DNA sequence heterogeneity in the three copies of the long 16S–23S rDNA spacer of Enterococcus faecalis isolates

Abstract

The possibility of intragenic heterogeneity between copies of the long intergenic (16S-23S rDNA) spacer region (LISR) was investigated by specific amplification of this region from 21 Enterococcus faecalis isolates. Three copies of the LISR (rrnA, B and C) were demonstrated by hybridization of the LISR to genomic DNA cleaved with I-Ceul and SmaI. When the LISR amplicon was digested with Tsp509I, two known nucleotide substitutions were detected, one 4 nt upstream from the 5' end of the tRNA(ala) gene (allele rrnB has the Tsp509I site and rrnA and C do not) and the other 22 nt downstream from the 3' end of the tRNA(ala) gene (rrnC has the Tsp509I site). Sequence differences at these sites were detected at the allelic level (alleles rrnA, B and C) and different combinations of these alleles were designated Tsp Types. Using densitometry to analyse bands from electrophoresis gels, the intra-isolate ratios of the separate alleles (rrnA:rrnB:rrnC) were determined in each Tsp Type: I (0:3:0), II (1:2:0), III (2:0:1), IV (3:0:0), V (2:1:0) and VI (1:1:1). Sequence variation between the three copies of the LISR was confirmed by the detection of at least five other intra-isolate nucleotide substitutions using heteroduplex analysis by conformation-sensitive gel electrophoresis (CSGE) that were not detected by Tsp509I cleavage. Perpendicular denaturing gradient gel electrophoresis was capable of resolving homoduplexes; six to seven out of a possible nine curves were obtained in some isolates. In the isolate where seven curves were obtained one or more further nucleotide substitutions, not detected by Tsp509I cleavage or CSGE, were detected. On the basis of LISR sequence heterogeneity, isolates were categorized into homogeneous (only one allele sequence present) and heterogeneous (two or three allele sequences present). The transition between homogeneous and heterogeneous LISRs may be useful in studying evolutionary mechanisms between E. faecalis isolates.