Temperature growth genomes

Comparison of optimal growth temperatures and genomic G-C contents... 

Organism Optimal growth temperature (°C) Genomic G-C content (%) Reference... 

The results summarized in Table 3 show that there is no simple relationship between optimal growth temperature and the G+C content of the genomic DNA. Although... 

No direct relationship exists between the optimal growth temperature of the archaeal thermophiles and their genomic G+C content. However, for the large rRNAs, the G+C content increases directly with optimal growth temperature and, at the highest temperatures, the C content increases relatively more than the G content, which suggests that G-U pairs may be converted to G-C pairs. 

For the open reading frames the G+C content is directly proportional to the genomic G+C content but shows no direct relationship to the optimal growth temperature at high growth temperatures the C content of the open reading frames increases more rapidly than the G content. 

These results are similar to the in vivo data on the effect of growth temperature on the structure and function of ori sequences in the mitochondrial genome of yeast (Goursot et al., 1988 see Part 2). In this case too, increasing temperature from 28°C to 33°C led to the melting of AT stems in the ori sequence of some petite mutants and to the consequent decrease of replicative ability. These results demonstrate direct (reversible) temperature effects on the secondary (and tertiary) structures of DNA and RNA. 

Galtier N. and Lobry J.R. (1997) Relationships between genomic G+C content, RNA secondary structures, and optimal growth temperature in prokaryotes. J. Mol. Evol. 44 632-636. 

Musto H., Naya H., Zavala A., Romero H., Alvarez-Valin F., Bernardi G. (2004). Correlations between genomic GC levels and optional growth temperatures in prokaryotes. FEBS Letters 573 73-77. 

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