+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Evolution of the genomic systems of prokaryotes and its momentous consequences

, : Evolution of the genomic systems of prokaryotes and its momentous consequences. International Microbiology 4(2): 67-71

The earliest self-reproducing cell on Earth, our common ancestor, was probably as small as present-day bacteria. It gave rise to a very large and durable clone whose descendants must have been the only living occupants of the oceans for about one thousand million years. They reached astronomical numbers of separate, disjunct cells, and synthesized many new genes. Their small volume could not accommodate ever larger genomes and useful new genes replaced resident, less successful sequences, thus increasing diversity and the number of strains with highly specialized, distinct, bioenergetic potentialities. Also, selective pressure favored strains able to participate successfully in division of labor and in the sharing of diverse abilities in mixed communities, counterbalancing the limited capacities of individual genomes. Lateral gene transfer mechanisms appeared and were progressively improved, furthering the development of diversity. The prokaryotes' constructive evolution resulted in the formation of a worldwide web of genetic information, and a global bacterial superbiosystem (superorganism). By contrast, eukaryotic evolution of organisms has been typically Darwinian. Diversification of eukaryotic organisms was, however, considerably enriched and accelerated by symbioses with prokaryotes. The more broadly diversified bioenergetic potential of prokaryotes considerably increased the diversity of eukaryotes. Without their participation, our biosphere would have remained much less diverse and less dynamic. Environmental homeostasis has been maintained all along by guided bacterial evolution.


PMID: 11770826

DOI: 10.1007/s101230100015

Other references

Dorokhovich, A.; Salomatova, A., 1981: Preparation of egg white for the production of Kievskii cake. Khlebopekarnaia i konditerskaia promyshlennost': (10) 29-30

Rossi, D.; Russo, A.; Manna, E.; Binello, G.; Baldovino, S.; Sciascia, S.; Roccatello, D., 2014: The role of nail-videocapillaroscopy in early diagnosis of scleroderma. Raynaud's phenomenon (RP) is a clinical sign of precocious abnormal microcirculation and can be considered a major risk factor for the development of connective tissue disease, especially systemic sclerosis (SSc). Nailfold videocapillaroscopy...

Pool, T.B.; Martin, J.E., 2001: The production of viable human blastocysts The evolution of sequential culture systems. Wolf, Don P , Zelinski-Wooten, Mary Contemporary Endocrinology Assisted fertilization and nuclear transfer in mammals 137-158

Willis David E., 1968: Seismic noise on the bottom of Lake Superior. Transactions - American Geophysical Union 49(1): 294

Anonymous, 2012: Acute tuberculous meningitis with fulminant fatal evolution in a 69-year-old man. An immunocompetent (HIV-negative) 69-year-old Caucasian man with a history of paramedian pontine acute ischaemic stroke requiring intravenous thrombolysis 1 year earlier (ataxia as sequelae only) was admitted with a 7-day history of fever. The pat...

Carbone, D.; Arata, M.M., 1934: On the mechanism of acquired immunity in plants. Investigations on certain histocytological aspects of plant immunity showed that the defensive reactions of beans when inoculated through wounds with the 'toile' disease organism consisted partly of the ordinary traumatic reactions but w...

Brown, Gk, 1982: Chromosome numbers in Platyschkuhria Rydberg (Compositae) and their systematic significance. American journal of botany 70(4): 591-601

Eggleston Jane R., 1993: Lacustrine sedimentation and origin of the Upper Pennsylvanian Redstone Limestone, Northern Appalachian Basin. Abstracts with Programs - Geological Society of America 25(2): 13

Geneste P.; Raynal M.; Atabek Rosemarie; Dardaine M.; Oliver J., 1990: Characterization of a French clay barrier and outline of the experimental programme. This paper presents the process of ANDRA for the characterization of backfilling materials for a deep radioactive waste disposal in crystalline rocks.

Takenoshita Y.; Ikebe T.; Yamamoto M.; Oka M., 1991: Occlusal contact area and temporomandibular joint symptoms. A new method for quantitative occlusal measurement is presented. In this study occlusal contact areas in 79 patients with or without temporomandibular joint symptoms were assessed from the simple wax bit. The area of occlusion has showed no distin...