Cloning and sequencing of a 16S/23S ribosomal spacer from Haemophilus parainfluenzae reveals an invariant, mosaic-like organisation of sequence blocks.
FEMS Microbiol Lett
; 164(2): 289-94, 1998 Jul 15.
Article
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| MEDLINE
| ID: mdl-9682479
ABSTRACT
A 16S/23S ribosomal spacer from a Haemophilus parainfluenzae rrn locus was cloned and sequenced. Analysis of PCR-amplified genomic fragments showed that this region is strongly conserved among unrelated isolates; computer analysis of database homologies showed that the spacer consists of sequence blocks, arranged in a mosaic-like structure, with strong homologies with analogous blocks present in the spacer regions of Haemophilus influenzae, Haemophilus ducreyi and Actinobacillus spp. It also contains a tRNA(Glu) gene, which is highly homologous to tRNA(Glu) genes found in spacers of other species. These data strongly support the hypothesis that recombination events are involved in the organisation of the sequence of the spacer, as a result of horizontal gene transfer.
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Base de dados:
MEDLINE
Assunto principal:
DNA Ribossômico
/
RNA Ribossômico 16S
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RNA Ribossômico 23S
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Haemophilus
Idioma:
En
Ano de publicação:
1998
Tipo de documento:
Article