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. 1987 Jul 24;15(14):5729–5737. doi: 10.1093/nar/15.14.5729

CpG and TpA frequencies in the plant system.

M Boudraa, P Perrin
PMCID: PMC306018  PMID: 3497385

Abstract

Higher plant nuclear sequences reveal avoidance of CpG and TpA doublets. Chloroplast sequences avoid the TpA doublet in all codon positions. The chloroplast genome is not methylated but codon positions II-III and untranslated regions avoid CpG. The mitochondrial genome, also unmethylated, avoids CpG in all codon positions. We therefore deduce that methylation is not sufficient to explain CpG avoidance in the higher plant systems. Other factors must be taken into account such as amino acid composition, codon choices and perhaps stability of the DNA helix.

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Selected References

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