ISSN:
1432-1432
Keywords:
Genetic code
;
Codon reassignment
;
Codon capture
;
Directional mutation pressure
;
AT/GC pressure
;
Wobble rules
;
Mitochondria
;
Mycoplasma
;
Ciliated protozoa
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary The genetic code, once thought to be “frozen”, show variations from the universal code. Variations are found in mitochondria,Mycoplasma, and ciliated protozoa. The variations results from reassignment of codons, especially stop codons. The ressignments take place by disappearance of a codon from coding sequences, followed by its reappearance in a new role. Simultaneously, a changed anticodon must appear. We discuss the role of directional mutation pressure in the pressure in the events, and we also describe the possibility that such events have taken place during early evolution of the genetic code and can occur during its present evolution.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02103422
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