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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo

Volume 56, Issue 5

Estimation of prokaryote genomic DNA G+C content by sequencing universally conserved genes Free

Abstract

Determination of the DNA G+C content of prokaryotic genomes using traditional methods is time-consuming and results may vary from laboratory to laboratory, depending on the technique used. We explored the possibility of extrapolating the genomic DNA G+C content of prokaryotes from gene sequences. For this, 127 universally conserved genes were studied from 50 prokaryotic genomes in the Clusters of Orthologous Groups database. Of these, 57 genes were present as a single copy in the genomes of 157 different prokaryote species available in GenBank. There was a strong correlation [coefficient of determination ( ) >95 %] between the DNA G+C contents of 20 genes and their corresponding genomes. For each of the 157 prokaryotic genomes studied, the DNA G+C content of the 20 genes was used to determine a ‘calculated’ genome DNA G+C content (CGC) and this value was compared with the ‘real’ genome DNA G+C content (RGC). In order to select the most suitable gene for the determination of CGC values, we compared the and median mol% difference between CGC and RGC as well as the sensitivity of each gene to provide CGC values for prokaryotic genomes that differ by less than 5 mol% from their RGC. The highly conserved gene (median size 1144 nucleotides), a vertically inherited member of the GTPase superfamily, showed the highest value of 0.98, the smallest median mol% difference between CGC and RGC of 1.06 and a sensitivity of 100 %. Using DNA G+C content values, the CGC values of 100 genomes not included in the calculation of differed by less than 5 mol% from their RGC values. These data suggest that the genomic DNA G+C content of prokaryotes may be estimated easily and reliably from the gene sequence.

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Keyword(s): CGC, calculated genome DNA G+C content , GGC, DNA G+C content from each essential single-copy gene and RGC, real genome DNA G+C content
SGM
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2006-05-01
2024-04-25
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Estimation of prokaryote genomic DNA G+C content by sequencing universally conserved genes
Int J Syst Evol Microbiol 56, 1025 (2006); https://doi.org/10.1099/ijs.0.63903-0
/content/journal/ijsem/10.1099/ijs.0.63903-0
/content/journal/ijsem/10.1099/ijs.0.63903-0
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