ISSN:
1432-1432
Keywords:
Human genome
;
Dinucleotides
;
Introns
;
II-III codon positions
;
G + C content
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract We have studied the behavior of the dinucleotide preferences under G + C content variation in human genes. The doublet preferences for each dinucleotide were compared between two functionally distinct zones in genes, the II-III codon positions, and the introns. The 16 dinucleotides have been tentatively classified in three groups: AA, AC, CC, CT, and GA, doublets showing no difference between introns and II-III codon positions in the full range of G + C variation TG and TA, which differ in the full range of G + C variation AT, AG, GT, TC, TT, GG, GC, CG, and CA, which show differences in regions over 50% G + C A remarkable pattern observed concerns the behavior of GG, GC, and TC, which showed opposite trends in II-III codon positions and in introns. If codon positions and introns are under the same structural requirements and the same mutational bias, our results indicate that the differences observed could be related to post-transcriptional constraints acting on mRNA.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02407348
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