerobic bacteria (prokaryote) that were ingested by a large anaerobic bacteria (prokaryote). This theory explains the origin of eukaryotic cells.
|
